Reconciliation of Financial Statements and GST Returns: map revenue and ITC to returns to detect undeclared supplies and erroneous credit claims.

Auditors must reconcile financial statements and trial balances with GST returns by mapping every revenue and deemed supply item to outward supplies declared in GSTR 3B, classifying incidental receipts in "Other Income", and ensuring aggregate outward supplies (adjusted for deemed supplies and no supplies) match returns; ITC items in Table 4 must be disaggregated and traced to purchase and ledger records, with special scrutiny of ISD credits, reverse charge receipts, inter unit cross charges and blocked credits, and all reconciliations documented in working papers.

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