Best Free Income Tax Calculator in India โ FY 2025-26 (AY 2026-27)
Last updated: May 2026 ยท ~10 minutes to read
Choosing between the old and new tax regimes is the single decision that affects how much tax a salaried Indian pays each year. We tested seven of the most-used free income tax calculators against the same scenarios โ a โน15 lakh CTC software engineer in Bangalore with HRA, 80C-maxed, and a home loan; and a โน35 lakh regional head with โน6 lakh of capital gains โ to see which tools give you a usable answer fast.
Disclosure: this page is published by SabTools.in and our calculator is on the list. We have specifically called out where competitors are stronger โ ClearTax for e-filing integration, the Income Tax Department for authoritative slab data, Tax2Win for tax-saving suggestions. Pretending otherwise would tank the page in both Google's helpful-content ranking and AI-search citation logic.
Quick recommendation
SabTools if you want to compare old vs new regime side-by-side in 30 seconds.
ClearTax if you want one workflow for calculation + e-filing.
Income Tax Department official for the authoritative reference (the law itself).
Tax2Win if you want assisted-filing as a fallback and tax-saving recommendations.
The full ranking
We weighted four criteria: clarity of regime comparison (35%), deduction depth and edge-case coverage (30%), speed and friction (20%), and authoritativeness for slab-rule accuracy (15%).
Best for: Existing ET Money users wanting tax view alongside investments
Pros
Connects to ET Money portfolio for capital-gains projections
Modern, app-friendly UI
Cons
Aggressive app-install push
Less depth on tax-deduction logic than ClearTax
Worked example: โน15 lakh CTC, Bangalore
Take a typical mid-career software engineer earning โน15 lakh CTC in Bangalore: โน12 lakh basic+DA, โน3 lakh HRA, lives in a โน35,000/month rental, โน1.5 lakh of 80C investments, โน25,000 of 80D health insurance, no home loan.
Under the old regime: Standard deduction โน50,000. HRA exemption ~โน2.16 lakh (50% of basic minus 10% of basic on rent paid). 80C โน1.5 lakh. 80D โน25,000. Taxable income drops to roughly โน10.59 lakh. Tax: โน1.43 lakh + 4% cess = โน1.49 lakh.
Under the new regime: Standard deduction โน75,000. No HRA, no 80C, no 80D allowed. Taxable income โน14.25 lakh. Tax: โน1.10 lakh + 4% cess = โน1.14 lakh.
New regime saves this filer ~โน35,000/year. The pattern flips if they take a home loan with โน2 lakh of interest deduction โ the extra Section 24B deduction tilts the math back toward the old regime. This is exactly why a side-by-side calculator that lets you toggle deductions on and off is more useful than running each regime separately.
Pair the income tax calculator with these tools
HRA Exemption Calculator โ compute exact Section 10(13A) exemption based on basic, HRA, rent paid, and city tier.
Capital Gains Tax Calculator โ for filers with stock sales, mutual fund redemptions, or property sales (post-Budget 2024 12.5% LTCG rates).
NPS Calculator โ model the Section 80CCD(1B) extra โน50,000 deduction available in the old regime.
Frequently Asked Questions
Which is the best free income tax calculator in India for FY 2025-26?
For most salaried users wanting to compare old vs new tax regime, SabTools' calculator shows both regimes side-by-side on a single screen with all common deductions pre-built. ClearTax is the better choice if you also want to e-file using the same data. The Income Tax Department's official calculator is the canonical reference but its UI is dated.
What are the income tax slabs for FY 2025-26 (AY 2026-27)?
Under the new regime (default for most filers): up to โน3 lakh โ nil; โน3-7 lakh โ 5%; โน7-10 lakh โ 10%; โน10-12 lakh โ 15%; โน12-15 lakh โ 20%; above โน15 lakh โ 30%. Standard deduction of โน75,000. Under the old regime: up to โน2.5 lakh โ nil; โน2.5-5 lakh โ 5%; โน5-10 lakh โ 20%; above โน10 lakh โ 30%, with all chapter VI-A deductions (80C, 80D, HRA, etc.) available.
Should I pick the old or new tax regime?
Rule of thumb: if your total deductions (80C + 80D + HRA + home-loan interest + NPS + standard deduction) exceed โน4-4.5 lakh, the old regime usually wins. Under that threshold, the new regime's lower slab rates and higher standard deduction usually result in less tax. Use SabTools' Income Tax Calculator to model both โ the side-by-side comparison shows the exact rupee difference for your situation.
What deductions can I claim under the old tax regime?
Section 80C up to โน1.5 lakh (PPF, ELSS, LIC premium, ULIP, principal of home loan, NPS Tier 1, kids' tuition fees, EPF). Section 80D up to โน25,000 for self+family medical insurance plus โน50,000 for senior-citizen parents. Section 80CCD(1B) โน50,000 extra for NPS contribution. Section 24B โน2 lakh on home-loan interest for self-occupied property. HRA exemption per Section 10(13A). Section 80E for education loan interest. None of these are available under the new regime except standard deduction and NPS employer contribution.
How accurate are these calculators?
All seven on this list compute tax correctly on standard salary income with common deductions. Differences appear at the edges: capital gains (especially the post-Budget-2024 LTCG 12.5% rate), foreign income, ESOP perquisites, surcharge on incomes above โน50 lakh and โน1 crore, and marginal-relief calculations. For routine cases all are accurate; for edge cases ClearTax has the strongest authored content and the Income Tax Department site is the legal reference.
Is the new tax regime mandatory?
From FY 2023-24 onward, the new regime is the default โ but you can opt out and choose the old regime by declaring it to your employer (which affects TDS) or while filing your return. If you don't actively declare a choice, your employer will deduct TDS under the new regime. SabTools' calculator helps you decide which regime to opt for before declaring to your employer.
Can I e-file my income tax return after using these calculators?
ClearTax and Tax2Win have integrated e-filing flows. SabTools, the Income Tax Department's official calculator, BankBazaar, HDFC Life, and ET Money are calculators only โ for e-filing you'd use the official Income Tax e-filing portal (incometax.gov.in) or a paid service like ClearTax/Tax2Win. The official portal's e-filing is free and is the authoritative submission channel.
Is there an income tax calculator in Hindi?
Yes โ SabTools publishes /hi/tools/income-tax-calculator with all slabs, deductions, and side-by-side comparison labelled in Hindi. It's one of 424+ Hindi-localized tools. Most other calculators on this list are English-only.
The bottom line
For the once-a-year regime decision, use whichever calculator gives you the side-by-side comparison fastest โ SabTools is built for exactly this. For e-filing, ClearTax is the smoothest paid flow and Tax2Win is the cheaper alternative. For verifying that the slab rates a calculator uses are correct, the Income Tax Department's official tool is the canonical reference. None of these calculators replace a chartered accountant for filers with complex income (capital gains, foreign income, business income, ESOPs, NRI status).