The ITR Mistakes That Bring Notices: Wrong Form, Missed Income, Unverified Returns

Every season, the same pattern. A return filed in a hurry in the last week of July meets a notice in October, and the taxpayer says the sentence I have heard more than any other in this work: but I filed on time.

Filing on time is only half the job. The other half is filing a return the department's systems can agree with — on the right form, with every income the department can already see, and verified so that it legally exists. This post takes the common mistakes we fix every season from our service page and shows, mistake by mistake, which notice each one invites and how the fix runs.

Mistake one: the wrong form, chosen out of habit

ITR-1 is a narrow door. It is for resident individuals with total income up to ₹50 lakh, from salary or pension, house property and other sources within the form's limits. The year you sell shares or mutual fund units beyond the small window ITR-1 now allows, let out a third house property, earn foreign income or cross ₹50 lakh, you have walked out of that door — even if the portal let you submit. Business or professional income belongs in ITR-3, or in ITR-4 where you declare presumptive income under Sections 44AD, 44ADA or 44AE. Individuals and HUFs without business income who do not fit ITR-1 belong in ITR-2.

What comes back is a defective return communication under Section 139(9). The logic is completeness, not punishment: the wrong form has no columns for the income your year contained, so in the department's eyes those columns stand unfilled. You get fifteen days from the intimation to rectify, the Assessing Officer can allow more time if you apply before the fifteen days expire, and a return left unrepaired is treated as an invalid return — as if it was never furnished — with the late fee, interest and loss carry-forward damage that follows. The full repair route, agree and disagree responses included, is in our guide to the defective return notice under Section 139(9); read it before you touch the response screen, because the fix is filed in answer to the notice, not as a fresh return.

Prevention is duller and cheaper. Choose the form from this year's income, not last year's habit. Our guide to which ITR form is yours sets out the basic selection map — who fits ITR-1, who moves to ITR-2, and when business income takes you to ITR-3 or ITR-4.

Mistake two: income the department can see, left out of the return

Savings account interest. Interest on fixed deposits you rolled over and forgot. A small dividend. Rent received in a second account. Capital gains on units redeemed in March. None of these feels like income when the year is being lived. All of them are reported.

Your bank, your employer, your broker and your mutual fund report to the department through the Annual Information Statement, and the Taxpayer Information Summary builds on it. When your return and the AIS tell different stories, the mismatch does not vanish at processing. One point of law is worth stating exactly, because older blogs get it wrong: the processing adjustment in clause (vi) of Section 143(1)(a), which spoke of adding income appearing in Form 26AS, Form 16A or Form 16 that the return left out, cannot be made for a return furnished for an assessment year beginning on or after 1 April 2018 — the third proviso to that section bars it. CPC will not simply add the missing income to your total while processing. What happens instead is more likely, and slower: a TDS credit claimed without the matching income, or income visible in the AIS with no return line against it, stays live in your record for a proposed adjustment on a ground that does apply, an inquiry, or a scrutiny selection.

The fix is reconciliation before filing, not explanation after a notice. Match salary to Form 16, TDS credits to Form 26AS deductor by deductor, and every AIS line to a line in your return — or to a written reason why that line is not your income, sent through the AIS feedback route where the entry itself is wrong. Our guide to fixing an AIS, 26AS and Form 16 mismatch covers who can correct what: some entries only the deductor can repair, by filing a correction statement at source.

Mistake three: the return that was submitted but never verified

This one produces no notice at all, which is exactly why it hurts the most. Under Notification No. 2 of 2024, a return must be e-verified within 30 days of uploading. Verify late and the verification date becomes your filing date, with late-filing consequences. Never verify, and the return is treated as not furnished.

Not furnished. So the refund never enters processing. A business or capital loss in that return cannot be carried forward. The acknowledgement the taxpayer waves at the bank is paper over a filing that does not exist in law. And the discovery usually comes months later, in the worst week possible — a loan application, a visa file, a tender.

Think of verification as the second key on a bank locker: the first key opens the outer door and lets you place everything inside, but the locker is not secured — and the valuables are not treated as deposited — until the second key turns. Submission is the first key. Verification is the second. I check for the verification success message and transaction number before I close any filing, my own or a client's, and I keep them with the acknowledgement. If your 30 days have run, the portal's condonation request, filed promptly with the real reason, is the only door back — a discretion you ask for, not a right you hold.

Mistake four: credits claimed loosely, deductions claimed hopefully

TDS claimed in the return that Form 26AS does not carry will not be matched at processing, and an unmatched credit turns a refund into a demand. A deduction claimed above its statutory limit, or a claim inconsistent with another entry in the same return, sits squarely inside the adjustments Section 143(1)(a) does allow — an incorrect claim apparent from information in the return. The department must intimate the proposed adjustment first and consider your reply, and if no reply comes within 30 days, the adjustment is made. A notice of this kind is often self-inflicted arithmetic wearing official clothes.

The same carelessness has a quieter cousin: paying the balance tax after submitting, or not at all, and letting interest under Sections 234A, 234B and 234C build into the intimation. The computation on the portal is not an estimate you can round in your favour. Pay what is due before you submit, enter the challan details exactly as they appear, and let the processing confirm a nil balance instead of discovering one.

The notices these mistakes can draw — and what each one actually is

Two sets of limits on that last row, stated carefully because reassessment law changed on 1 September 2024. A show-cause notice under Section 148A cannot be issued after three years from the end of the relevant assessment year in the ordinary case, or after five years where the income said to have escaped is ₹50 lakh or more on the information with the Assessing Officer — those are the Section 149(2) limits. The Section 148 notice that may follow runs on slightly longer limits under Section 149(1): three years and three months, or five years and three months where the officer holds books, documents or evidence of an asset, expenditure, transaction or entries showing escaped income of ₹50 lakh or more. Older articles quoting three and ten years are describing a law that no longer governs new notices.

Notice the shape of the table. Four of these five are questions. Only a demand that survives your reply is a conclusion, and even that can be appealed. Panic is not a response strategy; reading the section number, noting the date and answering on the portal, in order, is.

The pre-submit check that stops most of this

• Form chosen from this year's income sources — capital gains beyond ITR-1's small window, a third house property, foreign income and business income each move you out of ITR-1.
• Every AIS line traced: into the return, into the feedback route, or into a written note of why it is not yours.
• TDS credits matched to Form 26AS, deductor by deductor; no credit claimed on hope.
• Deductions within their limits and consistent with the rest of the return.
• Balance tax paid before submission, challan details entered exactly.
• E-verification completed in the same sitting, success message saved.
• Missed the due date or found an error in a filed return? A belated return runs to 31 December 2026 with the Section 234F fee — see our guide to belated ITR filing and the Section 234F penalty — and a revised return runs to 31 March 2027, carrying the Section 234-I fee where it is filed after 31 December 2026. And where the year has closed completely, the ITR-U updated return guide explains the last route that stays open.

If a notice from this season is already sitting in your inbox, do not guess which row of that table it belongs to: our income tax return filing team reads the notice against the return as filed, answers within its clock, and rebuilds the filing habit that called it — right form, reconciled statements, verified return — before next July arrives.