Income Tax Calculator for Resident Individuals: A.Y. 2025-26 Guide

A.Y. 2025–26 Tax Filing? This Calculator Could Save You Money—Here’s How

If you’re a salaried individual or pensioner under 60 with taxable income below ₹50 lakh, it’s tax season again—and choosing between the old and new regimes can feel like picking between two confusing doors. But a simple Excel tool, updated for Assessment Year 2025–26, makes that decision easier by showing you the numbers upfront. No guesswork, no jargon.

What This Tool Does (and Why It’s Useful)

Designed with straightforward slab logic, this calculator compares your estimated tax liability under both tax regimes. Built by CA Mayur J Sondagar, the Excel-based sheet automatically applies deductions, marginal relief, and slab-wise rates so you can see, in real-time, which option leaves more in your pocket.

Key Features at a Glance

Slab-by-Slab Accuracy: Tax is calculated exactly as per the FY 2024–25 rates—no hidden math.
Standard Deduction Auto-Applied:
- ₹50,000 under the old regime
- ₹75,000 under the new regime (yes, it increased!)
Marginal Relief Ready: If your income slightly exceeds the rebate limit under the new regime, the calculator softens the blow.
Benefit Comparison: Whichever regime gives you a better deal—old or new—it highlights that for you.
User-Friendly Interface: Only the black-shaded cells need your attention. The rest is done for you.

How to Use It (Without Making a Mess)

Download the Excel File Get the calculator sheet (look for direct download links).
Enter Your Details Just focus on the black-highlighted input boxes:
- Gross salary
- Other income (interest, etc.)
- Any deductions under 80C, 80D, etc. (for old regime)
See the Results The tool shows you:
- Tax payable under the old regime
- Tax payable under the new regime
- Which one saves you more—clearly marked
Use It for Tax Planning Whether you’re filing your ITR or estimating advance tax, this tool gives you a clean baseline.

Side-by-Side: Old vs New Regime

Feature	Old Regime	New Regime (Default)
Standard Deduction	₹50,000	₹75,000
Section 80C/80D	Allowed	Not Allowed (few exceptions like NPS)
Rebate (87A)	Up to ₹5 lakh	Up to ₹7 lakh
Slab Simplicity	Moderate	High
Marginal Relief	Limited	Applied for income just above rebate

Income Tax Slabs (FY 2024–25)

Old Regime

Up to ₹2.5 lakh – Nil
₹2.5L to ₹5L – 5%
₹5L to ₹10L – 20%
Above ₹10L – 30%

New Regime

Up to ₹3 lakh – Nil
₹3L to ₹6L – 5%
₹6L to ₹9L – 10%
₹9L to ₹12L – 15%
₹12L to ₹15L – 20%
Above ₹15L – 30%

Don’t forget: The new regime’s higher standard deduction and full 87A rebate mean no tax up to ₹7 lakh in many cases.

A Few Smart Tips Before You Begin

Stick to real numbers—don’t estimate or round off your income.
Use this before filing your ITR—you might be surprised which regime works out better.
For complex income types (like capital gains), consult a CA. This tool is best suited for salaried individuals and basic cases.

Final Word

With the government nudging taxpayers toward the new regime, this calculator helps you make that switch only if it’s financially worth it. For many, especially with fewer deductions, the new regime (with its higher standard deduction) might now be the more efficient choice. But for others who max out 80C, pay premiums, and claim HRA, the old regime might still deliver better savings.