Income tax rate for firms remains at 30%, with alternate minimum tax, surcharge, and cess varying across assessment years. Income tax for firms is prescribed at a uniform rate of 30% on total income for the stated assessment and tax years. For the later years covered, the regime also provides for Alternate Minimum Tax at 18.50% of book profit or adjusted total income, with a reduced 9% rate for a non-corporate assessee located in an International Financial Services Centre and deriving income in convertible foreign exchange. The schedule also notes surcharge, marginal relief, and cess requirements that vary across the periods covered.