//

Common Issues Raised in GST(Goods And Services Tax) Department Audit 2026

by | May 13, 2026 | GST

                                                        GST Compliance Intelligence · India · May 2026

                                                               Departmental Audit · Special Analysis

 

An authoritative guide to the objections, demands, and scrutiny areas most frequently raised by GST audit officers — and how businesses can defend themselves with sound legal and documentary grounding.

Updated: May 2026  |  Applicable Law: CGST Act, 2017  |  Relevant Forms: ADT-01, ADT-02, GSTR-9, GSTR-9C

The GST Department Audit under Section 65 of the Central Goods and Services Tax (CGST) Act, 2017 has intensified significantly in 2026. With the GST Network (GSTN) now deploying machine-learning algorithms to cross-reference data across e-invoices, E-Way Bills, Income Tax TDS/TCS records, and customs import data, audit notices are being triggered with far greater precision and frequency than in previous years. Businesses that were previously compliant in spirit but loose in documentation are finding themselves under serious scrutiny.

A departmental audit commences with the issuance of FORM GST ADT-01, typically served at least 15 working days before the audit commencement date. The audit must be completed within three months of commencement, extendable by six months for sufficient reason. Upon conclusion, findings are communicated to the taxpayer in FORM GST ADT-02, after which demand and recovery proceedings may follow under Sections 73 or 74 of the CGST Act.

This article examines the most common issues raised during such audits, the legal positions available to taxpayers, and the corrective steps that can mitigate exposure.

“GST audits in 2026 are no longer routine verifications. They are data-driven exercises where the department already knows the discrepancy before walking in. Preparedness is no longer optional.”

01.  Input Tax Credit (ITC) Irregularities

ITC-related objections are by far the most common category in departmental audits. The department typically raises demands under the following sub-heads:

  1. ITC claimed on ineligible expenses under Section 17(5):Section 17(5) of the CGST Act specifically blocks ITC on items such as food and beverages, outdoor catering, beauty treatments, health services, cosmetic surgery, memberships of clubs, and motor vehicles used for non-business purposes. Auditors frequently flag ITC claimed on these categories. However, certain exceptions exist — canteen services mandatory under the Factories Act, uniform-related expenses for employees, and mobile phones used for official duties have been upheld by courts.
  2. ITC claimed without matching GSTR-2B:Under the amended Section 16(2)(aa), ITC can be claimed only if the supplier’s invoice or debit note is reflected in the taxpayer’s GSTR-2B. Auditors compare ITC claimed in GSTR-3B with the GSTR-2B auto-populated data and raise demands for the differential.

 

Legal Position: Where a supplier has failed to upload invoices or has not paid tax to the government, judicial precedent supports the taxpayer’s position that the law cannot compel a person to do that which is impossible — the doctrine of Lex Non Cogit Ad Impossibilia. This was affirmed in Indian Seamless Steel & Alloys Ltd v. UOI [2003 (156) ELT 945 (Bom.)] and upheld by the Supreme Court. The reasoning finds further support in CBIC Circular No. 92/11/2019-GST dated 07.03.2019.

  1. Business promotion and gifts: ITC on goods used for “business promotion” is sometimes disallowed on the ground that they constitute gifts. However, where such expenses are genuinely incurred in the course of business (e.g., samples, demonstration units), the credit should be eligible and is supported by departmental circulars.
  2. Employee welfare expenses: Credit on employee-related expenses — safety equipment, ID cards, uniforms, official mobile phones — is eligible when incurred in the course of discharging office duties. In Steel Authority of India Ltd v. CCE [2014 (301) ELT 592 (CESTAT Delhi)], credit on shoes used by workers in a steel plant was held to be eligible.

Penalty Exposure Wrongly availed ITC: Reversal of credit + interest at 18% p.a. + penalty of 10% of tax (minimum ₹10,000) under Section 73, or up to 100% of tax under Section 74 in cases of fraud or wilful misstatement.

02.  Reverse Charge Mechanism (RCM) Non-Compliance

The Reverse Charge Mechanism shifts the tax liability from the supplier to the recipient. Audit teams routinely scrutinise whether the registered person has correctly identified and discharged RCM liability on all applicable transactions under Section 9(3) and 9(4) of the CGST Act.

Typical RCM demands are raised under the following categories:

  • Legal services received from advocates or firms of advocates
  • Services from Goods Transport Agencies (GTA) where the recipient is a company, LLP, or registered person
  • Import of services from overseas vendors (i.e., cross-border service procurement)
  • Sponsorship services received from non-registered persons
  • Renting of immovable property from unregistered landlords
  • Security services from non-corporate entities

RCM on import of services is a particularly complex area. Not all payments to foreign vendors attract RCM. The Place of Supply (POS) must be determined under Section 13 of the IGST Act. Where the place of supply is outside India — such as training attended physically abroad, repair services performed on goods outside India, or travel and accommodation outside India — no RCM liability arises on such transactions.

Practical Guidance: Taxpayers should prepare a detailed reconciliation of all expenses, clearly bifurcating categories covered under RCM from those not covered. Voluntary payment of RCM tax (with self-invoice) during the audit process allows simultaneous availing of ITC for such payments, per CBIC Circular No. 211/2024, even for amounts relating to past periods paid at the time of audit.

03. Turnover Mismatches Across Returns and Financial Statements

Turnover discrepancies are the second most commonly cited issue in GST departmental audits. The department cross-references multiple data sources simultaneously:

  • GSTR-3B (monthly summary returns) vs. GSTR-1 (outward supply details)
  • GSTR-1 vs. the audited Profit & Loss Account or financial statements
  • GSTR-9 (annual return) vs. GSTR-9C (reconciliation statement)
  • GST returns vs. TDS/TCS data pulled from the Income Tax portal
  • GST returns vs. sales register maintained in books of account

Common sources of unexplained variance include: income from other sources (interest, dividend, rent) which may be exempt or outside the purview of GST but appear in the P&L; advances received from customers declared in GST returns but recognised as revenue in a different period in books; credit notes and sales returns reconciled differently; and branch transfers reported under GST as supplies but not as sales in standalone financials.

Audit Tip: In all cases of variance, a written reconciliation statement with a line-by-line explanation is the most effective tool. The onus shifts to the taxpayer once a discrepancy is identified. A pre-prepared reconciliation demonstrates good faith and substantially reduces the risk of a formal demand.

04. Incorrect GST Rate Application

Incorrect classification of goods or services leading to payment of tax at a lower rate than applicable is a frequently cited objection. The GST rate schedule has over 1,200 HSN/SAC entries, and classification disputes are common in industries such as food processing, pharmaceuticals, textiles, construction, and information technology services.

The department may demand the differential tax along with interest from the date of original liability. Taxpayers may rely on Advance Rulings and CBIC Clarification Circulars to support their classification positions. Where a bona fide classification error is involved and the taxpayer can demonstrate a reasonable interpretation of the tariff entry, penalties are often waived under Section 73 (non-fraud cases).

05. E-Invoicing and E-Way Bill Compliance Gaps

Since the mandatory rollout of e-invoicing for businesses with aggregate turnover exceeding ₹5 crore (subsequently lowered), the department has access to real-time invoice-level data. Auditors now routinely check:

  • Whether all B2B invoices above the threshold were reported on the Invoice Registration Portal (IRP) and carry a valid IRN (Invoice Reference Number)
  • Whether e-invoices carry the correct GSTIN of the recipient, HSN code, and tax amount
  • Whether E-Way Bills were generated for all goods movements above ₹50,000 in value
  • Mismatches between E-Way Bill data and the actual invoice or GSTR-1 data
  • Cases where E-Way Bills were generated but GSTR-1 was not filed, or vice versa

Failure to generate e-invoices where mandatory attracts a penalty of ₹10,000 per invoice under Section 122 of the CGST Act. Systemic non-compliance can result in cancellation of GST registration in egregious cases.

06. Short Payment of Tax on Advances

Under Section 12 and 13 of the CGST Act, GST is payable at the time of receipt of advance for supply of goods (subject to the exemption for registered persons under notification for goods) and supply of services. Many businesses fail to discharge GST on advances received, recognising the liability only upon issuance of the final invoice. This creates a tax short-payment scenario for the intervening period.

Auditors typically examine the “Advances Received” ledger in the books and cross-reference it with the GST liability reported in GSTR-3B. Unexplained advances that do not correspond to any GST payment are routinely flagged.

07. Export Refund and Zero-Rated Supply Issues

For exporters and SEZ-supplying entities, audit teams scrutinise refund claims under Section 54 of the CGST Act. Common objections include:

  • Mismatch between shipping bill data and GSTR-1 export invoices
  • IGST refunds claimed on exports where the Foreign Inward Remittance Certificate (FIRC) or Bank Realisation Certificate (BRC) is not available
  • Exports claimed as zero-rated but without proper LUT (Letter of Undertaking) on record
  • Refund of accumulated ITC on inverted duty structure claims with incorrect computation of eligible ITC

08. Valuation Disputes and Related Party Transactions

Under Section 15 of the CGST Act read with the GST Valuation Rules, the value of supply between related parties (as defined under Section 15 read with Rule 28) must reflect the open market value or be arrived at as per the prescribed methods. Undervaluation of supplies between holding and subsidiary companies, or among associated enterprises, is a significant area of audit scrutiny.

The department may challenge valuations where the transaction value appears below cost of production, where free supplies are made between related entities, or where stock transfers at nil consideration are not accompanied by a proper taxable supply documentation.

Quick Reference: Issue Summary

# Issue Area Key Risk Penalty Provision
1 ITC Irregularities Section 17(5) block; GSTR-2B mismatch S. 73 / S. 74 CGST Act
2 RCM Non-Compliance GTA, legal services, import of services S. 73 + Interest 18% p.a.
3 Turnover Mismatches GSTR-1 vs 3B vs P&L vs TDS data Demand + S. 73/74
4 Incorrect GST Rate Wrong HSN/SAC classification Differential tax + Interest
5 E-Invoice / E-Way Bill Gaps Missing IRN; E-Way Bill mismatches ₹10,000 per invoice (S. 122)
6 Tax on Advances Advance received, GST not paid Short tax + Interest 18% p.a.
7 Export Refund Issues LUT missing; shipping bill mismatch Refund denial / Recovery
8 Valuation / Related Party Below-cost supplies; nil stock transfers Demand under Rule 28

Audit Readiness: Key Practices for 2026

Given the GSTN’s enhanced data analytics capability in 2026 — including AI-based anomaly detection, triangulation of income tax and customs data, and risk scoring at the taxpayer level — businesses must treat audit preparedness as an ongoing process rather than a year-end exercise.

  • Monthly three-way reconciliation: Reconcile GSTR-1, GSTR-3B, and books of account every month before filing. Do not wait for the annual return cycle.
  • GSTR-2B discipline: Claim ITC only after verifying GSTR-2B. Follow up actively with vendors who fail to upload invoices before the credit window closes.
  • RCM liability register: Maintain a dedicated register of all services liable to RCM; discharge liability in the applicable return period with a self-invoice.
  • Maintain documentary trails: Every credit claimed should have a corresponding invoice, proof of business purpose, and — where applicable — proof of payment and goods receipt.
  • GST health check annually: Commission a pre-audit GST health check by a qualified CA or CMA before the departmental audit season to identify and rectify exposures proactively.
  • Use DRC-03 for voluntary corrections: Where a short payment is identified self-assessing, pay the differential voluntarily using FORM DRC-03 to reduce penalty exposure.
  • Preserve advance rulings and circulars: Where a rate or classification position is debatable, maintain a file of the advance ruling, circular, or judicial precedent relied upon.

Conclusion

GST departmental audits in 2026 are operating in an environment of unprecedented data transparency. The department’s ability to detect discrepancies across returns, invoices, E-Way Bills, income tax records, and customs data means that the era of oversight-by-sampling is giving way to near-comprehensive scrutiny for flagged taxpayers.

The issues discussed in this article — ITC irregularities, RCM gaps, turnover mismatches, incorrect rate application, e-invoicing failures, taxation of advances, export compliance, and related-party valuation — are not merely technical: each can result in significant tax demands, interest charges, and penalties that affect cash flows and business continuity.

The most effective defence is a robust, proactive compliance posture: regular reconciliations, sound documentation, and the willingness to use available mechanisms such as DRC-03 and voluntary RCM payment to correct positions before the auditor arrives. Where demands are raised, judicial precedents and CBIC circulars provide meaningful lines of defence that experienced practitioners can deploy effectively.