The Income Tax Act, 2025 has brought in a small but important change in terminology: the “Tax Year.” This term now replaces the older concepts of Previous Year (PY) and Assessment Year (AY) that taxpayers used under the Income Tax Act, 1961.
The actual process of calculating your income hasn’t changed much. What’s changed is how the year is described and referred to when filing your return. In this guide, we’ll break down what Tax Year actually means, why the government introduced it, how it’s different from the old system, and what it means for you when you file your taxes.
What Is a Tax Year in Income Tax?
A Tax Year is the 12-month period from 1 April to 31 March during which you earn your income. Under the Income Tax Act, 2025, this new term replaces the earlier term “Previous Year”. The first Tax Year under the new law is 2026–27.
For example, if you earn income between 1 April 2026 and 31 March 2027, it belongs to Tax Year 2026–27. You will file your Income Tax Return (ITR) after this Tax Year ends, just as taxpayers did under the previous system.
The new law has also removed the term Assessment Year. Under the old Income Tax Act, income was earned in the Previous Year and assessed in the Assessment Year. Under the Income Tax Act, 2025, this separate Assessment Year concept no longer exists. The Income Tax Department has also confirmed that there is no concept of Assessment Year under the new Act.
In simple words, the filing process has not changed; you still earn income during one Tax Year and file your return after it ends. The main change is that the old terms Previous Year and Assessment Year have been replaced with a single, simpler term: Tax Year.
Difference Between Tax Year vs Previous Year vs Assessment Year
The comparison below shows how the new Tax Year differs from the old Previous Year and Assessment Year system:
| Feature | Tax Year (Income Tax Act, 2025) | Previous Year (Income Tax Act, 1961) | Assessment Year (Income Tax Act, 1961) |
|---|---|---|---|
| What is it? | The period in which income is earned for tax purposes under the new Act | The period in which income was earned under the old Act | The following year in which that income was assessed and the return was filed |
| Period | 1 April – 31 March | 1 April – 31 March | 1 April – 31 March (following the Previous Year) |
| When is the ITR filed? | After the Tax Year ends | Return filed in the following Assessment Year | The year in which the return is filed and income is assessed |
| Applies to | Income earned from 1 April 2026 onwards | Income earned up to 31 March 2026 | Returns, assessments, notices, and appeals related to income earned up to 31 March 2026 |
If your income was earned before 1 April 2026, the old terms Previous Year and Assessment Year will continue to apply for filing returns, assessments, notices, and appeals. The new Tax Year concept applies only to income earned from 1 April 2026 onwards.
Why Was There a Need for a Change?
For many years, the Income Tax Act, 1961 used two different terms: Previous Year and Assessment Year. While tax professionals understood the difference, many taxpayers found these terms confusing because they referred to two different years for the same income.
For example, if you earned income between 1 April 2022 and 31 March 2023, it was called the Previous Year. However, when you filed your Income Tax Return after that period, it was linked to the Assessment Year 2023–24. As a result, many people struggled to understand why the year on their tax return was different from the year in which they actually earned the income.
To make the system simpler, the Income Tax Act, 2025 replaces these two terms with a single concept called Tax Year. This makes it easier for taxpayers to identify the period in which their income was earned without dealing with two different tax-year labels.
Why Did India Replace the Previous Year and Assessment Year System?
Under the Income Tax Act, 1961, taxpayers had to deal with two different year labels for the same income cycle. The period in which income was earned was called the *Previous Year*, while the following year, in which the return was filed and the income was assessed, was called the *Assessment Year*.
Although both terms served different legal purposes, they often made tax documents harder for ordinary taxpayers to understand. A person could earn income in one financial year but see the following year mentioned on the return or notice related to that income.
The Income Tax Act, 2025 simplifies this by introducing a single term: *Tax Year*. Income earned between 1 April and 31 March will now be identified by that Tax Year, without using a separate Assessment Year label.
This change is also part of a wider effort to make the income tax law shorter, clearer, and easier to follow. The new Act has fewer sections and uses a more streamlined structure, although this reduction is not due to the Tax Year change alone.
How the Tax Year Change Affects Taxpayers
For most taxpayers, the change will mainly affect the words used on tax returns, payment forms, notices, and e-filing portal communications.
1. Returns will refer to a Tax Year
Income earned from 1 April 2026 onwards will be identified by its *Tax Year* rather than by separate Previous Year and Assessment Year labels.
For example, income earned between 1 April 2026 and 31 March 2027 belongs to **Tax Year 2026–27**. The return for this income will be filed after that Tax Year ends.
2. Notices and tax records will use the new terminology
Notices, proceedings, payment records, and portal communications relating to income covered by the new Act will refer directly to the relevant Tax Year.
Older matters will continue to use the Previous Year and Assessment Year terminology wherever the Income Tax Act, 1961 still applies.
3. The new name does not automatically change tax rates
The introduction of Tax Year is mainly a legal and structural change. It does not, by itself, change income tax slabs, deductions, rebates, or tax rates.
These may still change separately through the Finance Act applicable to the relevant year.
4. Old and new tax payments may appear together during the transition
During the transition, taxpayers may need to select between the old and new Acts depending on the period to which the payment relates.
For example, a self-assessment tax payment made in 2026 for income earned during FY 2025–26 will continue under the Income Tax Act, 1961 and use Assessment Year 2026–27.
However, advance tax paid for income earned from 1 April 2026 onwards will relate to Tax Year 2026–27 and fall under the Income Tax Act, 2025.
The payment date alone does not decide which Act applies. What matters is the period in which the related income was earned.
Which Income Tax Act Applies to Your Income?
The applicable law depends on when the income was earned.
Income earned between 1 April 2025 and 31 March 2026 continues to be governed by the Income Tax Act, 1961. This period is treated as the Previous Year 2025–26, and the corresponding return is filed for Assessment Year 2026–27.
Income earned from 1 April 2026 onwards falls under the Income Tax Act, 2025. Income earned between 1 April 2026 and 31 March 2027 belongs to Tax Year 2026–27, and the return for it will be filed after the Tax Year ends.
| Income-earning period | Governing law | Terminology used |
|---|---|---|
| 1 April 2025 to 31 March 2026 | Income Tax Act, 1961 | Previous Year 2025–26 and Assessment Year 2026–27 |
| 1 April 2026 to 31 March 2027 | Income Tax Act, 2025 | Tax Year 2026–27 |
The introduction of the new Act does not cancel unfinished matters relating to earlier years. Returns, assessments, notices, appeals, and other proceedings connected with periods before 1 April 2026 will continue under the old law wherever applicable, as confirmed in the Income Tax Department’s General Questions FAQ.
In simple terms, check the period in which the income was earned. Income up to 31 March 2026 remains under the old system, while income from 1 April 2026 onwards follows the Tax Year system.
Does Tax Year Replace Financial Year?
No. Financial Year has not been replaced. It is still used for accounting, business reporting, budgeting, and many government-related activities.
What has changed is the terminology used in the Income Tax Act, 2025. For income tax purposes, the old term Previous Year has been replaced with Tax Year for the same period from 1 April to 31 March.
Can a Tax Year Be Shorter Than 12 Months?
Yes. In some situations, the first Tax Year may be shorter than 12 months.
For example, if a new business is started or a new source of income begins during the financial year, the Tax Year starts from that date instead of 1 April.
Suppose a business starts on 1 December 2026. Its first Tax Year will run from 1 December 2026 to 31 March 2027. From the following year, it will follow the normal 1 April to 31 March cycle.
What About Older Income Tax Records?
The new Tax Year system applies to income earned from 1 April 2026 onwards.
Returns, notices, assessments, and other tax records related to earlier years will continue to follow the old Previous Year and Assessment Year terminology wherever applicable.
Example: Suppose Ananya starts her first job on 1 June 2026.
Since her salary begins after 1 April 2026, her income falls under the Income Tax Act, 2025. Her first Tax Year will run from 1 June 2026 to 31 March 2027.
On the other hand, someone who earned income before 1 April 2026 will continue using the old Previous Year and Assessment Year terms until those earlier tax matters are completed.
Frequently Asked Questions
Q. 1 Is Tax Year the same as Financial Year?
Yes, both cover the same period from 1 April to 31 March. However, Financial Year is a general accounting term, while Tax Year is the term used under the Income Tax Act, 2025 for income tax purposes.
Q. 2 What is the current Tax Year?
The current Tax Year is 2026–27, covering income earned between 1 April 2026 and 31 March 2027. It is also the first Tax Year introduced under the Income Tax Act, 2025.
Q. 3 Does this change affect tax rates?
No. The introduction of the Tax Year changes only the terminology used under the law. Income tax slabs, rates, deductions, and rebates continue to be decided separately through the Finance Act.
Q. 4 Will I still need to file an Income Tax Return (ITR)?
Yes. The return filing process remains the same. The only difference is that income earned from 1 April 2026 onwards will be identified using the Tax Year instead of the Assessment Year.
Q. 5 Why was the Assessment Year removed?
The Income Tax Act, 2025 replaces the separate Assessment Year with a single Tax Year to make the tax system easier to understand. This helps taxpayers identify the relevant year without dealing with two different tax-year terms.
Q. 6 Is Previous Year still applicable?
Yes. The terms Previous Year and Assessment Year will continue to apply to income earned before 1 April 2026. Income earned from 1 April 2026 onwards follows the new Tax Year system.
Conclusion
If you’re still wondering what income tax is, the new Tax Year system is one of the important concepts you’ll need to understand. Although the terminology has changed under the Income Tax Act, 2025, the basic process of earning income, calculating tax, and filing an Income Tax Return (ITR) remains largely the same.
If your income was earned before 1 April 2026, the old Previous Year and Assessment Year terms will still apply. For income earned from 1 April 2026 onwards, you’ll use the new Tax Year terminology.
The most important thing is to understand which law applies to your income and file your return within the applicable due date. Once you know that, the new system becomes much easier to follow.
Disclaimer
This article is intended for general informational and educational purposes only. It should not be considered tax, legal, or financial advice. Although we have made every effort to keep the information accurate and updated as of July 2026, tax laws may change through future Finance Acts, CBDT notifications, or court rulings. Always verify the latest information on the official Income Tax Department website or consult a qualified Chartered Accountant before making any tax-related decision.