Old Regime Deduction Optimizer Calculator India — FY 2025-26
Find every deduction you can claim under the old tax regime. See exactly how much room remains in each section (80C, 80D, NPS, HRA, 24b). Calculate the precise break-even point where old regime beats new regime at your income. Discover deductions that cost ₹0 extra — EPF, HRA, standard deduction — that may alone tip old regime in your favour. Updated for FY 2025-26 slabs.
How to Use This Calculator
Deduction Optimizer tab
Enter your gross annual income and each deduction category: Section 80C (EPF, PPF, ELSS, LIC etc.), 80CCD(1B) (NPS additional ₹50K), 80D (health insurance), 24(b) (home loan interest), HRA, 80E (education loan), 80G (donations), and 80TTA/80TTB (savings interest). The calculator shows your total deductions, taxable income, tax payable, and critically — the unused room in each deduction category with potential tax saving you are leaving on the table.
Old vs New Break-Even tab
Enter your income and total deductions. The calculator computes tax under both old and new regime FY 2025-26 slabs side-by-side and tells you: (1) which regime wins at your current deduction level, (2) the exact break-even deduction amount needed for old to match new, and (3) how far above or below break-even you are. The formula accounts for different standard deductions (₹50K old vs ₹75K new) and different Section 87A rebate thresholds.
₹0 Investment Deductions tab
Enter only what you already have without investing a single rupee more: EPF (already deducted from salary), HRA exemption (already paying rent), standard deduction (automatic), and savings account interest (already earned). The calculator shows whether these zero-cost deductions alone make old regime beat new regime at your income level. Many salaried employees discover they are already better off in old regime without any additional investment.
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Formula — Old vs New Regime Tax Calculation
Old Regime Tax (FY 2025-26)
Taxable income = Gross income − Standard deduction (₹50,000) − All Chapter VI-A deductions − HRA exemption − Section 24(b)
Slabs: 0–2.5L nil, 2.5–5L at 5%, 5–10L at 20%, above 10L at 30%. Plus 4% cess.
Section 87A rebate: If taxable income ≤ ₹5,00,000, tax = nil.
New Regime Tax (FY 2025-26)
Taxable income = Gross income − Standard deduction (₹75,000)
Slabs: 0–4L nil, 4–8L at 5%, 8–12L at 10%, 12–16L at 15%, 16–20L at 20%, 20–24L at 25%, above 24L at 30%. Plus 4% cess.
Section 87A rebate: If taxable income ≤ ₹12,00,000, rebate up to ₹25,000 (effectively nil tax up to ~₹12L).
Break-Even Formula
Old regime wins when: Old regime tax (with all deductions) < New regime tax (with only ₹75K standard deduction)
The break-even deduction amount is the total deductions (excluding standard deduction) at which old regime tax exactly equals new regime tax.
Key Deduction Limits (Old Regime Only)
80C: ₹1,50,000 (EPF, PPF, ELSS, LIC, SSY, NSC, tax-saver FD, tuition, home loan principal)
80CCD(1B): ₹50,000 additional for NPS (over 80C limit)
80D: ₹25,000 self (₹50K if 60+) + ₹25,000 parents (₹50K if 60+) = max ₹1,00,000
24(b): ₹2,00,000 home loan interest (self-occupied)
80E: Education loan interest — no cap, available for 8 years
80G: Donations — 50% or 100% deduction
80GG: Rent without HRA — max ₹5,000/month (₹60,000/year)
80TTA: Savings interest — ₹10,000 | 80TTB: ₹50,000 (seniors)
Example — Priya, ₹15L Salary, Old Regime Optimization
Priya — IT professional, ₹15,00,000 CTC, salaried, age 32
Priya earns ₹15L CTC. Basic salary 40% = ₹6L. She lives in Mumbai (metro), pays ₹20,000/month rent, receives ₹6,000/month HRA. She has EPF, PPF, health insurance, and no home loan.
Step 1: List All Deductions
Step 2: Old Regime Tax
Step 3: New Regime Tax
Step 4: Verdict
Key insight: At ₹15L, Priya needs slightly more deductions for old regime to win. If she adds a home loan (Section 24(b) ₹2L interest), her total deductions would rise to ₹5.82L, making old regime significantly cheaper. Alternatively, if parents are senior citizens (80D ₹50K instead of ₹25K), that adds ₹25K more deduction.