Tax Year vs Financial Year vs Assessment Year

Why This Change Matters for Every Taxpayer in India

If you have been filing income tax returns in India for a few years, you already know the drill. Income is earned in the Financial Year. Tax is filed in the Assessment Year. Two different labels for two different periods of the same income cycle.

From April 1, 2026, the new Income Tax Act 2025 has replaced this two-year system with a single concept called the Tax Year. It sounds like a small terminology update. But if you do not understand it clearly before filing your July 2026 return, you will get confused at the portal, potentially select the wrong tab, and create problems for yourself.

This article explains exactly what Financial Year, Assessment Year, and Tax Year mean, how they differ from each other, and what you need to do differently for your ITR filing in July 2026.

Important for July 2026 Filing: Even though the Income Tax Act 2025 is now in force from April 1, 2026, your July 2026 ITR covers income from FY 2025-26, which falls under the old Act 1961. Use Tab 1 on the income tax portal for this filing, not Tab 2. Tab 2 is for Tax Year 2026-27 onwards.

Financial Year, Assessment Year, and Tax Year: Quick Comparison

Before going into the details, here is the complete picture in one table.

The dates have not changed. What has changed is that you no longer need two different year labels for the same income cycle. Tax Year 2026-27 replaces what used to be called FY 2026-27 and AY 2027-28 together.

What Was Financial Year (FY)?

Under the Income Tax Act 1961, the Financial Year was the 12-month period from April 1 to March 31 in which you earned your income. Every salary slip, investment proof, TDS certificate, and bank statement was linked to this year.

When your employer issued Form 16 or your bank issued an interest certificate, it was always for a specific Financial Year. For example, Form 16 for FY 2025-26 covered salary and TDS for the period April 1, 2025 to March 31, 2026.

Example: Ananya works as a software engineer in Bengaluru. She earned Rs. 12 lakh salary between April 1, 2025 and March 31, 2026. That period is her Financial Year 2025-26. Her employer deducted TDS on this salary throughout the year and issued her Form 16 (now called Form 130) in June 2026 covering FY 2025-26.

What Was Assessment Year (AY)?

The Assessment Year was the 12-month period immediately after the Financial Year. This was the year in which you actually filed your ITR, paid any remaining tax, and the Income Tax Department assessed your liability.

So income earned in FY 2025-26 was assessed in AY 2026-27. The filing deadline for most salaried individuals was July 31 of the Assessment Year.

Example: Continuing with Ananya’s case, she earned Rs. 12 lakh in FY 2025-26. She will file her ITR by July 31, 2026. That filing happens in AY 2026-27. Her tax is calculated on FY 2025-26 income, but the return is filed and processed in AY 2026-27.

Why Did the Two-Year System Cause Confusion?

The FY and AY system confused even experienced taxpayers every year. Here is why:

• Banks, loan officers, and employers would ask for your “tax year” without specifying whether they meant FY or AY, leading to wrong documents being submitted
• The two labels looked similar but referred to two completely different 12-month periods
• When filling forms for visa applications, home loans, or credit cards, many people incorrectly wrote AY where FY was required and vice versa
• First-time filers routinely selected the wrong Assessment Year on the portal, a mistake that created serious filing errors
• Notices and orders from the Income Tax Department referenced AY, while investment proofs referenced FY, making it hard to match documents

The Income Tax Act 2025 has addressed this by introducing a single unified term.

What Is Tax Year Under the Income Tax Act 2025?

The Income Tax Act 2025, effective from April 1, 2026, introduces Tax Year as the single reference for income and compliance. It replaces both Financial Year and Assessment Year.

A Tax Year is still a 12-month period running from April 1 to March 31. The physical dates have not changed at all. What has changed is the label and the concept behind it.

Under the new system, income earned from April 1, 2026 to March 31, 2027 falls under Tax Year 2026-27. Your ITR for this income will be filed in July 2027 and will be referred to as the Tax Year 2026-27 return. You do not need a separate AY label anymore.

Simply put: Tax Year = Financial Year. Same dates, single label.

Tax Year 2026-27 covers income earned from April 1, 2026 to March 31, 2027. The ITR for this Tax Year will be filed by July 31, 2027. This is the first Tax Year under the new Income Tax Act 2025.

The Transition Period: What Applies When

The transition from the old system to the new one happens in stages. This is the part that confuses most people and where mistakes are most likely to happen.

The income tax portal handles both Acts simultaneously. Tab 1 is for the old Act and Tab 2 is for the new Act. For your July 2026 ITR, you will always use Tab 1 because the income period (April 2025 to March 2026) predates the new Act. For a complete walkthrough of filing on the portal, read the step-by-step guide on how to file ITR online.

Old Section Numbers vs New Section Numbers

Along with the Tax Year concept, the Income Tax Act 2025 has reorganized and renumbered many sections. For your July 2026 filing covering FY 2025-26, always use the old section numbers. New section numbers apply only for Tax Year 2026-27 onwards.

For a complete mapping of all section number changes under the new Act, the article on Income Tax Act 2025 vs Income Tax Act 1961 covers every major change in detail. For understanding TDS on your salary under the old and new numbering, refer to the TDS on salary Section 192 guide.

What Has NOT Changed

The Tax Year is primarily a terminology and structural simplification. The following things remain exactly the same for FY 2025-26 and are not affected by this change:

• Tax slabs and rates: No change under both old and new regime for FY 2025-26
• Standard deduction: Rs. 75,000 under new regime and Rs. 50,000 under old regime
• Section 87A rebate: Income up to Rs. 12 lakh remains tax-free under the new regime
• The April 1 to March 31 structure: Tax Year runs on the same calendar as the old Financial Year
• ITR filing deadlines: July 31, 2026 for ITR-1 and ITR-2; August 31, 2026 for ITR-3 and ITR-4 (non-audit cases)
• Advance tax schedule: Four instalments by June 15, September 15, December 15, and March 15
• Late filing fee: Rs. 5,000 after the deadline (Rs. 1,000 if income is below Rs. 5 lakh)

For full details on ITR deadlines and the consequences of late filing, read the ITR filing last date 2026 guide.

Practical Impact on Your July 2026 ITR Filing

Here is exactly what this change means when you sit down to file your return in July 2026.

On the Income Tax Portal

When you log in to incometax.gov.in and go to e-File, you will see two tabs. Tab 1 is for the Income Tax Act 1961. Tab 2 is for the Income Tax Act 2025. For your July 2026 filing (income from April 2025 to March 2026), select Tab 1. Do not navigate to Tab 2 for this filing.

On ITR Forms and Notices

Forms issued for FY 2025-26 filings will continue to use the old terminology. Your ITR acknowledgment will reference AY 2026-27. Any notice or intimation from the department related to this return will say AY 2026-27. Do not expect Tax Year terminology on documents related to your July 2026 filing.

On Investment and Deduction Claims

All deduction claims for your July 2026 return use old section numbers. Your Section 80C limit is Rs. 1.5 lakh, your Section 80D claim is under the old limits, and your HRA exemption calculation is unchanged. The new section numbers (123, 124, 392) are relevant only for Tax Year 2026-27 returns.

For Advance Tax from June 2026

Advance tax payments from June 2026 onwards are made under the Income Tax Act 2025 framework and reference Tax Year 2026-27. This is the one area where the new Act applies immediately for the current period, even as you prepare your old Act return for July 2026.

Frequently Asked Questions

Is Tax Year the same as Financial Year?

Yes. Tax Year covers the same April 1 to March 31 period as the old Financial Year. The physical dates are identical. Only the name and the concept have changed under the Income Tax Act 2025. Tax Year eliminates the need for a separate Assessment Year label.

From which year does Tax Year apply?

Tax Year applies from April 1, 2026. Income earned from April 1, 2026 onwards falls under Tax Year 2026-27. Income earned before April 1, 2026 continues to be governed by the old FY and AY system under the Income Tax Act 1961.

Do I use Tax Year terminology when filing my July 2026 ITR?

No. Your July 2026 return covers FY 2025-26, which falls entirely under the old Income Tax Act 1961. Use FY 2025-26 and AY 2026-27 for this filing. Tax Year terminology starts from the return for Tax Year 2026-27, which will be filed in July 2027.

What is Tab 1 and Tab 2 on the income tax portal?

Tab 1 on the portal covers the Income Tax Act 1961. All returns for FY 2025-26 and earlier are filed under Tab 1. Tab 2 covers the Income Tax Act 2025 and will be activated for Tax Year 2026-27 returns filed from July 2027 onwards. Using the wrong tab for your July 2026 filing can create errors.

Has the income tax year shifted from April-March to a calendar year?

No. The April 1 to March 31 structure remains unchanged. Tax Year 2026-27 still runs from April 1, 2026 to March 31, 2027. The government has not shifted to a January-December calendar year despite past discussions. Only the label has been simplified.

Does this change affect TDS deducted by my employer?

For TDS deducted on your salary in FY 2025-26 (April 2025 to March 2026), the old provisions under Section 192 continue to apply. From April 2026 onwards, TDS on salary will be governed by Section 392 of the Income Tax Act 2025. Your employer’s payroll system handles this transition. For a detailed understanding of how TDS on salary works, read the TDS on salary guide.

What about old assessments and pending notices?

All assessments, appeals, and proceedings for years before April 1, 2026 continue under the Income Tax Act 1961 until they are fully resolved. The repeal of the old Act does not affect any pending matters from earlier years.

Will my CA or employer use the new section numbers from now?

For any communication related to FY 2025-26 and earlier, old section numbers continue to be used. For Tax Year 2026-27 and beyond, new section numbers apply. During this transition period, both sets of numbers will be in use simultaneously across different contexts.

Tax Year vs Financial Year vs Assessment Year: Summary

The Income Tax Act 2025 introduces several other important changes beyond just the Tax Year concept, including new ITR forms, revised TDS provisions, and updated compliance requirements. For the complete picture, read the detailed comparison of Income Tax Act 2025 vs Income Tax Act 1961.

For everything you need to know about income tax in India from slabs to deductions to filing, the Complete Income Tax Guide India is the right starting point.

If you have questions about how this change affects your specific filing situation, drop them in the comments below.

Written & Reviewed by

Diksha Chawla

Financial Educator & Content Creator | FinLecture.in

Diksha covers Indian income tax, mutual funds, ITR filing, and personal finance. FinLecture content is cross-checked against official government portals and SEBI/AMFI guidelines.

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