GST Monthly Return structure: auto-populated ledgers and tables enabling tax computation, ITC claims, refunds, and dual filing modes. The GSTR-3 monthly return captures taxpayer and period details, turnover breakdowns, aggregated outward and inward supplies auto-populated from other returns, separate tables for tax computation, TDS credits, liabilities under CGST/SGST/IGST and other charges, and running electronic ledgers (ITC, cash, liability) that update in real time. The return supports online and offline filing, permits earlier debit entries in offline mode with later verification, allows taxpayers to claim or carry forward ITC balances, and provides fields for refund selection and bank account designation.