Tax Year vs Financial Year vs Assessment Year: What Changed in 2026

The old confusion: FY, PY and AY

If you have ever filed an income tax return in India, you have met the puzzle. You earned your salary in one year, but the return was for a different year. That is because the Income-tax Act, 1961 used two labels for what was really one continuous cycle.

The Financial Year (also called the Previous Year, or PY) was the 12 months in which you earned the income, from 1 April to 31 March. The Assessment Year (AY) was the 12 months that followed, when that income was assessed and the return filed. So income earned in FY 2024-25 was taxed in AY 2025-26.

What "Tax Year" means now

The Income Tax Act, 2025 retires both terms and replaces them with a single concept: the Tax Year. It is defined in the Act as a 12-month period running from 1 April to 31 March, the same window as the financial year.

The key improvement is that you now earn income and are taxed on it in the same named year. Income earned in Tax Year 2026-27 is simply reported for Tax Year 2026-27. There is no separate assessment year a step ahead. One label, one timeline.

This change took effect on 1 April 2026. It applies to income earned from that date onward, which is why the first true Tax Year is 2026-27.

Side by side: old system vs new

The clearest way to see the change is to line up the same year under both systems:

Notice the dates do not move. A Tax Year is not a new period, it is simply one name for the 12 months that previously needed two. India's fiscal year (1 April to 31 March) is unchanged, and this is not the calendar year, which India has never used for tax.

Which term applies to your filing

This is the part most people are getting wrong right now, so read it carefully. Which system applies depends entirely on when the income was earned, not when you file.

• Income earned up to 31 March 2026 falls under the old 1961 Act. Your return filed by 31 July 2026 is still Assessment Year 2026-27. You use the old terminology and the old section numbers.
• Income earned from 1 April 2026 falls under the new 2025 Act. It will be filed as Tax Year 2026-27, with the first such returns due in 2027.

So the term you use is not a choice, it follows the income. For a clear view of how the two Acts sit alongside each other during the changeover, see our guide on what the Income Tax Act 2025 actually changes.

Does the financial year disappear?

No, and this trips people up. The financial year still exists as an accounting concept. Businesses still keep books, prepare financial statements and close accounts on the same 1 April to 31 March cycle. Nothing about your accounting year changes.

What changed is only the income-tax label for that period. For tax purposes, the year formerly split into "Previous Year" and "Assessment Year" is now simply the "Tax Year". Your balance sheet, your audit and your statutory filings run on the same calendar as before.

Because the Tax Year aligns exactly with the financial year, businesses need make no change to their accounting year or financial statements. If you run a company and want your compliance calendar mapped cleanly across the transition, our income tax compliance service handles it.

Special cases: new businesses and old years

Two situations are worth knowing:

• Newly set-up businesses get a shorter first Tax Year. If a business is established on, say, 1 December 2026, its first Tax Year runs from 1 December 2026 to 31 March 2027, not a full twelve months. The clock starts on the date of establishment.
• References to old years: the 2025 Act includes a transitional provision (Section 536(3)) stating that any reference to a "Tax Year" is read as the corresponding "Previous Year" under the old Act. So if the new Act mentions "Tax Year 2024-25," it means the previous year 2024-25, which was Assessment Year 2025-26. This is purely a mapping rule and does not change the tax treatment of those older years.

For ordinary salaried taxpayers, neither special case applies, you simply file your July 2026 return as usual and start using "Tax Year" language for income from April 2026.

Quick answers

Is Tax Year the same as financial year? For dates, yes, both run 1 April to 31 March; the financial year continues as an accounting term while "Tax Year" is the new income-tax label. Does Tax Year replace Assessment Year? Yes, from 1 April 2026 it replaces both Previous Year and Assessment Year. Which year is my July 2026 filing? Assessment Year 2026-27, under the old Act, because the income was earned before April 2026. When does Tax Year first apply? To income earned from 1 April 2026, filed as Tax Year 2026-27 in 2027. If the terminology still feels slippery, our ITR filing service takes care of getting the right year and references on your return.