Introduction
A client says in the last week of March, “We will sort the tax issues in April.” A CA usually knows that by then, the real damage may already be done. March is the month when weak estimates, wrong withholding positions, unresolved vendor data, and poor reconciliations get frozen into the books and later spill into returns, audits, and notices. For CAs, the safest March strategy is not rushing to close. It is a controlled clean-up.
1. Treating the final advance tax as a payment exercise instead of a computation exercise
One of the most common March mistakes is focusing only on challan payment and not on recomputing taxable income properly. The Income Tax portal states that where tax exceeds ₹10,000, advance tax is payable in instalments, with 100% due by 15 March. It also clarifies that if an advance-tax challan is generated on or after 16 March, the challan remains valid only up to 31 March of that financial year. For CAs, that means the final March working cannot be reduced to “pay something and adjust later.” A weak estimate can trigger interest exposure, and even a delayed challan can become a practical filing problem.
2. Booking year-end provisions without testing the TDS consequence
Another frequent March error is assuming that a year-end provision can be booked now, and TDS can be evaluated later. In practice, that is risky!
Where the payee and liability are reasonably identifiable, the TDS question usually arises immediately; where the provision is genuinely estimated, and the payee is not identifiable, the issue becomes more nuanced. A professional note analysing year-end expense provisions highlights why this remains a recurring controversy area. The mistake for CAs is not creating provisions. The mistake is failing to classify them. By March-end, provisions should be split into at least two buckets: identifiable liabilities requiring immediate TDS review, and truly provisional items requiring strong documentation and follow-up.
3. Leaving old TDS/TCS correction statements for “later”
This March has a particularly important trap. The Income Tax Department homepage is currently carrying a notice asking deductors and collectors to file TDS/TCS correction statements for FY 2018-19 (Q4) to FY 2023-24 (Q3) by 31 March 2026. The same notice says that from 1 April 2026, such filings become time-barred because of the repeal transition and the new limitation rule under section 397(3) of the Income Tax Act, 2025.
For CAs, this is not a back-office issue. It directly affects unresolved PAN errors, short deductions, wrong section reporting, and old credit mismatches that many clients assume can always be fixed later. This year, that assumption is especially dangerous.
4. Ignoring MSME vendor dues until the tax-audit stage
Many March problems are created because MSME dues are treated as an audit disclosure issue instead of a tax deduction issue. Section 43B(h) links deductibility of payments to micro and small enterprises to the timeline under section 15 of the MSMED Act, not to the normal return-filing date relaxation that taxpayers are used to under section 43B. Delayed payment beyond the specified period can lead to disallowance, and also points to the related delayed-payment consequence under the MSMED framework. For CAs, March is the month to identify which vendors are qualifying micro or small enterprises, what the contractual terms are, and which balances need immediate closure.
5. Going into year-end without a tax-credit reconciliation
A large number of filing-season disputes are not discovered in the tax computation at all. They appear later as credit mismatches. The e-Filing portal’s Tax Credit Mismatch guidance specifically covers mismatches in TDS, TCS, advance tax, self-assessment tax, and challan amount against Form 26AS. It also states that where TDS mismatches exist, the deductor may need to file a revised TDS return, and where other tax-credit issues exist, correction may require a revised return or rectification depending on the stage. For CAs, this means March should include a structured reconciliation of books, challans, 26AS, deductor reporting, and client workings. Leaving that exercise to return season is how valid credits get missed or trapped in correction cycles.
Conclusion
The best March compliance work is usually invisible. It is the quiet correction of estimates, ledgers, vendor data, withholding positions, and tax-credit records before they harden into filing errors. For CAs across practice sizes, that is the real difference between a controlled year-end and a reactive one.
