How to Calculate Income Tax in India 2025-26 - Complete Guide
Step-by-step guide to calculate income tax in India FY 2025-26. Learn tax slabs, deductions, rebates, and use our free calculator.
Narasimha Makireddi
Tax Expert | CA Advisor | Income Tax Specialist
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Income Tax Calculation Overview
Income Tax is a direct tax on your income (salary, business, investments) in India. Understanding calculation saves thousands through smart deductions and tax planning. Two regimes available: New Regime (lower rates, no deductions) and Old Regime (higher rates, allows deductions). Choose the regime giving lower tax.
New Tax Regime Slabs FY 2025-26
Up to ₹3L: Nil. ₹3-6L: 5%. ₹6-9L: 10%. ₹9-12L: 15%. ₹12-15L: 20%. Above ₹15L: 30%. Standard Deduction: ₹75,000 allowed. Rebate 87A: If taxable income ≤ ₹7L, get full tax relief up to ₹25,000.
Old Tax Regime Slabs FY 2025-26
Up to ₹2.5L: Nil. ₹2.5-5L: 5%. ₹5-10L: 20%. ₹10-20L: 30%. Above ₹20L: 30%. Deductions allowed: Section 80C (₹1.5L), Section 80D (₹75K), HRA, home loan interest (₹2L), Section 80CCD (₹2L). Standard Deduction: ₹75,000.
Step-by-Step Calculation Example
Gross salary ₹12,20,000. Deductions: Standard ₹75K, HRA ₹1,80K, Section 80C ₹1,50K, 80D ₹50K, home loan interest ₹1,50K = ₹5,05,000. Taxable income = ₹7,15,000. Old regime tax = ₹55,500. New regime tax = ₹81,750. Choose Old Regime, save ₹26,250.
Key Deductions to Maximize
Section 80C (₹1.5L): PPF, ELSS, Insurance, FD. Section 80D (₹75K): Health insurance. HRA: 40% basic in metro (Delhi, Mumbai, Bangalore). Home Loan Interest (₹2L): Section 24. Section 80CCD (₹2L): NPS. Claim all applicable deductions to reduce tax by ₹30-50K annually.
Rebate 87A & Tax Planning
Rebate 87A gives full tax relief for income ≤ ₹7L (New regime) or ≤ ₹5L (Old regime). Most effective in New regime for income ₹5-7L. Higher earners save more by choosing Old regime with maximum deductions. File ITR by July 31 for refunds, February 28 to avoid penalties.
Frequently Asked Questions
What is the difference between old and new tax regime?▾
New Regime: Lower tax rates, no deductions allowed (except ₹75K standard). Old Regime: Higher rates, but allows ₹1.5L+ deductions (80C, HRA, home loan interest). Old regime usually saves more tax if income > ₹10L.
How much tax can I save with Section 80C?▾
Section 80C allows ₹1.5L deduction. At 20% tax rate, this saves ₹30,000 annually! Invest in PPF, ELSS, Insurance, or FD to get this benefit in old regime.
Can I claim HRA exemption if I pay rent?▾
Yes! HRA exemption = Minimum of (actual HRA, 40% of basic salary, rent paid - 10% of basic). File Form 12BB with employer to claim. Saves ₹36K-₹72K annually.
Is income tax filed automatically or do I need to file ITR?▾
Tax is NOT automatically filed. You must file ITR (Income Tax Return) by July 31st for refunds or Feb 28th for penalties. Filing takes 30 minutes online using AIS pre-filled data.
What happens if I miss the ITR filing deadline?▾
For refunds: Deadline is 31st July. Missing this = lose refund (money stuck with govt). For taxes paid: File before Feb 28th to avoid 5% penalty. Always file on time!
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