New Income Tax Act 2025: Everything That Changes From 1 April 2026

India's Income Tax Act 1961 — a 64-year-old law that had been amended over 4,000 times — is being replaced. The New Income Tax Act 2025, announced by Finance Minister Nirmala Sitharaman in Budget 2026, comes into force on 1 April 2026. This is the biggest structural overhaul of India's direct tax law in six decades. Here is what every individual taxpayer, salaried employee, business owner, and company must know — and do — before the new Act kicks in.

1. Why Was a New Act Needed?

The Income Tax Act of 1961 was enacted when India had a largely agrarian economy with a narrow tax base. Over six decades, it accumulated layer upon layer of amendments, provisos, explanations, and judicial interpretations. By 2025, the Act had grown to over 800 sections and more than 2,000 pages. Even tax professionals found it difficult to navigate.

The government launched a comprehensive review in 2024, driven by three goals: simplicity, certainty, and reduced litigation. The result is the Income Tax Act 2025 — not a collection of amendments to the old Act, but an entirely fresh statute written in plain language, restructured from scratch, and built for a digital-first, technology-driven tax administration.

Importantly, this is a structural reform — not a rate reform. Tax rates, slabs, and deductions are broadly unchanged. The government explicitly stated that this is about administrative clarity, not additional tax burden.

2. The "Tax Year" Concept — Goodbye to FY and AY

This is the change that will affect every taxpayer's daily understanding of income tax. Under the old Act, India used two time-period concepts that caused widespread confusion:

• Financial Year (FY): The year in which income is earned (e.g., April 2025 to March 2026 = FY 2025-26)
• Assessment Year (AY): The year in which that income is assessed and tax is filed (e.g., AY 2026-27)

The new Act abolishes this two-year concept and introduces a single "Tax Year" — defined as twelve months beginning on 1 April. Income earned and tax filed are now both referenced to the same Tax Year.

3. Tax Rates and Slabs — What Changes

The short answer: nothing changes on rates. The government made a deliberate decision to separate structural reform from rate changes. The existing slab structure — already updated in Budget 2025 and Budget 2026 — continues unchanged under the new Act.

The rebate under Section 87A (now Clause 202 in the new Act) continues — resident individuals with taxable income up to ₹7 lakh effectively pay zero tax under the new regime. Standard deduction of ₹75,000 for salaried employees also continues.

4. New ITR Filing Deadlines — Important Changes

Budget 2026 announced significant changes to ITR filing deadlines alongside the new Act. These deadlines apply from Tax Year 2026-27 onwards:

5. MAT Becomes a Final Tax at 14% — Critical for Companies

This is one of the most significant corporate tax changes in the new Act. Under the old regime, Minimum Alternate Tax (MAT) — charged at 15% on book profits — functioned as a prepayment. Companies could carry forward MAT credit and set it off against regular income tax in future years when their regular tax liability exceeded MAT.

From 1 April 2026, this changes fundamentally:

• MAT rate reduced from 15% to 14%
• MAT becomes a final tax — no further credit accumulation after 1 April 2026
• Brought-forward MAT credit accumulated up to 31 March 2026 remains available for set-off against future regular tax liabilities

Companies that had large MAT credit balances on their balance sheets should also reassess the recoverability of these Deferred Tax Assets (DTAs) under Ind AS 12 / AS 22. If MAT credit can no longer be accumulated, the DTA may need to be impaired or reassessed for future utilization.

6. Simpler Language — How the New Act Reads Differently

The most visible change in the new Act is how it reads. The government has rewritten every provision in plain English — shorter sentences, active voice, no labyrinthine provisos. Some examples of how familiar provisions look in the new Act:

• The old "Previous Year / Assessment Year" framework is replaced throughout with "Tax Year"
• Lengthy provisos are broken into numbered sub-clauses for clarity
• Explanations that previously appeared at the end of complex sections are now integrated within the text
• Cross-references — which required knowing multiple sections to understand a single provision — have been substantially reduced
• Tables and formulae are presented visually rather than buried in text

The new Act has 23 chapters covering all major income heads, deductions, computation, administration, and appeals. While the number of provisions is lower, the coverage is complete — every concept in the old Act is addressed in the new structure.

7. Virtual Digital Assets — Expanded Scope

The new Act formalises and expands the definition of Virtual Digital Assets (VDA) — covering cryptocurrencies, NFTs, tokens, and other digital assets. Key points:

• VDA taxation rate remains unchanged — 30% flat tax on gains, no set-off of losses against other income
• The definition is broadened to explicitly include a wider range of digital assets, reducing ambiguity about what qualifies as a VDA
• Reporting requirements for VDA transactions are tightened — expect stricter pre-filling of VDA data in ITR forms
• TDS on VDA transfers continues at 1% under the new Act's corresponding provisions

8. ICDS and IndAS Alignment — Effective 2027-28

A significant long-term reform announced alongside the new Act: the government will form a Joint Committee of the Ministry of Corporate Affairs and CBDT to incorporate Income Computation and Disclosure Standards (ICDS) into Indian Accounting Standards (Ind AS).

From Tax Year 2027-28, separate ICDS-based adjustments to book profits will be eliminated. Companies will compute taxable income directly from their Ind AS financial statements, without the need for separate ICDS workings. This is expected to significantly reduce compliance effort and the scope for disputes arising from differences between Ind AS and ICDS treatments.

9. What Stays Exactly the Same

Given the scale of the reform, there is understandable anxiety about what might have changed. The government has been explicit: this is a restatement, not a reinvention. The following are unchanged:

• Income tax slabs and rates for individuals, HUFs, firms, and companies
• Section 80C deductions (now renumbered but identical in content) — ₹1.5 lakh limit, same instruments
• HRA, LTA, standard deduction for salaried employees — same amounts and conditions
• Capital gains tax rates — STCG at 20%, LTCG at 12.5% on equities, 12.5% on property (without indexation)
• TDS / TCS provisions — same rates, same thresholds
• Business income computation — presumptive taxation under 44AD/44ADA continues unchanged
• Old tax regime — continues as an option for individuals and HUFs
• Returns filed before 31 March 2026 — remain valid under the old Act; no restatement needed

10. What You Must Do Before 31 March 2026

The transition to the new Act is automatic — there is no registration or application required. However, proactive steps now will prevent confusion and compliance errors from April 2026 onwards:

• Individuals: Note the new revised return deadline (31 March) — you now have more time to correct your Tax Year 2026-27 return if needed. Update your understanding of "Tax Year" so you can communicate effectively with your CA and employer.
• Non-audit businesses and professionals: Note that your ITR deadline moves to 31 August from Tax Year 2026-27. Plan your accounts closure and CA engagement timeline accordingly.
• Companies with MAT credit: Urgently quantify your brought-forward MAT credit as of 31 March 2026. Assess deferred tax asset recoverability under Ind AS 12. No new credit accumulates from 1 April 2026 — this is a permanent change to your tax planning model.
• Businesses using accounting software: Ensure your ERP and accounting software is updated to refer to "Tax Year" rather than "FY/AY" and that it applies correct MAT provisions from April 2026.
• VDA holders: Maintain clean records of all digital asset purchases, sales, and transfers. The new Act's broader definition and stricter reporting means CBDT will be looking more closely.
• Tax teams and CFOs: Brief your finance and accounts teams on the new Act before 1 April 2026. The structural change is significant and errors in the transition period are likely without proactive education.