Compare your income tax under the new and old regimes for tax year 2026-27 and see which costs less.
Taxable income = gross − standard deduction − eligible deductions. Tax = slab tax − rebate (with marginal relief just above ₹12 lakh in the new regime) + surcharge (with marginal relief) + 4% cess.
₹12,00,000 of income pays nil tax under the new regime; at ₹12,10,000, marginal relief caps tax at ₹10,000 plus cess.