ITR Filing Guide for AY 2026-27 (FY 2025-26)

Filing your Income Tax Return on time is not just a legal obligation — it protects your refund, preserves your right to carry forward losses and keeps you out of the Income Tax Department's compliance radar. This guide walks through everything an individual, salaried professional or small business owner in India needs to know to file their ITR correctly for Assessment Year 2026-27.

Assessment year vs financial year — get this right first

Every filing season we receive panicked calls from clients asking 'which year do I file?'. The rule is simple: the assessment year (AY) is the year in which you assess the income earned in the previous financial year (FY).

• Financial Year (FY) 2025-26 = 1 April 2025 to 31 March 2026 — this is when you earned the income.
• Assessment Year (AY) 2026-27 = 1 April 2026 to 31 March 2027 — this is when you file the return for that income.
• If you are filing in June, July, August or September 2026, you are filing AY 2026-27.

Who must file an Income Tax Return?

Filing is mandatory if any of the following apply to you for FY 2025-26:

• Your gross total income (before deductions) exceeds the basic exemption limit applicable to your chosen regime.
• You are a resident with foreign assets, foreign bank accounts or signing authority in a foreign account — Schedule FA disclosure is compulsory.
• You wish to claim a refund of TDS or advance tax already deducted.
• You have business or professional income covered under Section 139.
• You deposited over ₹1 crore in current accounts, paid over ₹2 lakh on foreign travel, or paid over ₹1 lakh on electricity bills in the year.
• You sold capital assets (shares, property, mutual funds) — even at a loss, to carry forward the loss.

Choosing the right ITR form

The Income Tax Department prescribes seven ITR forms. Picking the wrong one is the single most common reason returns are processed as 'defective' under Section 139(9).

Old regime vs new regime — and why this matters more than ever

Since AY 2024-25, the new tax regime under Section 115BAC is the default. If you want to be taxed under the old regime, you must explicitly opt out — and salaried taxpayers must do so at the start of the financial year through Form 10-IEA. Business and professional taxpayers can switch only once in their lifetime.

When the new regime usually wins

• Your investment in 80C, 80D, HRA, home loan interest and other deductions is low.
• You are early in your career, renting on company HRA but the rent is modest.
• Your salary structure has few exemptions (LTA, food coupons, etc.).
• Lower slab rates plus the enhanced standard deduction and Section 87A rebate work out cheaper.

When the old regime usually wins

• You have a substantial home loan (Section 24(b) interest deduction up to ₹2 lakh + principal under 80C).
• You pay high rent in metro cities and claim HRA exemption.
• You contribute the full ₹1.5 lakh to PPF/ELSS/insurance under 80C and ₹50,000 to NPS under 80CCD(1B).
• You have substantial medical insurance premium (80D), education loan interest (80E) or donations (80G).

Documents to keep ready before you file

• PAN, Aadhaar (must be linked) and active bank account details with IFSC.
• Form 16 from every employer for the year (Part A + Part B).
• Form 16A for TDS on interest, professional fees, rent.
• Form 26AS and the new Annual Information Statement (AIS) — download from the e-filing portal.
• Bank interest certificates, FD interest statements, dividend statements.
• Capital gains statements from broker (zerodha, ICICI direct, etc.) and mutual fund AMC.
• Home loan interest certificate from the bank (for Section 24(b) and 80EEA claims).
• Investment proofs — LIC, PPF, ELSS, NPS, principal repayment, school fees, medical insurance, donations.
• Rent receipts and landlord PAN (if rent > ₹1 lakh/year for HRA claim).
• If you have foreign income or assets — bank statements, broker statements, employer letter detailing remuneration.

Step-by-step filing flow

1. Reconcile AIS, TIS and Form 26AS line-by-line against your own records. Flag any mismatch (incorrectly reported sale, missing TDS, duplicate entries) — these are the single biggest cause of post-filing notices.
2. Select the correct ITR form using the criteria above. If unsure, ITR-2 is the safer fallback for non-business income.
3. Compute total income under both regimes and pick the better one. Log in to incometax.gov.in, choose 'File Income Tax Return', select AY 2026-27.
4. Pre-fill data is auto-pulled from your PAN — verify every line. Correct salary, interest income and capital gains where the pre-fill is wrong (and it often is).
5. Add all deductions under Chapter VI-A (80C, 80D, 80G, 80E, 80TTA/80TTB) if filing under old regime. New regime allows only 80CCD(2) — employer's NPS contribution.
6. Pay any self-assessment tax due via Challan 280 BEFORE submission. The portal will block submission otherwise.
7. Preview the computation. Match the refund/payable figure with your own working.
8. Submit and immediately e-verify via Aadhaar OTP, net banking, EVC or bank account. Unverified returns are treated as 'not filed' if not verified within 30 days.
9. Download the ITR-V acknowledgement and the filed return PDF. Save both for at least 8 years.

Due dates and late-filing penalties

Miss the original due date and you pay a late fee under Section 234F — ₹1,000 if total income is below ₹5 lakh, ₹5,000 above. Interest under Section 234A runs at 1% per month on the unpaid tax until the return is filed. Worse, losses other than house property loss cannot be carried forward in a belated return.

Common mistakes that trigger notices

• AIS / Form 26AS mismatch — a stock sale or interest entry in AIS not declared in your return.
• Claiming HRA without supporting rent receipts and landlord PAN where required.
• Mixing financial year and assessment year in computations.
• Forgetting to disclose foreign assets in Schedule FA — penalty up to ₹10 lakh under the Black Money Act, regardless of tax.
• Filing ITR-1 when you have any capital gains, even small mutual fund redemptions.
• Not reporting cash deposits above the AIS-tracked thresholds, even if from disclosed sources.
• Switching from new regime to old (or vice versa) for salaried taxpayers without filing Form 10-IEA before the due date.

After you file — what to expect

The CPC (Centralised Processing Centre) usually processes simple returns within 15-45 days. You will see an intimation under Section 143(1) showing the department's computation against yours. If it matches and there is a refund, the refund hits your pre-validated bank account within a few weeks.

If you receive an intimation showing tax demand, do not panic — most are reconcilable. Either the department picked up an extra TDS entry the AIS missed, applied a different regime, or interpreted a deduction differently. You have 30 days to file a response or pay the demand. We help clients respond to over 200 such intimations every year.

Talk to a CA before the deadline

For a salaried profile with only Form 16 income, self-filing on the portal is doable. The moment you have capital gains, business income, foreign income, multiple house properties, or a regime decision to make — the cost of a CA filing (₹999 to ₹2,999 for individuals) is dwarfed by the tax savings, peace of mind and notice-handling support over the next 8 years.