Income-tax rates set by class with corresponding surcharge and withholding rules for computation and collection. The First Schedule prescribes statutory income-tax rates, applicable surcharges and tax-deduction-at-source percentages across taxpayer classes (individuals, HUFs, firms, co-operatives, local authorities and companies), provides separate rates for special computation contexts including salaries and advance tax, and establishes rules for computing net agricultural income-classifying agricultural receipts, applying relevant Income-tax Act heads and sections, detailing set-off and carry-forward of agricultural losses, partner/member share treatment, specified exclusions, and assessment procedures.