India's dual tax regime system since FY 2020-21 means every taxpayer must choose: the old regime with its rich deductions or the new regime with lower slab rates. The old and new tax regime calculator does this comparison instantly — you enter your income and deductions, and it shows your exact tax under both regimes.
Old Regime vs New Regime: The Core Difference
| Feature | Old Regime | New Regime |
|---|---|---|
| Slabs | Higher rates, more brackets | Lower rates, fewer brackets |
| Standard Deduction | ₹50,000 | ₹75,000 |
| Section 80C | Up to ₹1.5 lakh | Not available |
| HRA Exemption | Available | Not available |
| 80D (Health Insurance) | Up to ₹25,000–₹75,000 | Not available |
| Home Loan Interest (24b) | Up to ₹2 lakh | Not available |
| Default for FY 2025-26 | Must opt in | Default |
Breakeven Analysis: When Does Old Regime Win?
The old regime beats the new regime only when your total eligible deductions are high enough. Here's the approximate breakeven deduction by income level:
| Annual Income | Old Regime Wins If Deductions Exceed |
|---|---|
| ₹8,00,000 | ~₹1,50,000 |
| ₹10,00,000 | ~₹2,00,000 |
| ₹15,00,000 | ~₹2,50,000 |
| ₹20,00,000 | ~₹3,25,000 |
| ₹30,00,000 | ~₹4,00,000 |
If your 80C + HRA + 80D + home loan interest total exceeds these thresholds, the old regime saves more tax.
Step-by-Step: How to Use the Calculator
- Enter your gross annual salary (including allowances)
- Enter HRA received and rent paid (for HRA exemption)
- Enter Section 80C investments (PF, PPF, ELSS, LIC — max ₹1.5 lakh)
- Enter health insurance premium (80D)
- Enter home loan interest paid this year
- Click Calculate — the calculator shows tax under both regimes and tells you which one saves more
Common Mistakes When Choosing Regimes
- Not declaring in time: Salaried employees must tell their employer by April; missing it means TDS is deducted under the default new regime
- Forgetting employer PF contribution in 80C (counts toward the ₹1.5 lakh limit)
- Choosing based on last year's regime — recalculate every year as deductions and slabs change
- Assuming new regime is always better — if you have a housing loan and 80C investments, old regime often wins
Tip: The calculator above uses the due date for FY 2025-26 filing (July 31, 2026 for non-audit cases). Run the comparison before April when your employer asks for investment declarations.