Here’s the short version: the income tax department isn’t waiting for you to make a big mistake anymore. Small, careless ones — a forgotten interest income entry, a mismatched deduction, a wrong bank account number — are now enough to trigger an automated notice within weeks. If you’re filing your return this season, or you’ve already filed and are wondering whether you got away with something, this is worth ten minutes of your Monday.
Why notices are up even though rules haven’t really changed
The tax department hasn’t rewritten the rulebook. What’s changed is the matching. Banks, mutual fund houses, registrars, and even your employer now feed data into the Annual Information Statement (AIS) and the Statement of Financial Transactions (SFT) almost in real time. Your return is compared against that data automatically, not by an officer flipping through paper files months later.
That means a mismatch that used to sit quietly in a database for two years now surfaces before your refund even lands. For a salaried professional or a small business owner filing their own return, this is the practical change: the margin for casual errors has shrunk considerably.
The takeaway
Before you file, pull your AIS and Form 26AS and treat them as the source of truth, not your memory of the financial year.
The nine mistakes that keep showing up
1. Picking the wrong ITR form
Salaried individuals with a bit of freelance income, or those holding foreign shares through an employer’s stock plan, often default to ITR-1 out of habit. If your income profile has grown — capital gains, foreign assets, more than one house property — the simpler form is the wrong form, and the return can be treated as defective.
2. Leaving out “small” income
Savings account interest, fixed deposit interest, a bit of dividend income, or gains from a mutual fund redemption you barely remember — these routinely get left off returns because they don’t feel significant. They are, however, sitting in your AIS in exact figures, reported by the bank or fund house directly.
3. Ignoring capital gains from stocks and mutual funds
This one has grown teeth in the last few years. Every trading and demat account reports transactions to the tax department. If you sold shares or redeemed equity mutual fund units during the year — even at a small profit or loss — that transaction is already visible to the system before you sit down to file.
4. Claiming deductions you can’t back up
Section 80C and 80D deductions — life insurance, ELSS, health insurance premiums — need documentation you can actually produce if asked. Claiming the full ₹1.5 lakh 80C limit without matching investments is one of the more common reasons a return gets flagged for scrutiny.
5. Not reconciling TDS with Form 26AS
If the TDS your employer or bank deducted doesn’t match what you’ve claimed as credit, the system notices before a human does. This is often a timing issue — TDS deposited late — but it still generates a mismatch notice that you then have to explain.
6. Skipping foreign asset disclosure
If you hold foreign bank accounts, foreign stocks (including RSUs or ESPPs from a multinational employer), or overseas mutual funds, disclosure under Schedule FA is mandatory — regardless of value, and regardless of whether you sold anything. This is one of the more strictly enforced requirements, and the penalties for missing it are disproportionately harsh relative to the paperwork involved.
7. Forgetting to club income where required
Income earned by a minor child, or from an asset transferred to a spouse without adequate consideration, has to be clubbed with the parent’s or transferor’s income under clubbing provisions. Filing it separately under the child’s or spouse’s PAN, assuming it lowers the household’s tax bill, is a mistake the system is specifically built to catch.
8. Choosing a regime without comparing both
The new tax regime is now the default, but it isn’t automatically better for everyone — particularly for those with home loan interest, HRA, or significant 80C investments. Filing under the wrong regime doesn’t invite a notice by itself, but it does mean overpaying tax, which is its own quiet cost nobody flags for you.
9. Not e-verifying the return in time
An unverified return is, legally, as good as not filed. This is the most avoidable mistake on the list — a return sits complete and correct, but because it wasn’t e-verified through net banking, Aadhaar OTP, or a digital signature within the window, it never actually counts.
A quick reference table
| Mistake | Why it gets flagged | Simple fix |
|---|---|---|
| Wrong ITR form | Return treated as defective | Match the form to your actual income sources |
| Missed interest/dividend income | Already reported in AIS | Cross-check AIS before filing |
| Unreported capital gains | Reported by broker/AMC directly | Download capital gains statements from each broker |
| Unverified 80C/80D claims | No matching investment on record | Keep proof; claim only what you’ve actually invested |
| TDS mismatch | Doesn’t reconcile with Form 26AS | Verify 26AS a week before filing, not the same day |
| Missed foreign asset disclosure | Mandatory under Schedule FA | Disclose even small or dormant foreign holdings |
| Skipped clubbing provisions | Income shifted to reduce tax | Club minor/spouse income where the law requires it |
| Wrong regime choice | Not a notice risk, but costs money | Compute tax under both regimes before submitting |
| Not e-verified | Return legally incomplete | E-verify within the window, ideally the same day |
What to do if you’ve already filed
If you’ve filed and suspect one of these applies to you, a revised return under Section 139(5) is usually available before the assessment deadline, and it’s a far cheaper fix than responding to a notice later. Filing a revised return proactively, before the department flags anything, is treated very differently from correcting course after a notice arrives.
FAQ
Do I need a chartered accountant to avoid these mistakes?
Not necessarily, if your income is straightforward — salary, one house property, standard deductions. Once capital gains, foreign assets, or business income enter the picture, professional help usually pays for itself in avoided errors.
What happens after I get a notice?
Most notices at this stage are automated mismatch notices, not investigations. They typically ask you to explain or correct a specific discrepancy within a set window. Responding on time, with documentation, resolves the large majority of these without further escalation.
Is small, unreported interest income really worth worrying about?
Yes, mainly because it’s not about the tax owed — often a small amount — but about the mismatch itself, which can trigger a broader review of the return.
Can I switch tax regimes after filing?
Salaried individuals can generally switch between regimes each year when filing, but those with business income have more limited flexibility to switch back and forth. It’s worth checking your specific eligibility before assuming you can change your mind next year.
None of this requires expert-level tax knowledge — it requires ten minutes with your AIS open before you file, not after.