Analysis on GST Audit

Analysis on GST Audit

GST audit in India operates on two statutory tracks in FY 2026-27: a departmental audit by an authorised officer under Section 65 of the CGST Act 2017, and a special audit by a nominated CA or CMA under Section 66. Alongside these, every registered person with aggregate turnover above Rs. 5 crore must file a self-certified reconciliation in Form GSTR-9C. Knowing what triggers each track, what the officer examines first, and what your rights and liabilities are at each stage lets you walk into an audit — or prepare before one arrives — with confidence rather than panic.

The Three Pillars of GST Audit in FY 2026-27

Before diving into mechanics, it is worth understanding the structural shift that reshaped GST audit from FY 2021-22 onward. The Finance Act 2021 deleted Section 35(5) and amended Section 44, abolishing the mandatory external audit by a CA or CMA that was once required for taxpayers above Rs. 2 crore. What replaced it was self-certification of GSTR-9C — meaning the taxpayer signs the reconciliation, not an independent auditor. This change reduced compliance cost but intensified the department's own audit activity: with no external auditor filtering discrepancies before they reach the return, officers now find more to examine themselves.

The three pillars operating in 2026 are:

1. Departmental Audit under Section 65 — by a GST officer or team at your principal place of business.
2. Special Audit under Section 66 — ordered by the Commissioner, conducted by a CA or CMA nominated by the Commissioner, at the Commissioner's expense.
3. GSTR-9C Self-Certified Reconciliation under Section 44 read with Rule 80(3) — mandatory for registered persons whose aggregate turnover exceeds Rs. 5 crore in the financial year, signed by the taxpayer or an authorised signatory.

Each pillar is independent. A business can simultaneously be subject to a Section 65 departmental audit for FY 2024-25 and be filing GSTR-9C for FY 2026-27. Understanding which track is live and what it demands is step one.

Section 65: Departmental Audit — From ADT-01 to ADT-02

What Triggers a Section 65 Audit

Section 65(1) confers wide discretionary power: "The Commissioner or any officer authorised by him...may undertake audit of any registered person for such period, at such frequency and in such manner as may be prescribed." In practice, the GSTN's analytics engine flags taxpayers based on risk signals, including:

• Persistent gaps between ITC in GSTR-3B and the auto-populated GSTR-2B
• E-way bill data showing outward movement inconsistent with GSTR-1 taxable supplies
• Declared turnover in GSTR-9 materially lower than income appearing in Form 26AS or AIS on the income-tax portal
• Sector-wide campaigns — pharma distribution, construction sub-contracting, and textile trading are recurrent targets
• Tip-offs or intelligence gathered during scrutiny of related-party GSTINs

Size alone does not determine audit exposure. A Rs. 3 crore pharmaceutical distributor with a 45% ITC rate and minimal outward IGST can attract scrutiny faster than a Rs. 25 crore pure-service exporter with clean LUT documentation and near-zero ITC.

The ADT-01 Notice: Your First 15 Working Days

When an audit is decided, Form GST ADT-01 must be served at least 15 working days before the audit commences (Rule 101(2) of the CGST Rules 2017). The notice specifies the period under audit, the date, time, and venue, and the officer's details.

Treat these 15 working days as a structured preparation sprint, not administrative buffer:

1. Download all GST returns for the period — GSTR-1, GSTR-3B, GSTR-9, and GSTR-9C — from the GST portal and organise by month.
2. Pull GSTR-2B for each month in scope; do not rely on GSTR-2A, as only GSTR-2B anchors the Rule 36(4) ITC restriction.
3. Run a line-by-line reconciliation of GSTR-2B against the purchase register. Annotate every difference: "supplier filed GSTR-1 late — ITC claimed in correct subsequent period" or "vendor is under composition — credit note issued without GST."
4. Compile all RCM self-invoices, payment vouchers, and the Table 3.1(d) entries in GSTR-3B that match them.
5. Cross-check your GST turnover against Form 26AS and the AIS figures on the income-tax portal for the corresponding assessment year.
6. Write a one-page position paper on any grey-area treatment in your business — a discount structure, a cross-charge arrangement, a mixed-supply classification — so the officer sees your reasoning upfront rather than inferring intent from unexplained numbers.

Presenting the officer with an indexed, tab-divided document set on day one keeps the audit narrower. Officers with clear records move through audits faster; officers presented with disorganised ledgers tend to expand scope.

The Audit Timeline and ADT-02

Section 65(4) mandates completion within three months from the date of commencement. The Principal Commissioner or Commissioner may extend this by up to six additional months by recording reasons in writing. Note that commencement is the date the officer first appears at your premises — not the ADT-01 date. Maintain a written acknowledgement of the commencement date, because it anchors the statutory clock.

On completion, the officer issues Form GST ADT-02, setting out observations, discrepancies, your replies, and any tax-and-interest determined. Section 65(6) requires that you be given the opportunity to be heard in respect of discrepancies before ADT-02 is finalised. Use this right in writing — every rebuttal you submit narrows the final demand.

If you admit a discrepancy and pay tax, interest, and applicable penalty before a show-cause notice (SCN) is issued, Section 65(7) deems proceedings concluded. Where discrepancies are contested, the officer initiates proceedings under Section 73 (non-fraud cases) or Section 74 (fraud, wilful misstatement, or suppression).

Section 66: Special Audit — When the Commissioner Steps In

Section 66 is a more targeted instrument. Any officer of Assistant Commissioner rank or above, with the prior written approval of the Commissioner, may direct a special audit if they believe:

• The value of supply declared is incorrect, or
• ITC availed is outside normal limits for the sector or scale of operations, or
• Any other complexity or revenue interest makes a deeper examination necessary

The critical distinction from Section 65: instead of department officers auditing your books, the Commissioner nominates a Chartered Accountant or Cost Accountant from a panel — and that nominated professional examines your accounts. The nominated auditor submits the report within 90 days of the direction, extendable by a further 90 days on sufficient cause. The entire cost — professional fees included — is borne by the Commissioner under Section 66(5), not the taxpayer.

Section 66 audits appear most frequently in real estate (complex project accounting and ITC on construction), EPC contracts (milestone billing vs. percentage-completion debates), and pharmaceutical intermediaries (declared pricing vs. market comparables). If you operate in these sectors and your ITC pool or declared value is an outlier relative to peers, consider a proactive internal review before a Section 66 direction arrives.

GSTR-9C Self-Certified Reconciliation: What Officers Analyse First

Before authorising any departmental audit, officers almost certainly study the GSTR-9C filed for the period. For FY 2026-27, the self-certification obligation applies to every registered person with aggregate turnover above Rs. 5 crore as currently notified. Officers focus on three parts:

• Table 5 (Turnover Reconciliation): Differences between the audited financial statement turnover, the income-tax return figure visible in AIS, and the GST return turnover. A Rs. 15 lakh unexplained gap here is an automatic audit flag. A gap with a typed note — "Rs. 15,42,000 represents sale of investment property exempt under Schedule III of CGST Act" — closes the question before it becomes a question.
• Table 12B (ITC Reconciliation): Maps ITC declared in GSTR-9 to total ITC availed after reversals. Any unexplained shortfall or excess is the first thing the audit team pursues.
• Table 16 (Reasons for Unreconciled Differences): Blank rows here communicate either carelessness or concealment. Neither is helpful.

A GSTR-9C filed with well-documented disclosure notes, cross-referenced to the trial balance and the ITR-6 filing, functions as a first-line defence. One filed with large unexplained differences — particularly in ITC — accelerates the risk-scoring algorithm that generates ADT-01s.

Documents the GST Auditor Will Ask For

Prepare and index the following before commencement:

GST Returns and Supporting Workings

• GSTR-1, GSTR-3B, GSTR-9, GSTR-9C for each financial year under audit
• Month-wise GSTR-2B PDFs downloaded from the GST portal
• ITC-04 (job-work details) if you are a principal or job-worker
• All RFD-01 refund applications with order copies and disbursement details

Books of Accounts

• Purchase register mapped to GSTR-2B, with mismatch explanations annotated
• Sales register mapped to GSTR-1 B2B, B2C, export, and deemed-export entries
• Stock register with opening and closing balances — officers reconcile this with e-way bill data for manufacturers and traders
• Cash and bank summaries — unexplained cash receipts raise the question of unregistered B2C supplies

Transaction-Level Documents

• Tax invoices, debit notes, credit notes (both inward and outward) with HSN/SAC, GSTIN, and correct tax breakup
• IRN-stamped e-invoices and EWB-numbered e-way bills; any serial number gaps must be explained in writing
• For imports: Bill of Entry, ICEGATE-generated assessment orders showing IGST paid at customs
• For LUT-based exports: FIRC or Bank Realisation Certificates confirming foreign-exchange realisation within the permitted timeline

ITC Eligibility Evidence

• Supplier invoices with payment confirmation against each — Section 16(2)(b) requires proof of payment to the supplier within 180 days
• Rule 42/43 reversal workings showing the proportion of exempt supplies to total supplies for each tax period
• Board minutes or director approval where ITC is claimed on capital goods above a threshold
• Written documentation of why any Section 17(5) item has been treated as eligible — if you have a view, record it contemporaneously

Worked Example: Quantifying the Exposure on a Rs. 12 Crore Manufacturer

Setting: A Mumbai-based textile manufacturer (GSTIN 27XXXXX) with FY 2025-26 turnover of Rs. 12,40,00,000. The officer issues ADT-01 in August 2026 covering FY 2025-26.

Issue 1 — Blocked ITC on Motor Vehicle Insurance (Section 17(5))

The audit identifies ITC of Rs. 2,40,000 claimed on comprehensive insurance for three passenger cars used by senior management. Motor vehicle insurance for cars not used in the business of supply of transportation, rent-a-cab, or similar services is a blocked credit under Section 17(5)(b)(ii). The ITC was claimed and fully utilised in GSTR-3B.

• Tax demand: Rs. 2,40,000
• Interest @ 24% p.a. (wrongly availed and utilised ITC, Section 50(3)) for 18 months (approximately July 2025 to January 2027): Rs. 2,40,000 × 24% × 1.5 = Rs. 86,400
• Penalty under Section 73(9) if SCN is issued and paid within 30 days: 10% of Rs. 2,40,000 = Rs. 24,000
• If voluntarily paid before SCN under Section 73(7): penalty is nil
• Pre-SCN total outflow: Rs. 2,40,000 + Rs. 86,400 = Rs. 3,26,400

Issue 2 — RCM on Import of Services Not Declared

The company engaged a UK-based software firm for ERP support at GBP 3,000 per month for 12 months. At an average exchange rate of Rs. 107 per GBP, total consideration = Rs. 38,52,000. GST @ 18% is payable under reverse charge on import of services (Section 5(1) of the IGST Act 2017 read with Entry 1 of Notification 10/2017-IGST) = Rs. 6,93,360. Neither declared nor paid in GSTR-3B for any month of FY 2025-26.

• Tax demand: Rs. 6,93,360
• Interest @ 18% p.a. (delayed payment, Section 50(1)) for 14 months (approximately July 2025 to September 2026): Rs. 6,93,360 × 18% × (14/12) = Rs. 1,45,606
• Penalty under Section 73(9) if SCN issued: 10% of Rs. 6,93,360 = Rs. 69,336
• Pre-SCN total outflow: Rs. 6,93,360 + Rs. 1,45,606 = Rs. 8,38,966

Combined View

The Rs. 93,336 penalty difference is the direct financial cost of contesting issues with limited legal merit. A quick internal pre-audit review — specifically checking Section 17(5) credits and RCM on import of services — followed by voluntary payment before the SCN stage, eliminates that cost and closes the audit faster.

Common Audit Triggers and Pitfalls to Avoid

ITC claimed beyond GSTR-2B without a documented basis: Rule 36(4) restricts ITC to what appears in GSTR-2B. Claiming even Rs. 50,000 of ITC on a genuine invoice where the supplier has not filed GSTR-1 is one of the easiest audit adjustments for an officer to make and one of the hardest for a taxpayer to defend retrospectively.

Rule 42 and 43 reversals missing or understated: Businesses with mixed supply — real estate developers, multi-product FMCG companies, financial service providers — must compute and reverse a proportion of common ITC every month under Rule 42, with annual reconciliation in GSTR-9. Officers independently calculate this reversal from your GSTR-9C Table 5 and Table 12 data and compare it with what you declared. Understating this reversal attracts both demand and interest from the month of credit, not the date of audit.

Credit notes that do not satisfy Section 15(3) conditions: A post-sale discount reduces your GST liability only if the discount was established in the supply agreement before or at the time of supply, linked to the original invoice, and the recipient has reversed the ITC corresponding to the discounted amount. Officers now routinely request evidence of all three conditions — contracts, linked credit note references, and supplier's GSTR-2B ITC reversal confirmation.

Time-of-supply errors on advance receipts for goods: GST on advances received before dispatch of goods arises at the time of receipt — not at dispatch or invoice date. Showing GSTR-1 supply date equal to the invoice date when an advance was received six months earlier generates interest from the advance receipt date. This is particularly common in capital goods manufacturing and high-value B2B supply contracts.

Director remuneration: employee vs. non-employee classification: Entry 6 of Notification 13/2017-Central Tax (Rate) requires a company to pay GST under RCM on fees paid to a director who is not an employee. The test of employment is based on fact — contract terms, PF contributions, Form 16 issuance, and HR records. Officers cross-reference director remuneration disclosed in the company's income-tax return with the RCM entries in GSTR-3B. Discrepancies without a written position paper invite demand.

Valuation anomalies in related-party and distinct-person transactions: Supplies between related parties and between distinct persons (different GSTINs of the same legal entity) must be valued under Rules 28 to 30 of the CGST Rules. If transaction prices are below cost or below open-market value, the officer can substitute the correct value and raise a demand on the differential tax.

Your Rights During a GST Audit

GST audit is not a one-sided exercise. Section 65(3) requires the registered person to provide necessary facility, documents, and information — but it equally obligates the officer to inform you in writing of discrepancies and provide an opportunity to be heard before any finding is recorded.

Your specific rights:

• Right to advance notice: ADT-01 must arrive at least 15 working days before commencement. An audit that commences without proper notice is procedurally defective and can be challenged.
• Right to professional representation: Your CA, CMA, or advocate can accompany you throughout the audit. Brief your representative before day one, not after.
• Right to written rebuttal before ADT-02: Every discrepancy raised must be shared with you, and your reply must be considered before the audit findings are finalised. Submit every rebuttal in writing and obtain an acknowledgement.
• Right to voluntary compliance before SCN: Under Section 65(7) read with Section 73(7), if you pay the tax and interest on accepted discrepancies before an SCN is issued, proceedings are concluded without penalty under Section 73. This is the most valuable right in the statute for audit management.
• Right to confidentiality: Section 158 of the CGST Act prohibits officers from disclosing information gathered during audit to third parties. This protects commercially sensitive pricing, contract, and customer data.

Building Year-Round Audit Readiness

Audit readiness is an operating discipline, not a crisis response. The businesses that navigate audits with minimal disruption run the following practices consistently:

Every month, within 10 days of the 14th (GSTR-2B generation)

• Reconcile GSTR-2B with the purchase register. Annotate every difference in a running mismatch log.
• Issue RCM self-invoices for all reverse-charge payments made — GTA, import of services, unregistered suppliers, and director fees where applicable. Post the corresponding ITC in Table 4(A)(3) of GSTR-3B.
• Cross-check e-way bill data on the e-way bill portal against GSTR-1 outward supply entries — any EWB without a matching GSTR-1 invoice is an audit flag.

Every quarter

• Run a provisional Rule 42/43 reversal computation based on the exempt-to-total supply ratio for the quarter. Do not defer this to the annual return; it creates a large one-time reversal, interest exposure from the original months, and a visible GSTR-9 anomaly.
• Reconcile e-commerce TCS credits in GSTR-2B against your Amazon, Flipkart, or Meesho seller dashboards. Unexplained differences are increasingly being picked up in audit.
• Review all pending credit notes for Section 15(3) eligibility — confirm the discount was in the contract, link it to the original invoice, and check that the recipient has reversed ITC.

Annually, before filing GSTR-9 and GSTR-9C

• Reconcile GST turnover with the trial balance, ITR-6, and AIS to ensure Table 5 of GSTR-9C contains no unexplained differences. Where differences exist — exempt income, schedule III activities, advances adjusted against supply — document the reason in the GSTR-9C disclosure field.
• Run a full Section 17(5) eligibility review across every ITC line claimed in GSTR-3B for the year. Blocked credits — motor vehicle-related, food and beverages, personal consumption items — are the most common adjustment in departmental audits.
• Retain digital and physical copies of all IRN-stamped e-invoices and EWB-numbered e-way bills, with a written explanation for any serial number gaps.

When ADT-01 arrives, a business running these monthly and quarterly disciplines hands the officer a curated, indexed set of files. The audit is narrower in scope, faster in completion, and lower in tax exposure — because the problems have already been identified and corrected before the officer's visit, not during it.

Key Takeaways

• GST audit in 2026 runs on two statutory tracks — Section 65 (officer-led departmental audit) and Section 66 (Commissioner-ordered special audit by a nominated CA/CMA). Mandatory external audit under Section 35(5) was abolished from FY 2021-22.
• ADT-01 gives you 15 working days before commencement — use each one to close GSTR-2B mismatches, compile RCM documentation, and prepare a written position on every grey-area treatment in your books.
• GSTR-9C is the officer's pre-audit roadmap: unexplained differences in Table 5 (turnover) and Table 12B (ITC) are the primary audit selection signals; explain every difference with disclosure notes at the time of filing.
• Voluntary payment before SCN is the highest-value action you can take during an audit — it eliminates the Section 73 penalty entirely, as shown in the worked example where pre-SCN settlement saved Rs. 93,336 versus a contested route.
• RCM on import of services and director remuneration are the two most commonly missed liabilities in departmental audits; if your business uses offshore vendors or pays non-executive directors, review these immediately.
• Rule 42/43 reversals computed monthly — rather than as a year-end adjustment — prevent large retrospective interest exposure and keep the GSTR-9C reconciliation clean.
• Your right to written rebuttal before ADT-02 is finalised is not a formality — use it for every disputed discrepancy; each rebuttal submitted in writing narrows the final demand and creates an evidentiary record if the matter escalates to an SCN or appeal.