Advance Tax for a Small Business: Reforecast Each Instalment
A practical guide to advance tax for a small business, with a worked example, evidence checklist, common mistakes and steps to prepare a defensible working.
AI Summary
A business estimates ₹8 lakh profit in June but expects ₹14 lakh by December. The useful result is a working that explains the facts, the calculation or classification, and the evidence behind the conclusion. This guide shows how to prepare that working and where a reviewer should investigate before accepting the result.
Scope and applicable period
Indian income-tax preparation for FY 2025–26 / AY 2026–27 under the Income-tax Act, 1961. The Income-tax Act, 2025 applies from Tax Year 2026–27; later-period computations require the corresponding provisions and forms.
Verification date: 11 October 2026. Figures and rates identified as assumptions are teaching examples; apply the stated conditions and the actual facts to a real assignment.
The key principle
Advance tax uses estimated current-period liability after relevant credits, not a fixed fraction of last year's tax. For ordinary AY 2026-27 cases, the cumulative instalment percentages are 15%, 45%, 75% and 100% by the relevant June, September, December and March dates. Special presumptive and other cases require separate treatment. Update the estimate when profit, gains or credits change.
Worked example
| Item | Value or fact | What it means |
|---|---|---|
| Revised estimated tax after credits | ₹1,00,000 | Illustrative estimate, not tax on a stated profit |
| Cumulative December requirement | ₹75,000 | Ordinary 75% case |
| Advance tax already paid | ₹45,000 | Verified challans |
| December balance | ₹30,000 | ₹75,000 − ₹45,000 |
If the original business forecast was too low, recalculate the year and compare the cumulative requirement with payments already made. Do not pay another 75% in December on top of earlier instalments. Keep recurring profit, exceptional income and tax credits separately visible. Evaluate applicable interest rules and relief for particular income patterns; a revised forecast does not automatically erase an earlier instalment shortfall.
A practical sequence
Forecast taxable income by head and apply the correct period’s tax framework. Deduct reliable tax credits and compare cumulative liability with instalments paid.
Update the estimate when profits, gains or deductions change and assess interest consequences separately. Keep the cumulative percentage test distinct from a fresh percentage applied only to the latest quarter’s income.
Retain a revised forecast history so that the payment decision can be explained using information available at that date.
Keep gross amounts, taxable amounts and credits distinct
A tax preparation file should explain the movement from source documents to taxable income and then from computed tax to the amount payable or refundable. Gross receipts, bank credits and information-statement values can measure different things. Reconcile them before applying tax rates or claiming credit. Record residential status, income character and the chosen regime where relevant, because these affect treatment. A deduction or withholding certificate establishes one part of the evidence; it does not replace the complete income computation. Maintain a separate list of missing documents and unresolved classification questions.
Evidence checklist
Keep the following records linked to the same entity, period and working version. Identify missing items explicitly; a checked box should mean the document was examined and supports the stated conclusion.
- Latest profit and taxable-income forecast
- Exceptional income and capital-gain estimates
- TDS/TCS and other eligible credit forecast
- Challan-wise payments already made
- Instalment and interest review working
Common mistakes and how to avoid them
- Paying percentages as separate non-cumulative amounts. Compare the conclusion with the latest profit and taxable-income forecast and resolve any conflicting facts.
- Using accounting profit without tax adjustments. Trace the affected item to the tds/tcs and other eligible credit forecast before finalising the working.
- Assuming an increased later payment removes all earlier interest. Use the instalment and interest review working to make the final position and remaining exceptions clear.
Before you finalise
Recheck the example’s assumptions against the actual assignment, resolve the identified exceptions and make the final figure or conclusion traceable to its source. Preserve the reviewed version and the reason for material changes. For this task, the instalment and interest review working should agree with the conclusion presented to the client, reviewer or authority.
Frequently asked question
Should the instalment be based on last year's tax? Last year's result may inform the forecast, but the working should use the current year's estimated liability.
Sources and further reading
Related guide: Income tax computation companies book profit vs taxable income dta dtl.