GSTR-3 monthly return: auto-populated Part A and Part B for tax payment, ITC, adjustments and refund conditions. Form GSTR-3 is the monthly return divided into auto-populated Part A (turnover, outward/inward supplies, rate-wise tax, reverse-charge and amendments) and Part B (payment of tax, interest and fees via electronic credit and cash ledgers). It requires detailed rate-wise tax computation, ITC accounting for inputs, input services and capital goods, adjustments for mismatches and past-period changes, and records TDS/TCS credits, interest, late fees and debit entries; GSTR-3 generation requires prior filing of GSTR-1 and GSTR-2 and refunds from the cash ledger are allowed only after all period liabilities are discharged.