For millions of Indian taxpayers, April 1 marks more than just the start of a new financial year—it's the day when fresh tax rules come into force. This year, April 1, 2026, is historic. The Income Tax Act 1961, which has governed India's direct tax system for over six decades, will be replaced by the Income Tax Act 2025. Along with this legislative overhaul, Budget 2026 has introduced several compliance-friendly changes: extended ITR deadlines for certain categories, a longer window to file revised returns, and a sharp hike in Securities Transaction Tax (STT) on derivatives trading.
Whether you're a salaried employee filing ITR-1, a freelancer using ITR-4, or an F&O trader worried about rising costs, understanding these changes is critical to staying compliant and avoiding penalties.
- ITR-3 and ITR-4 filing deadline extended to August 31 for non-audit cases from FY 2025-26 onwards
- Revised return window under Section 139(5) now open till March 31 (additional fee of ₹5,000 applies after December 31)
- STT on futures increased to 0.05% and options to 0.15% effective April 1, 2026
- Income Tax Act 2025 replaces 1961 Act from April 1, 2026; introduces 'Tax Year' concept and simplified language
1. Income Tax Act 2025 Replaces 1961 Law from April 1, 2026
The Income Tax Act 2025 will come into effect from April 1, 2026, replacing the Income Tax Act 1961. This marks the implementation of a new tax framework, replacing a six-decade-old Income Tax Act. The new law aims to simplify tax provisions, reduce litigation, and make compliance easier for taxpayers by streamlining language and removing redundant clauses.
What Changes in the New Act?
The Income Tax Act 2025 consolidates 536 sections across 23 chapters and introduces simplified concepts like the 'Tax Year', replacing the confusing previous year and assessment year distinction. For taxpayers, this means:
- Simpler terminology: Instead of filing for 'Assessment Year 2026-27' based on 'Financial Year 2025-26', you will file for 'Tax Year 2026-27'.
- No change in tax slabs: Income tax slabs for individuals remain unchanged for FY 2026-27.
- Revenue neutrality: The Income Tax Act 2025 is revenue-neutral, meaning it does not change existing tax rates or policies at the point of enactment. Any modifications to tax rates, slabs, exemptions, or deductions will continue to be made through annual Finance Acts.
For most salaried individuals, the transition will be seamless. Your employer will adjust, and the Income Tax Calculator on TaxFetch will reflect the new framework automatically.
2. New ITR Filing Deadlines from April 1, 2026: Who Gets More Time?
One of the most taxpayer-friendly changes in Budget 2026 is the extension of ITR filing deadlines for specific categories.
ITR-1 and ITR-2: Deadline Remains July 31
The due date for ITR-1 and ITR-2 filings remains July 31. If you are a salaried employee, pensioner, or individual earning income from house property, capital gains, or dividends, your deadline has not changed.
ITR-3 and ITR-4: Deadline Extended to August 31
The government has extended the deadline for filing ITR-3 and ITR-4 for non-audit taxpayers to August 31, giving them one additional month to complete accounts and paperwork. The revised ITR deadlines apply from April 1, 2026, starting with the assessment year 2026-27.
This applies to:
- Professionals (doctors, lawyers, consultants, CAs)
- Business owners not subject to tax audit
- Partners of firms (non-audit cases)
- Certain trusts
Budget 2026 brought good news for businesses and professionals: the deadline for filing returns where audit is NOT required has been extended from July 31 to August 31.
Tax Audit Cases: Deadline Remains October 31
The deadline for tax audits continues to be October 31. Companies and taxpayers required to furnish Form 3CD and tax audit reports must still file by this date.
Real-Life Example
Rajesh runs a small consultancy in Pune with an annual turnover of ₹45,00,000. He is not required to undergo a tax audit. Earlier, he had to scramble to finalize his books by July 31. From FY 2025-26 onwards, he gets until August 31 to file ITR-4, reducing last-minute stress and giving him time to claim all eligible deductions. He can use the Income Tax Calculator to estimate his tax liability before filing.
3. Revised Return Window Extended to March 31 Under Section 139(5)
Made a mistake in your ITR? Forgot to claim a deduction? Received a revised Form 16 after filing? Section 139(5) allows you to file a revised return to correct errors.
Old Rule vs New Rule
| Aspect | Old Rule (Till FY 2024-25) | New Rule (From FY 2025-26) |
|---|---|---|
| Revised Return Deadline | December 31 of AY | March 31 of AY |
| Additional Fee (if filed after Dec 31) | Not Applicable | ₹5,000 |
| Number of Revisions Allowed | Unlimited | Unlimited |
Taxpayers will get more time to correct errors in their returns: the deadline for filing a revised return has been extended to March 31 of the relevant assessment year, though an additional fee will apply if the revision is filed after December 31.
The due date to file a revised return was extended to 12 months from the end of the relevant tax year from the existing 9 months. Therefore, the new due date for filing revised returns is March 31. Taxpayers are also required to pay an additional fee to file revised return after December 31.
How This Helps You
Let's say you filed your ITR for FY 2025-26 on July 20, 2026. On January 15, 2027, you realize you forgot to claim an ₹80,000 deduction under Section 80C. Under the old rule, you could only revise till December 31, 2026—you'd have missed the window. Now, you can revise till March 31, 2027 by paying ₹5,000 as a late fee, saving yourself from a potential tax demand and notice.
You can check your TDS credits using the Form 26AS / TDS Fetch Tool before filing your revised return to ensure all deductions are claimed correctly.
4. STT Hike on Futures and Options: What F&O Traders Must Know
If you trade in equity derivatives, brace yourself. Budget 2026 has imposed one of the steepest STT hikes in two decades.
Old vs New STT Rates (Effective April 1, 2026)
| Transaction Type | Old STT Rate | New STT Rate (from April 1, 2026) | % Increase |
|---|---|---|---|
| Futures (Sell Side) | 0.02% | 0.05% | 150% |
| Options (Premium on Sell) | 0.10% | 0.15% | 50% |
| Options (On Exercise) | 0.125% | 0.15% | 20% |
From April 2026, STT on futures transactions will rise from 0.02% to 0.05%, while STT on options will increase from 0.1% to 0.15%. As per Budget 2026, the STT rates have been hiked to 0.05% on futures and 0.15% on options.
Why the Hike?
The measure aims to curb excessive speculation and 'betting-style' behaviour in the derivatives segment, particularly among uninformed retail traders. SEBI data highlighted that nearly 90-93% of individual F&O traders incur losses.
Real-World Impact on Traders
Let's calculate the impact on a retail trader:
Scenario: You sell 1 lot of Nifty futures at 25,000 (lot size 25).
- Contract Value: 25,000 × 25 = ₹6,25,000
- Old STT: 0.02% of ₹6,25,000 = ₹125
- New STT: 0.05% of ₹6,25,000 = ₹312.50
- Increase per trade: ₹187.50
A trader executing 10 contracts per day would now pay an additional ₹3,000 in STT daily—or roughly ₹75,000 per month (assuming 25 trading days).
For high-frequency traders and scalpers, this can turn profitable strategies into loss-making ones. If you trade in stocks or derivatives, use the Stock Profit Calculator and Capital Gain Calculator to factor in the new STT before executing trades.
5. Updated Return Window Under Section 139(8A): Last Chance to Comply
Missed filing your ITR altogether? Or filed but forgot to declare income? Section 139(8A) allows you to file an updated return (ITR-U) even years after the deadline.
What's New in Budget 2026?
As per Budget 2026 proposals, updated return can be filed even after the beginning of reassessment proceedings, with a 10% additional tax, apart from the existing additional taxes applicable for filing updated return. This amendment is proposed to reduce litigations. In reassessment proceedings, the assessing officer can only refer to updated returns.
You can now file ITR-U even if reassessment has started—provided you pay a 10% additional tax over and above the normal penalty.
ITR-U Deadline and Penalty Structure
It can be filed within 4 years from the end of relevant assessment year. The penalty structure is:
- Within 12 months: 25% of tax + interest
- Within 24 months: 50% of tax + interest
- Within 36 months: 60% of tax + interest
- Within 48 months: 70% of tax + interest
For example, if you never filed ITR for FY 2022-23 (AY 2023-24), you have until March 31, 2027 to file ITR-U. This can help you avoid prosecution and get bank loans, visas, and other financial services that require ITR proof. Use the Bank Statement Analyser to reconcile your income before filing an updated return.
6. Other Key Tax Changes from April 1, 2026
TCS Rate Rationalization
Budget 2026 rationalized TCS rates aimed at easing compliance. The TCS rate on sale of alcoholic liquor for human consumption, sale of scrap, and sale of minerals were increased to 2% from 1%. TCS rate on sale of tendu leaves and remittance under LRS for education and medical treatment has been reduced to 2% from 5%. TCS on remittance under LRS for overseas tour package has been reduced to a single flat rate of 2% without threshold.
Disallowance of Interest Deduction Against Dividend Income
Section 57 of the Income Tax Act 1961 allowed a deduction for interest expenses incurred to earn dividend or mutual fund income, subject to a 20% ceiling. The Income Tax Act 2025 proposes a significant change, as section 93(2) will completely disallow any deduction for interest incurred in generating dividend or mutual fund income.
This means if you took a loan to invest in dividend-paying stocks or equity mutual funds, you cannot claim interest as a deduction from FY 2026-27 onwards.
MAT Rate Reduction
Ending further accumulation from April 1, 2026, MAT is proposed to be made final tax. In line with this change, the rate of final tax will be reduced to 14% from the current MAT rate of 15%.
7. What You Should Do Before April 1, 2026
Here's a quick action checklist:
- Identify your ITR form: Use ITR-1 or ITR-2 if you're salaried (deadline July 31). Use ITR-3 or ITR-4 if you have business/professional income (deadline August 31).
- Verify Form 26AS and AIS: Check if all your TDS, advance tax, and income sources are reflected correctly using the Form 26AS / TDS Fetch Tool.
- Claim all deductions: HRA, Section 80C, 80D, home loan interest—ensure nothing is missed. Use the HRA Calculator to maximize your exemption.
- If you trade F&O: Recalculate your strategy considering the new STT rates. Use the Stock Profit Calculator to model post-STT profitability.
- File on time: Avoid late fees (₹1,000 to ₹5,000) and loss of carry-forward of losses.
- If you made a mistake: File a revised return by March 31 (additional ₹5,000 fee after December 31).
Frequently Asked Questions (FAQs)
What is the new ITR filing deadline for ITR-3 and ITR-4 from April 1, 2026?
From April 1, 2026, the ITR filing deadline for ITR-3 and ITR-4 (non-audit cases) has been extended to August 31 from the previous July 31 deadline. This applies to professionals, business owners, and trusts who are not required to get their accounts audited. The deadline for ITR-1 and ITR-2 remains July 31. This change is effective for FY 2025-26 (AY 2026-27) onwards and aims to reduce compliance pressure on small businesses.
What is the new revised return deadline under Section 139(5) from April 2026?
Budget 2026 has extended the deadline to file revised returns under Section 139(5) from December 31 to March 31 of the relevant assessment year. However, if you file a revised return after December 31, you will have to pay an additional fee of ₹5,000. This extended window gives taxpayers more time to correct errors or omissions in their original ITR without facing severe penalties.
What are the new STT rates on futures and options from April 1, 2026?
Budget 2026 increased STT on equity derivatives effective April 1, 2026. STT on futures has been hiked from 0.02% to 0.05% (a 150% increase), and STT on options has increased from 0.1% to 0.15%. These changes aim to curb excessive speculation in F&O trading. The hike significantly impacts high-frequency traders and retail investors engaged in derivatives, increasing their transaction costs substantially.
When does the Income Tax Act 2025 come into effect?
The Income Tax Act 2025 comes into effect from April 1, 2026, replacing the 65-year-old Income Tax Act 1961. The new Act simplifies language, removes redundant provisions, and introduces the concept of 'Tax Year' replacing the previous year and assessment year distinction. Importantly, tax slabs for individuals remain unchanged for FY 2026-27, but the compliance framework and procedural requirements have been modernized.
Can I still file an updated return if I miss the revised return deadline?
Yes, you can file an updated return under Section 139(8A) within 48 months from the end of the relevant assessment year, even if you missed the original and revised return deadlines. However, you will have to pay additional tax ranging from 25% to 70% depending on when you file. Budget 2026 has also allowed filing of updated returns even after reassessment proceedings begin, with an additional 10% tax penalty.
Conclusion
April 1, 2026 marks a watershed moment in India's taxation history. The rollout of the Income Tax Act 2025, extended ITR deadlines for ITR-3 and ITR-4 filers, a three-month longer revised return window, and the steep STT hike on derivatives collectively reshape the compliance and trading landscape. Salaried taxpayers benefit from simplified language and extended revision windows, while F&O traders must recalibrate strategies to account for higher transaction costs. Staying informed and filing on time is not just about avoiding penalties—it's about maximizing refunds, claiming every rupee you're entitled to, and ensuring financial peace of mind. Use TaxFetch's suite of tax tools to calculate, file, and stay compliant effortlessly this financial year.