The idea that undeclared income can stay hidden has not been realistic for several years. Over 40 categories of entities are required by law to report financial transactions to the Income Tax Department — automatically, in machine-readable format, cross-referenced to your PAN. All of this flows into the Annual Information Statement (AIS) which you can check on the e-filing portal at any time.

1. AIS and ITR Mismatch — The Most Common Trigger

When any amount appears in your AIS and has no corresponding entry in your ITR, the system flags it. FD interest declared by the bank but not in your Schedule OS. Dividend reported by the company but missing from your return. Capital gain captured by the broker but no Schedule CG filed. Each of these creates an automated mismatch that generates either a 143(1) intimation or, for larger amounts, a 143(2) scrutiny notice.

2. TDS Credit Claimed Without Corresponding Income

This is one of the most reliable notice triggers. If a client deducted TDS under Section 194J on professional fees they paid you — that TDS appears in your Form 26AS. If you claim the TDS credit in your ITR but do not declare the corresponding income, the system immediately spots the contradiction: tax was deducted, therefore income was earned, but no income appears in the return. This inconsistency is flagged without exception.

3. High Value Cash Deposits — Source Not Explained

Cash deposits aggregating ₹10 lakh or more in savings accounts (or ₹50 lakh in current accounts) across all banks in a year are reported to the department. If such deposits appear in AIS but your declared income cannot plausibly account for them — the department wants an explanation. The gap between declared income and apparent financial capacity is the red flag.

4. Capital Gains Not Declared

Your broker and the depository report every sale. If you sold shares or redeemed mutual funds with a gain — the transaction appears in AIS. If Schedule CG in your ITR is empty or shows a different figure — the mismatch triggers a notice. Short-term gains on equity post-July 2024 are taxed at 20% and long-term at 12.5% — both are taxable and both are captured in the system.

5. GST Turnover vs ITR Business Income

If you file GST returns showing ₹50 lakh in sales but your ITR declares ₹20 lakh in business income — the department’s cross-verification system immediately identifies the contradiction. GSTN data flows into the AIS, and a ₹30 lakh gap between GST turnover and declared business income is one of the strongest scrutiny triggers in current practice.

6. Excessive or Ineligible Deductions

Section 80C claims of ₹1.5 lakh without matching investment data in AIS. HRA claims in cities where rent payment evidence is thin. Deductions for house loan interest without corresponding loan data in AIS. The system cross-verifies claimed deductions against available data — unusually high deductions relative to income patterns attract attention.

7. Lifestyle Inconsistent with Declared Income

Credit card annual spend of ₹12 lakh on a declared income of ₹5 lakh. Property purchase of ₹60 lakh in the same year income of ₹8 lakh was declared without any loan data. The system compares financial behaviour with declared capacity — significant mismatches create risk scores that trigger scrutiny selection.

8. Prior Year Issues Not Resolved

An outstanding demand from a previous assessment year that was never paid or challenged. A mismatch from a prior year that was flagged but never addressed. These create a compliance risk score that affects how the current year’s return is processed. Clean prior years mean your current return enters processing with a lower risk flag.

9. CASS — Computer Assisted Scrutiny Selection

Beyond targeted flags, the department’s CASS system runs AI-driven risk parameters across all filed returns to select a percentage for scrutiny annually. Parameters include: high refund claims, high deductions relative to income, sharp decline in gross profit, significant international transactions, increase in expenditure disproportionate to revenue, transactions with non-filers. Even correctly filed returns can be selected if they fit a pattern that the algorithm identifies as higher risk.

10. Compulsory Scrutiny — CBDT Mandatory Categories

Separate from CASS, CBDT issues annual guidelines specifying categories of returns that must be selected for complete scrutiny regardless of risk scores. For FY 2026-27 (returns filed in FY 2025-26), the CBDT circular dated June 4, 2026 (F.No.225/56/2026/ITA-II) identifies six mandatory categories:

• Returns of taxpayers covered under a survey under Section 133A conducted on or after April 1, 2024
• Returns where search or requisition under Sections 132/132A was carried out on or after September 1, 2024
• Cases where registration under Section 12A, 12AB, or 10(23C) was not granted, cancelled, or withdrawn — and exemption was still claimed
• Cases where the same addition (e.g. expense disallowance, transfer pricing adjustment) has been made in multiple prior years and the taxpayer has not challenged it
• Cases with specific tax evasion information received from enforcement agencies
• Cases involving international transactions and transfer pricing above prescribed thresholds

If you or your business falls into any of these categories — compulsory scrutiny is certain, not a risk. Prepare documentation proactively before the scrutiny notice arrives.

A significant shift that most taxpayers are not fully aware of: since the introduction of the Faceless Assessment Scheme, all scrutiny proceedings (143(2)) are handled through the National Faceless Assessment Centre (NaFAC) — not your local Assessing Officer. The AO assigned to your case is selected randomly from a national pool. There is no physical interaction, no office visits, and no direct relationship between you and the AO handling your matter.

What this means practically:

• All notices and responses happen through the e-filing portal’s e-Proceedings section
• Documents are submitted digitally — no physical submission
• Hearings, if required, are conducted via video conference
• Your jurisdictional AO’s name or location is irrelevant for faceless assessments
• The assessment order must be completed within 12 months from the end of the AY — for AY 2026-27, by March 31, 2028

Case 1 — Employer’s TDS Error Triggered the Notice (Not the Taxpayer’s Fault)

Arun (Pune, software engineer) — always filed correctly based on Form 16. In AY 2025-26 he received a 143(1) intimation with a ₹31,000 demand. His employer had filed a quarterly TDS return with an error — one quarter’s entry did not match between Form 26AS and Arun’s declared salary figure.

We obtained Form 16 Part A from the employer, identified the discrepancy, and the employer filed a revised TDS return correcting the error. Arun submitted his e-Proceedings response with the corrected Form 16 and the revised TDS return acknowledgement. Demand was reversed to zero.

Lesson: A notice does not always mean you made an error. Employer-side TDS filing mistakes are a common and entirely avoidable cause.

Case 2 — CASS Selection Despite Correct Filing

Kavita (Delhi, architect with freelance income) received a 143(2) scrutiny notice. Her return was correctly filed — all income declared, all deductions supported. She had been selected by the CASS algorithm because her professional income varied significantly year-on-year (a pattern the algorithm treats as higher risk) and she claimed substantial home office deductions.

The entire response was handled online through e-Proceedings. We submitted project contracts, bank statements showing income receipts, and property ownership documents supporting the home office claim. The AO issued an assessment order confirming her return as filed. No additional demand. The process took four months from notice to closure.

Lesson: A 143(2) scrutiny notice does not mean something is wrong. For correctly filed returns with good documentation, it resolves without any addition.

Case 3 — GST vs ITR Gap — ₹28 Lakh Addition Proposed

A Delhi-based interior designer’s GST returns showed ₹42 lakh in annual turnover. His ITR declared ₹14 lakh in business income. The ₹28 lakh gap triggered a 143(2) scrutiny notice with the AO proposing to add ₹28 lakh to his income.

The explanation was legitimate: ₹18 lakh of the GST turnover was recovered materials cost (pass-through — not his income), and ₹10 lakh had been declared but in a different schedule. We provided the project breakdown, material purchase invoices, and a reconciliation statement. AO accepted the explanation after a video conference hearing. Addition was reduced to ₹3 lakh relating to a minor schedule error. Tax on ₹3 lakh — far less than the initially proposed ₹28 lakh.
🔗 Under-Reporting of Income Notice — Penalty, Immunity & Reply Guide

1. 1Verify It Is Genuine — Check the DIN
   Every authentic Income Tax notice carries a 20-character Document Identification Number (DIN). Verify it at incometax.gov.in → Verify Your Notice. The notice must also be accessible in your e-Proceedings section on the portal. If it does not appear there — treat it as fraud.
2. 2Identify the Section and Deadline
   Read the notice carefully. Note: which section (143(1), 143(2), 148A, etc.), the Assessment Year it covers, the specific issue raised, the exact response deadline, and the notice reference number. These four things determine everything else.
3. 3Download AIS and Compare with Your ITR
   Login → AIS → download Annual Information Statement and Taxpayer Information Summary for the relevant AY. Compare the specific entry mentioned in the notice against your filed ITR. Identify where the gap is — or confirm that the AIS entry itself is incorrect.
4. 4Decide — CA or Self-Handle
   Simple cases (FD interest missed, minor dividend gap, small demand under ₹25,000) can often be handled personally. Scrutiny (143(2)), reassessment (148/148A), penalty (270A), or any amount above ₹1 lakh — engage a CA. One consultation to understand the situation is worth doing regardless of eventual complexity.
5. 5Collect Documents and — If Needed — Pay Tax and File Revised ITR
   Gather all supporting documents relevant to the specific income or deduction in question. If income was genuinely missed and the revised ITR window (December 31) is still open — pay Self-Assessment Tax via Challan 280 first, then file the revised ITR. Proactive correction eliminates penalty risk.
6. 6Submit Response via e-Proceedings
   incometax.gov.in → e-Proceedings → your notice → Submit Response → write a clear, point-by-point reply → attach supporting documents as PDF → submit → save the acknowledgement number. Every response must go through the portal — email responses, physical submissions, and telephone calls have no legal validity.
7. 7Follow Up
   Check e-Proceedings status every 2–3 weeks. If the AO requests additional information or schedules a hearing — respond within the given time. Cases with complete documentation and prompt engagement typically close faster than those with partial responses and follow-up requests.

1. Download and review AIS before filing every ITR — every year, before July 31. Whatever appears in your AIS should appear in your ITR. This single habit eliminates the majority of mismatch-driven notices.
2. Collect interest certificates from every bank in April — all FDs, all savings accounts, all banks. Every interest amount, regardless of size. Never rely on memory across multiple accounts.
3. Track capital gains in real time — record every share sale and mutual fund redemption at the time of transaction. Reconstructing gain calculations eight months later from broker statements under deadline pressure is error-prone.
4. Keep GST returns and ITR income figures reconciled — if you are GST-registered, the difference between your GSTR turnover and your declared business income must be explainable. Prepare a reconciliation note at year-end before filing either return.
5. Check AIS again in October — after your July filing. New entries sometimes appear as reporting entities submit their data late. If you find something missed — December 31 is the revised ITR deadline. Use it proactively.
6. Keep records for at least 7 years — bank statements, investment proofs, property purchase and sale documents. Section 148 can reopen assessments up to 10 years in serious cases. Documents from seven years ago may be the only thing that closes a reassessment notice.

Assuming the email notification is the notice:
The department sends email and SMS alerts to tell you that something has been posted to your portal. The email is not the notice itself — the actual notice is on the e-filing portal under e-Proceedings. The deadline runs from the date on the portal notice, not from when you received the email. Check the portal immediately on receiving an alert.

Calling the numbers mentioned in suspicious “notices”:
Genuine notices do not ask you to call a phone number. They do not threaten immediate arrest. They do not request payment via UPI or crypto. Any notice making these demands is fraudulent. Report to cybercrime.gov.in and ignore completely.

Responding to a 143(2) scrutiny notice with only a letter:
A written letter or email to the AO has no legal standing in the faceless assessment system. All responses must be submitted through e-Proceedings. A response submitted anywhere else is treated as no response — and ex-parte proceedings follow.

Waiting until the deadline day:
Portal technical issues are common on deadline days — high traffic, slow uploads, session timeouts. Submit at least 3–5 days before the deadline. If you genuinely need more time, request an extension before the deadline — not on the deadline day.