India’s income-tax framework has undergone a significant legislative transition with the introduction of the Income-tax Act, 2025, effective from April 1, 2026. The new Act replaces the Income-tax Act, 1961, with the objective of simplifying statutory language, improving clarity, and making tax compliance easier to understand.
For individuals, businesses, accountants, payroll professionals, and finance teams, the transition raises an important practical question: which law should be followed for a particular tax year or transaction?
This guide highlights the major changes and provides a checklist to help taxpayers and finance professionals navigate the transition.
1. Why Was the New Income-tax Act Introduced?
Over several decades, the Income-tax Act, 1961 accumulated amendments, explanations, provisos, and cross-references that made its provisions increasingly complex.
The Income-tax Act, 2025 reorganises the law and uses more structured provisions, tables, and clearer language. The Income Tax Department explains that the reform is intended to simplify the law and improve readability, rather than to introduce a new tax merely because a replacement Act has been enacted.
Taxpayers must still check the applicable Finance Act, tax rates, rules, and notifications for the relevant period.
2. The Introduction of “Tax Year”
One of the most notable changes is the introduction of the term Tax Year, which replaces the “previous year” terminology used under the earlier Act. The new Act also discontinues the use of “assessment year” for tax years governed by the new framework.
For example:
- Tax Year 2026–27: Generally covers income earned from April 1, 2026, to March 31, 2027.
- Previous Year 2025–26: Refers to income earned from April 1, 2025, to March 31, 2026, under the earlier framework.
The new terminology is intended to reduce confusion caused by referring to income using one year and assessment using another. Businesses do not need to change their accounting year solely because of this terminology change.
3. Which Act Applies During the Transition?
The transition requires taxpayers to distinguish between income earned before April 1, 2026, and income earned from that date onward.
| Situation | Applicable framework |
|---|---|
| Income earned during FY 2025–26 | Income-tax Act, 1961 |
| Income earned during Tax Year 2026–27 | Income-tax Act, 2025 |
| Income-tax return for AY 2026–27 | Earlier Act and applicable rules |
| Advance tax for Tax Year 2026–27 | New Act and applicable rules |
| Proceedings relating to earlier tax years | Earlier Act, subject to applicable transitional provisions |
The Income Tax Department’s e-filing portal supports compliance under both Acts during the transition. Taxpayers should select the appropriate assessment year or tax year and the corresponding legal framework when filing returns or making payments.
4. What Happens to Pending Assessments and Tax Proceedings?
The introduction of the new Act does not automatically invalidate assessments, notices, appeals, refunds, or other rights arising under the earlier legislation.
The transitional provisions preserve the operation of the previous law for relevant earlier tax years and proceedings. For example, an assessment relating to AY 2024–25 does not automatically move to the new Act simply because proceedings continue after April 1, 2026.
Finance and tax teams should maintain records of the relevant assessment year, tax period, notices, submissions, and outstanding demands.
5. Practical Implications for Businesses and Finance Teams
The transition is not limited to tax-return filing. It also has implications for day-to-day accounting and compliance processes.
A. Review TDS and TCS Processes
Businesses should review applicable provisions, section references, forms, and reporting requirements under the new framework. Payroll teams and accounts-payable departments should use the relevant rules for the payment period.
B. Update Accounting and ERP Systems
Organisations using ERP systems or accounting software should assess whether tax codes, statutory references, report templates, and compliance checklists need updating. Historical transactions should retain the references applicable when those transactions occurred.
C. Review Tax Documentation
Maintain organised records of tax payments, deductions, reconciliations, returns, notices, and assessments. Clear period-wise documentation will be particularly important where transactions span the transition date.
D. Update Internal Procedures
Finance teams should update standard operating procedures, tax calendars, and internal guidance so employees can distinguish between the earlier and new frameworks.
6. Practical Compliance Checklist
Businesses and taxpayers can use the following checklist to manage the transition:
- Identify the tax year or assessment year relevant to each compliance activity.
- Confirm which Income-tax Act applies to the relevant period.
- Review the latest applicable tax rates, rules, notifications, and prescribed forms.
- Update TDS, TCS, payroll, and advance-tax procedures where required.
- Review accounting-system and ERP statutory references.
- Maintain historical tax records and documents relating to pending proceedings.
- Verify payment and return-filing selections on the official e-filing portal.
- Train relevant finance and accounts personnel on the new terminology and procedures.
7. Official Resources for Further Reference
For authoritative information, refer to these Income Tax Department resources:
- Income-tax Act, 2025: Objective and Scope FAQs
- General Questions and Tax Payment FAQs
- Income-tax Act, 2025: Official Resources and Downloads
Readers should consult the latest official guidance for their specific circumstances.
Conclusion
The Income-tax Act, 2025 represents an important change in the structure and presentation of India’s direct-tax legislation. The introduction of the Tax Year concept and the reorganisation of statutory provisions are intended to improve clarity and simplify compliance.
For finance professionals, the immediate priority is to manage the transition correctly: apply the appropriate law to the relevant period, update internal procedures, maintain reliable documentation, and verify current requirements through official sources.
A structured approach will help businesses and taxpayers navigate the new framework while minimising errors in tax reporting and compliance.
Disclaimer: This article is for general informational purposes only and should not be treated as legal or tax advice. Taxpayers should verify applicable provisions, rules, notifications, and deadlines with the Income Tax Department or a qualified tax professional.