Income Tax Act 2025 Audit Transition — Practical Playbook for FY 2026-27
The Income Tax Act 2025 replaces the Income Tax Act 1961 with effect from 1 April 2026 (FY 2026-27 / AY 2027-28). For tax auditors signing reports under Section 44AB (or its IT Act 2025 successor), the transition affects three things — Form 3CD references, the citations in working papers, and the way TDS / TCS computations work across the boundary.
This is not a comprehensive walkthrough of every change. The IT Act 2025 simplification consolidated many provisions and renumbered sections; a comprehensive comparison runs to hundreds of pages. This is a practical transition playbook for what tax auditors need to do in the next 12 months to be ready for the first audit signed under the new framework.
What changed (and what didn't)
The IT Act 2025 is a structural simplification rather than a substantive rewrite. The headline changes:
- The Act has been renumbered and rationalised — earlier provisions split across sections are consolidated.
- TDS provisions have been consolidated — Sections 192 to 196D and various deductors-and-rates schedules have been re-organised into a smaller number of sections with rate tables in schedules.
- The "previous year" / "assessment year" framework has been retained (despite drafts that considered abolishing the AY).
- Section 44AB has been retained as a recognisable concept with broadly the same thresholds, but the section number changes in the new Act.
What stays the same:
- The basic tax-audit threshold structure (₹1 crore business turnover / ₹50 lakh professional gross receipts, with cash-test relief for ₹10 crore business limit)
- The 30 September due date for tax audit report filing
- The Form 3CD as the prescribed statement of particulars (with revised numbering)
- The penalty under Section 271B (now renumbered) for failure to get accounts audited
- The substance of Section 269ST (₹2 lakh cash receipt), 40A(3) (₹10K / ₹35K cash expense), 269SS / 269T (₹20K loan / deposit) — re-enacted with new section numbers
The timing — which year does which Act govern?
This is the most-asked question. The simple rule:
- FY 2025-26 (AY 2026-27 — the year being audited in 2026) — IT Act 1961 applies. Tax audit reports signed in calendar 2026 (for FY 2025-26) use Section 44AB and the old Form 3CD.
- FY 2026-27 (AY 2027-28 — the year being audited in 2027) — IT Act 2025 applies. Tax audit reports signed in calendar 2027 (for FY 2026-27) use the new Act references.
So tax auditors signing in 2026 are still on IT Act 1961. The IT Act 2025 framework starts mattering for the FY 2026-27 audit cycle, which runs September 2026 to September 2027.
This gives auditors a clear 12-month runway to update working papers, engagement letters, and Form 3CD references.
What tax auditors must update in the next 12 months
1. Engagement letters under SA 210
Engagement letters issued after 1 April 2026 for FY 2026-27 audits should reference the IT Act 2025 framework. Specifically:
- Replace "Section 44AB of the Income Tax Act 1961" with the corresponding section under IT Act 2025
- Update references to Form 3CD and Form 3CB to the IT Act 2025 successor forms (likely retained with same names — CBDT to notify)
- Reference the IT Act 2025 penalty under the successor to Section 271B
A practical drafting note — to avoid two parallel engagement letter templates, draft a single letter that references both Acts ("under Section 44AB of the Income Tax Act 1961 / corresponding provision of the Income Tax Act 2025 as applicable to the relevant financial year").
2. Form 3CD working papers
Form 3CD has 41 clauses (currently). The IT Act 2025 will likely retain the form structure with renumbered section references in each clause. For example:
- Clause 21(d) currently references Section 40A(3) — IT Act 2025 will reference the successor section
- Clause 31(b)(a)-(d) currently references Section 269ST — IT Act 2025 successor
- Clause 31(a) and (c) currently reference 269SS / 269T — IT Act 2025 successors
CBDT will issue a notification revising the form. Tax-audit working papers should reference both — the IT Act 1961 section AND the IT Act 2025 successor — for the audits straddling the transition.
3. TDS / TCS reconciliation
The TDS / TCS framework has been consolidated in IT Act 2025. The Sections 192 (Salary), 194 series (other payments), 195 (non-resident), 196 series, and Section 206C (TCS) are re-organised. For tax auditors:
- TDS reconciliation against 26AS continues to use the same logic
- The rate tables move to schedules in the new Act
- New section numbers in Form 3CD clauses 27 (TDS), 27A (TCS) and the deductors' summary
The substantive amounts and rates are largely unchanged in IT Act 2025 (Finance Act 2025 amendments separately apply).
4. Section 269ST / 40A(3) / 269SS / 269T — substance unchanged, numbers change
These four anti-cash provisions are central to the auditor's job — they trigger penalty exposure under Section 271DA / Section 271D / Section 271E, and they're the primary disallowance lever under Section 40A(3).
IT Act 2025 retains the substance of all four with the following changes:
| IT Act 1961 | IT Act 2025 (illustrative) | Substance |
|---|---|---|
| Section 269ST | [renumbered] | ₹2 lakh cash receipt limit retained |
| Section 40A(3) | [renumbered] | ₹10K / ₹35K transporter limit retained |
| Section 269SS | [renumbered] | ₹20K loan / deposit accept limit retained |
| Section 269T | [renumbered] | ₹20K loan / deposit repay limit retained |
| Section 271DA | [renumbered] | Penalty = amount received |
| Section 271D / 271E | [renumbered] | Penalty = amount accepted / repaid |
The Cash Transaction Compliance Checker is being updated to surface both IT Act 1961 sections (for FY 2025-26 and earlier) and IT Act 2025 sections (for FY 2026-27 onwards). For working paper purposes, document both citations during the transition year.
5. ICAI 60 tax audit cap — runs in parallel
Separately from the IT Act 2025 transition, the ICAI 60 Tax Audit Cap kicks in from 1 April 2026 (FY 2026-27) under the Chartered Accountants (Limit on Number of Tax Audits) Guidelines 2025. See the ICAI 60-cap calculator for the per-partner counting logic.
Note these are two separate regulatory events that converge on the same date:
- IT Act 2025 is statutory law (Parliament)
- ICAI 60-cap is a professional regulation (ICAI Council under Section 15(2)(fa) of the CA Act 1949)
Both take effect 1 April 2026, but they're independent.
What's still uncertain
As of May 2026, the following are still being clarified by CBDT / ICAI:
-
Form 3CD revised numbering — CBDT notification expected before September 2026 (i.e., before AY 2026-27 filings, which still use the old form, but the new form for AY 2027-28 needs to be issued earlier).
-
Transitional provisions for assessment years straddling the boundary — what happens to ongoing scrutiny of FY 2024-25 audits when those proceedings extend into FY 2026-27? The general rule is the law in force on the date of the assessment proceeding governs — but specific transitional provisions in IT Act 2025 may modify this.
-
TDS rate changes — separate from the structural consolidation, Finance Act 2025 amendments to TDS rates (if any) apply. Track Finance Bill 2025 notification and CBDT TDS rate-card.
-
ICAI Implementation Guide on IT Act 2025 — ICAI typically issues an Implementation Guide for each new tax-audit-affecting law. Expected publication mid-2026.
-
GST audit / GSTR-9C — these are unchanged by IT Act 2025 (different statute). But many tax audit firms also do GSTR-9C — the workflow remains as before.
Practical action items — 12-month timeline
June - September 2026 (now through audit season)
- Sign FY 2025-26 tax audits under IT Act 1961 references (no change to current practice)
- Allocate one partner / manager to monitor CBDT notifications for the IT Act 2025 transition
- Subscribe to ICAI's Tax Audit Committee notifications
October - December 2026 (post audit season)
- Review CBDT's revised Form 3CD (expected around this time)
- Update working paper templates with dual-Act references
- Draft new engagement letter language for FY 2026-27 audits
- Run an internal session for all audit staff on the IT Act 2025 changes affecting tax audit
January - March 2027 (preparation)
- Update the firm's audit programme to reference IT Act 2025 sections
- Update Form 3CD pre-fill templates (if using audit tech)
- Re-train junior staff on the dual-citation working paper convention
April 2027 onwards (live)
- All new tax audit engagements for FY 2026-27 reference IT Act 2025
- Files closed for FY 2025-26 retain IT Act 1961 references
How CORAA helps with the transition
CORAA's Form 3CD pre-fill module is being updated to handle both Acts. The first 1.5 years of operation will surface both IT Act 1961 sections (for FY 2025-26 audits) AND IT Act 2025 successors (for FY 2026-27 audits going forward). This avoids the operational pain of maintaining two separate working paper templates during the transition.
The Cash Transaction Compliance Checker calculator already references both Acts — IT Act 1961 sections shown with notation "see also IT Act 2025 corresponding provision."
For tax audit volume planning, the ICAI 60-cap Calculator helps plan the FY 2026-27 engagement load. The combination of IT Act 2025 transition + 60-cap kicking in + Peer Review Phase IV deadline (31 Dec 2026) makes FY 2026-27 the most regulation-heavy year for Indian tax auditors in recent memory.
Bottom line
The IT Act 2025 transition is structural — same substance, new section numbers. Tax auditors get a 12-month runway to update engagement letters, Form 3CD references, and working paper templates. The cash transaction limits (₹2 lakh, ₹10K, ₹20K) and the penalty mechanisms are retained. The 60-cap and the IT Act 2025 transition take effect on the same date (1 April 2026) but are independent.
For partners planning FY 2026-27:
- Watch for CBDT's revised Form 3CD notification
- Update engagement letter templates by Q3 2026
- Train staff on dual-citation working paper convention
- Run the 60-cap calculator to confirm tax audit capacity for FY 2026-27
- Re-confirm peer review readiness if the firm is in Phase IV
The Cash Transaction Compliance Checker and the ICAI 60-cap Calculator are the two CORAA tools most directly relevant to this transition.
Try CORAA → Built to handle Indian tax audit transitions cleanly — dual-Act references where the audit straddles the boundary, Form 3CD pre-fill from ledger, Section 269ST / 40A(3) automatic surfacing. Talk to us · See pricing · Browse calculators.