Direct Tax Laws & International Taxation · Assessment Procedure

Return Filing and Self-Assessment under the Income-tax Act, 2025

Updated 5 October 2026 · Fact-checked

Return filing is the statutory duty to report your income for a tax year by the due date. Self-assessment tax is the balance you pay before filing: tax, surcharge, cess and interest, less advance tax, TDS, TCS and reliefs. Identify who must file, find the due date, then classify the return as original, belated, revised or updated.

Understand Return Filing and Self-Assessment

A return of income is the statement in which an assessee reports income, deductions, tax paid and tax payable for a tax year (the 12 months ending 31 March, under the Income-tax Act, 2025). The assessment process starts only after this return is filed. So the return is the first step of every assessment.

Who must file. Companies and firms (including LLPs) must file every year, even with a loss or nil income. Other persons must file if total income, computed before exemptions and the chapter-wise deductions, exceeds the basic exemption limit. Some persons must file regardless of income, for example certain residents holding foreign assets or having signing authority abroad, and persons who meet the specified high-value transaction conditions. Charitable and political entities have their own filing conditions. Read the exact list in the ICAI material.

Types of return. The original return is filed by the due date. A belated return is filed after the due date but within the outer time limit. A revised return replaces an earlier return when you find an omission or a wrong statement. An updated return is a late-correction facility. It lets you report additional income and pay extra tax after the revised-return window has closed. It is allowed only within the prescribed period from the end of the relevant year. It is barred in specified situations, for example where a search has been conducted or where certain proceedings are pending. It is also barred where it would result in lower tax or a higher refund. Check the exact bars and the time limit in the ICAI material.

Self-assessment tax is the tax you compute and pay yourself before filing. Take tax on total income with surcharge and cess. Add interest for late filing, shortfall in advance tax and deferment of instalments. Deduct advance tax, TDS, TCS and any relief or credit. The balance is paid before you file. Under the Act's conditions, a return is defective if the self-assessment tax and interest payable have not been paid before filing, so payment comes first. The late filing fee is a separate payment and is not part of this tax.

Key rules to remember

Self-assessment tax: Tax + surcharge + cess − advance tax − TDS − TCS − reliefs/credits; Pay the balance before filing. If the result is negative, it is a refund claim. Interest is shown as a separate item (see the next formula).
Interest payable with the self-assessment tax: Interest for late filing + interest for shortfall in advance tax + interest for deferment of instalments; These interest amounts are paid along with the self-assessment tax before filing. A return is treated as defective if the self-assessment tax and interest are not paid before filing.
Interest for late filing: 1% per month or part of a month × tax unpaid on the due date; The base is tax after advance tax and TDS/TCS. The period runs from the due date to the date of filing. If no return is filed, it runs to the date of assessment.
Late filing fee: ₹5,000; ₹1,000 if total income does not exceed ₹5,00,000; The fee is separate from tax and interest. It is a separate payment. Confirm the amounts in the Act as amended.
Due date: non-audit individual or HUF: 31 July after the end of the tax year; For tax year 2026-27, this is 31 July 2027.
Due date: audit cases and companies: 31 October after the end of the tax year; This applies to assessees whose accounts need an audit under the Act, and to working partners of such firms. Confirm the full class in ICAI material.
Due date: transfer pricing cases: 30 November after the end of the tax year; This applies where a transfer pricing report is required for international or specified domestic transactions.
Updated return: what is barred: No loss return, no lower tax, no new or higher refund; It is only for reporting more income. It is allowed only within the prescribed period and is barred in specified situations such as search or pending proceedings. Extra tax rises as the filing is delayed.

How to solve Return Filing and Self-Assessment questions

Use the same sequence for any question on returns or self-assessment. It stops you from mixing up due dates and return types.

1Identify the assessee: individual, HUF, firm, LLP, company or other. Note whether an audit or a transfer pricing report is needed.
2Check whether filing is mandatory: the entity type, total income against the basic exemption limit, and any specified conditions.
3Fix the due date from the category: 31 July, 31 October or 30 November after the end of the tax year.
4Compare the actual filing date with the due date. Classify the return as original, belated, revised or updated.
5Compute tax on total income, then add surcharge and cess.
6Deduct advance tax, TDS, TCS and reliefs. Add interest for late filing, shortfall in advance tax and deferment of instalments. The result is the amount payable before filing.
7Add the late fee, if any, as a separate item. State the consequences (interest, fee, loss carry-forward) and conclude.

Quickest way: Date-first shortcut

When to use it: Use this for case-scenario MCQs and short written answers where the main question is the type of return or the interest.

Write the assessee category and its due date first.
Mark the filing date on a mental timeline: before the due date, after it, or after the revised window.
Pick the label from the timeline: original, belated, revised or updated.
For interest, compute net tax due on the due date (after advance tax and TDS), then count months, with a part of a month as a full month.
Write fee and interest as two separate lines, then give the total cash outflow as tax plus interest plus fee.

Common mistakes in Return Filing and Self-Assessment

Using 31 July for every assessee.
31 July is the date students remember best.
Fix: Tie the date to the category. Audit cases and companies use 31 October, and transfer pricing cases use 30 November.
Charging late-filing interest on the gross tax.
Students forget that advance tax and TDS are credited first.
Fix: Take the base as tax less advance tax, TDS and TCS, as on the due date.
Counting a part of a month as zero.
Students treat the period like a daily interest calculation.
Fix: Each month or part of a month counts as a full month.
Treating the late fee as part of self-assessment tax.
Both are paid in cash around the filing date.
Fix: Fee is not tax. Show it as a separate line, and show interest separately from tax.
Using an updated return to claim a refund or reduce tax.
Students assume it works like a revised return.
Fix: An updated return is only for reporting additional income and paying extra tax. It cannot lower tax, create a loss return or raise a refund.
Saying a belated return cannot be revised.
Students confuse the two time limits.
Fix: A belated return can also be revised, within the Act's time limit.

Worked examples

Example 1

Mr Rao, a salaried individual, has no business income and no audit requirement. His tax liability for tax year 2026-27, including surcharge and cess, is ₹3,50,000. TDS is ₹1,20,000 and advance tax paid on time is ₹1,60,000. His total income exceeds ₹5,00,000. He files on 20 August 2027. Ignore interest for shortfall in advance tax. Compute the amount to be paid before filing, and the late fee.

Show the solution

Category: non-audit individual. Due date is 31 July 2027. Filing on 20 August 2027 is late, so this is a belated return.
Net tax due on the due date = ₹3,50,000 − ₹1,20,000 − ₹1,60,000 = ₹70,000.
Interest for late filing: 1 August to 20 August is a part of a month, so it counts as 1 month. Interest = 1% × ₹70,000 × 1 = ₹700.
Self-assessment tax and interest payable before filing = ₹70,000 + ₹700 = ₹70,700.
Late fee: total income exceeds ₹5,00,000, so the fee is ₹5,000. It is a separate payment, not part of the self-assessment tax.
Total cash outflow = tax ₹70,000 + interest ₹700 + fee ₹5,000 = ₹75,700.

Answer: Pay ₹70,700 (tax ₹70,000 plus interest ₹700) before filing. The late fee of ₹5,000 is a separate payment. Total cash outflow is ₹75,700.

Example 2

M/s Delta is a proprietary business. Its proprietor is an individual whose accounts must be audited under the Act. Delta files its return for tax year 2026-27 on 15 November 2027. Later it finds that a receipt was omitted. (a) What is the status of the first return? (b) Can Delta revise it? (c) What if the revised-return window has closed?

Show the solution

Delta is an individual proprietor whose accounts are audited, so the due date is 31 October 2027. Filing on 15 November 2027 is after it, so the return is belated. Interest for late filing and the late fee apply.
The omission is a wrong statement in the earlier return. A revised return can replace it, and a belated return may also be revised, within the time limit given in the Act as amended.
If the revised window has closed, Delta can file an updated return to report the omitted income, provided it is filed within the prescribed period and none of the bars applies (for example search or pending proceedings). It must pay the additional tax, which rises with delay.
The updated return cannot reduce tax or create a refund. Here it only adds income, so it is permitted.

Answer: (a) It is a belated return. (b) Yes, Delta can file a revised return within the Act's time limit. (c) After that, Delta can file an updated return reporting the omitted income, within the prescribed period and if no bar applies, with additional tax and no refund or loss claim.

Exam tips

Start every case answer with the assessee category and its due date. Most marks depend on this one step.
Show the interest calculation line by line. Partial credit is given for the correct base and period even if the final figure is off.
In MCQs, check the return type first. Many wrong options differ only in naming the return belated instead of revised, or updated.
Check the time limits and the additional tax slabs for belated, revised and updated returns in the latest ICAI material. These limits were amended recently, so do not rely on old notes.
Use the 2025 Act's terms: write tax year, not assessment year.

Practice questions from Assessment Procedure

Return Filing and Self-Assessment in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Return Filing and Self-Assessment: frequently asked questions

What is the due date for filing a return for tax year 2026-27?

For non-audit individuals and HUFs it is 31 July 2027. For audit cases and companies it is 31 October 2027. Where a transfer pricing report is needed, it is 30 November 2027.

What is the difference between belated, revised and updated returns?

A belated return is the first return filed after the due date. A revised return corrects an earlier return, whether that return was filed on time or late. An updated return reports extra income after that window, within the prescribed period, and attracts additional tax. It is barred in specified situations.

How do I compute self-assessment tax in the exam?

Start with tax on total income, then add surcharge and cess. Deduct advance tax, TDS, TCS and reliefs. Pay the balance along with interest before filing. Show the late fee as a separate line.

Can I file an updated return to claim a refund?

No. An updated return cannot be used to reduce tax, claim a refund or increase one, or report a loss. It is only for disclosing additional income and paying the extra tax.