How to File Your Income Tax Return (ITR) in India: A Step-by-Step Guide

Filing an income tax return trips people up less on the actual tax math and more on the process itself: which form applies to you, what documents you actually need before you start, and what happens after you hit submit. Here's the whole thing, start to finish.

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Do You Even Need to File?

Filing obligations depend on the applicable year and circumstances. This guide does not determine whether you must file. Use the Income Tax Department’s AY 2026-27 guidance and obtain qualified tax assistance where needed.

Income earned in FY 2025-26 is filed for AY 2026-27 under the Income Tax Act, 1961. The separate Tax Year 2026-27 covers income from 1 April 2026 under the Income Tax Act, 2025. The Department’s transition guidance explains the distinction. This article’s preparation examples concern FY 2025-26 / AY 2026-27.

Step 1: Consult Official Return-Form Guidance

Use the Department’s returns and forms guidance for AY 2026-27, including all exclusions. Having capital gains does not automatically exclude ITR-1: that guidance includes qualifying section 112A gains up to ₹1.25 lakh, subject to its other conditions. This example is not a complete eligibility test. Do not choose ITR-1, ITR-2, ITR-3 or ITR-4 from an abbreviated income-category list or last year’s form alone.

Step 2: Gather Your Documents

• Form 16 — issued by your employer, summarising salary paid and TDS deducted.
• Form 26AS — a consolidated tax statement showing all TDS/TCS against your PAN, available on the e-filing portal.
• Annual Information Statement (AIS) and Taxpayer Information Summary (TIS) — broader statements showing interest, dividends, mutual fund transactions, and other reported financial activity, also on the portal.
• Bank interest certificates for savings and FD interest.
• Capital gains statements from your broker/mutual fund registrar (CAMS/KFintech) if applicable.
• Home loan interest certificate from your lender, if claiming Section 24(b) or 80EEA.
• Investment/insurance premium receipts (80C, 80D) if filing under the old regime.
• Rent receipts if claiming HRA.

Cross-check Form 16, 26AS, and AIS against each other before you start — discrepancies between them are one of the most common triggers for a subsequent notice.

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Step 3: Choose Your Tax Regime

The Department’s AY 2026-27 guidance explains the default regime and different opt-out procedures for business and non-business cases. Check the applicable conditions and form rather than assuming everyone can switch each year. The calculators illustrate only their stated FY 2025-26 / AY 2026-27 assumptions; a lower modelled estimate is not a complete filing conclusion.

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Step 4: File on the Portal

1. Log in at incometax.gov.in using your PAN and password (or register if it's your first time).
2. Go to e-File → Income Tax Returns → File Income Tax Return, select the assessment year, and choose online filing.
3. Select your ITR form (per Step 1) and confirm your filing status (individual, etc.).
4. Review pre-filled data — salary, TDS, interest, and other figures the portal has pulled from Form 16/26AS/AIS. Verify every figure against your own records; pre-filled doesn't mean guaranteed correct.
5. Fill in any missing schedules — capital gains, house property, other income, and claim your deductions if under the old regime.
6. Confirm your regime choice where prompted.
7. Review the computed tax. If tax is due beyond credits and advance payments, use the portal's current e-Pay Tax instructions before submitting. Interest and late-payment treatment depend on the applicable period and current law.
8. Submit the return.

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Step 5: E-Verify — This Step Is Not Optional

Complete verification using the Department’s current e-Verify instructions. Its ITR-V FAQ specifies 30 days for verification or ITR-V submission under Notification No. 2/2024, effective 1 April 2024. It also explains late-verification consequences and treatment of an unverified return. Check the applicable instructions rather than assuming electronic submission alone completes filing.

Check Applicable Filing Dates

Check the official e-filing portal for the applicable return, year and current notifications. Original, belated and revised-return deadlines and consequences are not stated here: annual dates and extensions require separate verification. Do not rely on a generic July/December date as a confirmed AY 2026-27 deadline.

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Common Mistakes

Submitting and forgetting to e-verify. Follow the official verification instructions after submission.

Not reconciling Form 26AS/AIS before filing. These reflect what the tax department already knows from third-party reporting; unexplained gaps between that and your return are a common notice trigger.

Trusting pre-filled data blindly. It's a starting point sourced from reported data, not a guarantee of accuracy — you're responsible for what you finally submit.

Filing on autopilot with last year's form. If your income situation changed (capital gains, a second property, freelance income), the form that worked last year may not apply this year.

Ignoring the regime declaration. Use the applicable official regime-selection procedure; business and non-business cases differ.

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Before You File

Our Income Tax and New vs Old Tax Regime calculators model FY 2025-26 / AY 2026-27 under their stated assumptions. They do not determine filing obligations, return-form eligibility or complete tax liability. Use official filing guidance and review your records separately.