Common Tax Filing Mistakes in India: How to Avoid Penalties and Notices

Tax Filing Mistakes Can Be Expensive

Filing your income tax return might seem straightforward, but even small errors can lead to penalties, delayed refunds, or worse — a notice from the Income Tax Department. Here are the 10 most common mistakes and how to avoid each one.

The 10 Most Common ITR Mistakes

1. Choosing the Wrong ITR Form

India has 7 different ITR forms. Using the wrong one makes your return defective.

• ITR-1 (Sahaj): Salaried individuals with income up to ₹50 lakh, one house property, FD interest
• ITR-2: Salary + capital gains, foreign income, multiple properties
• ITR-3: Business/professional income (without presumptive taxation)
• ITR-4 (Sugam): Presumptive taxation under 44AD/44ADA

Tip: If you sold stocks or mutual funds during the year, you need at least ITR-2, not ITR-1.

2. Not Reporting All Income Sources

The most dangerous mistake. The IT department knows about your FD interest, mutual fund gains, rental income, and freelance payments — it is all in your Annual Information Statement (AIS). If your ITR does not match AIS, expect a notice.

Check your AIS at incometax.gov.in before filing. Report everything — even ₹500 in savings account interest.

3. Not Verifying TDS in Form 26AS

Your employer, bank, and clients deduct TDS — but sometimes the amounts do not match. Always download Form 26AS and cross-check every TDS entry before filing. See our TDS guide for details.

4. Forgetting to E-Verify Within 30 Days

Filing your ITR is only step one. You must e-verify within 30 days — via Aadhaar OTP, net banking, or DSC. Without verification, your return is treated as never filed.

5. Claiming Wrong Deductions

Claiming deductions you are not eligible for — like 80C in the new regime, or inflated HRA without rent receipts — can trigger a 50-200% penalty on the misreported amount.

Rule: Only claim what you can prove with documents. Keep receipts for 7 years.

6. Not Reporting Capital Gains from Stocks and Mutual Funds

Every stock sale, mutual fund redemption, or property sale generates capital gains — even if your broker deducted STT. You must report these in your ITR. The IT department gets this data directly from stock exchanges and AMCs.

7. Filing Late

The deadline is typically July 31 (extended sometimes). Late filing penalties:

• Up to December 31: ₹5,000 penalty
• After December 31: ₹10,000 penalty
• Income below ₹5 lakh: Maximum ₹1,000 penalty

Plus, you lose the ability to carry forward certain losses and your refund gets delayed.

8. Wrong Bank Account Details

If your refund bank account is wrong or not pre-validated, your refund bounces and gets stuck for months. Always ensure your bank account is pre-validated and linked to your PAN on the income tax portal.

9. Not Disclosing Foreign Assets

If you have any foreign bank account, investment, or property — even a US stock via a broker — you must disclose it in Schedule FA of your ITR. Non-disclosure penalty: ₹10 lakh under the Black Money Act.

10. Not Filing a Revised Return for Errors

Made a mistake? You can file a revised return under Section 139(5) before March 31 of the assessment year. From 2026, revised returns filed after December 31 attract a ₹5,000 fee.

Penalty Summary

Mistake	Penalty
Under-reporting income	50% of tax on unreported amount
Misreporting income	200% of tax on misreported amount
Late filing	₹1,000 - ₹10,000
Not filing at all	Prosecution + up to 7 years imprisonment
Non-disclosure of foreign assets	₹10 lakh

Related Reading

• Tax Calculator — verify your tax calculation before filing
• TDS Guide — check your TDS is correct
• Tax Planning for Salaried Employees
• Tax Planning for Freelancers

Disclaimer: Tax rules and penalties are based on provisions as of FY 2025-26. The Income Tax Department may update rules. This article is for educational purposes only. Consult a CA for personalised guidance.