New Income Tax Rules From April 2026 Introduce ‘Tax Year’ and Higher STT

India’s taxation framework is set to undergo a significant overhaul from April 1, 2026, as the newly enacted Income-tax Act, 2025 replaces the long-standing Income-tax Act, 1961. The reform marks the most comprehensive restructuring of India’s tax legislation in more than six decades.

According to the government, the new law simplifies tax provisions by using clearer language and modernised terminology. It also introduces several procedural changes affecting individuals, businesses, and investors, including new filing deadlines, an extended window for revised returns, and higher Securities Transaction Tax (STT) rates on derivatives trading.

Tax professionals say the updated framework aims to make compliance easier while improving efficiency in tax administration.

Introduction of the ‘Tax Year’ Concept

Replacing Previous Year and Assessment Year

One of the most notable reforms introduced in the new law is the replacement of the traditional dual system of “previous year” and “assessment year” with a single period known as the “Tax Year.”

“‘Tax Year’ Concept Introduced”

Under the earlier system, taxpayers often faced confusion due to the difference between the year in which income was earned (previous year) and the year in which it was assessed and taxed (assessment year).

Under the new system:

• Income earned and tax liability will be recorded in a single unified period called the Tax Year

• The change is expected to simplify tax filing and improve clarity for taxpayers

Experts believe this modification will make the compliance process easier, particularly for individuals and small businesses.

Income Tax Slabs Remain Unchanged

No Change in Personal Tax Rates

Despite the structural changes in tax administration, the government has not altered the existing income tax slab rates for individual taxpayers.

“Income Tax Slabs Remain Same”

Both the old tax regime and the new concessional tax regime will continue with the same slab rates. As a result, the overall tax burden for most individuals will remain unchanged.

This decision provides stability for taxpayers while allowing the government to focus on simplifying procedures rather than increasing tax rates.

Revised Deadlines for Filing Income Tax Returns

New Timelines for Different Categories of Taxpayers

Another important reform under the new tax law involves revised deadlines for filing income tax returns (ITR).

“New ITR Filing Deadlines”

The new schedule will apply as follows:

Individual Taxpayers (Simple Returns)

• Taxpayers filing ITR-1 or ITR-2 will continue to have the deadline of July 31.

Business and Professional Taxpayers

• Taxpayers engaged in business or profession whose accounts do not require audit will now have time until August 31 instead of July 31.

Companies and Audited Accounts

• Companies and taxpayers requiring audit must file returns by October 31.

Special Cases

• Certain categories covered under specific provisions will have a November 30 filing deadline.

The extended deadline for non-audit business taxpayers is expected to provide additional time for financial documentation and compliance.

Extended Window for Revised Returns

Taxpayers Get More Time to Correct Returns

The government has also expanded the timeframe available for taxpayers to revise previously filed returns.

“Revised Return Window Extended”

Earlier rules allowed taxpayers to revise their return within nine months after the end of the tax year.

Under the new law:

• The revision period has been extended to 12 months

However, taxpayers revising their returns after the initial nine-month window will have to pay a fee.

Fees for Late Revision

• ₹1,000 if total income is up to ₹5 lakh

• ₹5,000 if income exceeds ₹5 lakh

This extension offers taxpayers more flexibility to correct errors or include missed disclosures.

Changes in Securities Transaction Tax (STT)

Higher Tax on Derivatives Trading

The government has also increased the Securities Transaction Tax (STT) applicable to futures and options trading.

The revised rates are:

• STT on sale of options: increased from 0.10 percent to 0.15 percent

• STT on futures trading: increased from 0.02 percent to 0.05 percent

STT is a tax levied on the purchase and sale of securities listed on stock exchanges such as the National Stock Exchange of India and the Bombay Stock Exchange.

Market experts believe the revision aims to streamline derivatives taxation while maintaining regulatory oversight of speculative trading.

Other Tax Changes Under the New Law

Revisions in TCS Rates

The government has also revised Tax Collected at Source (TCS) rates on several categories of transactions. While the specific changes vary across sectors, the revisions are designed to improve tax compliance and monitoring.

Employer-Provided Transport Exemption

Another notable clarification is that employer-paid travel between home and office will not be treated as a taxable benefit.

This change could benefit employees receiving transportation support from their employers.

A Major Shift in India’s Tax Administration

Simplification and Modernisation

The replacement of the Income-tax Act, 1961 with the Income-tax Act, 2025 represents one of the most significant reforms in India’s tax administration.

Key objectives of the new law include:

• Simplifying tax language and structure

• Reducing compliance complexity

• Improving transparency and efficiency

• Aligning tax administration with digital governance initiatives

The reforms also come at a time when the government is increasingly emphasising digital tax filing systems and automated compliance monitoring.

Conclusion

The implementation of the Income-tax Act, 2025 from April 1, 2026 marks a major transformation in India’s tax framework after more than six decades. By introducing the concept of a unified “Tax Year,” extending return filing timelines, increasing the revision window, and revising STT rates, the government aims to create a simpler and more efficient taxation system.

While the tax slab rates remain unchanged, the procedural improvements are expected to reduce confusion for taxpayers and streamline compliance. As India continues modernising its financial and digital infrastructure, the new tax law could play a key role in making the country’s taxation system more transparent, accessible, and aligned with global best practices.