For decades, Indian taxpayers have juggled two confusingly similar terms: the year you earn (Previous Year / Financial Year) and the year you’re taxed on it (Assessment Year). The Income-tax Act, 2025 ends that with a single, plain-English idea — the Tax Year. Here is what it means and why it makes life simpler.
What is the Tax Year?
The Tax Year is the 12-month period from 1 April to 31 March in which income is earned, and it is the single reference point for taxing that income under the Income-tax Act, 2025. The first Tax Year is 2026-27, covering income earned from 1 April 2026 to 31 March 2027.
Why the old system was confusing
Under the 1961 Act, the same stretch of time had two labels:
- Previous Year / Financial Year (FY): the year in which you earned the income.
- Assessment Year (AY): the following year, in which that income was assessed and the return filed.
So income earned in FY 2024-25 was taxed in AY 2025-26. Two terms, one year apart, describing closely linked things — a frequent source of errors for taxpayers selecting the wrong year on the portal.
FY/AY vs Tax Year — a side-by-side
| Income earned | Old system | New system |
|---|---|---|
| 1 Apr 2025 – 31 Mar 2026 | FY 2025-26 / AY 2026-27 | (Still old Act — see below) |
| 1 Apr 2026 – 31 Mar 2027 | Would have been FY 2026-27 / AY 2027-28 | Tax Year 2026-27 |
One period, one name. The Tax Year removes the second label entirely.
Why the change was made
The shift is part of the Income-tax Act, 2025’s simplification drive. A single Tax Year aligns India with global practice, removes the FY-versus-AY confusion that caused wrong-year selections and notices, and makes the law easier to read for ordinary taxpayers. It is a clarity reform, not a tax increase.
The transition: which year uses which system
Because the Income-tax Act, 2025 applies to income from 1 April 2026, the systems split cleanly by period:
- Income up to 31 March 2026 (FY 2025-26) is still assessed under the 1961 Act using the FY/AY framework — your current return is for AY 2026-27.
- Income from 1 April 2026 (Tax Year 2026-27) falls under the new Act and the Tax-Year framework, which you will file in 2027.
The e-filing portal supports both, so the practical task is simply selecting the correct period when you pay or file. For a deeper look at everything the new Act changes, see /blog/income-tax-act-2025-explained.
What does NOT change
- The 1 April to 31 March cycle is unchanged — only the naming changes.
- Tax slabs and rates are unaffected by the terminology shift.
- Due dates are set by separate provisions; the Tax Year label does not move them.
How the Tax Year fits the bigger picture
The Tax Year is the backbone reference of the Income-tax Act, 2025: income is computed for a Tax Year, advance tax is paid against a Tax Year, and returns are filed for a Tax Year. It replaces the dual FY/AY system without disturbing the underlying April–March cycle, the rates or the deadlines — making it the cleanest single improvement in the new law.
Key takeaways
- The Tax Year is one 12-month period (1 April–31 March), replacing FY and AY.
- It starts from Tax Year 2026-27 under the Income-tax Act, 2025.
- FY 2025-26 still uses the old FY/AY system under the 1961 Act.
- The April–March cycle, rates and due dates do not change.
- It is a simplification, aligning India with global practice.
Frequently asked questions
What is the Tax Year in income tax? A single 12-month period from 1 April to 31 March, introduced by the Income-tax Act, 2025, that replaces the old “Previous Year/Financial Year” and “Assessment Year” terms.
Is the Tax Year the same as the Financial Year? It covers the same 1 April to 31 March period, but it replaces both the Financial Year and the Assessment Year with one term instead of two.
When did the Tax Year concept start? From 1 April 2026. The first Tax Year is 2026-27.
What happened to the Assessment Year? It is no longer used under the new Act. Income is now simply taxed with reference to the Tax Year in which it is earned.
Does the Tax Year change my filing due dates? No. Due dates are set by separate provisions. The Tax Year is a naming change, not a deadline change.
Which system applies to FY 2025-26? The old FY/AY system under the 1961 Act. Income up to 31 March 2026 is filed for AY 2026-27.
Tax Year aur Financial Year me kya farak hai? Tax Year wahi 1 April se 31 March ka period hai, lekin yeh Financial Year aur Assessment Year dono ko ek hi term me badal deta hai — do ke bajaye ek.
Why was the Tax Year introduced? To simplify the law, remove the long-standing FY-versus-AY confusion, and align India with global practice.
Have questions about the transition?
The Tax Year is simple in principle, but the transition year is where wrong-period selections happen. Regikart’s CA & CS team can make sure your filings map to the right framework. Reach us at +91 70444 94804 or [email protected], or see our income tax services at /income-tax-services.
About the author
CA & CS Team
Reviewed by Regikart at Regikart. Want to discuss this in the context of your business?
