Income Tax
ITR Filing Guide FY 2025-26: Last Dates, Documents & Step-by-Step Process
Filing your Income Tax Return (ITR) sounds intimidating, but it's far simpler when you know the deadlines, gather the right documents, and follow a clear sequence. Every year, lakhs of taxpayers pay avoidable late fees, lose the right to carry forward losses, or trigger notices — not because their taxes were complex, but because the basics were missed. This is the complete FY 2025-26 (Assessment Year 2026-27) playbook: who must file, the exact due dates, the document checklist in order, which form is yours, the step-by-step process, and the mistakes that cost people money.
What is an ITR and who must file?
An Income Tax Return is the form in which you declare your income, deductions and taxes paid to the Income Tax Department. You must file if any of these apply:
- Your gross total income exceeds the basic exemption limit (₹3 lakh under the new regime).
- You want a refund of excess TDS deducted — filing is the only way to get it back.
- You have foreign assets or income, or you're a company/firm (mandatory regardless of income).
- You deposited over ₹1 crore in a current account, spent ₹2 lakh+ on foreign travel, or paid ₹1 lakh+ in electricity bills.
- You want to carry forward losses (capital or business) to set off against future gains.
Even if your income is below the limit, filing builds a financial record that helps with loans, visas and credit cards — so it's often worth doing voluntarily.
Due dates that matter (AY 2026-27)
- 31 July 2026: Individuals & non-audit cases (most salaried taxpayers and freelancers).
- 31 October 2026: Audit cases (businesses above the audit limits).
- 31 December 2026: Last date for belated or revised returns (with late fee).
- After that: only an ITR-U (updated return), allowed up to 48 months later, with additional tax of 25–70%.
The cost of missing 31 July: a late fee of ₹1,000–₹5,000 under Section 234F, interest at 1% per month on unpaid tax (Sections 234A/B/C), and — the biggest hit for investors — loss of the right to carry forward capital and business losses. File on time and you keep those losses to reduce future tax.
Documents checklist (in the order you'll need them)
- PAN and Aadhaar — these must be linked, or your PAN is inoperative and you can't file.
- Form 16 from every employer you worked for during the year. See our Form 16 guide.
- Interest certificates / bank statements for savings and fixed deposit interest.
- Form 26AS and AIS — download both from the portal and check them before filing.
- Capital gains statements from your brokers for shares and mutual funds. See our capital gains guide.
- Deduction proofs — 80C investments, 80D premiums, rent receipts for HRA.
- Home-loan interest certificate, if applicable.
Which ITR form is yours?
| Form | Who should use it |
|---|---|
| ITR-1 | Salaried up to ₹50 lakh, one house property, interest income |
| ITR-2 | Capital gains, 2+ properties, foreign assets, income > ₹50 lakh |
| ITR-3 | Business/profession with books, F&O and intraday traders |
| ITR-4 | Presumptive business (44AD) / professionals (44ADA) |
Filing the wrong form gets you a defective return notice under Section 139(9) with a 15-day window to fix it. Read the full breakdown in which ITR form should you file.
The step-by-step filing process
- Reconcile with AIS and 26AS first. The department already knows your interest, dividends, share sales and high-value transactions. Returns that contradict your AIS get auto-flagged — so match them before filing.
- Choose your regime. Old vs new can differ by tens of thousands of rupees. Compute both with our free Income Tax Calculator and read old vs new regime.
- Claim everything legally yours: HRA (calculate it here), 80C and 80D, savings-interest deduction (80TTA), and NPS.
- File the return on the income tax portal, paying any balance tax via Challan 280.
- E-verify within 30 days — an unverified return is treated as never filed. Aadhaar OTP takes 30 seconds; you can also verify via net banking or a pre-validated bank account.
- Track your refund — once the return is processed (intimation under Section 143(1)), refunds typically reach a pre-validated bank account in 2–6 weeks.
Common mistakes that cause notices
- Ignoring AIS entries — undeclared interest or share sales are the top trigger.
- Forgetting to e-verify — the return silently lapses.
- Mismatched bank account — refund fails if the account isn't pre-validated.
- Claiming HRA without rent proof — increasingly scrutinised; keep receipts and a rent agreement.
- Wrong regime selection — overpaying because you didn't compare.
Frequently asked questions
Do I have to file if my employer already deducted TDS? Yes — TDS is just tax collected in advance. Filing reconciles it and is the only way to claim a refund if excess was deducted.
What if I miss 31 July? You can file a belated return until 31 December with a late fee, but you lose loss carry-forward.
Can I revise a filed return? Yes — a revised return can be filed until 31 December 2026 to correct mistakes.
How fast is the refund? Usually 2–6 weeks after processing, provided your bank account is pre-validated and the return is e-verified.
When DIY is fine — and when it isn't
A single Form 16, no investments sold, and no property income? DIY filing works fine. But multiple employers, capital gains, F&O trading, foreign assets, or a notice from a past year? The cost of an error far exceeds an expert fee. Taxwapsi's CA-assisted ITR filing starts at ₹1,999, including regime optimisation, AIS reconciliation and e-verification. Explore everything tax on our ITR hub.