| 📅 Updated as on: 11 May 2026 | ⚡ Subject to amendment — verify at incometax.gov.in |
If you have been filing income tax returns in India for even one year, you know the drill: income earned in the Previous Year is assessed in the Assessment Year. FY 2024-25 income = AY 2025-26 return. It was confusing, it was counterintuitive, and it has been the source of more taxpayer errors than almost any other concept in Indian tax law.
From 1 April 2026, under the Income Tax Act, 2025, both terms — Previous Year and Assessment Year — are gone. In their place is a single, unified concept: the Tax Year. This change affects every ITR you file, every notice you receive, every compliance communication from the income tax department, and every reference in your financial statements going forward.
This blog explains exactly what changed, what it means practically for individuals and businesses, and how the transition from the old system to the new one works during the overlap period.
Part 1 — How the Old System Worked
Under the Income Tax Act, 1961, income tax law operated on a two-year framework:
| 📌 THE OLD TWO-YEAR SYSTEM — INCOME TAX ACT, 1961 PREVIOUS YEAR (PY): The 12-month financial year from 1 April to 31 March in which income is earned. Example: Income earned from 1 April 2024 to 31 March 2025 = Previous Year 2024-25. ASSESSMENT YEAR (AY): The following financial year in which the Previous Year income is assessed and the return is filed. Always one year after the Previous Year. Example: AY 2025-26 = the year in which PY 2024-25 income is assessed. RESULT: Two different year references for the same income. Salary earned in April 2024 to March 2025 = PY 2024-25 = AY 2025-26. Every taxpayer had to remember both references simultaneously. NOTE: “Assessment Year” was also used for notice periods, limitation periods, demand timelines, and appeal filings — creating multiple cross-references. |
Why the Old System Was Confusing
The Previous Year / Assessment Year split created persistent confusion at multiple levels. Taxpayers regularly confused which year they were filing for — filing AY 2025-26 ITR while mistakenly entering AY 2024-25 as the reference. Employers issued Form 16 for the previous year but employees needed it for the assessment year filing. Banks asked for AY references on loan applications while salaried employees thought in terms of the financial year they worked in.
More practically, notices from the income tax department always cited Assessment Year references while taxpayers thought in financial year terms — causing delays, wrong responses, and missed deadlines.
Part 2 — The New System: Tax Year
| 📌 THE NEW TAX YEAR SYSTEM — INCOME TAX ACT, 2025 (Section 3) TAX YEAR: The 12-month period from 1 April to 31 March in which income is earned. This replaces BOTH Previous Year and Assessment Year as the primary reference. Example: Income earned from 1 April 2026 to 31 March 2027 = Tax Year 2026-27. SUCCEEDING TAX YEAR: The year following the Tax Year — used specifically for filing deadlines and assessment proceedings. Example: Return for Tax Year 2026-27 is due in the Succeeding Tax Year (2027-28). RESULT: One primary reference — the Tax Year — for all purposes. Salary earned in Tax Year 2026-27 = ITR filed for Tax Year 2026-27. No more separate Assessment Year to track. NEW: Notices, demands, orders, and limitations now cite Tax Year references. NEW: All forms, challans, and communications use Tax Year from 1 April 2026. |
Part 3 — Complete Comparison
| Concept | Old Act — 1961 | New Act — 2025 |
| Year income is earned | Previous Year (PY) | Tax Year (TY) |
| Year return is filed | Assessment Year (AY) | Succeeding Tax Year |
| Reference on ITR form | AY 2025-26 (for FY 2024-25) | Tax Year 2026-27 (for TY 2026-27) |
| Reference on Form 16 | AY 2025-26 | Tax Year 2026-27 |
| Reference on Form 26AS | AY (now Form 168) | Tax Year (in Form 168) |
| Notice reference | Section 143(1) for AY 2025-26 | Section equivalent for Tax Year |
| Demand reference | Demand for AY 2025-26 | Demand for Tax Year 2026-27 |
| Limitation period | Counted from end of AY | Counted from end of Succeeding TY |
| Advance tax | For relevant PY | For relevant Tax Year |
| Defined in | Section 3 (Previous Year) | Section 3 (Tax Year) |
Part 4 — The Critical Transition Period
The most important practical point about this change is the transition — because both systems run simultaneously for several years.
| ✅ FY 2024-25 income → AY 2025-26 → Governed by Income Tax Act, 1961 ✅ FY 2025-26 income → AY 2026-27 → Governed by Income Tax Act, 1961 ✅ Tax Year 2026-27 income → Tax Year 2026-27 → Governed by Income Tax Act, 2025 ✅ ITR for AY 2026-27 (FY 2025-26 income) → filed under old Act, old forms ✅ ITR for Tax Year 2026-27 → filed under new Act, new forms (being notified) ✅ Pending assessments for AY 2023-24, AY 2024-25 → continue under old Act ✅ New assessments from Tax Year 2026-27 onwards → under new Act |
This means that for the next 6-7 years, tax professionals and businesses will routinely handle matters under both Acts simultaneously — old Act for earlier years and the new Act for Tax Year 2026-27 onwards. The ability to distinguish which year is governed by which Act is essential for every CA, tax professional, and finance team in India.
| ✅ ACTION: Update all internal financial systems, compliance trackers, and communication templates to use “Tax Year 2026-27” as the primary reference for income earned from 1 April 2026. Do NOT use “AY 2027-28” for new Act matters. |
Part 5 — Practical Impact by Stakeholder
For Salaried Employees
Your employer will issue Form 130 (replacement for Form 16) for Tax Year 2026-27 — not Form 16 and not for “AY 2027-28”. When a bank, lender, or housing finance company asks for your ITR for the latest assessment year, clarify whether they mean AY 2026-27 (under old Act — FY 2025-26 income) or Tax Year 2026-27 (under new Act — income from April 2026). Both are valid references for different income years.
| ✅ ACTION: When filling any form that asks for “Assessment Year” in 2026-27 onwards, check whether the form has been updated to Tax Year language. If not, use Tax Year 2026-27 and note the equivalent in the remarks if required. |
For Business Owners and CFOs
Your board presentations, MIS reports, investor reports, and bank loan applications must begin transitioning to Tax Year terminology. Investors and lenders — particularly those with international exposure — will increasingly encounter the new terminology in official communications. Leading with Tax Year language signals financial sophistication and current compliance awareness.
Advance tax, TDS deposits, GST annual return reconciliation with income tax — all of these previously used Assessment Year references in workings. These references must be updated to Tax Year from Tax Year 2026-27 onwards.
| ✅ ACTION: Update all advance tax workings, TDS compliance calendars, board presentations, and investor reports to use Tax Year terminology for Tax Year 2026-27 onwards. |
For CAs and Tax Professionals
This is the area of highest practical impact. Client communication templates, engagement letters, notice response formats, and filing checklists all currently reference Assessment Year. Every one of these must be updated. More critically, when handling a matter that spans both systems — for example, an appeal for AY 2024-25 filed in 2027 — the professional must be precise about which Act governs, which section applies, and which year reference is correct.
| ✅ ACTION: Update all practice management software, client communication templates, notice response formats, and filing checklists. Create a clear internal protocol for handling matters under both Acts simultaneously. |
Part 6 — Action Checklist
- Stop using “Assessment Year” and “Previous Year” for any communication relating to Tax Year 2026-27 onwards.
- Update internal financial reports, MIS, and board presentations to Tax Year terminology.
- Check whether your ITR filing software has been updated for Tax Year 2026-27 — old software may default to Assessment Year references.
- When receiving notices from the income tax department from April 2026 onwards — verify whether the notice cites Tax Year or Assessment Year to determine which Act governs.
- For pending matters (assessments, appeals, demands) from earlier years — continue to use AY references as these remain under the 1961 Act.
- Update advance tax working papers and TDS compliance calendars to Tax Year 2026-27 framework.
Key Takeaways
- “Assessment Year” and “Previous Year” no longer exist under the Income Tax Act, 2025. They are replaced by “Tax Year” (Section 3) from 1 April 2026.
- Tax Year 2026-27 = the 12-month period from 1 April 2026 to 31 March 2027. Both income and return filing are referenced under the same Tax Year.
- “Succeeding Tax Year” is the new term for the year in which the return is filed and assessment is done — replacing the concept of Assessment Year for compliance deadlines.
- FY 2025-26 income is still AY 2026-27 under the old Act. The new Tax Year system starts from Tax Year 2026-27 for income earned from 1 April 2026 onwards.
- Both systems run simultaneously — old Act for AY 2026-27 and earlier; new Act for Tax Year 2026-27 onwards. This parallel operation continues for 6-7 years.
- All notices, demands, forms, certificates, and communications from the income tax department will transition to Tax Year references for Tax Year 2026-27 matters.
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Frequently Asked Questions
| Q: I am filing my ITR for FY 2025-26 this July. Do I use “AY 2026-27” or “Tax Year 2026-27”? A: AY 2026-27. FY 2025-26 income is governed by the Income Tax Act, 1961 and assessed as AY 2026-27 under that Act. The ITR form for this filing will use Assessment Year reference. Tax Year 2026-27 refers to income earned from 1 April 2026 to 31 March 2027 — that is governed by the new Act. Q: My bank loan application asks for “latest Assessment Year ITR”. What do I submit? A: Submit your AY 2026-27 ITR (for FY 2025-26 income) as the latest Assessment Year ITR if the bank form has not yet been updated to Tax Year language. If the bank form asks for Tax Year 2026-27 ITR, that would be the return for income earned from April 2026 — which is filed in 2027. Many banks and institutions will take time to update their forms to the new terminology. Q: I received a notice citing AY 2024-25. Does anything change under the new Act? A: No. The notice relates to AY 2024-25 which is governed by the Income Tax Act, 1961. All proceedings, responses, appeals, and orders relating to AY 2024-25 continue under the old Act regardless of when the notice is received. Section 536 of the new Act (Repeal and Savings) preserves all pending matters under the old Act. Q: Will assessment notices for Tax Year 2026-27 use different language? A: Yes. Assessment notices for Tax Year 2026-27 will cite “Tax Year 2026-27” as the reference — not “AY 2027-28”. The section numbers cited in the notice will also be from the new Act (e.g., Section 263 for ITR filing instead of Section 139). If you receive a notice for Tax Year 2026-27 that cites old Act section numbers, verify whether it is an error or relates to a transitional matter. |
| Assessment Year (AY) — GONE from 1 April 2026 for new Act matters Previous Year (PY) — GONE from 1 April 2026 for new Act matters Tax Year 2026-27 — the unified reference for income earned April 2026 to March 2027 Succeeding Tax Year — replaces AY concept for filing deadlines and assessments FY 2025-26 / AY 2026-27 — still under old Act. File ITR as AY 2026-27. Both systems run simultaneously — know which Act governs which year. |
This article is published for general informational and educational purposes only and does not constitute legal, tax, or professional advice. The provisions of the Income Tax Act, 2025 and the Income Tax Act, 1961 are subject to amendment through Finance Acts, CBDT Circulars, Notifications, Rules, and judicial decisions at any time. Section references, form numbers, rates, and thresholds mentioned in this article reflect the law as understood on the date of publication and may not reflect subsequent amendments or clarifications. Fimaco Private Limited has taken reasonable care in compiling this content; however, no representation is made as to the completeness, accuracy, or ongoing validity of the information herein. Readers are strongly advised to verify all provisions from the official Income Tax portal (incometax.gov.in) and consult a qualified Chartered Accountant before making any compliance or business decisions. For professional support, contact us at info@fimaco.in or visit fimaco.in.