10 Warning Signs for a Tax Audit

The income-tax department uses Computer Assisted Scrutiny Selection and AI-driven risk profiling to flag returns for scrutiny under Section 143(2). The strongest signals are mismatches between ITR and Form 26AS or AIS, sudden income swings, large cash transactions, unreported foreign assets, disproportionate refund claims, high-value SFT items, repeated business losses, GST-income-tax turnover gaps, unusual deductions, and below-circle-rate property purchases. Clean reconciliation and documentation are the practical defence.

Mayank Wadhera

Published: 13 Sept 2023

Updated: 16 May 2026

4 min read

The income-tax department's CASS (Computer Assisted Scrutiny Selection) system and the post-Finance Act 2026 AI-driven risk-scoring model do most of the audit selection now. Manual selection is reserved for high-value cases. Knowing the signals that push your return into scrutiny lets you correct course before the next filing season and reduces the chances of a Section 143(2) notice landing in your inbox.

Signal 1: Mismatch with Form 26AS or AIS

Any divergence between the income or TDS in your ITR and what appears in Form 26AS or the Annual Information Statement (AIS) is the easiest trigger. The system compares the two automatically. Always download the AIS, run a TIS reconciliation and either accept or contest each line item before filing.

Signal 2: Sudden Spike or Drop in Income

A 60-80% year-on-year change without a clear narrative — sale of capital asset, business closure, ESOP exercise, severance — looks anomalous to the system. If a swing is unavoidable, document the cause crisply in your return and keep supporting evidence ready.

Signal 3: Large Cash Transactions

High-value cash deposits, purchase of jewellery in cash, cash sale of immovable property, or cash payments crossing the Section 269ST limit all light up the scrutiny model. Use banking channels for all material transactions and ensure Form 60/61 compliance for any unavoidable cash event.

Signal 4: Foreign Asset or Income Reporting Gaps

Schedule FA, Schedule FSI and Schedule TR must report foreign bank accounts, foreign shares, foreign rental income and tax credits. The Black Money Act regime carries 30% tax plus 90% penalty for undisclosed foreign assets. Even a forgotten US 401(k) or Singapore CPF balance can trigger serious action.

Signal 5: Disproportionate Refund Claims

Refund claims that look out of line with the historical pattern of the taxpayer — particularly when funded by sudden TDS spikes or aggressive 80C/80D/HRA claims — are flagged. Salaried taxpayers claiming large home-loan interest under 24(b) without matching property declaration are a common case.

Signal 6: High-Value Transactions in SFT

Banks, mutual funds, registrars and high-end retailers report Specified Financial Transactions (SFT) to the department. Common triggers:

Mutual fund investments above ₹10 lakh in a year per AMC.
Credit card spends above ₹10 lakh in a year.
Cash deposits above ₹10 lakh in savings accounts in a year.
Sale or purchase of immovable property above ₹30 lakh.
Foreign remittances under LRS above the prescribed threshold.

Signal 7: Business Loss Carried Forward Repeatedly

Continuous losses for 3-5 consecutive years, especially when paired with a comfortable lifestyle, raise the question of whether the activity is genuinely a business or a tax-loss vehicle. Maintain audited financials, segment-wise reasoning and a clear path to profitability.

Signal 8: GST-Income-Tax Turnover Mismatch

Your turnover in GSTR-3B aggregated for the year is now reconciled with your business income in the ITR. Any unexplained gap — even ₹10-20 lakh — gets flagged. Keep a written reconciliation showing exempt supplies, schedule III items and accounting timing differences.

Signal 9: Unusual Deductions or Donations

Section 80G donations to little-known trusts, Section 35 scientific research deductions, and politically charged donations are all monitored. The receiving entity must be listed on the income-tax portal; otherwise, your deduction collapses on scrutiny.

Signal 10: Real Estate Transactions Out of Line

Property purchased significantly below the circle rate (stamp duty value) attracts Section 56(2)(x) deemed-income provisions. Sale of property without proper capital-gains computation or without claiming exemptions correctly under Sections 54/54EC/54F is another classic trigger.

Building a Pre-Filing Self-Audit

The best defence against scrutiny is a 30-minute self-audit before you click Submit on your ITR. Walk through your AIS line by line — accept, modify or reject each item with documentary support. Compare your declared income against last year's pattern and document any significant deviation. Cross-check your GST turnover, TDS Form 26AS and bank statement aggregates against your ITR schedules. The goal is not to look smaller; it is to look fully reconciled.

Step 1: Download AIS and TIS, reconcile every line item with documents.
Step 2: Run a year-on-year P&L delta and document any swing above 25%.
Step 3: Reconcile GST turnover with ITR business income, schedule III adjustments included.
Step 4: Verify Schedule FA reporting for every foreign account or asset.
Step 5: Keep a self-audit working paper file for at least seven years.

Conclusion

CASS and AI risk-scoring do not punish complexity — they punish unexplained anomalies. Reconcile AIS and 26AS, document large swings, route cash through banking channels, report foreign assets honestly, and align GST with income tax. Do those five things and you take yourself out of the scrutiny shortlist for most filing seasons.

Frequently Asked Questions

Does a scrutiny notice mean wrongdoing?

No. A scrutiny notice under Section 143(2) only means the department wants to examine your return more closely. Many notices are resolved with documentation. Only when the assessment finds underreporting or misreporting do penalty proceedings under Section 270A start.

How can I reduce my chances of being picked?

Reconcile AIS and Form 26AS before filing, document any large income swings, route material transactions through bank accounts, report foreign assets fully in Schedule FA, and keep a GST-income-tax turnover reconciliation. These five habits remove most of the AI-driven red flags.

What is the time limit to issue a scrutiny notice?

Under current law, a notice under Section 143(2) for an assessment year must be served within three months from the end of the financial year in which the return was furnished. Reassessment under Section 148 has a separate, longer window based on the income alleged to have escaped assessment.

Should I respond to a notice on my own?

Routine Section 143(2) notices and faceless assessment queries can often be answered with clean documentation. For Section 148 reassessments, Section 271AAC or 270A penalty notices, or anything involving foreign assets, engage a chartered accountant or tax counsel before filing your response.