Classification, HSN / SAC & Place of Supply Advisory

HSN (Harmonised System of Nomenclature) is an internationally standardised system for classifying traded goods, originally developed for customs purposes and adopted globally including by India's Customs Tariff Act. GST uses HSN codes to classify goods for rate determination and return-reporting purposes — the code you quote on your invoice and in GSTR-1 tells the system (and the department) exactly which category of goods you are supplying and at what rate they should be taxed.

SAC (Services Accounting Code) is the equivalent classification system for services under GST — it does not come from the international HSN framework but was developed specifically for Indian service tax and carried forward into GST. Every taxable service falls under a specific SAC that determines its applicable rate and any exemption eligibility.

The mandatory digit-length depends on your aggregate annual turnover in the preceding financial year, as prescribed by CBIC notification — turnover above the higher threshold requires a longer (more granular) code, and turnover below it requires fewer digits, with the smallest businesses in some cases permitted to omit the code on B2C invoices. The exact threshold and digit requirements are revised periodically by notification, so we confirm the current requirement applicable to your turnover band before finalising your invoice template.

Yes. Effective September 2025, the GST Council rationalised the rate structure from the earlier four-slab system (5%, 12%, 18%, and 28%) into a simplified structure built primarily around a 5% merit rate and an 18% standard rate, with a separate 40% de-merit rate reserved for specified luxury, sin, and select high-end goods categories. Most goods and services that previously sat in the 12% or 28% slabs have been remapped into either the 5%, 18%, or 40% category depending on the specific notification for that heading.

A composite supply, under Section 2(30) of the CGST Act, is two or more goods or services naturally bundled and supplied together in the ordinary course of business, with one being the principal supply — the entire supply is taxed at the rate applicable to the principal supply. A mixed supply, under Section 2(74), is two or more individual supplies bundled together for a single price where they are not naturally bundled — under Section 8, a mixed supply is taxed at the rate applicable to whichever component attracts the highest rate.

This is a classic composite-versus-mixed-supply fact pattern. If the AMC is genuinely inseparable from the equipment sale (mandatory, single invoice, naturally expected together in that trade), it is likely a composite supply taxed at the equipment's rate with the equipment as principal supply. If the AMC is optional, separately priced, or commonly sold independently in your industry, it may be treated as a separate service supply with its own SAC and rate — or the whole arrangement could be challenged as a mixed supply if bundled for a single price without being naturally bundled.

Place of supply, determined under Sections 10-13 of the IGST Act, decides whether a transaction is intra-state (CGST + SGST) or inter-state (IGST). Even though the combined rate is often identical, the tax head matters enormously to your customer: if you charge CGST+SGST but the correct treatment was IGST (or vice versa), your customer's input tax credit claim under the wrong head can be challenged or denied by the department, forcing them to reverse the credit and separately pursue a refund of the wrongly paid tax — a real cash-flow and relationship problem that traces directly back to your invoice.

For goods, place of supply under Section 10 of the IGST Act generally follows the location where goods are delivered to the recipient (or, in specific scenarios, where movement terminates), not necessarily the billing or registered address. For services, the default rule under Section 12 looks at the recipient's location as registered under GST, with specific exceptions for services related to immovable property, events, and certain other categories that follow the location of the property or event instead.

No — export of services qualifies for zero-rated treatment under Section 16 of the IGST Act only if all the conditions in the definition under Section 2(6) are satisfied: the supplier is located in India, the recipient is located outside India, the place of supply is outside India, payment is received in convertible foreign exchange (or a permitted alternative arrangement), and the supplier and recipient are not merely establishments of the same distinct person. If even one condition fails, the transaction is not treated as an export and standard GST applies.

Under Section 2(13) of the IGST Act, an intermediary is a broker, agent, or similar person who arranges or facilitates a supply of goods or services (or securities) between two other persons, without supplying those goods or services on their own account. Section 13(8) of the IGST Act fixes the place of supply for intermediary services at the location of the intermediary itself — meaning even if your client is entirely overseas and you are paid in foreign exchange, if you are acting as an intermediary, the place of supply is treated as being in India, and the transaction does not qualify as a zero-rated export.

Generally, if you are the actual supplier of the development service — you own the deliverable, you contract directly with the client, and you are paid for your own work rather than for arranging someone else's — you are not an intermediary and standard export-of-service rules apply, assuming the other four conditions under Section 2(6) are met. The risk arises in staffing, back-office, or facilitation arrangements where you are effectively connecting the client to a third-party resource or another entity's service, which shifts the analysis toward intermediary treatment.

Supplies of goods or services to a Special Economic Zone (SEZ) unit or SEZ developer are treated as zero-rated supplies under Section 16 of the IGST Act, similar to exports — the supplier can either supply under a Letter of Undertaking (LUT) without payment of IGST, or pay IGST and claim a refund. Correct classification of the supply and confirmation of the recipient's valid SEZ registration and endorsement are prerequisites for this treatment.

Yes. Departmental scrutiny, audit, or assessment proceedings under Sections 73 (non-fraud cases) or 74 (fraud/suppression cases) of the CGST Act can reopen classification questions for past periods within the statutory limitation period, and can raise a demand for the tax shortfall plus interest, and penalty depending on whether the case falls under Section 73 or Section 74. This is precisely why a written, reasoned classification memo prepared at the time of the transaction — not a retrospective justification — carries real evidentiary weight.

Your customer's finance or tax team may flag a mismatch if the code you use doesn't align with what they expect for input tax credit purposes, or if it doesn't match the rate they were quoted. This is a commercial as much as a compliance issue — an unresolved dispute can delay payment or damage the relationship even before any department involvement. We recommend resolving classification questions proactively, before invoicing at scale, rather than reactively after a customer query.

Not necessarily every individual SKU, but every materially distinct product or service category should have a clear, documented classification — especially where the rate consequence is significant, the product sits in a genuinely ambiguous category, or the transaction value is high. Minor product variations within an already-classified category (e.g., different sizes or colours of the same item) typically don't need separate opinions.

Yes — you can apply to the Authority for Advance Ruling (AAR) in your state for a binding ruling on classification, applicable rate, or place of supply for a proposed or ongoing transaction. The ruling binds the applicant and the jurisdictional tax authorities for that specific transaction, though it is not binding on other taxpayers or in other states. If you disagree with an AAR ruling, an appeal lies to the Appellate Authority for Advance Ruling (AAAR).

Each state's AAR bench operates independently and rules only on the specific facts presented by the applicant before it — differences in how the facts were framed, which precedents were cited, and the bench's own reasoning can produce different outcomes for superficially similar products. This is a genuine, acknowledged feature of the current advance ruling system, not a data error.

The HSN/SAC code and applicable rate you finalise flow directly into your e-invoice (IRN generation) schema and your e-way bill, where mandated. An incorrect code at the classification stage propagates automatically into every subsequent e-invoice and e-way bill generated from your system until the master data is corrected — meaning a single upstream classification error can affect hundreds or thousands of downstream documents before anyone notices.

Yes, and they are separate determinations. The import leg is classified under the Customs Tariff Act for basic customs duty and IGST-on-import purposes; the export leg (whether the finished product export itself, or any domestic supply along the way) is classified separately for GST rate and place-of-supply purposes. A favourable classification at import does not automatically carry through to the domestic or export leg — each transaction stage needs its own classification check.

Under reverse charge, the recipient of certain specified supplies — rather than the supplier — is liable to pay GST directly to the government. Import of services from an overseas supplier is a common RCM scenario: the Indian recipient must first determine the place of supply is within India under Section 13 of the IGST Act, and then self-assess and pay IGST under reverse charge, generally with input tax credit available if the service is used for business purposes.

Input tax credit under Section 16 of the CGST Act depends on the tax being correctly charged and properly documented on a valid tax invoice. If the supplier applies the wrong HSN/SAC code, the wrong rate, or the wrong tax head (CGST+SGST versus IGST), the recipient's credit claim can be challenged during their own assessment — even though the error originated with the supplier, not the buyer. This is precisely why classification is a shared commercial risk, not solely the supplier's internal compliance matter.

Keep the written classification memo itself, the product technical specification or service scope of work it was based on, the specific rate notification and statutory sections relied upon, any AAR/AAAR precedent considered, and — for exports — the supporting export documentation (shipping bills, FIRC/e-BRC, contracts). This file should be maintained and updated whenever the product, rate notification, or relevant precedent changes materially.

For any classification or place-of-supply question with real financial consequence — a new product line, an export structuring decision, or a response to a departmental query — we issue a written, reasoned memo citing the specific statutory provisions, notifications, and precedent relied upon. Verbal guidance is appropriate only for quick, low-stakes confirmation questions where the classification is well-established and uncontested.

The fee depends on the complexity of the product or service, the number of distinct categories requiring review, whether export or place-of-supply cross-border questions are involved, and whether precedent research (AAR/AAAR review) is required. We agree a fee in writing before any work begins — there is no standard flat fee because a single well-established product code and a multi-jurisdiction export structuring review are genuinely different scopes of work.

Yes. We assess the correct classification going forward, quantify the potential exposure on past invoices (rate underpayment or overpayment, and any place-of-supply head errors), and advise on the appropriate corrective steps — which may include voluntary disclosure, return amendment within permitted windows, or preparing to respond to a departmental query if one arises. Addressing this proactively, before a notice arrives, generally produces a better outcome than waiting.

Input tax credit already validly availed on purchases made before the rate change remains available under the rules in force at the time of that purchase. The rate rationalisation itself governs the tax applicable on supplies made on or after the effective date — it does not retrospectively alter credit already taken on earlier purchases, though businesses transitioning stock across the rate-change date should review invoicing and stock valuation carefully for the transition period.

Yes — the rationalised structure retains a higher de-merit rate of 40% for a specified, limited list of luxury, sin, and select high-value goods categories identified by the GST Council notification, distinct from the general 5% and 18% slabs that now cover the great majority of goods and services. Confirming whether your specific product falls in this residual higher-rate category (rather than assuming it now attracts 18%) requires checking the specific notification for that heading.

Our core scope is GST classification (HSN/SAC for rate, exemption, and place-of-supply purposes) and place-of-supply determination. Where an import is involved, we address the GST-on-import (IGST at customs) angle as part of the same engagement, and coordinate with customs duty specialists where a separate basic customs duty classification dispute requires dedicated customs law expertise beyond the GST question.

Using a generic or residual heading without genuine analysis is a common shortcut that carries real risk — residual/catch-all headings under the Customs Tariff Act's interpretive rules are meant to apply only when a product genuinely does not fit any more specific heading, not as a default convenience. A department review that finds a more specific heading actually applied (often at a different rate) can result in a demand for the shortfall plus interest, precisely because the 'easy' code was never properly tested against the interpretive rules.

We recommend an annual review at minimum, and an immediate ad-hoc review whenever a rate notification changes (such as the September 2025 rationalisation), a relevant AAR/AAAR ruling is issued, or your product undergoes even a modest specification change. Classification that was correct and defensible five years ago can become outdated purely because the regulatory landscape moved, not because your product did.

Yes. Where a classification or place-of-supply position is challenged through a show-cause notice, adjudication proceedings under Section 73/74 of the CGST Act, or an appeal, PNPC can prepare the response, represent the position before the adjudicating or appellate authority, and coordinate with litigation counsel where the matter escalates to the GST Appellate Tribunal or courts.

It can be either. Many clients engage us for a specific product launch or a specific dispute on a standalone basis. Others — particularly those with evolving product portfolios, export operations, or a history of departmental queries — include classification review as a recurring component of an annual compliance retainer, alongside GST registration, return filing, and other advisory services.

We are transparent when a fact pattern is genuinely borderline — we present the most defensible position based on the interpretive rules and available precedent, clearly flag the residual risk, and discuss whether an AAR application is warranted to obtain certainty for a high-value or recurring transaction. We do not present a manufactured false certainty on questions where the law and precedent are genuinely unsettled.

Online lookup tools are a reasonable starting point for research, but they typically return the code associated with a keyword match, not a reasoned application of the Customs Tariff Act's interpretive rules to your specific product's composition and principal function. They do not consider composite/mixed supply tests, place-of-supply rules, export conditions, or conflicting AAR precedent — all of which materially change the correct answer for a meaningful share of real transactions. A tool also cannot stand behind its answer if the department challenges it years later; a CA-issued written opinion can.

Yes. PNPC has operating offices in Chennai, Bangalore, Hyderabad, and Dubai. For businesses trading between India and the UAE, we address the Indian GST classification and place-of-supply side, coordinate with our UAE team on the corresponding UAE VAT treatment of the same transaction, and flag where the two regimes' classification or place-of-supply rules diverge — which happens more often than businesses expect, since HSN/SAC and UAE VAT tariff/service classifications are not identical frameworks.

A classification/place-of-supply opinion is a focused, forward-looking (or dispute-specific) determination on a particular product, service, or transaction pattern. A GST health check or GST audit is a broader review of overall compliance — registration correctness, return filing accuracy, reconciliation between GSTR-1/GSTR-3B/GSTR-2B, ITC eligibility, and yes, classification as one component among several. Businesses with a specific classification question should engage this service directly; those wanting a full compliance review should consider the broader health-check engagement.

No professional opinion can guarantee a specific departmental outcome — GST officers retain the authority to take their own view during assessment or audit, and disputes can still arise even on a well-reasoned position. What a properly documented opinion does provide is a defensible, evidence-backed basis for your position, which materially improves your standing in any subsequent query, audit, or appeal compared to having no documented reasoning at all.