Income Tax Calculator - Old vs New Regime | FinanceMetricX

How Income Tax Works in India

India follows a progressive tax system where income is taxed at increasing rates as it rises through defined slabs. Taxpayers can choose between the old regime (with deductions) and the new regime (lower rates, fewer deductions). The tax calculation involves computing gross income, applying eligible deductions, and then applying the slab rates to the taxable income.

Old Regime vs New Regime

The old regime offers numerous deductions (80C, 80D, HRA, LTA, etc.) but has higher base tax rates. The new regime introduced in Budget 2020 (revised in 2023 and 2024) offers lower tax rates and a higher standard deduction but eliminates most deductions and exemptions. Choosing the right regime depends on your deduction profile.

Tax Calculation Steps

1. Start with Gross Total Income (salary + other income sources)
2. Deduct standard deduction (₹75,000 new regime, ₹50,000 old regime for FY 2025-26)
3. Apply eligible deductions (old regime: 80C, 80D, HRA, etc.)
4. Calculate tax on the resulting taxable income using progressive slabs
5. Apply Section 87A rebate if eligible (income up to ₹12L in new regime)
6. Add surcharge if income exceeds ₹50 lakh
7. Add 4% Health & Education Cess on total tax + surcharge

Key Deductions Under Old Regime

• Section 80C (max ₹1.5L) — PPF, ELSS, EPF, life insurance, home loan principal, children's tuition
• Section 80D (max ₹1L) — Health insurance premiums for self, family, and parents
• Section 80CCD(1B) (max ₹50K) — Additional NPS contribution beyond 80C limit
• HRA Exemption — Varies based on rent paid, salary, and city of residence
• Home Loan Interest (max ₹2L) — Interest on self-occupied property loan under Section 24

Tips for Tax Planning

• Compare both regimes using this calculator before the financial year starts to plan investments accordingly.
• If your total deductions exceed ₹3-4 lakh, the old regime is likely more beneficial.
• Maximize 80C through a mix of EPF, PPF, and ELSS for tax savings with wealth creation.
• Don't forget to claim NPS deduction (80CCD) — it's available above and beyond the 80C limit.
• Standard deduction is automatically available in both regimes without any investment.