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India’s income tax system is becoming increasingly technology-driven, and even small mistakes while filing Income Tax Returns (ITR) can now trigger scrutiny or notices from the Income Tax Department. With automated data matching, AI-based risk analysis, and digital verification systems becoming more advanced, taxpayers must ensure that every detail mentioned in their ITR matches official financial records accurately.

Experts say taxpayers should no longer treat ITR filing as a simple formality. Financial information from banks, employers, brokers, registrars, mutual funds, GST systems, and other institutions is now closely monitored through digital platforms like the Annual Information Statement (AIS). Any mismatch between declared income and official records can quickly attract attention from tax authorities.

Here are seven major mistakes taxpayers should avoid while filing their Income Tax Return in 2026.

1. Do Not Depend Only on AIS While Filing ITR

The Annual Information Statement (AIS) has become one of the most important documents in the income tax ecosystem because it shows a detailed summary of a taxpayer’s financial transactions collected from various reporting entities.

However, tax experts warn that relying only on AIS while filing ITR may be risky.

According to Mumbai-based Chartered Accountant Dr. Suresh Surana, AIS data may sometimes contain:

• Incomplete entries
• Duplicate transactions
• Reporting errors
• Delayed updates

Experts recommend comparing AIS information carefully with:

• Bank statements
• Form 26AS
• Form 16 or Form 16A
• Investment records
• Salary slips
• Personal account books

Cross-verification helps reduce the risk of notices and future tax scrutiny.

2. The System Can Automatically Detect Mismatches

Modern tax systems are now capable of identifying inconsistencies automatically using advanced analytics and AI-based monitoring.

Taxspanner CEO Sudhir Kaushik reportedly explained that many taxpayers still believe partial disclosure is enough, but current systems can easily compare declared income with spending patterns, investments, and financial transactions.

If income, expenses, or investments appear inconsistent with filed returns, the system may automatically flag the case for review.

This means the chances of receiving notices or additional scrutiny have increased significantly compared to earlier years.

3. Salary Mismatch Can Trigger Tax Queries

One of the most common reasons for tax notices is mismatch in salary information.

If the salary mentioned in the ITR differs from:

• Form 16
• Employer-filed TDS returns
• AIS records

…the Income Tax Department may seek clarification.

Authorities may suspect underreporting of income if discrepancies appear between employer records and taxpayer declarations.

Experts advise employees to verify all salary figures carefully before submitting returns.

4. Forgetting Interest Income Can Become Costly

Many taxpayers unintentionally skip reporting interest income earned from:

• Savings accounts
• Fixed Deposits (FDs)
• Recurring Deposits (RDs)
• Income tax refunds

Banks and financial institutions directly report such interest details to the Income Tax Department, and these entries usually appear in AIS records.

If interest income is missing or only partially disclosed in the ITR, taxpayers may receive mismatch notices from the department.

5. Wrong TDS or TCS Claims May Affect Refunds

Incorrect claims related to Tax Deducted at Source (TDS) or Tax Collected at Source (TCS) can also create complications.

If taxpayers claim higher TDS or TCS amounts than what appears in Form 26AS or AIS, the department may:

• Reduce refunds
• Seek clarification
• Delay processing
• Initiate further verification

Experts strongly recommend checking all tax credits carefully before claiming them in returns.

6. Hiding Large Financial Transactions Can Lead to Investigation

Large-value financial transactions are now closely tracked through AIS and other reporting systems.

Transactions commonly monitored include:

• Property purchases and sales
• Mutual fund investments
• Large credit card payments
• Foreign remittances
• High-value stock market trades

If these transactions do not match declared income levels or are missing from the ITR, tax authorities may initiate inquiries.

Experts say taxpayers should disclose all major transactions properly to avoid unnecessary complications.

7. Incorrect Capital Gains Calculation Can Invite Scrutiny

Capital gains earned from:

• Shares
• Mutual funds
• Property sales
• Other capital assets

…are also reported through brokers and financial institutions.

If capital gains calculations are incorrect or partially disclosed in the ITR, the Income Tax Department may demand explanations or start investigations.

Tax experts recommend carefully calculating:

• Short-term capital gains
• Long-term capital gains
• Indexation benefits
• Applicable exemptions

Improper reporting can create serious tax issues later.

Important Documents to Check Before Filing ITR

Experts advise taxpayers to verify all financial records carefully before submitting returns.

Documents You Should Match Before Filing

• AIS
• Form 26AS
• Form 16
• Bank statements
• Investment proofs
• Capital gains statements
• Interest certificates

Cross-checking documents helps identify errors early and significantly reduces the risk of notices or scrutiny later.

Digital Tax Systems Are Becoming More Strict

India’s tax system is becoming increasingly data-driven, meaning simply filing returns is no longer enough. Every detail declared in the ITR must align with official records available with the Income Tax Department.

Experts say taxpayers should now focus not only on timely filing but also on accuracy, transparency, and proper documentation.

As automated verification systems continue expanding, even small inconsistencies may attract attention. Careful review of financial records before filing can help taxpayers avoid notices, penalties, delayed refunds, and unnecessary stress during the tax filing season.

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