How to File ITR Online FY 2025-26 (AY 2026-27): The Complete Expert Guide to Income Tax Return Filing

1. Who Must File ITR for FY 2025-26?

Understanding whether ITR filing is mandatory for you is the first and most important step. The obligation is determined by income level, transaction thresholds, residential status, and entity type — not just by tax liability.

Mandatory ITR Filing Conditions — Individuals

Filing is mandatory if any one of the following conditions is satisfied:

Additionally, ITR filing is mandatory for all companies and firms regardless of profit or loss, and for any entity required to file under Section 139(4A), 139(4B), or 139(4C).

2. ITR Due Dates — AY 2026-27 KEY DATES

Missing the ITR due date is one of the most expensive mistakes a taxpayer can make — it triggers penalties, interest, and the loss of the right to carry forward certain losses. Mark these dates carefully.

Late Filing Penalties — Section 234F

3. Which ITR Form to File? — Complete Selection Guide for FY 2025-26

Selecting the wrong ITR form renders your return defective. The Income Tax Department will issue a notice requiring you to file a revised return in the correct form. Here is the definitive guide:

4. Documents You Need Before Filing ITR for FY 2025-26

Gathering the right documents before you open the e-filing portal saves enormous time and prevents errors. Here is the complete document checklist organised by category:

Basic Identity and Banking Documents

• PAN Card — your user ID for the Income Tax portal
• Aadhaar Card — mandatory for most taxpayers; linked mobile number needed for OTP-based e-verification
• Bank Account Details — IFSC code and account number for refund credit (account must be pre-validated on the portal)

Income-Related Documents

• Form 16 — issued by employer; contains salary details and TDS deducted. Part A shows TDS, Part B shows salary breakup and deductions claimed.
• Form 16A / 16B / 16C — for TDS on non-salary income (interest, rent, professional fees)
• Bank passbook or statements — for savings account interest, FD interest, and any other bank income
• Interest certificates from banks, post offices, and NBFCs for FD and RD interest income
• Rental income details — rent agreements, municipal tax receipts if you have house property income
• Capital gains statements — from stockbroker (for shares), mutual fund houses or CAMS/KFintech (for MF units), and property sale documents
• Dividend income statements — from registrars or company communications

Deduction and Exemption Documents (Old Tax Regime)

• Section 80C: LIC premium receipts, PPF passbook, ELSS investment statements, home loan principal repayment certificate, NSC certificates, children’s tuition fee receipts
• Section 80D: Health insurance premium receipts for self, spouse, children, and parents
• HRA exemption: Rent receipts, rent agreement, landlord’s PAN (if rent > ₹1 lakh/year)
• Home Loan Interest Certificate: From the lending institution showing principal and interest split
• Section 80CCD(1B): NPS contribution statement with PRAN number
• Section 80G: Donation receipts with PAN of donee organization
• Section 80E: Education loan interest certificate from the lender

5. Form 26AS, AIS, and TIS — Your Most Critical Pre-Filing Step

Before touching the ITR form, spend time reviewing three key documents available on the Income Tax portal. These documents hold the Government’s records of all financial transactions linked to your PAN — and if your ITR doesn’t match them, expect scrutiny notices.

Form 26AS — Tax Credit Statement

Form 26AS is the consolidated tax credit statement showing all taxes deposited against your PAN: TDS from salary, TDS from bank interest, TCS collected, Advance Tax paid, and Self-Assessment Tax. Download it from the e-filing portal under “e-File → Income Tax Returns → View Form 26AS.” Cross-check every TDS entry with your Form 16 and bank certificates. Any mismatch must be resolved before filing.

AIS — Annual Information Statement

AIS is a far more comprehensive document introduced in 2021. It aggregates all financial transactions reported against your PAN from multiple sources: employers, banks, mutual fund houses, stock exchanges, registrars (for property), foreign remittance agencies, and more. AIS includes salary income, interest income, dividend income, securities transactions, mutual fund purchases/redemptions, property transactions, and foreign remittances.

TIS — Taxpayer Information Summary

TIS is a summarised version of AIS that shows category-wise totals for easy review. It is especially useful for cross-referencing your own records at a high level before drilling into the detailed AIS.

6. How to File ITR Online — Step-by-Step Process (AY 2026-27)

Follow these eight steps to file your ITR accurately on the Income Tax e-filing portal at incometax.gov.in.

7. Old vs New Tax Regime — Choosing at ITR Filing Stage

One of the most consequential decisions in your ITR filing is the tax regime. For FY 2025-26, this choice has significant implications given the Budget 2025 changes that made the new regime far more attractive.

The new tax regime is the default for AY 2026-27. If you do nothing, your tax is computed under the new regime. To use the old regime, you must actively opt out during ITR filing.

Regime Choice — Key Rules for FY 2025-26

Before deciding at filing time, compute your exact tax under both regimes. For a comprehensive comparison with examples and a decision framework, refer to our detailed Old vs New Tax Regime Guide and our Income Tax Saving Tips. The Official Income Tax Regime Comparison Calculator is the most reliable tool for this.

8. Key Deductions and Exemptions to Claim in ITR FY 2025-26

If you have chosen the old tax regime, claiming every eligible deduction is essential to minimising your tax outgo. Here is a structured overview of the most important deductions available under the Income Tax Act 1961:

9. Infographic — ITR Filing FY 2025-26: Complete Quick Reference

10. E-Verification — The Final and Critical Step

Filing the ITR is only half the process. E-verification is mandatory to complete the filing. An unverified ITR is treated as if it was never filed — with all the consequences that entails.

You must e-verify your ITR within 30 days of the date of filing. Here are the available methods, ranked by ease:

1. Aadhaar OTP (Most Recommended): Your Aadhaar-linked mobile number must be active. Select “e-Verify via Aadhaar OTP” on the portal, enter the OTP received — done in under 2 minutes.
2. Net Banking EVC: Log in to the IT portal through your bank’s Net Banking. The bank generates an EVC (Electronic Verification Code) which is automatically used to verify your return.
3. Bank ATM EVC: At your bank’s ATM, use the “Generate EVC for Income Tax Return” option using your debit card. The EVC is sent to your registered mobile.
4. Demat Account EVC: Through your depository (NSDL or CDSL) linked account — generates EVC via the securities account.
5. Pre-Validated Bank Account EVC: If your bank account is pre-validated on the IT portal, you can generate EVC through the portal itself using the registered mobile OTP.
6. Physical ITR-V by Speed Post (Last Resort): Print the generated ITR-V (acknowledgement), sign it in blue ink, and send it by speed post to: CPC, Post Box No. 1, Electronic City Post Office, Bengaluru – 560100. This takes weeks and should only be used if all electronic methods fail.

11. 10 Common ITR Filing Mistakes — and How to Avoid Every One

In over two decades of tax practice, these are the mistakes we see most frequently — each of them entirely avoidable with the right preparation.

1. Filing Under the Wrong ITR Form: F&O traders filing ITR-2 instead of ITR-3. Taxpayers with capital gains filing ITR-1. This results in a defective return notice (Section 139(9)) and requires re-filing. Always verify the correct form using the selection guide in Section 3.
2. Not Cross-Checking AIS Before Filing: The most dangerous oversight. The IT Department matches your ITR with AIS automatically. Any income in AIS that is not in your ITR triggers a scrutiny notice. Always download and review AIS before filing.
3. Forgetting to Report FD Interest, Savings Interest, and Dividends: Banks and companies report all interest and dividend payments to the IT Department. Not declaring them in “Income from Other Sources” is a clear mismatch with AIS data.
4. Choosing the Wrong Tax Regime: Salaried taxpayers sometimes inadvertently file under the wrong regime (especially since new regime is now the default) and lose out on either the ₹12 lakh zero-tax benefit or the large deductions of the old regime. Always compute both before filing.
5. Not E-Verifying within 30 Days: Filing without completing e-verification renders the ITR invalid. The 30-day clock starts from the filing date — not the due date. E-verify the same day if possible.
6. Missing Capital Gains from Mutual Funds: LTCG and STCG from mutual fund redemptions during the year must be reported in Schedule CG of ITR-2 or ITR-3. Obtain your capital gains statement from CAMS or KFintech for all fund houses combined.
7. Incorrect TDS Reconciliation: TDS figures in your Form 16 may sometimes differ from Form 26AS due to employer errors. Always file based on Form 26AS amounts and raise a correction request with your employer for any discrepancy.
8. Not Claiming Eligible Deductions: Especially in the old regime, taxpayers regularly leave money on the table by forgetting deductions they are entitled to — Section 80TTA (savings interest), Section 80D (health insurance), or Section 80CCD(1B) (NPS). Review the full list before filing.
9. Not Paying Advance Tax Timely: If your total tax liability exceeds ₹10,000 after TDS, you must pay Advance Tax in quarterly instalments. Non-payment attracts interest under Sections 234B and 234C. Check your liability by September quarter each year.
10. Filing After the Due Date Without Knowing the Consequences: Many taxpayers file belated returns assuming there is no difference. The consequences are significant: no carry forward of capital/business losses, late fee under Section 234F, and interest under Section 234A. File on time — always.

12. Key Takeaways — ITR Filing FY 2025-26

• FY 2025-26 returns are filed for AY 2026-27 under Income Tax Act 1961 — the new Act 2025 applies from FY 2026-27 onwards.
• Due date: July 31, 2026 for salaried individuals; August 31, 2026 for non-audit businesses (Budget 2026 extension).
• CBDT has already notified ITR-1 and ITR-4 forms for AY 2026-27 — check the official portal.
• New Tax Regime is the default for AY 2026-27. To use old regime, actively select it during filing.
• Always download and review AIS before filing — AIS vs ITR mismatch is the leading trigger for income tax notices.
• F&O trading income = business income → must file ITR-3, not ITR-2.
• E-verify within 30 days of filing — unverified ITR = invalid ITR.
• Late filing attracts penalty under Section 234F and loses the right to carry forward capital and business losses.
• Report ALL income sources — salary, interest, dividends, capital gains — exactly as reflected in your Form 26AS and AIS.

13. Frequently Asked Questions (FAQ)

14. Conclusion — File Your ITR Correctly the First Time

Filing your income tax return for FY 2025-26 does not need to be complicated — but it does need to be done correctly, completely, and on time. The cost of errors is real: defective return notices, scrutiny assessments, lost carry-forward opportunities, and penalties that compound over time.

The three pillars of a successful ITR filing are: choosing the right form for your income profile, cross-checking AIS before filing so no income goes undeclared, and e-verifying within 30 days so your filing is legally complete. Master these, and the rest follows.

For more detailed guidance on tax planning, explore our Income Tax Saving Tips and our Old vs New Tax Regime Guide. For capital gains from shares and property, see our Capital Gains Tax India 2025 Guide. The official Income Tax India portal and SEBI are always your most reliable primary sources.

If your return involves complexity — capital gains across multiple assets, foreign income, F&O trading, or business income — work with a qualified CA. Our team at ClearTax Advisors handles ITR filing from simple salaried returns to complex multi-source filings. Get in touch for a consultation today.