Filing your Income Tax Return (ITR) is not merely a compliance requirement—it is a financial responsibility that directly impacts your tax liability, refunds, and long-term financial record. With increased digitization and data integration by the Income Tax Department, inaccuracies in filing can now be detected more easily than ever.

For Assessment Year 2026–27, taxpayers must exercise greater diligence to avoid common yet critical mistakes that could lead to notices, penalties, or loss of legitimate tax benefits.

This article outlines the top 10 mistakes to avoid while filing your ITR, along with practical insights to ensure accurate and compliant filing.

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1. Choosing the Wrong ITR Form

One of the most fundamental errors is selecting an incorrect ITR form. Each form is designed for specific taxpayer categories:

• ITR-1: Salaried individuals with simple income structure (income up to ₹50 lakh and limited complexity)
• ITR-2: Individuals with capital gains and no business/professional income
• ITR-3: Individuals with business or professional income

Filing the wrong form may render your return defective under Section 139(9), requiring refiling within a stipulated time.

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2. Not Reporting All Sources of Income

Many taxpayers report only their primary income. However, it is essential to disclose all sources of income, including:

• Interest income (savings accounts, fixed deposits)
• Dividend income
• Freelance or side income
• Capital gains

The Income Tax Department cross-verifies your data with AIS (Annual Information Statement). Any mismatch may lead to notices or scrutiny.

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3. Ignoring Form 26AS and AIS Reconciliation

Before filing your return, ensure proper reconciliation of:

• Form 26AS
• AIS (Annual Information Statement)
• TIS (Taxpayer Information Summary)

Failure to match these with your declared income may result in inconsistencies and possible notices.

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4. Incorrect Claim of Deductions

Claiming deductions without proper eligibility or documentation is a common issue. Typical errors include:

• Incorrect claims under Section 80C
• Claiming HRA without valid rent receipts
• Deducting ineligible expenses

All deductions must be supported by valid documentation and comply with applicable provisions.

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5. Not Selecting the Appropriate Tax Regime

Taxpayers now have the option to choose between:

• Old regime: Allows deductions and exemptions
• New regime: Lower tax rates with minimal deductions

Failing to evaluate both options can result in higher tax liability. A comparative analysis should always be undertaken before filing.

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6. Errors in Personal and Bank Details

Incorrect details such as:

• PAN
• Aadhaar
• Bank account number
• IFSC code

can delay refunds or lead to rejection of the return. Ensure your bank account is pre-validated for smooth processing.

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7. Missing the ITR Filing Deadline

Timely filing is critical. Missing the due date may lead to:

• Late filing fees under Section 234F
• Interest on tax payable
• Loss of ability to carry forward certain losses

It is advisable to track deadlines and file well in advance.

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8. Not Reporting Capital Gains Properly

Capital gains from:

• Stocks
• Mutual funds
• Property transactions

must be reported accurately with proper classification (short-term vs long-term). Errors in reporting may result in incorrect tax computation and notices.

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9. Failure to Verify the ITR

Filing is incomplete without verification. The return must be verified within the prescribed time using:

• Aadhaar OTP
• Net banking
• Digital signature

An unverified return is treated as invalid.

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10. Filing Without Professional Review

Many taxpayers rely entirely on automated tools without fully understanding the tax implications. While such tools are helpful, professional review ensures:

• Accurate reporting
• Compliance with latest tax provisions
• Optimized tax planning

Engaging a qualified Chartered Accountant can significantly reduce the risk of errors.

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Conclusion

Filing your ITR accurately is not just about avoiding penalties—it is about maintaining financial credibility and ensuring tax efficiency.

By being mindful of these common mistakes and adopting a structured approach, taxpayers can file their returns confidently and correctly for AY 2026–27.