Introduction: A New Law, But Not a New Tax Burden
The Income-tax Act, 2025 marks one of the most important structural changes in India’s direct tax law framework. From 1 April 2026, the Income-tax Act, 1961 stands replaced by the new Act. Naturally, this raises many practical questions for taxpayers, businesses, professionals, NRIs, deductors, companies and tax consultants.
Will old assessments become invalid?
Will pending notices continue?
Will PAN and TAN change?
Will there be a missing year between Assessment Year and Tax Year?
Will taxpayers face a higher tax burden?
The answer, in simple terms, is this: the Income-tax Act, 2025 is designed as a smooth transition, not a disruptive replacement.
The new law is intended to simplify language, reduce unnecessary complexity, consolidate scattered provisions, and make tax compliance more understandable. It is not introduced to impose a new tax or automatically increase the tax burden.
For taxpayers who need help in understanding old sections and their corresponding new provisions, our free Income-tax Act 1961 ↔ 2025 Section Finder can be useful for quick reference.
Why Was the Income-tax Act, 1961 Replaced?
The Income-tax Act, 1961 served India for more than six decades. During this period, it was amended repeatedly through Finance Acts, circulars, notifications, provisos, explanations and judicial interpretations.
Over time, the law became lengthy, layered and difficult for ordinary taxpayers to read. Many provisions were scattered, cross-referenced and heavily dependent on technical interpretation.
The Income-tax Act, 2025 attempts to address this by:
- using simpler language;
- consolidating provisions;
- reducing excessive cross-referencing;
- removing redundant provisions;
- incorporating provisos and explanations into the main text;
- using tables and formulas wherever possible;
- improving structural clarity; and
- aligning the law with a more modern compliance framework.
One important point must be clearly understood: the new Act largely reorganises and simplifies the law. It does not mean that every tax principle has been replaced.
Structural Simplification: Fewer Sections, Fewer Rules, Fewer Forms
One of the most visible changes is the reduction in volume and complexity.
As explained in the transition FAQ, the Income-tax Act, 2025 contains 536 sections and 16 schedules, compared to 819 sections and 14 schedules under the 1961 Act. Similarly, the Income-tax Rules have been reduced from 511 rules with 399 forms to 333 rules with 190 forms.
This does not mean that important compliance requirements disappear. It means that the law has been rewritten in a more organised and readable structure.
For businesses, companies and professionals, this simplification can reduce confusion, but professional review will still remain important, especially in matters involving tax notices, reassessments, refunds, TDS, appeals and business restructuring.
For expert support in filing returns and handling CPC-related issues, taxpayers may refer to our ITR Filing & CPC Notice Reply Services.
Does Repeal of the 1961 Act Make Old Proceedings Invalid?
No. This is one of the most important principles of transition.
The repeal of the Income-tax Act, 1961 does not invalidate actions already taken under the old Act. Assessments, notices, appeals, refunds, penalties, approvals and other proceedings relating to years before 1 April 2026 continue to remain valid.
For example, if an assessment for AY 2023-24 was completed under the Income-tax Act, 1961, it will continue to remain valid even after the Income-tax Act, 2025 comes into force.
Similarly, if a reassessment notice, penalty proceeding, rectification proceeding, appeal or revision relates to a period governed by the old Act, it will continue under the old Act, unless specifically provided otherwise.
This continuity is the backbone of the transition framework.
Taxpayers facing old income-tax demands or pending notices may consider professional assistance through our Income Tax Demand Notice Reply & Response Service.
Section 536: The Heart of the Transition Framework
The most important transitional provision in the Income-tax Act, 2025 is Section 536, which deals with repeal and savings.
Section 536 ensures that the old law and the new law can operate together during the transition period without creating legal uncertainty.
Broadly, Section 536 provides that:
- proceedings relating to tax years before 1 April 2026 will continue under the old Act;
- old rights, benefits, obligations and liabilities will not automatically disappear;
- terminology between both Acts will be aligned where necessary;
- old approvals, registrations, recognitions and schemes may continue if not inconsistent with the new Act;
- pending assessments, reassessments, rectifications, penalties, revisions and appeals relating to old years will continue under the Income-tax Act, 1961; and
- the repeal of the old Act will not create a vacuum.
Further, where any unforeseen issue is not directly covered in the specific saving clauses, Section 6 of the General Clauses Act, 1897 will apply. This is important because Section 6 generally protects accrued rights, liabilities, penalties, investigations and legal proceedings unless a contrary intention appears.
In simple terms, Section 536 ensures that the transition is legally stable and administratively workable.
Assessment Year Is Going, Tax Year Is Coming
Under the Income-tax Act, 1961, taxpayers were familiar with two expressions:
- Previous Year – the year in which income is earned; and
- Assessment Year – the year in which income is assessed or return is filed.
This often created confusion. For example, income earned during FY 2025-26 is assessed in AY 2026-27.
Under the Income-tax Act, 2025, the term “Tax Year” is introduced. It replaces the concept of “Previous Year” and removes the separate “Assessment Year” reference for future years.
In simple words:
| Period of Income | Governing Law | Reference |
|---|---|---|
| 1 April 2025 to 31 March 2026 | Income-tax Act, 1961 | AY 2026-27 |
| 1 April 2026 to 31 March 2027 | Income-tax Act, 2025 | Tax Year 2026-27 |
So, there is no missing year and no overlap. Income earned up to 31 March 2026 will continue to be governed by the Income-tax Act, 1961. Income earned from 1 April 2026 onwards will be governed by the Income-tax Act, 2025.
Will Businesses Need to Change Their Accounting Year?
No. Businesses do not need to change their accounting period merely because the concept of “Tax Year” has been introduced.
The Tax Year is aligned with the Financial Year. Therefore, businesses can continue to prepare their financial statements for the period 1 April to 31 March, as they are already doing.
However, if a new business is started during the financial year, or a new source of income comes into existence during the year, the Tax Year may be shorter than twelve months.
For example, if a business is started on 1 December 2026, its Tax Year will run from 1 December 2026 to 31 March 2027.
This is broadly similar to the earlier concept where a previous year could be shorter in the year of commencement of business or source of income.
PAN, TAN, Faceless Proceedings and Existing Systems Will Continue
Taxpayers do not need to worry about their basic tax identity and administrative framework.
The following will continue under the Income-tax Act, 2025:
- PAN;
- TAN;
- faceless assessment;
- faceless appeal framework;
- existing administrative systems;
- old approvals and registrations, subject to consistency with the new Act;
- old circulars, notifications and instructions, to the extent they do not conflict with the new Act; and
- schemes designed to reduce direct interaction between taxpayers and tax officers.
This continuity is important for businesses, professionals, deductors and NRIs because tax administration cannot restart from zero merely because a new law has been enacted.
What Happens to Old Circulars, Notifications and Instructions?
Circulars, notifications, instructions and approvals issued under the Income-tax Act, 1961 will continue if they are not inconsistent with the Income-tax Act, 2025.
For example, if a CBDT circular under an old TDS section explains a concept that continues under the corresponding provision of the new Act, such guidance may continue to remain relevant.
This principle is important for tax professionals, CFOs, finance teams and compliance teams because many practical interpretations depend not only on the bare Act but also on departmental circulars and instructions.
Parallel Operation of Old and New Law: What It Means Practically
From 1 April 2026, the Income-tax Act, 2025 will come into force. However, the Income-tax Act, 1961 will continue to apply for earlier years.
This means both laws will practically run in parallel for some time.
For example:
- ITR for FY 2025-26 will be filed as AY 2026-27 under the Income-tax Act, 1961.
- Advance tax for FY 2026-27 will be paid under the Income-tax Act, 2025.
- Pending assessments for earlier years will continue under the 1961 Act.
- Appeals relating to earlier assessment years will continue under the old Act.
- Old refund claims and old tax liabilities will not disappear.
- Updated returns for earlier assessment years may still be governed by the old Act, subject to applicable time limits.
For taxpayers who need to correct earlier income-tax returns, our ITR-U Filing & Updated Return Service may be useful.
Practical Checklist for Taxpayers and Businesses
Taxpayers should keep the following points in mind during the transition:
- Do not assume old proceedings are closed
Pending notices, appeals, reassessments and penalties relating to earlier years may continue under the 1961 Act. - Select the correct year on the e-filing portal
For FY 2025-26, the relevant reference will be AY 2026-27. For FY 2026-27, the relevant reference will be Tax Year 2026-27. - Map old sections with new sections carefully
Tax teams should maintain a section-mapping chart for TDS, return filing, reassessment, penalties, appeals and deductions. - Do not ignore old demands or refund claims
Old tax liabilities remain payable and old refund rights continue, subject to law. - Review contracts and compliance formats
Companies and businesses should update tax clauses, invoice formats, TDS references, advisory notes and internal checklists. - Train finance and accounts teams
Staff handling TDS, advance tax, ITR filing, notices and portal compliance must understand the old Act/new Act boundary. - Take professional advice in transition-sensitive matters
Notices, reassessment, demand recovery, penalty, refund, updated return and tax litigation matters should be reviewed carefully.
For business owners, companies and professionals who require structured tax planning during this transition, our Business Consulting & Tax Planning Service can provide practical guidance.
Key Takeaway: The New Act Is a Reset in Structure, Not a Break in Continuity
The Income-tax Act, 2025 should not be viewed as a sudden tax shock. It is better understood as a structural reset of India’s direct tax law.
The philosophy of transition is based on three principles:
- Simplification – make the law easier to read and apply.
- Continuity – protect old rights, obligations and proceedings.
- Certainty – avoid legal gaps during the shift from the 1961 Act to the 2025 Act.
For taxpayers, the message is clear: the law is changing, but the transition is designed to be seamless. Old years will continue under the old Act. New income periods from 1 April 2026 onwards will be governed by the new Act. PAN, TAN, faceless systems, approvals, circulars and pending proceedings will continue with necessary legal alignment.
The real compliance challenge will be practical: choosing the correct year, quoting the correct section, understanding the old-new law boundary, and responding correctly to notices and portal requirements.
For professional assistance on Income-tax Act, 2025 transition, ITR filing, old tax demands, updated returns or section mapping, you may schedule a consultation with CA Alok Kumar.
Disclaimer
This article is for general educational and informational purposes only. It is based on the transition framework explained in the Income Tax Department/CBDT FAQ on interplay and transition from the Income-tax Act, 1961 to the Income-tax Act, 2025. Readers should verify the latest statutory provisions, rules, notifications and portal utilities before taking any action. For case-specific advice, professional consultation is recommended.
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