Four rates: 25/30%, 22%, 15% and 35%
Indian corporate tax is not a ladder of rising bands. A single rate applies according to the type of company and the regime it is in; once taxable income passes ₹1 crore, surcharge is added on the whole tax; and finally a 4% Health and Education Cess is charged on tax plus surcharge.
A domestic company's normal rate turns on turnover two years earlier. For FY 2025-26 the base year is PY 2023-24 and for tax year 2026-27 it is tax year 2024-25: turnover of up to ₹400 crore means 25%, anything above means 30%. Surcharge is 7% once taxable income exceeds ₹1 crore and 12% above ₹10 crore. In effective terms a 25% company pays 26%, 27.82% or 29.12%, and a 30% company 31.2%, 33.384% or 34.944%.
There are two concessional regimes. One gives up deductions and incentives in exchange for a flat 22% (s.200, formerly s.115BAA); the other is a 15% rate for new manufacturing companies set up after September 2019 (s.201, formerly s.115BAB). Both carry a flat 10% surcharge whatever the income, so 22% works out at 25.168% and 15% at 17.16%. A foreign company taxed through an Indian branch or PE pays 35% plus 2% or 5% surcharge, 36.4% to 38.22% in all.
A further 25% option exists for manufacturers set up after February 2016 (s.199, formerly s.115BA). It only matters to manufacturers with turnover above ₹400 crore, so this calculator does not cover it.