GST departmental proceedings begin with a discrepancy in returns, an intelligence input, or a scheduled audit. The taxpayer is expected to produce the same figures that were filed, supported by invoices, e-way bills, contracts, and ledgers. Preparation is therefore a reconstruction of the return trail for the period under review.
The file for a scrutiny notice, ASMT-10 observation, or audit memo lists each issue raised, the table of the return it refers to, the book figure, and the document that explains the difference. Common themes are turnover mismatch with e-way bills or income-tax records, ITC claimed against ineligible documents, reverse-charge shortfall, and classification or place-of-supply disputes.
Replies are drafted to the form and timeline of the notice. Where tax, interest, or penalty is proposed, the computation is checked against the Act and the facts. If the matter proceeds to adjudication or appeal, the same paper-book is expanded rather than rebuilt.
Internal GST audit, where commissioned by the entity itself, uses the same tests so that issues are found and corrected before a departmental team asks for the same papers.