Income-tax rates, surcharge, tax deduction at source and agricultural income computation are structured across multiple taxpayer categories. The First Schedule prescribes income-tax rates for individuals, women residents, senior citizens, co-operative societies, firms, local authorities and companies, together with surcharge provisions for specified categories. It also lays down tax-deduction-at-source rates for interest, winnings, royalty, technical services, capital gains and other income, with different treatment for residents, non-resident Indians, non-residents and companies. The Schedule further provides rules for charging tax, deducting salary tax and computing advance tax, and contains detailed rules for computing net agricultural income, including special treatment of tea, rubber and coffee income, loss set-off limits and procedural assessment powers.