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GST Health Check & Risk Assessment

A GST Health Check is the review most businesses only think of after a notice arrives.

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A GST Health Check is the review most businesses only think of after a notice arrives. By then, interest is running, input tax credit is under question, and the officer's assessment window is already open. At PNPC Global, we run a systematic, ledger-to-return, return-to-books reconciliation across every GST filing you have made — GSTR-1, GSTR-3B, GSTR-2B, GSTR-9/9C, e-way bills, and e-invoices — to surface mismatches, reversed credit, blocked ITC, RCM gaps, and classification errors before the department finds them first. We have supported businesses through every GST notification cascade since the regime launched in 2017, including the September 2025 rate rationalisation. A health check is not a compliance formality — it is the difference between walking into an audit or scrutiny notice with answers already prepared, or scrambling to reconstruct two years of records under a 15-day statutory deadline.

What it costs

Govt. feesGovernment & statutory fees as applicable to your case
Professional feeFixed professional fee — confirmed in writing before we start

No hidden charges. The exact figure is set in your engagement letter.

What GST Health Check & Risk Assessment is

A GST Health Check (also called a GST diagnostic review or GST compliance audit) is a structured, independent examination of a business's GST records, returns, and underlying transactions to identify risk areas before they surface as departmental notices, interest demands, or blocked input tax credit. Unlike the mandatory GST Audit under Section 35(5)/44 of the CGST Act 2017 (which, since the Finance Act 2021 amendment, is now a self-certified reconciliation via GSTR-9C rather than a mandatory CA-certified audit above ₹5 crore turnover), a health check is a voluntary, proactive engagement that PNPC conducts on a periodic basis — typically annually, or before a funding round, M&A due diligence, or departmental audit notice. It examines the same underlying data a GST officer would examine during a scrutiny (Section 61), audit (Section 65), or special audit (Section 66) — but from the taxpayer's side, with the objective of finding and fixing issues before the department does.

The review methodology reconciles four independent data sources that, in a properly compliant business, should agree with each other but frequently do not: the sales register and books of account; GSTR-1 (outward supply return, invoice-level); GSTR-3B (summary return on which tax is actually paid); and GSTR-2B (auto-populated statement of eligible input tax credit generated from suppliers' GSTR-1/IFF filings). Mismatches between these four sources are the single largest source of GST notices in India today — a GSTR-1 vs GSTR-3B mismatch (Form ASMT-10 scrutiny trigger), a GSTR-3B vs GSTR-2B ITC mismatch (Rule 36(4) and Section 16(2)(aa) restriction on availing credit not reflected in GSTR-2B), or a GSTR-9 vs GSTR-9C mismatch at annual reconciliation. PNPC's health check runs a line-by-line reconciliation across all four, flags every variance above a materiality threshold, and traces each one back to its root cause — a wrongly classified supply, a vendor who has not filed their own GSTR-1, a credit note not reflected, or a genuine data entry error.

Beyond reconciliation, the health check evaluates classification and rate risk. Following the GST Council's rate rationalisation effective 22 September 2025, the GST rate structure moved from the earlier four-slab system (5%/12%/18%/28%) to a simplified 5%/18%/40% structure, with the 40% de-merit rate applying to a narrow list of sin/luxury goods and most items that were earlier at 12% or 28% now sitting at either 5% or 18%. A health check verifies that every HSN/SAC code in use reflects the post-rationalisation rate correctly, that no invoices are still being raised at a stale pre-September-2025 rate, and that transitional stock and contracts spanning the rate-change date have been handled per the applicable transition provisions. The review also checks reverse-charge mechanism (RCM) compliance — payments to unregistered suppliers, goods transport agencies, and specified categories under Section 9(3)/9(4) — a frequently under-deducted liability that compounds with interest the longer it goes unnoticed.

Finally, the health check produces a structured risk register: every finding is categorised by exposure value, statutory provision, and urgency (immediate correction via amendment/DRC-03 voluntary payment, correction in the next return cycle, or process fix going forward). This risk register becomes the working paper for any subsequent departmental audit, GSTR-9C reconciliation, or investor/acquirer due diligence — the same document serves multiple purposes rather than being a one-time report that sits unused. For businesses approaching a funding round, an M&A transaction, or simply the annual GSTR-9/9C filing season, a health check converts GST compliance from a reactive, notice-driven exercise into a managed, documented function.

When a GST Health Check delivers real value

Before the annual GSTR-9 (Annual Return) and GSTR-9C (self-certified reconciliation statement) filing — reconciling books-to-returns before the annual filing catches issues while they are still correctable through amendment, not after the return is locked

After receiving any departmental communication — even an informal query, ASMT-10 scrutiny notice, or a summons — a health check prepares a complete, defensible response before the statutory reply deadline

Before a funding round, M&A transaction, or investor due diligence — GST exposure is a standard due diligence line item, and undisclosed liabilities discovered during diligence routinely trigger valuation adjustments or deal delays

Following the September 2025 GST rate rationalisation (5%/18%/40% structure) — verifying every HSN/SAC code and invoice template reflects the correct post-rationalisation rate, and that no legacy 12%/28% rates are still being charged

When your business has grown rapidly — new states, new product lines, new e-commerce channels, or crossing the e-invoicing turnover threshold — since each expansion creates new classification, registration, and reconciliation risk that legacy processes may not have caught

When your accounting team has changed, or GST return filing has been outsourced to multiple parties over time — continuity gaps between different preparers are a common source of undetected mismatches

Before voluntarily availing or reversing input tax credit on a large capital purchase, import, or intercompany transaction — where the ITC eligibility rules under Section 16/17 and the blocked credit list under Section 17(5) are frequently misapplied

If your GSTR-2B has consistently shown a gap against GSTR-3B ITC claimed — indicating either vendor non-compliance (they have not filed their GSTR-1) or an internal claim of credit not actually reflected, both of which carry Section 16(2)(aa) exposure

When e-way bill and e-invoice data shows discrepancies against GSTR-1 outward supply values — a common trigger for transporter-level and consignment-level GST department scrutiny

As a standing annual discipline for any business above ₹5 crore turnover — at this scale, manual reconciliation errors compound, and the absolute value of even a small percentage mismatch becomes material

When your business operates across multiple GSTINs (multi-state registration) — cross-charge, Input Service Distributor (ISD) allocation, and stock transfer valuation between distinct persons under Schedule I are recurring risk areas

When a full health check may be premature

Newly registered businesses with fewer than 2–3 months of live GST filings — there is not yet enough return history to reconcile meaningfully; a lighter process-setup review is more appropriate at this stage

Very small businesses under the Composition Scheme with negligible transaction volume and no ITC claims — the reconciliation risk surface is inherently smaller, though a periodic lighter-touch review is still worthwhile

Businesses that already have a dedicated in-house GST compliance function performing monthly three-way reconciliation (books, GSTR-1, GSTR-3B/2B) as standard practice — an external health check adds most value as an independent second check, typically annually, rather than duplicating monthly work already being done correctly

As a substitute for the statutory GSTR-9C self-certification itself — a health check is a diagnostic and preparatory exercise; where turnover crosses the applicable GSTR-9C threshold, the self-certified reconciliation statement remains a separate mandatory filing obligation

Immediately after a health check has already been completed within the same financial year with no material change in business operations — repeating the full exercise within the same period adds cost without proportionate new findings; a lighter follow-up review of the specific flagged items is more efficient

As a way to retroactively legitimise a position the business already knows is non-compliant without any intention to correct it — a health check is only valuable when its findings are acted upon; PNPC's engagement includes a remediation plan, not just a findings report

Structure Comparison

GST Health Check vs other related GST assurance engagements

FeatureGST Health Check (PNPC)Statutory GSTR-9C ReconciliationDepartmental GST Audit (Sec 65)Special Audit (Sec 66)Internal Bookkeeping Review
TriggerVoluntary — proactive, PNPC-initiated or client-requestedMandatory self-certification above the applicable turnover threshold, filed with GSTR-9Officer-initiated; department selects taxpayer for auditOfficer-initiated during assessment/scrutiny, with Commissioner's approval, for complex valuation or ITC mattersRoutine internal accounting review — not GST-specific
Who performs itPNPC's GST practice teamTaxpayer, self-certified (post Finance Act 2021 — no longer mandatorily CA/CMA-certified)Departmental GST officer or authorised officerA CA or Cost Accountant nominated by the CommissionerIn-house accounts team or outsourced bookkeeper
ScopeFull reconciliation: books vs GSTR-1 vs GSTR-3B vs GSTR-2B, rate/HSN review, RCM check, ITC eligibility, e-way bill/e-invoice tie-outTurnover and tax reconciliation between audited financials and annual returnBooks of account, returns, and records for the audit period as notifiedSpecific transactions or valuation aspects referred by the officerGeneral ledger accuracy — not focused on GST-specific compliance risk
OutputRisk register with findings, exposure value, statutory basis, and remediation planReconciliation statement (GSTR-9C) filed on the GST portalAudit findings communicated via ADT-16 and demand notice if discrepancies foundSpecial audit report submitted to the officer, binding on assessmentInternal management letter or review notes
Legal consequence of findingsNone directly — findings are advisory; client decides on voluntary correction via DRC-03Discrepancies can trigger a Section 73/74 demand noticeCan result in demand under Section 73 (no fraud) or Section 74 (fraud/suppression), with interest and penaltyCan result in demand with recovery proceedings; audit cost borne by the taxable person in some casesNo direct legal consequence
TimingAny time — most valuable pre-filing, pre-notice, or pre-transactionAnnual, alongside GSTR-9 for the relevant financial yearAs selected by the department, typically covering a financial year at a timeAs directed during ongoing assessment or scrutiny proceedingsOngoing / periodic, management-driven
Best used forPreventing issues from becoming notices; due diligence readiness; annual disciplineStatutory compliance obligationResponding to and managing an active departmental auditResponding to a specific valuation or ITC dispute raised during assessmentGeneral financial reporting accuracy

A GST Health Check does not replace any statutory filing or departmental process — it is a preparatory, risk-identification exercise that materially improves the outcome of all the processes listed alongside it. Applicability of GSTR-9C and the specific turnover thresholds should always be confirmed for your business's current financial year, since these thresholds have been revised by CBIC notification in the past and may be revised again.

How it works
#Stage & What PNPC DoesCA Advice Portals Never GiveTimeline
1Scoping Call — Understanding your business, GSTIN footprint, and risk appetiteWe ask what generic compliance vendors never ask: how many GSTINs do you operate, do you have intercompany transactions requiring cross-charge, have you changed accounting software or GST filing preparers recently, do you sell through e-commerce operators liable for TCS, and has your product mix or HSN classification changed since the September 2025 rate rationalisation. These answers determine the depth and priority order of the health check.Day 1
2Data Collection — Books, returns, and reconciliation source documentsWe request the full data set: sales and purchase registers, GSTR-1, GSTR-3B, GSTR-2A/2B, GSTR-9/9C (if previously filed), e-way bill reports, e-invoice IRN reports, RCM payment records, and ITC ledger extracts from the GST portal — typically for the past 2–3 financial years or since last reviewed, whichever is shorter.Day 2–5
3Books-to-GSTR-1 Reconciliation — Outward supply verificationWe match every invoice in your sales register against GSTR-1 filings, line by line where volume permits or on a sampling basis with statistical coverage for high-volume businesses. Mismatches are traced to root cause: missed invoices, duplicate reporting, wrong GSTIN of recipient, wrong place-of-supply determination (which affects whether CGST+SGST or IGST applies), or credit notes not reported.Day 5–10
4GSTR-1 vs GSTR-3B Reconciliation — Liability verificationGSTR-1 (invoice-level detail) and GSTR-3B (summary payment) are filed separately and frequently diverge — a common ASMT-10 scrutiny trigger. We reconcile total taxable value and tax liability declared in each, flag variances above materiality, and prepare the explanation memo before any officer query arrives.Day 8–12
5GSTR-3B vs GSTR-2B ITC Reconciliation — Input tax credit verificationWe verify that ITC claimed in GSTR-3B is actually reflected in GSTR-2B, per the restriction under Rule 36(4) and Section 16(2)(aa). Credit claimed but not reflected in GSTR-2B is a direct exposure — it may need reversal with interest, or requires chasing the specific vendor to file their own GSTR-1. We produce a vendor-wise gap list so your team can follow up with non-compliant suppliers.Day 10–15
6Rate & HSN/SAC Classification Review — Post rate-rationalisation accuracy checkSince the GST Council's rate rationalisation effective 22 September 2025 moved the structure to 5%/18%/40%, we verify every HSN/SAC code and invoice template in use reflects the correct current rate, that no invoices are still being generated at a stale pre-rationalisation rate (5%/12%/18%/28%), and that any transitional-period contracts or stock have been treated per the applicable transition rule.Day 12–18
7Reverse Charge Mechanism (RCM) Review — Under-deducted liability checkWe review payments to unregistered suppliers, goods transport agencies (GTA), legal services, sponsorship, and other categories notified under Section 9(3)/9(4) for RCM applicability, and verify RCM tax was actually paid (not merely accrued) and the corresponding ITC correctly claimed in a later period, not the same period as payment.Day 15–20
8Blocked Credit (Section 17(5)) ReviewWe check ITC claimed on categories specifically blocked under Section 17(5) — motor vehicles (with narrow exceptions), employee-related benefits like health insurance and club memberships (unless statutorily obligatory or output-taxed), works contract services for immovable property (with exceptions), and goods lost, stolen, or given as gifts/samples. Wrongly claimed blocked credit is one of the most common findings in departmental audits.Day 18–22
9E-Way Bill & E-Invoice Tie-OutFor businesses above the applicable e-invoicing turnover threshold, we verify Invoice Reference Numbers (IRNs) generated match GSTR-1 outward supply values, and that e-way bills generated for goods movement reconcile with actual invoiced values — discrepancies here are a common trigger for transporter and consignment-level scrutiny at check-posts and during audit.Day 20–25
10Annual Return Cross-Check — GSTR-9 / GSTR-9C readinessWhere GSTR-9 has already been filed, we verify it against the underlying GSTR-1/3B data; where it is yet to be filed, our reconciliation becomes the working paper for an accurate GSTR-9 and (where applicable) GSTR-9C self-certification, materially reducing the risk of a mismatch-triggered demand notice later.Day 22–28
11Risk Register & Findings ReportEvery finding is documented with: the specific transaction or period affected, the statutory provision involved, the estimated exposure value (tax + interest, calculated using the applicable rate), and a recommended remediation path — voluntary payment via DRC-03, return amendment in the next available cycle, or a forward-looking process fix. Findings are prioritised by exposure value and urgency, not listed in arbitrary order.Day 26–30
12Remediation Support — Acting on the findingsFor findings the client chooses to correct voluntarily, we prepare the DRC-03 voluntary payment computation (tax + applicable interest under Section 50), draft the return amendments within the permissible amendment window, and document the correction for the audit trail — since a documented voluntary correction is treated far more favourably than the same error discovered by an officer.Ongoing, as agreed

Typical health check turnaround is 3–5 weeks for a single-GSTIN business with 2 years of return history; multi-state businesses with several GSTINs or high transaction volume take longer and are typically scoped and quoted individually. The exact depth (full line-by-line vs statistically sampled review) is agreed with the client at the scoping stage based on transaction volume and risk appetite.

Document Checklist
GST Registration & Return Data

GSTIN certificate(s) — for every state in which the business is registered

GSTR-1 filings — for the period under review, typically the past 2–3 financial years

GSTR-3B filings — for the same period, to reconcile against GSTR-1 and books

GSTR-2A/2B statements downloaded from the GST portal — to verify actual ITC eligibility as reflected by vendor filings

GSTR-9 (Annual Return) — if previously filed for any of the years under review

GSTR-9C (Reconciliation Statement) — if previously filed or applicable for the current year based on turnover

Any previous departmental notices, ASMT-10 scrutiny communications, audit memos, or show-cause notices — even if already responded to, since recurring findings indicate a systemic issue

Books of Account & Registers

Sales register / outward supply register with invoice-level detail — invoice number, date, customer GSTIN, taxable value, tax rate, and tax amount

Purchase register / inward supply register with the same level of detail for vendor invoices

General ledger and trial balance for the period under review, to reconcile revenue recognised in books against outward supply value declared in GST returns

Credit note and debit note register — a frequent source of GSTR-1 vs books mismatch when not correctly linked to the original invoice

Fixed asset register — relevant for verifying capital goods ITC claims and any reversal obligations on disposal or change of use

Stock register, if the business deals in goods — relevant for verifying e-way bill accuracy and stock transfer valuation between distinct persons

Input Tax Credit & RCM Records

ITC ledger as reflected on the GST portal (Electronic Credit Ledger) — to reconcile against ITC claimed in GSTR-3B

Vendor invoices supporting ITC claims — particularly for high-value claims, capital goods, and any items in categories close to the Section 17(5) blocked-credit boundary

Reverse charge mechanism payment records — for goods transport agency (GTA) payments, legal services, import of services, and any other RCM-notified category applicable to the business

Import documents (Bill of Entry) where IGST paid on imports is being claimed as ITC

Input Service Distributor (ISD) invoices and allocation records, if the business operates an ISD registration for cross-charge of common input services across GSTINs

E-Invoicing & E-Way Bill Data

E-invoice (IRN) generation reports, for businesses above the applicable e-invoicing turnover threshold — to tie against GSTR-1 outward supply data

E-way bill reports for goods movement during the period under review

Transporter and delivery challan records where goods movement occurs without a tax invoice (e.g., job work, stock transfer)

HSN/SAC & Rate Documentation

Current HSN/SAC code master list used in invoicing and accounting software, mapped to product/service lines

Rate card or price list showing GST rates applied, particularly for any item whose classification or rate may have shifted under the September 2025 rate rationalisation

Any advance rulings, departmental clarifications, or classification opinions previously obtained for ambiguous product/service categories

Corporate & Business Context

List of all GSTINs held by the business (including any group companies with intercompany transactions requiring cross-charge review)

Organisation chart identifying who currently prepares and files GST returns, and any changes in preparer or software during the review period

Details of e-commerce platforms used for sales (if any) and TCS credit reconciliation status under Section 52

Any planned corporate action — fundraise, M&A, restructuring — that makes the health check time-sensitive, so PNPC can prioritise the relevant scope accordingly

Ongoing obligations
PhaseTriggered ByPNPC CA GuidanceRisk If Ignored
Scoping & Data Gathering (Week 1)Engagement kick-offBusiness and GSTIN footprint mapped. Data request list issued and tracked. Prior notices and past reconciliation gaps reviewed for context before deep-dive work begins.Health check scoped too narrowly misses high-risk areas specific to the business — e.g., a multi-state business reviewed as if single-state.
Reconciliation (Week 1–4)Data receivedBooks-to-GSTR-1, GSTR-1-to-GSTR-3B, and GSTR-3B-to-GSTR-2B reconciliation performed systematically. Every variance traced to a specific root cause rather than left as an unexplained number.Undetected mismatches remain latent until a departmental scrutiny (ASMT-10) or audit surfaces them — typically years later, with accumulated interest and, in fraud/suppression cases, penalty up to 100% or 200% of tax under Section 74.
Classification & Rate ReviewPost-reconciliation deep diveHSN/SAC codes and invoice rate templates checked against the current GST rate structure, including the September 2025 rate rationalisation. Any legacy stale-rate invoices identified for correction.Charging the wrong rate under-collects tax (a liability the seller must still make good, often without ability to recover it from the customer after the fact) or over-collects tax (a customer relations and refund-process issue).
RCM & Blocked Credit ReviewPost-reconciliation deep diveReverse charge liability under Section 9(3)/9(4) verified as actually paid, not merely accrued. ITC claims checked against the Section 17(5) blocked-credit list.Unpaid RCM liability accrues interest at 18% per annum from the original due date. Wrongly claimed blocked credit, once identified by the department, is recovered with interest and can attract penalty.
Findings & Risk RegisterReconciliation completeEvery finding documented with statutory basis, exposure value, and recommended remediation path — prioritised by materiality so management can act on the highest-value items first.A findings list without prioritisation or remediation guidance sits unused — the health check becomes a compliance-theatre exercise rather than a risk-reduction one.
Voluntary RemediationClient decision to correctDRC-03 voluntary payment computed with correct interest calculation under Section 50. Return amendments prepared within the permissible window. Correction documented for the audit trail.A finding left uncorrected, if later discovered by the department during scrutiny or audit, is typically treated as a suppression matter under Section 74 rather than a bona fide error under Section 73 — with materially higher penalty exposure.
Annual Repeat / Trigger-Based ReviewNext financial year-end, or a fundraise/M&A eventHealth check repeated annually as standing discipline, or specifically ahead of a funding round, acquisition, or GSTR-9C filing — each time building on the previous year's risk register so recurring issues are visibly tracked to closure.Without a repeat discipline, process fixes agreed after the first health check are not verified — the same mismatches can silently recur in the following year's filings.
Frequently asked
What exactly is a GST Health Check, in plain terms?

It is a structured review of your GST returns, books, and underlying transactions — conducted by PNPC, not the GST department — to find mismatches, wrongly claimed credit, missed reverse-charge liability, and classification errors before they turn into a departmental notice. Think of it as a proactive audit you commission yourself, on your own timeline, so that any issue found can be corrected voluntarily and on more favourable terms than if the department finds it first.

Practitioner noteThe single biggest value of a health check is timing. The exact same finding — say, ₹3 lakh of wrongly claimed ITC — costs far less to fix voluntarily via DRC-03 than it does after a Section 74 show-cause notice with suppression allegations attached.
Is a GST Health Check the same as the mandatory GST Audit?

No, and this distinction matters. The earlier mandatory CA/CMA-certified GST Audit under Section 35(5) for businesses above ₹2 crore turnover was removed by the Finance Act 2021 — annual reconciliation is now a self-certified GSTR-9C filed by the taxpayer above the applicable turnover threshold, without mandatory third-party certification. A PNPC Health Check is a separate, voluntary engagement that goes deeper than the minimum needed for GSTR-9C self-certification — it is designed to find and fix problems, not just to produce the statutory reconciliation number.

Practitioner noteMany businesses still believe a CA-certified GST audit is mandatory above ₹2 crore turnover. That requirement was removed years ago. We still recommend an independent health check at this scale — but for risk-management reasons, not because the law requires third-party sign-off anymore.
How often should a business get a GST Health Check done?

Annually is the standard recommendation for most businesses above roughly ₹5 crore turnover, timed to precede the GSTR-9/9C filing season. Businesses below that threshold, with simpler operations and fewer transactions, can often do a lighter review every 18–24 months. Certain events should always trigger an out-of-cycle health check regardless of the last review date: a departmental notice of any kind, a planned fundraise or M&A transaction, a major change in accounting software or GST filing personnel, or a significant business expansion into new states or product lines.

Practitioner noteWe tell clients to think of it like a health screening — the annual routine check catches most things early, but certain life events (in this case, business events) warrant an immediate check regardless of when the last one happened.
What is the difference between GSTR-2A and GSTR-2B, and why does it matter for the health check?

GSTR-2A is a dynamic, real-time statement that updates continuously as suppliers file their returns. GSTR-2B is a static, monthly-generated statement that locks the ITC position as of a specific cut-off date each month and is the statement actually used to determine eligible ITC under Rule 36(4) and Section 16(2)(aa). A health check reconciles GSTR-3B ITC claims against GSTR-2B specifically — not GSTR-2A — because GSTR-2B is the legally relevant reference point for ITC eligibility.

Practitioner noteWe still see businesses reconciling against GSTR-2A out of habit from the pre-2021 process. It gives a different, often more favourable-looking number than GSTR-2B — which means the reconciliation is checking against the wrong benchmark and can miss a real exposure.
What happens if my GSTR-3B ITC claim doesn't match GSTR-2B?

Since the insertion of Section 16(2)(aa) and Rule 36(4), a registered person can generally avail input tax credit only to the extent it is reflected in their GSTR-2B — credit claimed beyond what GSTR-2B shows is at risk of being treated as ineligible, inviting interest and potential reversal. In our health check, every mismatch is traced to its cause: sometimes it is the vendor's fault (they have not filed their GSTR-1 or filed it late), and sometimes it is an internal timing or data-entry issue on the recipient's side.

Practitioner noteA vendor-wise gap list is one of the most actionable outputs of a health check — it tells your accounts payable team exactly which suppliers to chase before the credit is permanently lost or attracts a demand.
Does the September 2025 GST rate rationalisation affect my past filings?

The rate rationalisation effective 22 September 2025 moved the GST rate structure from the earlier four slabs (5%/12%/18%/28%) to a simplified three-tier structure (5%/18%/40%), with the 40% rate reserved for a narrow list of de-merit and luxury goods. It applies prospectively from the effective date — it does not retrospectively change tax already correctly charged and paid under the earlier rate structure for supplies made before that date. However, contracts, standing invoice templates, or ERP rate masters not updated after the effective date are a real and common source of stale-rate invoicing going forward, which is exactly what the health check's classification review is designed to catch.

Practitioner noteThe most common post-rationalisation finding we see is not a retrospective liability — it is a business continuing to invoice at an old rate weeks or months after the change because nobody updated the billing system's rate master. That is a live, ongoing exposure until corrected.
What is Section 17(5) 'blocked credit' and why does it come up so often in health checks?

Section 17(5) of the CGST Act lists specific categories of input tax credit that cannot be claimed even though GST was validly paid on the purchase — including motor vehicles (with narrow exceptions for further supply, transport of passengers, or driving training), food and beverages, health services, and club/gym memberships unless they are statutorily obligatory for the employer or used for making a further taxable outward supply of the same category, works contract services for construction of immovable property (with an exception for plant and machinery), and goods lost, stolen, destroyed, or given away as gifts or free samples. These categories are commonly and often innocently misclaimed because the underlying purchase is a genuine, GST-paid business expense — it just happens to fall in a category the law specifically blocks.

Practitioner noteEmployee health insurance and vehicle-related credits are the two categories where we most frequently find inadvertent over-claims — usually because the accounts team applied the general rule ('GST paid on a business expense is creditable') without checking the specific carve-out.
We received an ASMT-10 scrutiny notice. Can a health check help now?

Yes — this is one of the most valuable times to run a targeted health check, even though ideally it would have happened before the notice. An ASMT-10 notice under Section 61 identifies specific discrepancies the department has already found through automated return-matching; PNPC can rapidly reconcile the flagged period, prepare a defensible reply within the statutory response window, and simultaneously check whether the same root cause exists in other periods not yet flagged by the department — so you are not responding to one notice only to receive a second one for an adjacent period.

Practitioner noteWe always check adjacent periods when responding to a notice. If a mismatch pattern exists in March, it is very often present in the surrounding months too — and self-disclosing that proactively, on your terms, is materially better than waiting for the department to expand the scrutiny itself.
What is DRC-03 and when would we use it after a health check?

Form DRC-03 is the mechanism for making a voluntary payment of tax, interest, or penalty on the GST portal — used when a taxpayer identifies a shortfall or error and wants to correct it before the department raises a formal demand. If a health check identifies, for example, under-paid reverse-charge tax or an ineligible ITC claim, PNPC computes the correct tax and applicable interest under Section 50, and files DRC-03 to regularise the position voluntarily.

Practitioner noteA documented voluntary DRC-03 payment, made before any departmental communication on the same issue, is treated far more favourably in law and in practice than the same amount recovered after a show-cause notice — it materially reduces penalty exposure and is one of the primary reasons a health check pays for itself.
How far back does a GST Health Check typically go?

Most engagements cover the past 2–3 financial years, which balances practical relevance against the increasing difficulty of reconstructing very old records. The statutory limitation period for a Section 73 (non-fraud) demand and a Section 74 (fraud/suppression) demand differ, and both extend beyond a single year — so a health check that only looks at the most recent filing period can miss exposure sitting in an earlier, still-open year.

Practitioner noteWe always ask whether any earlier year has already been the subject of a departmental audit or notice — if it has been examined and closed, there is little value in re-reviewing it; if it has not, and it remains within the department's limitation window, it is usually worth including.
We operate GSTINs in multiple states. Does that change the health check approach?

Yes, materially. Each GSTIN is treated as a distinct person under GST law, which means intercompany or inter-branch transactions between your own GSTINs — stock transfers, common service costs, and shared employee costs — are themselves taxable supplies under Schedule I and must be valued and cross-charged correctly, typically through an Input Service Distributor (ISD) registration or direct cross-charge invoicing. Multi-state businesses are the single most common source of cross-charge valuation errors we find, because the transaction never touches an external customer and is easy to overlook internally.

Practitioner noteCross-charge is one of the most commonly missed GST obligations among multi-state businesses — precisely because no external invoice is generated and no external customer ever complains about it. It only surfaces when a department officer specifically looks for it.
Can a health check help before we raise funding or go through an acquisition?

Yes — GST exposure is a standard line item in financial and tax due diligence for any funding round or M&A transaction, and undisclosed GST risk discovered during diligence routinely triggers valuation adjustments, escrow holdbacks, or deal delays while the issue is investigated and quantified. Running a health check ahead of the process lets you fix correctable issues, and gives you (and your CA) a clear, documented answer to any GST question the counterparty's diligence team raises, rather than an uncomfortable scramble mid-transaction.

Practitioner noteWe have seen deals slow down for weeks purely because a routine ITC reconciliation question from the buyer's diligence team could not be answered quickly. A health check done proactively converts that into a one-page summary handed over on day one of diligence.
What does a GST Health Check typically cost, and how is it priced?

Pricing depends primarily on transaction volume, the number of GSTINs involved, and the number of financial years under review — a single-GSTIN business with straightforward B2B transactions costs meaningfully less to review than a multi-state business with e-commerce sales, RCM exposure, and multiple product categories. PNPC scopes and quotes each engagement individually after the initial scoping call rather than applying a flat rate, since the actual reconciliation effort varies enormously by transaction volume and data quality.

Practitioner noteWe would rather scope accurately after seeing your transaction volume than quote a placeholder number that either overcharges a simple business or under-delivers on a complex one. The scoping call is free and typically takes under an hour.
Do you need access to our GST portal login to do this review?

Not necessarily your primary login credentials — we typically work from exported reports (GSTR-1, GSTR-3B, GSTR-2B, e-way bill and e-invoice reports) that you or your existing accounting team download and share, along with your books of account. Where useful and with your explicit authorisation, we can also be added as an authorised representative on specific matters, but full portal credential sharing is not a prerequisite for the health check itself.

Practitioner noteWe prefer working from exported data wherever practical — it keeps a clean audit trail of exactly what was reviewed and avoids any ambiguity about system access during the engagement.
What if the health check finds something serious — will you have to report it to the department?

No. PNPC's health check is a client-engaged advisory exercise, not a statutory audit with a reporting obligation to the tax authorities. Findings are reported only to you, the client, along with our recommended remediation approach. What you choose to do with those findings — voluntary correction, process fix, or (in genuinely ambiguous cases) obtaining a formal opinion or advance ruling — is your decision, though we strongly recommend acting on material findings given the compounding cost of interest and the harsher treatment of issues discovered by the department rather than disclosed voluntarily.

Practitioner noteWe are candid with every client about this: our job is to find the truth in your numbers and lay out the options clearly. We are not going to sugar-coat a material finding, but we are also not a regulator — the remediation decision, and its timing, is yours.
Our GST returns have always been filed by an outsourced bookkeeper. Is a health check still worth it?

Often more so. Outsourced return filing, especially when priced on a per-return or retainer basis rather than a reconciliation-outcome basis, can create an incentive to file on time rather than file correctly reconciled — the return goes in, the deadline is met, but the underlying books-to-return tie-out is not always performed with the same rigour. A health check provides an independent, second-party verification of exactly what has been filed on your behalf, which is valuable oversight regardless of how competent your existing preparer is.

Practitioner noteThis is not a comment on any specific preparer's competence — it is simply that filing-focused engagements and reconciliation-focused engagements have different natural incentives. Having both is good practice, not a sign of distrust in either.
What is the difference between GSTR-1 and GSTR-3B, and why do they need separate reconciliation?

GSTR-1 is the detailed, invoice-level statement of outward supplies filed monthly or quarterly (under QRMP), reporting each sale transaction individually. GSTR-3B is a summary self-assessment return, filed monthly, on which the actual tax payment is made — it aggregates outward liability, inward ITC, and net tax payable. Because they are prepared and filed as separate processes (sometimes even by different team members or systems), the total values in GSTR-1 and GSTR-3B for the same period frequently diverge — this GSTR-1 vs GSTR-3B mismatch is one of the most common automated triggers for an ASMT-10 scrutiny notice.

Practitioner noteWe have seen this mismatch arise simply because GSTR-1 is prepared from the sales register directly, while GSTR-3B is prepared from a summary trial balance extract — two data sources that should agree but are pulled through different processes and can silently drift apart over time.
Does a GST Health Check cover e-invoicing compliance too?

Yes, for businesses above the applicable e-invoicing turnover threshold (which the CBIC has progressively lowered over successive notifications since e-invoicing was introduced). We verify that Invoice Reference Numbers (IRNs) are being generated for all applicable B2B invoices, that IRN-registered values tie out against GSTR-1 outward supply data, and that no invoices requiring e-invoicing were issued without the required IRN — since an invoice without a valid IRN, where mandatory, is not treated as a valid tax invoice for ITC purposes at the recipient's end.

Practitioner noteThe e-invoicing threshold has been lowered multiple times since introduction, which means a business that was below the threshold in one financial year can find itself above it in the next without necessarily updating its billing process. We always confirm the currently applicable threshold for your business at the time of the health check rather than relying on what applied last year.
What if we find that we have over-paid GST, not under-paid?

This happens more often than most businesses expect — commonly from applying a higher rate than applicable, not claiming eligible ITC out of caution, or double-counting a supply across GSTR-1 and a manual correction. Excess tax paid can potentially be claimed as a refund under Section 54 of the CGST Act, subject to the applicable limitation period (generally two years from the relevant date) and the unjust enrichment test, or adjusted against future liability in specific circumstances. A health check surfaces these opportunities just as rigorously as it surfaces under-payment risk.

Practitioner noteBusinesses tend to assume a GST review only finds bad news. In our experience, a meaningful minority of health checks surface at least one over-payment or unclaimed-credit opportunity worth pursuing — conservative filing habits, while safer in spirit, still leave money on the table if never revisited.
How does a health check treat credit notes and debit notes?

Credit and debit notes must be linked to the original invoice, reported in GSTR-1 within the statutory timeline, and correspondingly adjust the ITC available to the recipient. A common finding is a credit note issued in the accounting system (reducing revenue in the books) that was never reported in GSTR-1 — creating a mismatch between books revenue and GST-declared outward supply value, and potentially leaving the recipient claiming ITC on a value that has already been reduced.

Practitioner noteCredit notes issued near a financial year-end are a particular risk area — if issued after the statutory reporting deadline for that financial year has passed, the GST adjustment may no longer be permissible even though the accounting adjustment has already been made in the books.
Is the health check report useful for our bank or for a loan application?

Indirectly, yes. While a GST Health Check report is not a certified financial statement, banks and NBFCs increasingly review GST return data (turnover trends, ITC patterns) as part of working capital and term loan assessments, since GSTR-3B turnover is an independent, government-verified data point that is harder to manipulate than internally prepared financials alone. A clean, reconciled GST filing history — which is exactly what a health check helps establish and maintain — supports a stronger credit profile and reduces friction during a bank's own verification process.

Practitioner noteWe increasingly see banks cross-checking GSTR-3B turnover against the turnover claimed in a loan application. A business whose GST-declared turnover and loan-application turnover diverge faces awkward questions regardless of which number is more accurate — reconciled, consistent numbers avoid this entirely.
What if the health check finds an issue that goes back further than the standard limitation period?

Findings outside the department's current assessment limitation window for demand purposes still matter for two reasons: first, certain limitation periods can be extended in fraud or suppression scenarios, and second, an unresolved historical issue can indicate an ongoing process flaw that is still actively generating new-period exposure even if the oldest instances are now time-barred. PNPC flags historical findings with context on their current enforceability, while prioritising the fix for the underlying process so the issue stops recurring going forward.

Practitioner noteWe are careful not to overstate risk on genuinely stale, time-barred items just to justify a longer engagement — but we are equally careful to check whether the root cause behind an old finding is still live in the current period, which is usually the more important question.
Our turnover is well below any GSTR-9C threshold. Do we still need a health check?

The GSTR-9C self-certification requirement applies only above a specified turnover threshold, but GST compliance risk — reconciliation mismatches, RCM under-payment, blocked credit claims — exists at any turnover level once a business is registered. A smaller business will typically need a lighter-touch, less frequent review than a large one, but 'below the GSTR-9C threshold' is not the same as 'no compliance risk exists.'

Practitioner noteWe scale the health check to the business — a smaller GSTIN with modest transaction volume gets a proportionately lighter, faster, and less expensive review, not the full multi-week process designed for a large multi-state operation.
Can PNPC also handle the actual GST return filing and monthly compliance going forward, not just the one-time health check?

Yes. Many clients move from a one-time health check into an ongoing monthly or quarterly GST return-filing retainer once the initial reconciliation is complete and process fixes are agreed — this way, the disciplined reconciliation approach used in the health check becomes the standing monthly practice rather than a one-time exercise that drifts back out of sync over time.

Practitioner noteThe health check is often the natural entry point into an ongoing engagement — clients who see exactly how much latent risk existed in filings prepared without rigorous reconciliation rarely want to go back to the previous process unchanged.
How does PNPC's Dubai office relevance apply to a GST Health Check, since GST is an Indian tax?

For UAE-headquartered groups with an Indian subsidiary, branch, or liaison office, GST compliance in India still needs to be reviewed with full context of the group's cross-border cost allocations, import of services from the UAE entity (which can trigger RCM liability on the Indian side), and any intercompany transactions between the UAE and Indian entities. PNPC's presence in both Chennai/Bangalore/Hyderabad and Dubai means the Indian GST health check is conducted with visibility into the UAE-side transactions driving it, rather than reviewing the Indian entity in isolation.

Practitioner noteImport of services from a related overseas entity is one of the most commonly missed RCM triggers we see in India-UAE group structures — the Indian entity's team often does not think of an intercompany management fee or shared service charge from Dubai as a taxable import of service requiring RCM payment in India.
What is the single most common finding across the health checks PNPC has performed?

By frequency, it is GSTR-2B vs GSTR-3B ITC mismatches driven by vendor non-compliance — i.e., credit claimed by the business that is not actually reflected in GSTR-2B because the vendor has not filed, or filed late. By value, the largest individual findings tend to come from RCM under-payment on import of services or GTA payments, and from Section 17(5) blocked-credit claims on vehicle or employee-benefit related expenses.

Practitioner noteThe frequency-vs-value distinction matters for prioritisation. A health check that only chased the most common issue (vendor ITC gaps) while ignoring a less frequent but larger RCM exposure would miss the bigger financial risk — our risk register is explicitly ranked by exposure value, not just by how often an issue appears.
Will the health check disrupt our day-to-day accounting team's work?

The data collection phase requires meaningful time from your accounts team to extract and share registers, returns, and reports, but the analytical and reconciliation work itself is performed by PNPC independently. We schedule data requests in batches and provide a clear checklist upfront (rather than ad hoc follow-up requests trickling in over weeks) specifically to minimise the back-and-forth burden on your internal team.

Practitioner noteA poorly scoped health check can turn into a drawn-out, disruptive process through repeated piecemeal data requests. We front-load the full document checklist at the scoping stage precisely to avoid this.
Can a health check be done for just one specific area — say, only RCM compliance — rather than the full scope?

Yes. While a full health check across all reconciliation areas gives the most complete risk picture, a targeted review — for example, focused only on RCM compliance ahead of a specific concern, or only on ITC eligibility ahead of a large capital purchase — is a reasonable and often cost-effective scope when the business has a specific, bounded concern rather than a general need for full assurance.

Practitioner noteWe are upfront when a client's specific concern would be better served by a narrow, faster targeted review rather than the full multi-week process — a full health check is not always the right tool for every business's stage or specific question.
What is Rule 86B and does the health check check for it?

Rule 86B restricts the use of the Electronic Credit Ledger to discharge output tax liability to a maximum of 99% of the tax liability for a tax period, for taxpayers whose taxable value of supply (other than exempt and zero-rated supply) exceeds ₹50 lakh in a month — meaning at least 1% of the liability must be paid in cash, subject to specified exceptions (such as having paid more than ₹1 lakh income tax in each of the preceding two years, or receiving a refund of unutilised ITC above a specified amount). This rule is aimed at curbing fake invoicing and is specifically checked where the business's monthly taxable supply crosses the ₹50 lakh threshold and the exceptions may not clearly apply.

Practitioner noteRule 86B is often overlooked by businesses whose ITC balance comfortably covers their output liability every month — the rule can still bite even with a healthy credit balance, purely because of the 1%-cash-payment mechanism, unless a specific exception applies.
How do you handle a health check for a business using the Composition Scheme?

The reconciliation approach differs meaningfully for a Composition taxpayer, since they file a simplified quarterly statement (CMP-08) and an annual return (GSTR-4) rather than GSTR-1/3B, cannot claim input tax credit at all, and cannot charge GST separately on invoices. The health check for a Composition Scheme business instead focuses on eligibility verification (confirming the turnover and supply-mix conditions for remaining in the scheme continue to be met), correct tax computation at the applicable composition rate, and identification of any inadvertent regular-scheme-style invoicing (charging GST separately, which a composition dealer is not permitted to do) that could jeopardise the scheme eligibility.

Practitioner noteThe most damaging Composition Scheme error we see is a business inadvertently issuing a tax invoice with GST charged separately, rather than the 'Bill of Supply' required under the scheme — this alone can be treated as ineligible use of the scheme for that period.
Do you also review TCS (Tax Collected at Source) for businesses selling through e-commerce operators?

Yes. Where a business sells through an e-commerce operator such as Amazon, Flipkart, or a similar marketplace, the operator is required to collect TCS under Section 52 on the net value of taxable supplies and deposit it against the seller's GSTIN. The health check reconciles the TCS credit reflected in the seller's Electronic Cash Ledger against the operator's TCS statements and the seller's own sales records through that platform, since discrepancies here directly affect the seller's available cash-ledger balance and net tax payable.

Practitioner noteSellers on multiple marketplaces sometimes struggle to reconcile TCS credit specifically because each operator reports on its own schedule and format — we consolidate this across all platforms a client sells through as part of the health check.
What happens after the health check is complete — is there any follow-up?

The engagement concludes with the risk register and findings report, a discussion of the remediation plan for each material item, and — where the client opts for it — hands-on support executing that remediation (DRC-03 filings, return amendments, or process changes with the accounting team). PNPC also recommends a follow-up review, typically at the next annual cycle, specifically to verify that agreed process fixes were actually implemented and are working, not just agreed to on paper.

Practitioner noteThe value of a health check compounds when the follow-up review happens. We have seen agreed fixes from a first review lapse within a year simply because nobody checked whether the new process was actually being followed — the follow-up review closes that loop.
Why PNPC Global

PNPC GST Health Check vs typical alternatives

AspectPNPC GlobalSoftware-only GST reconciliation toolGeneric compliance vendorDoing nothing until a notice arrives
Root-cause analysisEvery mismatch traced to a specific cause with a remediation recommendationFlags numerical variances; does not explain or resolve themOften limited to filing accuracy, not root-cause diagnosisNo analysis — issue surfaces only when the department flags it
Rate rationalisation reviewHSN/SAC and invoice templates specifically checked against the September 2025 rate structureDepends on software being updated and configured correctly by the userInconsistent — depends on vendor's own update disciplineStale-rate invoicing can continue for months undetected
RCM and blocked credit reviewDedicated review against Section 9(3)/9(4) and Section 17(5)Generally not covered by standard reconciliation toolsSometimes covered, often only at a surface levelNot reviewed at all
Remediation supportDRC-03 computation, return amendments, and process fixes included in follow-throughNone — flags the issue and stops thereVaries, often a separate paid engagementNone
Continuity across notice, audit, and diligenceSame risk register serves departmental response, GSTR-9C prep, and M&A/investor diligenceNot applicable — output is a data file, not a working paperRarely integrated across these use casesReactive scramble each time, with no prior documentation
India-UAE cross-border contextReviewed with visibility into UAE group transactions where relevant, via PNPC's Dubai officeNot applicableRarely availableNot applicable
SincePractising CA firm since 1986; GST-specific expertise since the regime's 2017 launchVaries by productVaries by vendorN/A

What the PNPC package includes

  1. 01

    Full four-way reconciliation: books, GSTR-1, GSTR-3B, and GSTR-2B for the agreed review period

  2. 02

    Post-September-2025 rate rationalisation classification review across your HSN/SAC codes and invoice templates

  3. 03

    Reverse Charge Mechanism (RCM) compliance check across all applicable notified categories

  4. 04

    Section 17(5) blocked-credit review to identify wrongly claimed ineligible ITC

  5. 05

    E-way bill and e-invoice (IRN) tie-out against GSTR-1 outward supply data, where applicable

  6. 06

    Vendor-wise ITC gap list to support your accounts payable team's follow-up with non-compliant suppliers

  7. 07

    GSTR-9/GSTR-9C readiness assessment and working-paper preparation

  8. 08

    Prioritised risk register with statutory basis, estimated exposure value, and recommended remediation path for every finding

  9. 09

    DRC-03 voluntary payment computation and filing support for any finding the client chooses to correct

  10. 10

    One follow-up review scheduling recommendation to verify agreed process fixes were implemented

Do not wait for an ASMT-10 notice to find out what your GST filings actually say. Talk to PNPC about a GST Health Check — and walk into your next departmental audit, funding round, or annual filing with the answers already prepared.

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