The Income Tax Act, 2025 came into force on April 1, 2026, replacing the Income Tax Act, 1961, a law that had governed India’s tax system for more than six decades and survived over sixty Finance Acts and thousands of individual amendments along the way. If the phrase “new tax law” has you bracing for higher taxes or a completely unfamiliar filing process, the reality is more reassuring than the headlines might suggest.
This guide explains what the new Act actually changes, what stays exactly the same, and walks through the old versus new tax regime slabs that apply for FY 2026-27, since regime choice remains the far more important decision for your actual tax bill.
The One Thing to Understand First: Tax Rates Have Not Changed
The Income Tax Department’s own official FAQ on the new Act states plainly that the Income Tax Act, 2025 does not impose any new tax, and does not increase rates, remove existing deductions, or alter the fundamental structure of how income is classified. This is a restructuring of the law, not a change in tax policy. The government’s stated goal was to simplify decades of accumulated complexity, not to change how much tax anyone pays.
Why the Government Rewrote the Law
The Income Tax Act, 1961 had grown into one of the most amended pieces of legislation in the country, reshaped by more than 60 Finance Acts and thousands of individual changes over the decades. What started as a reasonably structured law became layered with overlapping provisions, outdated references, and technical drafting that often required expert interpretation even for routine compliance. The Income-tax Bill, 2025 was introduced in the Lok Sabha on February 13, 2025, refined through a Select Committee review, and passed by both houses of Parliament in August 2025 before receiving presidential assent on August 21, 2025.
What Actually Changed: Structure, Not Substance
Section Count Reduced Nearly in Half
The 1961 Act had grown to over 819 sections across its lifetime. The 2025 Act consolidates this into 536 sections spread across 23 chapters. This reduction came primarily from folding explanations and provisos directly into main section text, replacing dense narrative provisions with tables and formulas, and removing redundant or obsolete provisions that had accumulated over sixty years.
“Tax Year” Replaces “Previous Year” and “Assessment Year”
One of the most immediately noticeable changes for ordinary taxpayers is terminology. The old system’s dual concept of a Previous Year, when income is earned, and an Assessment Year, when it is assessed and taxed, was a common source of confusion, particularly for first-time filers. The 2025 Act replaces both terms with a single, more intuitive concept called the Tax Year. From FY 2026-27 onward, you simply refer to the year your income was earned, without the added mental step of translating it into a separate assessment year.
Salary-Related Provisions Consolidated
All salary-related deductions and exemptions, which were previously scattered across multiple sections in the old Act, are now grouped under a single chapter. For salaried employees and the payroll teams processing their tax deductions, this makes it considerably easier to locate the relevant provision without cross-referencing multiple parts of the law.
TDS Schedules Presented as Tables
TDS rate schedules, previously scattered across dozens of sections with nested provisos, are now presented in clean, structured tables. This is a genuinely practical improvement for anyone who has ever had to manually trace through the old Act to confirm a specific TDS rate.
What Stays Exactly the Same
It is worth being explicit about what has not changed, since this is where most of the anxiety around a “new tax law” tends to be misplaced. Tax rates and slab structures remain identical to what applied under the 1961 Act. Existing deductions, exemptions and the overall classification of income into heads such as salary, house property, capital gains, business income and other sources continue unchanged. Filing forms, procedures and the general compliance workflow you are already familiar with remain largely intact, with the transition designed specifically to avoid disruption.
When Does the New Act Actually Apply to You
This is where timing matters. The Income Tax Act, 2025 governs income earned from April 1, 2026 onward, meaning it applies starting Tax Year 2026-27. Your ITR for FY 2025-26, which was due by July 31 or August 31, 2026 depending on your category, was filed entirely under the old 1961 Act using existing section references and forms. The new Act has no bearing on that filing. Your next return, covering income earned from April 2026 onward, will be the first one governed by the new framework, and it will not be due until 2027.
Old vs New Tax Regime: The Choice That Actually Affects Your Tax Bill
Regardless of which Act governs your filing, the decision that meaningfully changes how much tax you pay each year remains your choice between the old and new tax regimes, a choice the fresh Act does not alter.
New Regime Slabs for FY 2026-27
| Income Slab | Tax Rate |
|---|---|
| Up to ₹4 lakh | Nil |
| ₹4 lakh to ₹8 lakh | 5% |
| ₹8 lakh to ₹12 lakh | 10% |
| ₹12 lakh to ₹16 lakh | 15% |
| ₹16 lakh to ₹20 lakh | 20% |
| ₹20 lakh to ₹24 lakh | 25% |
| Above ₹24 lakh | 30% |
The new regime, which continues as the default regime for FY 2026-27, offers a standard deduction of ₹75,000 for salaried taxpayers and a Section 87A rebate of up to ₹60,000, which together mean a salaried individual with gross income up to roughly ₹12.75 lakh pays effectively zero tax.
Old Regime Slabs for FY 2026-27
| Income Slab | Tax Rate |
|---|---|
| Up to ₹2.5 lakh | Nil |
| ₹2.5 lakh to ₹5 lakh | 5% |
| ₹5 lakh to ₹10 lakh | 20% |
| Above ₹10 lakh | 30% |
The old regime carries a lower basic exemption and steeper early slabs, but allows over 70 exemptions and deductions, including HRA, LTA, and Section 80C investments, that can meaningfully reduce taxable income for taxpayers with significant eligible deductions. It also offers a standard deduction of ₹50,000 and its own Section 87A rebate for income up to ₹5 lakh.
Which Regime Should You Choose
There is no universal answer, and this is precisely why the choice matters more than the Act rewrite. Taxpayers with minimal deductions, particularly those without a home loan, significant HRA claims, or heavy Section 80C investments, generally come out ahead under the new regime’s lower rates and higher nil-tax threshold. Taxpayers with substantial eligible deductions under the old regime, especially a home loan combined with maximised 80C contributions, may still find the old regime more favourable depending on their specific numbers. Since Budget 2026 made no changes to either slab structure, this year’s decision comes down entirely to running your own numbers under both regimes rather than any policy shift.
You are free to choose your regime at the start of the year and can modify your choice while filing your return, since it is not mandatory to stick with the new default regime.
Frequently Asked Questions
Does the Income Tax Act 2025 increase my tax liability?
No. The Income Tax Department has officially confirmed that the new Act does not impose any new tax and does not increase rates or remove existing deductions. It restructures how the law is written and organised, not what you owe.
When does the Income Tax Act 2025 come into effect?
The Act came into force on April 1, 2026, and applies to income earned from Tax Year 2026-27 onward. Income earned up to March 31, 2026 continues to be governed entirely by the earlier Income Tax Act, 1961.
What is a Tax Year under the new Act?
Tax Year is a single, simplified concept that replaces the old system’s separate Previous Year and Assessment Year terminology, referring simply to the year in which your income was earned, without a separate assessment year label to track alongside it.
Do I need to file my FY 2025-26 return under the new Act?
No. Your ITR for FY 2025-26 (AY 2026-27), due by July 31 or August 31, 2026 depending on your taxpayer category, is filed entirely under the old Income Tax Act, 1961, using existing forms and section references.
Which tax regime is better for FY 2026-27, old or new?
It depends entirely on how many deductions you claim. Taxpayers with few deductions generally benefit from the new regime’s lower rates and ₹12.75 lakh effective nil-tax threshold for salaried individuals, while those with substantial deductions like a home loan or maximised Section 80C investments may still find the old regime more favourable after running the actual numbers.
