It's July. Your Form 16 has landed in your inbox, the income tax portal is finally behaving, and you're one login away from being "done" for the year. Here's the problem: most people who get a tax notice this year won't get it because they skipped filing. They'll get it because they filed fast instead of filing right.
The due date for most individual taxpayers (ITR-1 and ITR-2 filers) for FY 2025-26 (AY 2026-27) is 31st July 2026. Miss it, or file it carelessly, and the cost isn't just a late fee. It's lost refunds, forfeited losses, and automated mismatch notices that take months to clear. Here are the mistakes that trip up honest taxpayers every single year, and exactly how to avoid each one.
The Deadline, in One Table
Before the mistakes, know exactly which date applies to you.
| Taxpayer Category | Due Date (AY 2026-27) |
|---|---|
| Individuals filing ITR-1 or ITR-2 (salaried, no audit) | 31 July 2026 |
| ITR-3 / ITR-4 filers not requiring audit (freelancers, presumptive tax) | 31 August 2026 |
| Belated return (if you miss the above) | 31 December 2026 |
| Revised return (to fix errors in a filed return) | 31 March 2027 |
As of July 2026. The government can extend deadlines in exceptional years, but planning around a possible extension is a bad bet. Penalties apply the moment you cross the original date, extension or not.
Mistake 1: Filing the Wrong ITR Form
Picking the wrong form doesn't just slow you down. It turns your return into a "defective return" that the department can reject outright, forcing a refiling under time pressure.
The quick check: if you have salary income, one house property, and other sources like interest or dividends, ITR-1 usually works, but only if your long-term capital gains from equity shares or mutual funds stay under ₹1.25 lakh for the year and you have no other capital gains. Cross that LTCG threshold, or have gains from property, debt funds, gold, or crypto, and you need ITR-2 instead.
Fix: Before you open the filing utility, list every income source you had this year: salary, rent, interest, dividends, capital gains, crypto, foreign income, and match it against the form's scope. When in doubt, ITR-2 covers a wider range than ITR-1 and is rarely the wrong choice for a salaried individual with investments.
Mistake 2: Not Reconciling Against AIS, TIS, and Form 26AS
The department's systems automatically compare your return against data reported by your employer, banks, brokers, and mutual fund registrars. A missed ₹50 dividend triggers the same automated mismatch flag as a much larger gap. The system doesn't care about the amount, only whether the numbers match.
Fix: Log into the income tax portal and pull your Annual Information Statement (AIS), Taxpayer Information Summary (TIS), and Form 26AS before you fill in a single field. Cross-check every entry against your own records. This one habit prevents the majority of post-filing notices.
Mistake 3: Skipping Exempt Income Because "It's Not Taxable Anyway"
Agricultural income, PPF interest, life insurance maturity proceeds, and LTCG below the ₹1.25 lakh threshold cost you zero tax, but all of it still needs to be disclosed in your return. Leaving it out because "no tax is due" is still a filing error, and it's one of the most common reasons genuine, honest taxpayers get a mismatch notice.
Fix: Treat "exempt" and "not reportable" as two completely different things. If money moved into your account or you realised a gain, it belongs somewhere on the form, even in the exempt-income schedule.
Mistake 4: Leaving Out Foreign Assets or Crypto (VDA) Income
A foreign bank account, an overseas investment, even a small dividend from a US stock held through an Indian platform, all of it requires disclosure under Schedule FA and FSI in ITR-2. Crypto and other Virtual Digital Assets have their own stricter reporting requirements for this AY. Non-disclosure of foreign assets falls under the Black Money Act, which carries penalties well beyond standard income tax proceedings. This isn't a category where you can let things slide.
Fix: If you've ever held a foreign account, foreign stock, or any crypto/VDA transaction this year, assume it needs a dedicated schedule and gather the statements now, not on 30th July.
Mistake 5: Wrong Bank Details Blocking Your Refund
For this AY, the portal only pays refunds into bank accounts that are pre-validated and EVC-enabled on the e-filing portal. A wrong IFSC code, an unvalidated account, or an account linked to a different PAN means your refund has nowhere to go, and fixing it after the fact means raising a refund re-issue request and waiting weeks longer.
Fix: Log into the portal, go to My Profile → Bank Accounts, and confirm your account shows as pre-validated before you start filing, not after you submit.
Mistake 6: Filing Online but Never E-Verifying
Submitting your return is only step one. It isn't legally filed until you e-verify it, and the window for that is just 30 days from the date of filing. Miss that window and your return is treated as not filed at all, with the same late fees and lost carry-forward rights as never filing in the first place.
Fix: E-verify the same day you file, using Aadhaar OTP, net banking, or your preferred method. Don't leave this for later.
Mistake 7: Confusing Belated, Revised, and Updated Return Deadlines
These three sound similar and are not the same thing, and mixing them up is one of the costliest mistakes on this list.
| Return Type | When It Applies | Deadline (AY 2026-27) |
|---|---|---|
| Belated Return | You missed the original due date entirely | 31 December 2026 |
| Revised Return | You filed on time but need to correct an error | 31 March 2027 |
| Updated Return (ITR-U) | You missed the belated deadline too | Within 48 months of the AY, with 25%-70% additional tax |
Fix: A revised return can only be filed if you've already filed an original or belated return. If you haven't filed at all, your only options are the belated return (till 31 December) or, later, an Updated Return, which comes at a steep additional-tax cost. Don't wait for the December deadline thinking you can "revise" your way out of never having filed.
Worked Example: What a Late Filing Actually Costs
Illustrative numbers, not a real case.
Suppose Rohan, a salaried professional, has a total income of ₹9 lakh and misses the 31 July deadline, filing instead on 15 September 2026 with ₹20,000 in unpaid self-assessment tax:
- Late filing fee (Section 234F): ₹5,000, since his income exceeds ₹5 lakh
- Interest (Section 234A): 1% per month on the ₹20,000 unpaid tax for about 2 months, so ₹400
- Lost benefit: Any capital or business losses he had this year cannot be carried forward to future years
- Regime lock-in: Filing after the due date mandatorily pushes him into the new tax regime; he loses the option to choose the old regime even if it would have saved him more
The ₹5,400 in direct penalties is often the smaller part of the cost. The forfeited loss carry-forward and lost regime choice are usually worth more over time than the late fee itself.
FAQs
Q1. What is the ITR filing due date for FY 2025-26 (AY 2026-27)?
31st July 2026 for individuals filing ITR-1 or ITR-2. Taxpayers filing ITR-3 or ITR-4 without a tax audit requirement have until 31st August 2026.
Q2. What happens if I miss the ITR deadline?
You can still file a belated return by 31st December 2026, but you'll pay a late fee under Section 234F (₹1,000 if income is up to ₹5 lakh, ₹5,000 above that), plus interest on any unpaid tax, and you'll lose the right to carry forward most losses.
Q3. Can I choose the old tax regime if I file late?
No. Filing after the due date mandatorily places you under the new tax regime, even if the old regime with your deductions and exemptions would have resulted in lower tax.
Q4. Do I need to report income that's tax-exempt, like PPF interest or agricultural income?
Yes. Exempt income still needs to be disclosed in the appropriate schedule of your return, even though no tax is payable on it. Skipping it is a filing error that can still trigger a mismatch notice.
Q5. What's the difference between a belated return and a revised return?
A belated return is for when you missed the original deadline entirely (due by 31 December 2026). A revised return is for correcting errors in a return you already filed on time or as belated (due by 31 March 2027). You can only revise a return that was actually filed.
Key Takeaways
- The due date for most salaried individuals is 31 July 2026. Don't file around the assumption of an extension.
- Reconcile your AIS, TIS, and Form 26AS before you fill in a single number.
- Report exempt income and small amounts too. The automated matching doesn't care about size.
- Pre-validate your bank account and e-verify your return the same day you file.
- Filing late costs more than the fee. You lose loss carry-forwards and the choice of tax regime.
This content is for educational purposes only and does not constitute investment or tax advice. Tax rules and deadlines are subject to change; markets and tax positions carry risk. Please consult a SEBI-registered investment advisor or a qualified chartered accountant before making any financial or filing decisions specific to your situation.