GST audit questionnaire requires detailed disclosures on supplies, invoicing, accounting systems, and reverse charge reporting. A structured questionnaire annexed to the GST Audit Manual requiring auditees to provide identifying details, GSTIN designations, tax-paid totals by ledger and tax head, and detailed disclosures of related-party and non-consideration supplies with tax breakdowns. It requires reporting of supplies with HSN/SAC, inward supplies under the Reverse Charge Mechanism, offences, adjustments affecting P&L and turnover, advance receipts, refunds, and reimbursements. The instrument also compels detailed invoicing and accounting compliance information including invoice series and generation, account heads for taxable and exempt supplies, electronic accounting software, basis of accounting, changes in accounting policies or software, and auditor details.