Income Tax Calculator India — Old vs New Tax Regime FY 2025-26
The Income Tax Calculator for India (FY 2025-26) helps salaried employees, business owners, and professionals calculate their exact annual tax liability. With India's dual tax regime — Old Tax Regime (with deductions) and New Tax Regime (lower rates without most deductions) — choosing the right regime is critical to minimising your tax burden. This calculator factors in your gross income, standard deduction, Section 80C investments, HRA exemption, NPS contribution, and other deductions to show your tax payable under both regimes.
What is Income Tax Calculator India — Old vs New Tax Regime FY 2025-26?
Income tax in India is a direct tax levied by the Central Government on the annual income earned by individuals, HUFs, companies, and other entities. The Income Tax Act, 1961, governs taxation in India. For individuals, tax is calculated on Net Taxable Income (Gross Income minus all eligible deductions). India introduced the New Tax Regime in FY 2020-21 as an alternative to the Old Regime. From FY 2023-24, the New Regime became the default. The tax is administered by the Income Tax Department under the Ministry of Finance.
Formula Used
Income tax is calculated by applying the applicable tax slab rates to the net taxable income. The final tax includes the base tax, surcharge (if applicable), and 4% Health & Education Cess.
Net Taxable Income = Gross Income − Standard Deduction − Deductions (80C, HRA, NPS, etc.)
Income Tax = Applicable Slab Rate on Net Taxable Income
Final Tax = Income Tax + Surcharge (if applicable) + 4% Health & Education CessHow to Use This Calculator — Step by Step
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Enter your Annual Gross Salary or Income (total income before deductions).
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Enter your deductions: Standard Deduction (₹75,000 for FY 2025-26), Section 80C (up to ₹1.5L), HRA exemption, NPS (Section 80CCD), and other eligible deductions.
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Select your preferred Tax Regime — Old (with deductions) or New (lower rates, fewer deductions).
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The calculator shows Total Tax Liability, Surcharge, Cess, and Effective Tax Rate under both regimes.
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Compare both regimes to choose the one that minimises your actual tax payment.
Real-Life Example
Amit is a software engineer in Hyderabad with gross salary of ₹18 lakh/year. He has: Standard Deduction ₹75,000, Section 80C (EPF + LIC) ₹1,50,000, NPS 80CCD(1B) ₹50,000, HRA exemption ₹1,20,000. Under Old Regime: Taxable Income = ₹18L − ₹75K − ₹1.5L − ₹50K − ₹1.2L = ₹14.05L. Tax ≈ ₹2,07,000 + 4% Cess = ₹2,15,280. Under New Regime: Taxable Income = ₹18L − ₹75K = ₹17.25L. Tax ≈ ₹2,18,750 + 4% Cess = ₹2,27,500. Old Regime saves ₹12,220/year in this case.
Key Benefits
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Know your exact tax liability before filing ITR.
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Compare Old vs New Regime to legally minimise tax.
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Plan Section 80C investments (ELSS, PPF, EPF, LIC) to maximise deductions.
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Understand surcharge applicability for income above ₹50 lakh.
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Calculate effective tax rate and tax as % of income.
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Plan advance tax payments to avoid interest under Section 234B/234C.
Common Mistakes to Avoid
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Not accounting for Standard Deduction of ₹75,000 (FY 2025-26 New Regime; ₹50,000 Old Regime).
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Missing Section 80CCD(2) — employer NPS contribution up to 14% of basic is fully deductible even in New Regime.
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Forgetting that HRA exemption is only available in Old Regime — not in New Regime.
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Not considering Rebate under Section 87A — income up to ₹7 lakh has zero tax under New Regime.
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Ignoring surcharge on income above ₹50 lakh (10%), ₹1 crore (15%), ₹2 crore (25%).
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Assuming all deductions work in New Regime — most deductions (80C, HRA, LTA) are NOT available in New Regime.
Who Should Use This Calculator?
Frequently Asked Questions
Related Calculators
Official References & Sources
Conclusion
The Income Tax Calculator on Inneroot CalcSpace helps you navigate India's complex tax system with clarity. By comparing Old and New Tax Regime side-by-side, you can make an informed decision that minimises your annual tax outgo. Always consult a qualified Chartered Accountant (CA) for personalised tax advice, and file your ITR on the official Income Tax Department portal before the July 31 deadline.