GST Audit Support · Vanagaram-Porur Road commercial corridor with mid density retail Pocket

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 (3) of Section 66 directs the nominee auditor to submit the report to the Assistant Commissioner within ninety days, which may be extended by a further ninety days on application by the registered person or the nominee auditor for material and sufficient reasons. It is to be noted that the ceiling on combined period under this provision is one hundred and eighty days.

Sub-section (3) of Section 65 provides that the registered person shall be informed by way of a notice not less than fifteen working days prior to the conduct of audit. The notice is issued in Form GST ADT-01 as prescribed under Rule 101(2). It is to be noted that the fifteen-working-day window is a substantive procedural safeguard; commencement of audit proceedings without compliance with this timeline is a jurisdictional infirmity that may be agitated under Article 226.

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.

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

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.

Audit versus assessment versus inspection

Audit under Section 65 or 66 is conceptually distinct from assessment under Sections 61 (scrutiny of returns) and 62 (best-judgement assessment of non-filers) and from inspection / search / seizure under Section 67. Scrutiny under Section 61 is a desk-review of returns by the proper officer who issues ASMT-10 on discrepancies; the registered person responds in ASMT-11; closure or escalation follows. Audit is broader — Section 65(5) permits examination of the books, returns, statements, declarations and other documents to verify correctness of turnover declared, taxes paid, refund claimed and ITC availed, plus assessment of compliance with the Act. Inspection under Section 67 is targeted enforcement upon reason-to-believe of tax evasion and is invasive — premises access, seizure of records and goods. The OECD Forum on Tax Administration's compliance-pyramid model recommends graduated escalation from desk review to field audit to inspection, and the Indian framework broadly mirrors that design.

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.

Section 66 special audit by CA / CMA

Comparative framework — special audit in income tax and GST

The income-tax framework has a parallel under Section 142(2A) of the Income Tax Act 1961 — special audit can be directed where the Assessing Officer, having regard to the nature and complexity of the accounts, the volume of accounts, doubts about the correctness of the accounts, multiplicity of transactions in the accounts or specialised nature of business activity, is of the opinion that it is necessary in the interests of revenue. Pre-GST excise had Section 14A; service tax had Section 72A. The architectural unity across these provisions is that special audit is a complexity-triggered intervention requiring a substantive opinion plus a procedural safeguard. The OECD Forum on Tax Administration documents a similar 'specialist audit' tier in several mature tax jurisdictions, reserved for complex high-revenue cases.

Trigger conditions under Section 66(1)

Section 66(1) of the CGST Act provides that if at any stage of scrutiny, inquiry, investigation or any other proceedings, any 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 the prior approval of the Commissioner, direct such registered person by communication in writing to get his records including books of account examined and audited by a Chartered Accountant or a Cost Accountant as may be nominated by the Commissioner. The trigger requires both a substantive opinion (value mis-declaration or abnormal credit) and a procedural pre-condition (Commissioner's prior approval); the registered person can challenge either limb in a Section 75 representation.

Procedural sequence under Section 66(2) to 66(5)

Once the Section 66(1) opinion is formed and Commissioner's approval obtained, Section 66(2) requires the nominated Chartered Accountant or Cost Accountant to submit a report duly signed and certified, in such form as prescribed (Form ADT-04), within ninety days; this period can be extended by a further ninety days on application by the registered person or the CA/CMA, with the Commissioner's permission. Section 66(3) requires that the registered person be given an opportunity of being heard in respect of any material gathered on the basis of the special audit and proposed to be used in any proceeding against him. Section 66(4) clarifies that the expenses of the examination and audit, including remuneration of the CA/CMA, shall be determined and paid by the Commissioner. Section 66(5) preserves the proper officer's power to take further proceedings (SCN under Section 73 / 74) on the basis of the special audit findings.

ADT-01 intimation

Seeking extension of the audit-commencement date

Where genuine grounds exist — pending statutory audit of financial statements, key personnel unavailability, or recent migration of accounting systems — the registered person can seek extension of the audit commencement date by written representation. The audit team has administrative discretion under Rule 101 to grant reasonable extensions, generally up to thirty additional days; longer extensions require Commissioner-level approval. The extension must be sought before the proposed commencement date and supported by documentary evidence (statutory auditor engagement letter, employee leave records, ERP migration plans). The OECD Forum on Tax Administration best-practice benchmarks recognise such extensions as a taxpayer-rights safeguard, balanced against the audit-closure timeline.

Risk-engine selection and audit-pool composition

ADT-01 intimations are not randomly issued; selection is driven by the GSTN risk engine combined with CBIC Audit Manual sectoral profiles. The risk engine factors include sharp variances between GSTR-1 and GSTR-3B, between GSTR-2A and GSTR-3B Table 4(A), between GSTR-9 and audited financial statements (via GSTR-9C), unusually high refund claims, sector-specific red flags (e.g. inverted-duty sectors, real-estate developers under Notification 03/2019-CT(R)), and prior-audit findings. The risk-based architecture aligns with the GST Council 47th and 53rd meeting recommendations on focusing enforcement on high-risk taxpayer cohorts while reducing nuisance audits of compliant small taxpayers. Knowing one's risk-profile drivers helps the registered person anticipate audit topics and prepare working papers accordingly.

Form, contents and statutory basis

Form GST ADT-01 is the audit-initiation intimation prescribed under Rule 101(2) of the CGST Rules 2017. The form is generated by the proper officer (or audit officer authorised by the Commissioner) and served on the registered person at least fifteen working days before the date proposed for commencement of audit. ADT-01 contains the GSTIN and legal name of the registered person, the period proposed to be audited (typically one financial year), the place where audit will be conducted (place of business or office of the proper officer), the date of audit commencement, and a schedule of documents to be made available — books of account, invoices, returns including GSTR-9 and GSTR-9C, declarations, internal-audit reports, agreements material to the tax position, and any other document the audit team specifies. The fifteen-day window is a statutory taxpayer right under Section 65(3) read with Rule 101(2).

ADT-02 audit report

Reading the audit-observations and proper-officer reasoning

ADT-02 audit observations are structured around the verification heads — turnover under Section 9 read with Section 7, taxable value under Section 15, rate of tax under the rate notifications, ITC under Sections 16 to 21, refund under Sections 54 and 55, and miscellaneous compliance. Each observation typically includes the audit team's working, the discrepancy quantum, the section / rule under which the proposed addition is framed, and the proper officer's reasoning. The Kranti Associates v Masood Ahmed Khan (2010) Supreme Court principle on reasoned orders applies — the proper officer's reasoning must engage with the registered person's explanations and cannot be a mechanical reproduction of audit-team working. Where reasoning is absent or perfunctory, the registered person has stronger grounds in subsequent Section 73 / 74 proceedings or in a writ petition before the Madras High Court under Article 226.

Voluntary payment under Section 73(5) post ADT-02

Section 73(5) of the CGST Act allows the registered person to pay the tax along with interest under Section 50 on the basis of own ascertainment or as ascertained by the proper officer and inform the proper officer of such payment in Form DRC-03 before service of an SCN under Section 73(1). Where the registered person agrees with the ADT-02 findings, voluntary payment under Section 73(5) avoids the SCN cycle entirely and limits the financial impact to tax plus interest, without penalty. Section 73(6) then mandates that no SCN shall be issued in respect of the amount paid. This voluntary-payment route is the preferred audit-closure mechanism for genuine ITC errors, classification mis-applications and minor valuation gaps, and is widely used in practice.

Disagreement options post ADT-02

Where the registered person disagrees with one or more ADT-02 findings, the response options are: (a) file a Section 75 representation seeking re-consideration before the SCN stage; (b) await the SCN under Section 73 or 74 and contest at that stage; (c) where the audit findings are perceived as jurisdictionally infirm, file a writ petition before the Madras High Court under Article 226 of the Constitution. The writ remedy is typically reserved for jurisdictional infirmities — absence of Commissioner approval under Section 66, breach of the Section 65(4) timeline, denial of Section 75 opportunity of hearing — rather than for merit-based challenges. The Aap and Co v UoI (Gujarat HC) and Asahi India Glass v UoI (P&H HC) lines of authority offer guidance on writ-jurisdictional questions in audit and assessment matters.

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