Advance Tax Computation — Post-Registration Compliance Guide

Shortfalls against the cumulative percentage due at each date attract interest under Section 234C, generally at 1% per month (or part of a month) on the shortfall, for a limited period tied to each instalment. If total advance tax paid by 31 March is less than 90% of the assessed tax, interest also applies separately under Section 234B, calculated from 1 April of the assessment year until the tax is paid. Both are compensatory interest charges, not penalties, but they compound the cost of deferred payment.

It is mandatory whenever estimated net tax liability for the year exceeds ₹10,000, regardless of business size, with one notable carve-out: resident individuals aged 60 or above who do not have income from business or profession are exempt even if their liability crosses this threshold. Small businesses and freelancers with modest turnover can still cross the ₹10,000 threshold quickly once TDS credit is netted off, so it is worth checking every year rather than assuming exemption.

Taxpayers under the presumptive taxation schemes (Sections 44AD and 44ADA) are permitted to pay 100% of their advance tax liability in a single instalment on or before 15 March, instead of following the four-instalment schedule. Taxpayers outside these schemes can technically pay early or in a lump sum, but doing so ahead of the 15% and 45% checkpoints does not exempt them from the instalment structure — paying late relative to the schedule, even if the full amount is eventually paid by year-end, can still trigger 234C interest for the earlier missed checkpoints.

Tax deducted at source on salary, professional fees, rent, or contract payments is treated as tax already paid toward the year's liability, and it is netted off before computing how much advance tax remains payable at each instalment. It is important to track expected TDS credit (not just credit already reflected in Form 26AS) when estimating instalments, since TDS often reflects with a lag and under-crediting can lead to an inflated advance tax estimate.

If the shortfall is discovered before the relevant instalment date, simply top up the next payment to correct the cumulative percentage. If it is only discovered after the year closes, the shortfall becomes payable as self-assessment tax at return-filing time, and interest under Sections 234B and 234C for the earlier periods of underpayment cannot be avoided retroactively — it accrues based on when the tax should have been paid, not when it eventually is.

Yes, if the estimated liability for that first year exceeds ₹10,000. There is no exemption purely for newness; the obligation is based on projected income and tax, not on how long the business or professional has been registered. Many first-time filers miss the June or September instalment simply because they were not yet tracking this obligation — it is worth setting calendar reminders as soon as registration completes.

Capital gains, lottery winnings, and similar income that could not reasonably have been anticipated at an earlier instalment date are treated more leniently: if such income arises after an instalment date, the corresponding tax can be paid with the immediately following instalment without attracting 234C interest for the earlier period. However, once the income has arisen, it must be factored into all subsequent instalment calculations.

There is no formal 'revision' filing for advance tax — you simply adjust the amount paid at the next instalment to reflect the updated cumulative percentage against your revised estimate. Because each instalment is judged on the cumulative percentage due by that date, a mid-year correction at September or December can still bring you back in line and avoid new interest accruing going forward, even if an earlier instalment fell slightly short.

Retain the challan receipt and CIN for each instalment, the workings behind each income and liability estimate, TDS/TCS reconciliation against Form 26AS and AIS at each checkpoint, and any auditor or CA correspondence on provisional profit figures. These records are useful both for internal cash-flow planning and if the assessing officer raises questions about the basis for your estimates.

Companies and individuals/firms/LLPs generally follow the same four cumulative checkpoints (15%, 45%, 75%, 100% by 15 June, 15 September, 15 December, and 15 March respectively), though the precise statutory wording around the 90% threshold under Section 234B has historically been read slightly differently for corporate versus non-corporate taxpayers. In practice, treating 15 March as the date to be fully paid up removes the ambiguity, and companies should also coordinate advance tax estimates with their statutory audit timeline since provisional profit figures are usually firmer for corporates by each checkpoint.

The primary consequence is compensatory interest under Sections 234B and 234C rather than a separate penalty provision specific to advance tax non-payment. That said, a pattern of consistently ignoring advance tax obligations can attract closer scrutiny during assessment, and unpaid tax carried forward as a large self-assessment liability at filing time can itself raise flags, so treating the instalment schedule as a genuine deadline — not an optional cash-flow choice — remains the safer approach.

PNPC Global tracks each client's instalment calendar, prepares quarterly income and liability estimates based on actual and provisional financials, generates and verifies challans, and reconciles payments against Form 26AS/AIS ahead of each due date — reducing the chance of a missed checkpoint or an avoidable interest charge. Engagement scope and professional fees vary by business complexity and are confirmed after an initial review.