The Great Tax Transition: Income-tax Act 1961 vs. 2025—Which Law Applies to Your July 2026 ITR?

If you open any Indian financial news portal today, you will see headlines celebrating a historic milestone: The Income-tax Act, 2025 is officially live.

For the first time in over six decades, the sprawling, amendment-laden Income-tax Act of 1961 has been repealed. In its place sits a newly consolidated, simplified tax code comprising 536 sections designed to cut down legal jargon and make filing direct taxes easier for the modern citizen. 1

But as you sit down with your Form 16, bank statements, and tax portals to file your annual Income Tax Return (ITR) in July 2026, you are hit with a confusing reality.

Your tax filing portal references "Assessment Year 2026-27." Your employer's tax certificate references "Financial Year 2025-26." Meanwhile, direct tax consultants are telling you to format your current salary allocations under the "Tax Year 2026-27" guidelines of the new 2025 Act.

Suddenly, you are caught in a legal timeline squeeze. You must ask:

"Which law actually applies to the tax return I am filing right now? Is it the newly simplified 2025 Act, or am I still bound by the old 1961 Act?"

The short answer is: Both laws are running concurrently on your screen right now.

For software developers, tech professionals, freelancers, and startup founders between the ages of 18 and 40, mismanaging this transition can lead to rejected returns, defective filing notices, or missed tax-saving opportunities.

To navigate this historic shift cleanly, you must master the D.U.A.L. Law Framework:

1. •D - Date of Income (The Anchor): Trace when your money was earned to select the law.
2. •U - Underlying Sections (The Mapping): Align old sections with the new simplified sections.
3. •A - Assessment Year vs. Tax Year: Decipher the vocabulary changes in your ITR.
4. •L - Litigation & Compliance Continuity: Understand how past disputes and notices are prosecuted.

Let’s dive deep into this transition to ensure you file accurately and transition your tax planning seamlessly.

1. D - Date of Income (The Anchor)

The single most important rule of the transition is: The date of earning anchors the applicable law.

Although the Income-tax Act, 2025 became the sole active direct tax code of India on April 1, 2026, it does not apply retroactively to income earned before its enactment. 1

Direct tax law operates on the principle that the law in force on the first day of an assessment period governs the income earned in the preceding earning period. Let's trace how this splits your obligations in July 2026:

The Earning Period: April 1, 2025 to March 31, 2026

• •The Status: You earned this income in the past.
• •The Applicable Law: The Income-tax Act, 1961 (specifically, the provisions in force as of March 31, 2026, as updated by Finance Act, 2025).
• •What this means for you: When you file your ITR in July 2026, you are reporting this income. Therefore, your tax slabs, deduction limits (such as the standard ₹1.5 Lakh limit under Section 80C, Section 80D health insurance limits), and capital gains definitions are governed entirely by the old 1961 Act.

The Earning Period: April 1, 2026 to March 31, 2027

• •The Status: You are earning this income right now in the current period.
• •The Applicable Law: The Income-tax Act, 2025.
• •What this means for you: Your current salary TDS, business advance taxes, and current investments are governed by the new Act. When you file the return for this income in mid-2027, you will use the new Act's forms and simplified sections.

[!IMPORTANT] The Concurrent Run In July 2026, your tax actions are split:

1. •Filing (Backward-looking): Governed by the 1961 Act.
2. •Planning & Advance Tax (Forward-looking): Governed by the 2025 Act.

2. U - Underlying Sections (The Mapping)

One of the main goals of the Income-tax Act, 2025 was to clean up the numbering structure. Over 64 years, the 1961 Act had accumulated bizarre sections like "Section 80JJAA" or "Section 115BAC," making it look like code soup.

The 2025 Act re-arranged all direct tax provisions into a clean, sequential structure of 536 sections across 23 chapters. 2

Because the sections have changed, you cannot quote new section numbers on your July 2026 tax returns. Let's map how key provisions look across the two Acts:

Salaried Exemptions and Slab Rates

• •Old ITR (Filing now in July 2026): If you are filing under the Default Tax Regime, you are using the old Section 115BAC structure that existed for FY 2025-26. If you chose the Old Tax Regime, you are claiming HRA under Section 10(13A) and LTA under Section 10(5).
• •New Tax Year (Planning now for FY 2026-27): The new Act consolidates slab rates into a streamlined schedule. The old "Section 115BAC" has been re-indexed. Standard salary deductions and simplified tax rates are built into the primary sections of the new code, reducing the reliance on complex sub-clauses.

Deductions for Salaried and Freelancers

• •Old ITR (Filing now): You can claim Section 80C (PPF, ELSS, LIC), Section 80D (Medical Insurance), and Section 24(b) (Home Loan Interest) if you are in the Old Tax Regime.
• •New Tax Year (Planning now): The 2025 Act heavily disincentivizes the old deduction system, migrating the majority of taxpayers to a simplified flat rate code with minimal deductions.

Key Section Mappings:

3. A - Assessment Year vs. Tax Year

The most visible change in the Income-tax Act, 2025 is the complete removal of the terms Previous Year (PY) and Assessment Year (AY). 3

Why the Old System Was Confusing

Under the 1961 Act, taxpayers had to mentally translate two separate years:

• •The year you made the money was the Previous Year (PY).
• •The year you declared and filed tax on that money was the Assessment Year (AY).
• •Example: If you earned money between April 2024 and March 2025 (PY 2024-25), you filed your tax return in July 2025 under AY 2025-26. This dual-year vocabulary was a constant source of error for retail taxpayers.

How the New System Simplifies It

The Income-tax Act, 2025 eliminates this terminology mismatch. It introduces a single, unified reference: The Tax Year. 3

• •The Tax Year is the 12-month period running from April 1 to March 31 in which the income is earned. 3
• •Example: The period from April 1, 2026, to March 31, 2027, is simply Tax Year 2026-27.
• •When you file the tax return for this period in mid-2027, your forms, tax certificates, and portal entries will all refer to Tax Year 2026-27. There is no second "Assessment Year" to track.

The July 2026 Portal View

Because you are filing in July 2026 for the income earned last year, the tax portal will display the old terminology:

• •Income Period: FY 2025-26 (Financial Year)
• •Assessment Year: AY 2026-27
• •Do not look for "Tax Year 2025-26" on the forms; the portal is running the legacy 1961 Act system for this filing window.

4. L - Litigation & Compliance Continuity

A common point of anxiety during major tax transitions is past disputes. "If the 1961 Act is repealed, what happens to the tax notice I received last year? Or the rectification request I filed for my 2024 tax return?"

The Income-tax Act, 2025 handles this through robust Transitional Provisions (Section 530 onwards). 3

The Legal Rule of Continuity

Under direct tax transition guidelines:

1. •Past Proceedings: Any notices, audits, assessments, appeals, or prosecution proceedings initiated under the 1961 Act prior to April 1, 2026, will continue as if the 1961 Act was never repealed. 3
2. •Past Income Audits: If the tax department decides to audit or reopen your tax assessment for a year prior to April 1, 2026 (e.g., auditing your FY 2023-24 return in late 2026), the audit will be conducted under the rules, tax rates, and penalty provisions of the Income-tax Act, 1961.
3. •Carry-Forward Benefits: Any business losses, capital losses, or unabsorbed depreciation you accumulated under the old Act are legally preserved. They carry forward into the 2025 Act era, subject to the same time limits (e.g., 8 years for business losses).

Case Study: Ananya’s Concurrent Tax Workflow

To see the concurrent application of both tax acts, let’s follow Ananya, a 29-year-old UX designer in Mumbai.

Ananya's Financial Scenario in July 2026:

• •Salaried Job: Was employed at a design agency from April 2025 to September 2025. She earned ₹6,00,000 in salary, with TDS deducted under the old rules.
• •Freelance Consultant: Left her job to consult independently from October 2025 onwards. She earned ₹12,00,000 in consultancy fees between October 2025 and March 2026.
• •Ongoing Business: She has active consulting contracts for the ongoing year (April 2026 to March 2027) projected at ₹30,00,000.

Let’s trace how Ananya applies the D.U.A.L. Law Framework in July 2026:

graph TD
    A[Ananya's Tax Work in July 2026] --> B[1. Filing for Past Year: FY 2025-26]
    A --> C[2. Planning for Current Year: FY 2026-27]
    
    B --> B1[Governed by Income-tax Act, 1961]
    B1 --> B2[Uses AY 2026-27 Forms]
    B1 --> B3[Applies Section 44ADA Presumptive Tax]
    B1 --> B4[Claims Section 80C Deductions]
    
    C --> C1[Governed by Income-tax Act, 2025]
    C1 --> C2[Uses Tax Year 2026-27 Terminology]
    C1 --> C3[Applies Simplified Slab Schedule]
    C1 --> C4[Restructures Contracts for New Business Code]

Action 1: Filing the ITR (Governed by the 1961 Act)

In July 2026, Ananya logs onto the Income Tax e-filing portal to file her return.

• •Terminology: She selects AY 2026-27 (corresponding to FY 2025-26).
• •Salaried Income: She enters her salaried income of ₹6,00,000 and standard deduction under the old Section 16(ia).
• •Freelance Income: To declare her ₹12,00,000 freelance earnings, she opts for presumptive taxation under the old Section 44ADA. She declares 50% (₹6,00,000) as taxable income, with no expense tracking required.
• •Tax Saving: She claims a deduction of ₹1,50,000 under the old Section 80C for her PPF investments made in January 2026.
• •Ananya is acting completely under the rules of the legacy 1961 Act.

Action 2: Advance Tax and Current Planning (Governed by the 2025 Act)

Concurrently, Ananya must pay her first quarter advance tax for her ongoing freelance earnings (earned between April 1, 2026, and June 30, 2026).

• •Terminology: She calculates tax for Tax Year 2026-27.
• •Slab Rates: She applies the simplified direct slab rates introduced under the new Income-tax Act, 2025.
• •Deductions: She knows that for this ongoing year, standard 80C deductions are not available under the simplified code she is using. She calculates her advance tax payments accordingly.
• •Ananya is acting completely under the rules of the new 2025 Act.

Comparison of Direct Tax Frameworks in India

To understand the core differences between the two systems running on your screen, bookmark this comparative matrix:

The July 2026 Tax Season Action Checklist

To make sure you navigate this transition season without tax notices or compliance errors, follow this checklist before hitting submit:

• • Verify Your AY: Confirm that your tax return for July 2026 is filed under AY 2026-27 (covering income earned between April 1, 2025, and March 31, 2026).
• • Apply Old Section Numbers: Ensure you are quoting the old sections (e.g., Section 80C, Section 80D, Section 24b) on your return forms. The new 2025 Act index numbers do not apply to this filing.
• • Reconcile Form 26AS & AIS: Check your Annual Information Statement (AIS) for FY 2025-26 to verify that all TDS deducted by your employers or clients matches your return.
• • Map Ongoing Income for TY 2026-27: Set up a separate spreadsheet for the current year (April 1, 2026, to March 31, 2027) using the new "Tax Year" concept.
• • Recalculate Current Advance Tax: If you are a freelancer or have business income, calculate your quarterly advance tax installments using the new slab rates of the Income-tax Act, 2025.
• • Preserve Carry-Forward Records: Print a copy of your carry-forward loss statements from your AY 2025-26 and AY 2026-27 returns to ensure they carry forward into the new Act's registry.

Conclusion: Embellishing Your Financial Literacy

The migration from the 1961 Act to the 2025 Act is a major legislative milestone for India. It marks a transition toward a direct tax system that is designed for the digital age, reducing litigation, and making compliance easier for the next generation of wealth creators.

However, during this transition phase, the burden of accuracy lies on you, the taxpayer.

By applying the D.U.A.L. Law Framework, you can anchor your filing in the correct date, apply the appropriate section mappings, avoid confusing your Assessment Years with Tax Years, and ensure that legacy litigation runs its course safely under the old law.

Do not let tax season overwhelm you. Take control of your timelines, file your AY 2026-27 returns under the time-tested 1961 Act, and structure your ongoing earnings under the simplified 2025 Act to step into the future of direct tax with absolute confidence. That is true financial empowerment.