The most common misconception about Section 143(3) is that every taxpayer must go through it. The truth is the opposite: over 99% of income tax returns in India are processed without scrutiny assessment. Section 143(3) applies only to the small percentage of returns selected for detailed examination.
But if your return IS selected - either through compulsory criteria, CASS, or manual selection - the scrutiny assessment is mandatory. You cannot opt out. You must comply with the 143(2) notice, submit all requested documents, and cooperate with the assessment process. Non-compliance leads to best judgment assessment (Section 144), penalty (Rs 10,000 per failure), and even prosecution.
This blog answers the foundational question clearly: who must comply with Section 143(3), who is exempt, what triggers selection, and what businesses and professionals can do to reduce their scrutiny risk.
What Is Section 143(3) Scrutiny Assessment?
Section 143(3) of the Income Tax Act authorises the Assessing Officer to pass an assessment order after conducting a detailed scrutiny of the taxpayer's return. Unlike Section 143(1) (summary processing by CPC with automated adjustments), Section 143(3) involves human review of the return, supporting documents, and taxpayer explanations.
The process: (1) The taxpayer's return is selected for scrutiny (CASS/RMS/compulsory/manual), (2) A notice under Section 143(2) is issued to the taxpayer (this notice is mandatory before any 143(3) order), (3) The taxpayer submits documents and explanations through the e-filing portal (faceless assessment), (4) The AO examines all evidence, may issue further queries, (5) The AO passes a written assessment order under Section 143(3) determining the assessed income and tax payable/refundable.
The assessment order may: (a) accept the return as filed (no change), (b) make additions to income (if the AO finds undisclosed income or disallows deductions), (c) issue a demand notice under Section 156 for additional tax + interest, or (d) determine a lower income (rare, but possible if the AO finds the return over-reported income). Businesses using income tax notice services (know more) get complete scrutiny representation.
Key Terms You Should Know
Section 143(1) - Summary Assessment: The CPC processes the return automatically. Adjusts arithmetical errors, incorrect claims, and TDS mismatches. No human review. Result: intimation showing refund/demand/no change. This is what happens to 99%+ of returns.
Section 143(2) - Scrutiny Notice: The mandatory notice before scrutiny assessment. Must be issued within 3 months from the end of the FY in which the return was filed. Without this notice, no 143(3) order can be passed.
Section 143(3) - Scrutiny Assessment Order: The final order passed by the AO after examining all evidence. This replaces the 143(1) intimation for the selected return. Must be completed within 12 months from the end of the AY.
CASS (Computer-Assisted Scrutiny Selection): The AI/ML-based system that selects returns for scrutiny based on risk parameters: high deductions, income-expense mismatches, AIS discrepancies, unusual transactions, and sector-specific benchmarks.
RMS (Risk Management Strategy): The broader risk-scoring framework that assigns a risk score to every return. Returns above a threshold score are selected for scrutiny. Parameters change annually based on CBDT inputs.
Compulsory Scrutiny: Specific categories defined by CBDT where scrutiny is mandatory regardless of risk score. These are non-negotiable - the AO must issue a 143(2) notice for every return in these categories.
Faceless Assessment Scheme: Since 2019/2021, all scrutiny assessments (except search/survey and specified cases) are conducted online through the National e-Assessment Centre (NeAC). No physical meetings. All communication through the e-filing portal.
Limited Scrutiny: The AO examines only specific flagged issues (e.g., foreign tax credit, property sale). The scope is restricted - the AO cannot expand to other areas without higher authority approval.
Complete Scrutiny: The AO examines the entire return - all income sources, deductions, claims, and transactions. Triggered for compulsory categories or high-risk CASS selection.
Who Must Comply: The Six Compulsory Scrutiny Categories
For returns filed during FY 2024-25 (AY 2025-26), the CBDT has specified six categories where scrutiny is compulsory:
| # | Category | Details | Scrutiny Type |
|---|---|---|---|
| 1 | Survey cases (Section 133A) | Survey conducted on or after 1 April 2023. Return for the corresponding FY is mandatorily scrutinised - even if no irregularities are found in the return. | Complete scrutiny |
| 2 | Search/requisition cases (Sections 132/132A) | Search or requisition between 1 April 2023 and 31 March 2025. All linked persons and entities are scrutinised. For searches after 1 Sep 2024: scrutiny limited to AY 2025-26. | Complete scrutiny |
| 3 | ITR-7 filers with invalid exemption claims | Trusts/institutions filing ITR-7 claiming exemptions under 12A, 12AB, or 10(23C) without valid registration or with expired/revoked registration. | Complete scrutiny |
| 4 | Recurring additions above threshold | Cases where additions made in prior year assessments exceed Rs 50 lakh (metro cities) or Rs 20 lakh (non-metro) and were confirmed on appeal or not challenged. | Complete scrutiny |
| 5 | Intelligence/regulatory body flags | Cases flagged by DGIT (Intelligence), SFIO, ED, SEBI, RBI, or other regulatory agencies based on specific tax evasion intelligence. | Complete scrutiny |
| 6 | Specific CBDT directions | Any case where CBDT specifically directs scrutiny based on policy considerations or sector-wide compliance initiatives. | As directed by CBDT |
If your business falls into any of these six categories, scrutiny under Section 143(3) is mandatory. You cannot avoid it. The focus should be on preparation, documentation, and professional representation - not avoidance. For the Section 142(1) inquiry that often precedes scrutiny, see our Section 142(1) risk checklist (know more).
Who Is Generally Exempt from Section 143(3) Scrutiny?
The following taxpayers are not automatically subject to scrutiny (though they can be selected through CASS/RMS if their return triggers risk parameters):
| Taxpayer Type | Scrutiny Likelihood | What Keeps Them Exempt |
|---|---|---|
| Salaried individuals (single employer) | Very low - unless high-value transactions or AIS mismatches | Income fully covered by TDS (Form 16). Deductions standard (80C, 80D). No business income. AIS matches. |
| Small professionals (44ADA presumptive) | Low - if declaring 50%+ of receipts as profit and receipts below Rs 50 lakh | Presumptive return with standard profit declaration. No detailed books required. No high-value flags. |
| Small businesses (44AD presumptive) | Low - if declaring 8%/6% profit on turnover below Rs 2 crore | Presumptive return with standard profit. No audit requirement. No complex deductions. |
| Mid-size businesses (turnover Rs 2-10 Cr, digital) | Moderate - depends on CASS parameters and financial ratios | Consistent profit margins. AIS/26AS match. Tax audit with clean Form 3CD. No aggressive deductions. |
| Companies with statutory + tax audit | Moderate to high - larger companies have higher selection rates | Clean audit report (no qualifications). CARO reporting satisfactory. Transfer pricing compliant (if applicable). |
| NRIs with Indian income | Moderate - property sale, DTAA claims, and FTS/royalty attract scrutiny | Correct ITR form. DTAA treaty properly applied. TDS credits reconciled. No undisclosed Indian assets. |
Important: No taxpayer is permanently exempt from scrutiny. Any return can be selected through CASS/RMS. The exemption is probabilistic, not absolute. The lower your risk score, the lower your selection probability. Use statutory audit (know more) services for audit-quality documentation that reduces scrutiny risk.
The Legal Framework: How Section 143(3) Works
Step 1: Return Filed (Section 139/142(1))
The taxpayer files their ITR for the relevant AY. This is the starting point. Without a filed return, Section 143(2) notice cannot be issued (the AO must first issue 142(1)(i) directing the taxpayer to file).
Step 2: Selection for Scrutiny (CASS/RMS/Compulsory)
The CPC processes the return under 143(1). Simultaneously, the RMS system scores the return. Returns meeting compulsory criteria or exceeding the CASS threshold are selected for scrutiny.
Step 3: Section 143(2) Notice Issued (Mandatory)
The AO (or NeAC under faceless assessment) issues a notice under Section 143(2). This notice is mandatory before any assessment order under 143(3) can be passed. Without this notice, the entire assessment is void. The notice must be issued within 3 months from the end of the FY in which the return was filed.
Step 4: Document Submission and Hearings (Faceless)
The taxpayer submits all requested documents through the e-filing portal (e-Proceedings). The AO may issue questionnaires, request additional information, or seek clarifications. All communication is online under the faceless scheme.
Step 5: Assessment Order Under Section 143(3)
The AO passes the final assessment order. The order determines: assessed income, tax payable or refundable, interest under Sections 234A/234B/234C, and any penalty proceedings initiated. Must be completed within 12 months from the end of the AY.
Step 6: Demand or Refund (Section 156)
If additional tax is determined: a demand notice under Section 156 is issued. If the assessed income is lower (rare): a refund is processed. For demand management, see our Section 156 demand methodology (know more).
Timeline: Section 143(3) Assessment Calendar for AY 2025-26
| Milestone | Deadline | Notes |
|---|---|---|
| ITR filing (non-audit) | 31 July 2025 | ITR for FY 2024-25 (AY 2025-26) |
| ITR filing (audit cases) | 31 October 2025 | For businesses/professionals requiring tax audit |
| Section 143(2) notice issuance deadline | 30 June 2026 | 3 months from end of FY 2025-26 (in which returns were filed). Last date for the AO to issue scrutiny notice. |
| Assessment completion deadline (Section 143(3) order) | 31 March 2027 | 12 months from end of AY 2025-26. Extended by 12 months for TP cases. |
| Section 156 demand (if any) | With the 143(3) order | Demand notice issued simultaneously with the assessment order. |
| Appeal to CIT(A) (if disputing the order) | 30 days from receipt of order | Appeal filed online through the e-filing portal. |
Key implication: If you file your return on 31 July 2025 and do NOT receive a 143(2) notice by 30 June 2026, your return is safe from scrutiny for that AY. Check the portal regularly between January and June 2026 for any notices.
Documents Required During Section 143(3) Scrutiny
- ITR and computation of income (as filed + revised, if applicable)
- Books of accounts: trial balance, P&L, balance sheet, cash book, ledger
- Bank statements for all accounts (savings, current, FD, loan)
- Form 26AS / AIS / TIS (Annual Information Statement and Taxpayer Information Summary)
- TDS certificates: Form 16 (salary), 16A (non-salary), 16B (property), 16C (rent)
- Tax audit report (Form 3CA/3CB + 3CD) if applicable
- GST returns (GSTR-1, 3B, 9) for turnover cross-verification
- Investment proofs for all deductions: 80C (PF, LIC, ELSS), 80D (medical), 80E (education loan), 80G (donations)
- Property documents (purchase deed, sale deed, cost computation) if capital gains are involved
- Share/MF transaction statements if capital gains reported
- Loan agreements and interest certificates
- Details of all high-value transactions (SFT items)
- Transfer pricing documentation (Form 3CEB + TP study) if international transactions
- Explanation for any specific queries raised by the AO
143(1) vs 143(3): The Complete Comparison
| Parameter | Section 143(1) Summary Assessment | Section 143(3) Scrutiny Assessment |
|---|---|---|
| Nature | Automated processing by CPC. No human review. | Detailed human examination by AO. Document verification. |
| Selection | Every ITR goes through 143(1). Automatic. | Only selected returns (CASS/RMS/compulsory). Less than 1% of returns. |
| Prior notice | No prior notice. Intimation sent after processing. | Section 143(2) notice mandatory before the order. |
| Adjustments | Only arithmetical errors, incorrect claims (evident from return), and TDS mismatches. | All aspects of the return: income, deductions, losses, credits, and any item the AO deems necessary. |
| Timeline | Intimation within 9 months from end of FY in which return was filed. | Assessment order within 12 months from end of AY. |
| Outcome | Intimation: refund, demand, or no change. Automated. | Assessment order: assessed income determined. Demand under 156 if additional tax. Can trigger penalty proceedings. |
| Appeal | Rectification under 154 (for errors). No direct appeal against 143(1) intimation. | Appeal to CIT(A) under Section 246A within 30 days of order. |
| Faceless | Fully automated by CPC. No AO involvement. | Faceless Assessment Scheme - online, no physical meetings (except search/survey cases). |
What Triggers CASS/RMS Selection for Scrutiny?
Beyond the six compulsory categories, CASS/RMS selects returns based on risk parameters. While the exact parameters are confidential (CBDT does not publish them), the following are known triggers based on assessment patterns and professional experience:
- Large or unusual deductions: Chapter VI-A deductions significantly higher than typical for the income bracket
- AIS/26AS mismatches: income visible in AIS not reported in ITR (property, shares, interest, foreign remittances)
- High-value transactions: SFT entries (cash deposits > Rs 10L, property > Rs 30L, credit cards > Rs 10L) not adequately explained by reported income
- Abnormal financial ratios: profit margins significantly below industry average; sudden spikes or drops in turnover
- TDS credit discrepancies: TDS claimed in ITR exceeding 26AS credits
- Loss returns with high turnover: businesses showing persistent losses despite significant revenue
- International transactions: transfer pricing, foreign income, DTAA claims
- Specific sector flags: real estate, cryptocurrency, cash-intensive businesses
- ITR form mismatch: wrong ITR form used for the type of income
- Prior year scrutiny with additions: if the previous year's assessment resulted in significant additions, the current year is likely to be selected
For TDS return filing (know more) services that prevent TDS-triggered scrutiny, we handle the complete reconciliation.
How to Reduce Section 143(3) Scrutiny Risk
For taxpayers not in the compulsory categories, the following practices reduce CASS/RMS selection probability:
Practice 1: AIS/26AS reconciliation before filing. Every income item in AIS must be reported in the ITR. If an AIS entry is incorrect, use the AIS feedback mechanism to dispute it before filing.
Practice 2: Conservative deduction claims. Claim only deductions with complete documentation. Avoid aggressive tax positions that attract scrutiny flags.
Practice 3: Consistent financial ratios. Sudden drops in profit margin or spikes in expenses trigger RMS flags. Maintain consistency year-over-year. If a genuine change occurred (new investment, market downturn), document the reason in the return.
Practice 4: Correct ITR form and tax regime. Using the wrong form (e.g., ITR-1 when ITR-3 is required) is a processing flag. Selecting the wrong tax regime creates computational mismatches.
Practice 5: Clean tax audit report. For businesses with tax audit: a qualified Form 3CD (auditor's observations or qualifications) increases scrutiny probability. A clean audit report reduces it.
Practice 6: Timely TDS compliance. As a deductor: file all TDS returns on time with correct PAN and sections. As a deductee: ensure all TDS credits match 26AS before claiming.
Practice 7: GST-ITR turnover reconciliation. GST turnover (GSTR-1/3B) should match ITR turnover. Differences (exempt supplies, credit notes, timing) should be documented.
For comprehensive risk reduction, see our tax planning framework (know more).
Consequences of Section 143(3) Assessment
| Outcome | What Happens | Taxpayer's Options |
|---|---|---|
| No change (income accepted as filed) | AO passes order confirming the return. No additional tax. No penalty. | No action needed. Return is finally assessed. |
| Addition to income (disallowance or undisclosed income) | AO determines higher income. Demand notice under 156. Interest under 234A/B/C. | Accept and pay. Or appeal to CIT(A) within 30 days. |
| Penalty proceedings initiated (concealment or misreporting) | AO initiates penalty under Section 270A: 50% of tax on underreported income (misreporting) or 200% (underreported with concealment). | Separate penalty proceedings. Opportunity to be heard. Appeal available. |
| Prosecution (in extreme cases) | If the AO finds wilful evasion: prosecution under Section 276C (imprisonment 6 months to 7 years + fine). | Criminal proceedings. Legal representation required. Bail and defence. |
| Best judgment assessment (non-cooperation) | If taxpayer does not cooperate: AO assesses income based on available information (Section 144). Typically results in higher demand. | Appeal. But 144 orders are harder to challenge without documented cooperation. |
2026 Developments Affecting Section 143(3) Scrutiny
| 2026 Development | Impact on Scrutiny | What to Do |
|---|---|---|
| Income Tax Act 2025 (from April 2026) | Section 143 renumbered. Assessment framework remains substantially similar. Faceless assessment continues under the new Act. | For AY 2025-26: old Act applies. From AY 2026-27: familiarise with new section numbers. |
| CBDT compulsory scrutiny guidelines updated annually | The six categories for AY 2025-26 may change for AY 2026-27. New categories may be added based on compliance trends. | Monitor CBDT circulars (usually issued in May-June each year) for the latest compulsory categories. |
| AIS data expansion | More data sources feeding into AIS: property registrations, crypto exchanges, foreign remittances, high-value purchases. More matches = more CASS triggers. | Reconcile AIS proactively. Use AIS feedback for incorrect entries. Report all income sources. |
| AI/ML in CASS selection | CBDT is enhancing CASS with AI/ML models that identify anomalous patterns across years and sectors. Returns that were previously not flagged may now be selected. | Maintain consistent ratios. Avoid outlier deductions. Document legitimate deviations. |
| Budget 2026: penalty framework changes | Several penalties being converted to fees. Section 270A framework for underreporting may see procedural changes. Penalty amounts remain significant. | Accurate reporting remains the best defence. Penalty avoidance through compliance, not aggressive positions. |
Common Mistakes That Increase Scrutiny Risk
Mistake 1: Claiming deductions without documentation. Claiming Rs 1.5 lakh under 80C without maintaining investment proofs. CASS flags returns with high deductions relative to income.
Mistake 2: Not reporting capital gains from share/property transactions. AIS captures SFT data from stock exchanges and property registrars. Income visible in AIS but missing from ITR is the #1 CASS trigger.
Mistake 3: Using the wrong ITR form. Filing ITR-1 when business income or capital gains exist. CPC may process under 143(1) with errors, leading to demand + potential scrutiny.
Mistake 4: Filing loss return without tax audit. A business loss return without a tax audit (when turnover exceeds the threshold) is an immediate CASS flag.
Mistake 5: Not cooperating with 142(1) inquiry. A poor response to a 142(1) notice almost guarantees escalation to 143(2) scrutiny. Responding thoroughly at the 142(1) stage prevents 143(2) in most cases.
Penalties for Non-Compliance During Scrutiny
| Non-Compliance | Penalty / Consequence | Legal Provision |
|---|---|---|
| Not responding to 143(2) notice | Rs 10,000 per failure. Best judgment assessment under 144. | Section 271(1)(b) + Section 144 |
| Underreporting of income (found during scrutiny) | 50% of tax on underreported amount (misreporting). 200% if concealment/fraud. | Section 270A |
| Non-maintenance of books of accounts | Rs 25,000 penalty. Income assessed on best judgment. | Section 271A |
| Failure to comply with AO requests | Prosecution: imprisonment up to 1 year + fine. | Section 276D |
| Wilful tax evasion (discovered during scrutiny) | Prosecution: 6 months to 7 years imprisonment + fine + tax + interest + penalty. | Section 276C |
How Section 143(3) Connects with Other IT Sections
Section 143(3) does not operate in isolation. The scrutiny process intersects with: (1) Section 142(1) - preliminary inquiry often precedes scrutiny. (2) Section 143(2) - mandatory notice before any 143(3) order. (3) Section 144 - best judgment assessment if taxpayer does not cooperate with scrutiny. (4) Section 147/148 - reassessment if income escaped the original 143(3) assessment. (5) Section 156 - demand notice if the 143(3) order determines additional tax. (6) Section 246A - appeal against the 143(3) order. (7) Section 270A - penalty for underreporting discovered during scrutiny.
For tax planning services (know more) that prepare businesses for scrutiny-proof returns, we handle the complete compliance lifecycle.
Key Takeaways
Section 143(3) scrutiny is NOT mandatory for every taxpayer. Over 99% of returns are processed under 143(1) without scrutiny. Scrutiny applies only to returns selected through CASS/RMS or falling under CBDT's six compulsory categories.
The six compulsory categories for AY 2025-26 are non-negotiable: survey cases, search cases, invalid exemption claims (ITR-7), recurring high additions, intelligence flags, and CBDT-directed cases. Businesses in these categories must prepare for complete scrutiny.
For all other taxpayers, scrutiny risk is manageable: accurate returns, AIS/26AS reconciliation, conservative deductions, consistent financial ratios, and clean audit reports reduce CASS/RMS selection probability significantly.
The scrutiny process is faceless (online only, no physical meetings). Section 143(2) notice is mandatory before any 143(3) order. Assessment must be completed within 12 months from end of AY. Non-cooperation leads to best judgment assessment and penalties.
If your return IS selected for scrutiny, engage a CA immediately. Professional representation, structured documentation, and timely response at each stage significantly improve outcomes.
Need Help With Scrutiny Assessment or Prevention?
Whether you have received a 143(2) notice and need professional representation, or you want to audit your return for scrutiny risk before filing - our team handles both.
Explore our income tax notice services (know more) and tax planning services (know more) for scrutiny-proof compliance across Pune, Mumbai, Delhi, and all-India.
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