A Section 143(1)(a) notice is the automated, pre-intimation "show-cause" issued by the Centralised Processing Centre (CPC) of the Income Tax Department under the proviso to Section 143(1) of the Income-tax Act, 1961, before any adjustment is made to the returned income during Summary Processing. In effect, it is the department's prior-intimation of proposed adjustments — generated by CPC after comparing the filed ITR with Form 26AS, the Annual Information Statement (AIS), the Taxpayer Information Summary (TIS), tax-audit report (Form 3CD where uploaded), and audit / accounting information otherwise available — flagging one or more prima-facie inconsistencies that, if not reconciled by the taxpayer within 30 days of communication, will be carried into the final Section 143(1) intimation as an adjusted and payable amount. It is critical to understand that a 143(1)(a) notice is not scrutiny under Section 143(2) and is not a substantive assessment — but it is equally critical to understand that silence beyond 30 days is construed as agreement, and the proposed adjustment becomes demand in the Section 143(1) intimation, triggering Section 220(2) interest and recovery.
Under the proviso to Section 143(1), six specific categories of prima-facie adjustments can be proposed — (i) any arithmetical error in the return; (ii) any incorrect claim which is apparent from any information in the return (for example, deduction claimed at a higher percentage than permitted by statute); (iii) disallowance of loss claimed if the return of the previous year, for which set-off is sought, was furnished beyond the due date under Section 139(1); (iv) disallowance of expenditure or increase in income indicated in the audit report but not taken into account in computing the total income in the return; (v) disallowance of deduction claimed under Sections 10AA, 80-IA, 80-IAB, 80-IB, 80-IC, 80-ID, or Section 80-IE, if the return is furnished beyond the due date under Section 139(1); and (vi) addition of income appearing in Form 26AS / 16 / 16A / AIS which has not been included in the return. Before any such adjustment is given effect to, the taxpayer is mandatorily issued a Section 143(1)(a) notice with the proposed adjustment detailed, giving an opportunity to explain, reconcile, or accept — the response is submitted through the e-filing portal (Pending Actions → e-Proceedings → Response to Outstanding Demand / Notice).
Our Section 143(1)(a) Notice Response Services cover the full lifecycle — from retrieval and decoding of the exact nature of proposed adjustment (each category of the proviso has a different defence playbook), full reconciliation of the ITR with Form 26AS / AIS / TIS / Form 16 / broker statements / GST turnover / bank data / tax audit report, assessment of merits (is the department's flagged adjustment valid, partially valid, or entirely wrong?), drafting and uploading a technically-sound point-wise response through the e-proceedings module with supporting evidence and reconciliations, voluntary revision of the return under Section 139(5) where material errors are genuinely identified, follow-up on the final Section 143(1) intimation, rectification under Section 154 where the intimation still carries errors, first-appeal before CIT(A) under Section 246A within 30 days of the intimation where material demand stands, and Section 220(6) stay against recovery — so the proposed adjustment is either dropped or minimised, and the final intimation carries no avoidable tax demand.
Arithmetical errors in the return — addition / subtraction / totalling mistakes apparent on face of ITR.
Claims apparently incorrect from information in the return — deduction exceeding statutory limit, wrong schedule.
Loss claimed in current year for set-off where the prior year's return was filed beyond the Sec 139(1) due date.
Disallowance indicated in the tax audit report (Form 3CD) but not taken into account in computing total income.
Specified profit-linked deductions denied where the return is filed beyond the Section 139(1) due date.
Income reflected in Form 26AS / Form 16 / 16A / AIS but not included in the return.
Section 143(1)(a) is pre-intimation — CPC must issue it before making any adjustment.
Response required within 30 days of communication of the notice on the e-filing portal.
Silence beyond 30 days = deemed agreement; adjustment flows into final 143(1) intimation.
CPC must complete processing under Section 143(1) within 9 months from end of FY of filing.
Taxpayer can agree with the adjustment, disagree with evidence, or file a revised return u/s 139(5).
Most 143(1)(a) notices today are 26AS / AIS mismatch driven — reconciliation is primary defence.
Post-2017 amendment captures disallowance in 3CD but not in computation — major source of adjustments.
Where the final 143(1) intimation carries demand, 154 rectification or 246A first appeal is available.
Identifying the exact clause triggered, root-cause analysis, and AIS / 26AS / 3CD / books reconciliation.
Upload point-wise response on e-proceedings with supporting evidence and case-law where needed.
Final Section 143(1) intimation review, rectification, first appeal, and stay where needed.
Clause (vi) mismatches — income in 26AS / AIS not in ITR — reconciled and responded with evidence.
Clause (iv) disallowances — 40(a) / 43B / 40A(3) / 36(1)(va) adjustments from tax audit report.
Clause (v) defence where profit-linked deductions are proposed for denial on timely-filing grounds.
Clause (iii) — brought-forward loss set-off denied due to prior-year late filing — documentary defence.
Section 139(5) revised return where genuine errors are identified — correcting before 143(1) finalisation.
Final intimation analysis, Section 154 rectification, and first-appeal strategy where demand persists.
Protection of refund against Section 245 adjustment and prompt follow-up on refund release.
Section 220(6) stay of demand and first appeal before CIT(A) under Section 246A where demand stands.
AIS / 26AS reflects dividends / interest / CG / rent / fees not declared in ITR — reconciliation needed.
Tax auditor's 3CD captures disallowance that the computation did not pick up — CPC has flagged it.
10AA / 80-IA / 80-IB / 80-IC deduction proposed to be denied for alleged late-return filing.
Brought-forward business / capital-gains loss being denied — prior year's return-date dispute.
CPC flags 80C / 80D / HRA / LTA claim exceeding the applicable statutory or policy cap.
Schedule-wise entries do not sum to the return summary — purely arithmetical but material exposure.
Notice flags two or more different categories — each requires a separate point-wise response.
30-day response window running out — expert preparation and upload needed to avoid deemed acceptance.
Identify the clause triggered, read the computation, and map quantum of adjustment.
Tie out ITR with AIS / 26AS / Form 16 / 3CD / books and identify the root cause.
Agree / disagree / partially agree / revise the return — choose the cleanest remedy.
Point-wise e-proceedings response with evidence, reconciliations, and supporting law.
Track Sec 143(1) intimation, rectification, CIT(A) appeal, and stay where needed.
Partner with our CAs for end-to-end Section 143(1)(a) Notice Response Services — reconciliation, portal response, revised return, and follow-up on final intimation — all under one roof.
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