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Sub-section (1) of Section 65 of the Central Goods and Services Tax Act empowers the Commissioner, or any officer authorised by him through a general or specific order, to undertake audit of any registered person for such period, frequency and manner as may be prescribed. Sub-section (2) provides that the audit may be conducted either at the place of business of the registered person or at the office of the proper officer. It is to be noted that this provision is the substantive source of departmental audit jurisdiction and is read with Rule 101 for procedural mechanics.

Sub-section (1) of Section 66 provides that if at any stage of scrutiny, inquiry, investigation or any other proceedings, the officer not below the rank of Assistant Commissioner, having regard to the nature and complexity of the case and the interest of revenue, is of the opinion that the value has not been correctly declared or the credit availed is not within the normal limits, he may, with prior approval of the Commissioner, direct the registered person to get the records including books of account examined and audited by a chartered accountant or a cost accountant nominated by the Commissioner.

Sub-rule (1) of Rule 101 provides that the period of audit shall be a financial year or part thereof or multiples thereof. Sub-rule (2) prescribes Form GST ADT-01 for the audit notice. Sub-rule (4) directs the proper officer, on conclusion of audit, to record the audit observations in his audit notes and to inform the registered person of the discrepancies, who may file his reply. Sub-rule (5) prescribes Form GST ADT-02 for communication of audit findings.

Sub-section (4) of Section 65 prescribes that the audit shall be completed within three months from the date of commencement of the audit. The proviso permits the Commissioner, where satisfied that the audit cannot be completed within three months for reasons to be recorded in writing, to extend the period by a further period not exceeding six months. The expression date of commencement is defined in the Explanation to mean the date on which the records and other documents called for by the tax authorities are made available by the registered person, or the actual institution of audit at the place of business, whichever is later.

Sub-section (6) of Section 65 requires the proper officer, on conclusion of audit, to inform the registered person within thirty days of the findings, the registered person's rights and obligations, and the reasons for such findings. The communication is issued in Form GST ADT-02. It is to be noted that the thirty-day window is mandatory and starts on the date of conclusion of audit, not the date of the audit report.

Section 36 directs every registered person required to keep and maintain books of account or other records under sub-section (1) of Section 35 to retain them until the expiry of seventy-two months from the due date of furnishing the annual return for the year pertaining to such accounts and records. It is to be noted that where the records pertain to a matter that is the subject of an appeal, revision or any other proceeding, retention is required until one year after final disposal.

What is a GST audit and where does it sit in the compliance architecture

Self-certification under GSTR-9C and its audit interplay

Until Finance Act 2021 amendments, Section 35(5) had required certification of GSTR-9C by a Chartered Accountant or Cost Accountant for registered persons whose aggregate turnover exceeded the prescribed threshold. The Finance Act 2021 substituted Section 35(5) and amended Section 44, shifting GSTR-9C to a self-certified reconciliation statement filed by the registered person without third-party attestation, effective FY 2020-21 onwards (Notification 29/2021-CT). The reconciliation in GSTR-9C between audited financial statements and GSTR-9 annual return is now an internal-control disclosure; it does not substitute for departmental audit under Section 65. Audit teams treat GSTR-9C self-certified reconciliations as primary working papers — Table 5 (turnover reconciliation), Table 9 (tax payable reconciliation) and Table 12-14 (ITC reconciliation) become the starting points of Section 65 audit interrogation.

Comparative framework — VAT/CST audits versus GST audit

Pre-GST, the VAT regime in Tamil Nadu (Tamil Nadu VAT Act 2006) had an audit framework under Section 64 with mandatory CA audit certificates for dealers above prescribed turnover, and the Central Sales Tax framework had limited audit coverage focused on inter-State transactions. The GST framework consolidates and rationalises this — a single audit under Section 65 covers central, State and integrated tax dimensions; the cooperative-federal architecture under Article 246A and 279A means the audit can be conducted by either the central or State authority but not both (Section 6 cross-empowerment). The OECD International VAT/GST Guidelines emphasise audit-efficiency through risk-based selection and digital data analytics, both of which the Indian framework has incorporated through GSTN-driven analytics and the GSTR-9C self-certification feed.

Statutory framework under Chapter XIII of the CGST Act

The audit framework under the Central Goods and Services Tax Act 2017 is contained in Chapter XIII, comprising Sections 65, 66 and 71. Section 65 provides for departmental audit, Section 66 for special audit by a Chartered Accountant or Cost Accountant nominated by the Commissioner, and Section 71 for access to business premises by an authorised officer. The Empowered Committee 2009 First Discussion Paper had envisaged audit as the principal verification layer in a self-assessment regime, replacing the pre-GST pattern of routine assessment under the VAT/CST framework. The architecture is risk-based: not every registered person is audited; selection is driven by Section 65(2) read with internal CBIC risk-management directions which factor in turnover scale, sectoral risk profile, prior compliance history and reconciliation gaps surfaced in GSTR-9C self-certification. The audit-process closure under Section 65(7) feeds either into a no-objection certificate, a voluntary DRC-03 payment, or an SCN under Section 73 or Section 74 depending on whether tax has been short-paid, short-collected or wrongly availed as ITC.

GSTR-9C self-certification interplay with audit

GSTR-9C as audit working paper

From the Section 65 audit-team perspective, GSTR-9C is the primary working paper that drives initial audit-topic selection. Table 5 turnover reconciliation surfaces unbilled-revenue, advance-receipt and inter-State stock-transfer issues. Table 7 taxable-value reconciliation surfaces classification and exemption-claim issues. Table 9 tax-payable reconciliation triggers rate-of-tax interrogation. Tables 12 to 14 ITC reconciliation drive Section 16 eligibility and Rule 42 / 43 apportionment audits. The audit team treats unexplained variances in any of these tables as priority interrogation topics; the registered person's strongest defence is a contemporaneous explanatory note attached to GSTR-9C addressing each material variance. CBDT Circular 8/2021 (in the AIS context, on reconciliation principles) and CBIC Circular 124/43/2019-GST on GSTR-9C format offer guidance.

Self-certification risk and director / signatory liability

The shift to self-certification has not reduced substantive accuracy expectations — Section 47(2) penalty for late filing applies, Section 35(5) (as amended) read with Section 122 attracts penalty for incorrect particulars, and Section 137 imposes personal liability on directors, partners and managers for company offences subject to the proviso on diligence. The signatory's diligence in reviewing the underlying GSTR-9 and GSTR-9C contents is now a personal-liability risk, where previously the CA / CMA certifier's professional liability provided an intermediating layer. The OECD International VAT/GST Guidelines' principle of taxpayer self-assessment with audit verification is well-served by the self-certification design, but it shifts more responsibility onto the registered person's internal-control architecture.

Optional GSTR-9C and tactical considerations

For registered persons whose aggregate turnover is between ₹2 crore and ₹5 crore (where GSTR-9 is optional under Notification 47/2019-CT and similar; GSTR-9C threshold is above ₹5 crore), the strategic question is whether to file GSTR-9 and GSTR-9C voluntarily. Voluntary filing provides a contemporaneous reconciliation record that strengthens the audit-defence position; non-filing leaves the audit team to compute reconciliation themselves from primary records, often less favourably. The GST Council 47th Chandigarh and 53rd meetings have periodically rationalised these thresholds; the Empowered Committee 2009 First Discussion Paper had envisaged annual-return-as-integrating-layer architecture that the current threshold-based structure has partially diluted.

Section 67 inspection and its relation to audit

Section 67 framework and reason-to-believe trigger

Section 67 of the CGST Act empowers the proper officer not below the rank of Joint Commissioner, upon reasons to believe recorded in writing, to inspect any place of business of a taxable person or any other person engaged in the business of transporting goods or owner or operator of a warehouse or godown, and to search and seize goods, documents, books and things. The Section 67 power is enforcement-oriented, triggered by suspicion of tax evasion (suppression of supply, claim of ITC in excess of entitlement, contravention of Act or rules), and is distinct from the verification-oriented Section 65 audit. The audit-to-inspection escalation occurs where Section 65 audit finds material gravity that the proper officer reads as warranting enforcement action under Section 67.

Audit-to-inspection escalation patterns

In practice, Section 65 audit findings escalate to Section 67 inspection where the audit team identifies indicators of deliberate evasion — fake invoicing patterns, circular trading rings, ITC claimed against suppliers whose registrations are cancelled or who have nil GSTR-3B filings (Suncraft Energy and downstream judicial line), classification mis-applications that appear deliberate. The escalation is not automatic; the proper officer must form a fresh reason-to-believe under Section 67(1) and record reasons. The Pradeep Goyal (Supreme Court on DIN — Document Identification Number for tax notices) framework requires the inspection authorisation to bear a valid DIN, failing which the action is voidable. The GKN Driveshafts (India) v ITO principle on opportunity-of-being-heard before invasive action is occasionally invoked but its application in the Section 67 context is restricted.

Procedural safeguards under Section 67(2) to 67(10)

Section 67(2) requires that search and seizure shall be carried out in the manner prescribed under Rule 139; provisions of the Code of Criminal Procedure 1973 relating to search and seizure apply mutatis mutandis (Section 67(10)). Section 67(7) provides that goods so seized shall be returned within six months extendable by six months for sufficient reasons. Section 67(8) preserves the registered person's right to make copies of the seized documents. The procedural safeguards exist; the OECD Forum on Tax Administration recommends similar safeguards as part of the taxpayer-rights framework. In practice, the Bharti Airtel v UoI and Suncraft Energy v Asst Commissioner lines of authority have shaped the procedural-fairness review of Section 67 actions in writ jurisdiction before the Madras High Court and other High Courts.

Audit-to-DRC-01 escalation

Appellate framework — Section 107 first appeal and beyond

Where the Section 73 or 74 adjudication order under DRC-07 is adverse, the registered person's first appeal lies under Section 107 of the CGST Act before the Joint or Additional Commissioner (Appeals) within three months from the date of communication of the order, extendable by one month for sufficient cause. Pre-deposit of 10% of the disputed tax amount under Section 107(6) is the gateway requirement. Second appeal lies under Section 112 before the GST Appellate Tribunal (now operational with Principal Bench at New Delhi and State / Area Benches notified); the Section 112 pre-deposit is an additional 20% (cumulative 30%). Beyond the Tribunal, appeal lies to the High Court under Section 117 on questions of law, and to the Supreme Court under Section 118. Writ remedy under Article 226 of the Constitution before the Madras High Court is available for jurisdictional infirmities at any stage.

Section 73 versus Section 74 framing post-audit

Where audit findings are not addressed through voluntary DRC-03 payment, the proper officer issues a Show Cause Notice — DRC-01 under Section 73(1) for cases not involving fraud, wilful misstatement or suppression, and under Section 74(1) for cases involving any of those elements. The framing choice has material consequences. Section 73 attracts penalty of 10% of tax or ₹10,000 whichever is higher (Section 73(9)), with no penalty if voluntary payment is made within thirty days of SCN under Section 73(8). Section 74 attracts penalty of 100% of tax (Section 74(9)), with reduced penalty of 25% if voluntary payment is made within thirty days of SCN under Section 74(8) and 50% within thirty days of order. The extended-period limitation of five years (versus three years under Section 73) is the other material difference.

Defending Section 74 fraud framing

Where the audit-team recommends Section 74 framing, the registered person's defence focuses on the four elements — fraud, wilful misstatement, suppression of facts, or contravention with intent to evade tax. The Supreme Court's pre-GST jurisprudence on similar language in Central Excise (Pushpam Pharmaceuticals v CCE) and Service Tax (CCE v Mehta and Co) emphasised that mere non-payment or non-disclosure does not amount to suppression with intent; positive indicators of intent are needed. Bona-fide classification errors, computational mistakes, and reasonable interpretation differences are not suppression. Where the SCN frames the case under Section 74, the response should systematically address each of the four elements and rely on the documentary trail showing bona-fide compliance attempts. Pradeep Goyal (DIN requirement) and Kranti Associates (reasoned order) provide procedural safeguards.

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