E-commerce businesses operate under a unique GST compliance framework where transaction data flows through multiple systems — the seller's ERP, the marketplace's settlement engine, the GST portal's TCS credit ledger, and the department's risk analytics platform. When these systems do not reconcile, audit exposure multiplies rapidly.
This article provides a comprehensive audit preparation guide for e-commerce sellers, focusing on TCS reconciliation, marketplace data verification, and the specific checks that GST auditors examine.
The E-Commerce Audit Landscape
The GST department has shifted to a data-driven audit model. As ICMAI's Second Edition of the Handbook on GST Department Audit (January 2026) notes, audits are increasingly "data-driven, analytical and technology-enabled". For e-commerce sellers, this means the department can cross-reference:
- Marketplace settlement reports against GSTR-1 outward supplies.
- TCS credits in GSTR-2B against the platform's GSTR-8 filings.
- Bank receipts against invoiced sales.
- E-way bill data against delivery volumes.
The CAG has begun using AI/ML tools to conduct remote audits and has found a large number of fraud cases through 100% checks of GST and IT databases.
TCS Reconciliation: The Core Audit Check
Every e-commerce operator deducts TCS at 1% (0.5% CGST + 0.5% SGST for intra-state, or 1% IGST for inter-state) on the net value of taxable supplies made through its platform. The TCS is deposited with the government and reported in GSTR-8.
Monthly Reconciliation Process
The reconciliation involves matching three data sets:
- Platform settlement report: Transaction-level sales, returns, and TCS deducted.
- GSTR-2B: TCS credit as reported by the operator in GSTR-8.
- GSTR-1: Outward supplies reported by the seller.
Any difference between these three data sets is an audit flag. The TCS credit statement from the GST portal must be reconciled with the platform's settlement report on a monthly basis, not at year-end.
Common TCS Mismatch Scenarios
- Returns and cancellations: The operator may deduct TCS on gross sales before returns, while the seller reports net of returns.
- Timing differences: TCS deducted in one month may be reported in GSTR-8 for a different month.
- Incorrect GSTIN mapping: TCS credited to the wrong GSTIN due to a mismatch in seller details.
- Non-filing of GSTR-8: The operator has not filed or has filed incorrectly, delaying credit.
Marketplace Data Checks
During an audit, the officer will examine:
- Settlement report vs GSTR-1: Whether all sales reported in the settlement report are reflected in GSTR-1.
- Commission and fees: Whether GST invoices for marketplace commission and fees are obtained and ITC claimed correctly.
- Shipping and logistics: Whether GST on logistics charges is reconciled.
- Advertising fees: Whether advertising and promotion charges are properly documented.
ITC on Marketplace Services
Sellers can claim ITC on GST paid for marketplace commission, platform fees, shipping, advertising, and other services, provided the invoice is in the seller's GSTIN and reflected in GSTR-2B. The auditor will verify that:
- ITC claims match GSTR-2B.
- Blocked credits under Section 17(5) are not claimed.
- ITC on returns and cancellations is properly reversed.
Documentation Requirements
- Monthly TCS reconciliation statements.
- Platform settlement reports (downloaded and saved).
- GSTR-1, GSTR-3B, and GSTR-9 for the audit period.
- GST invoices from marketplaces for fees and commission.
- Bank statements showing settlements.
Practical Audit Preparation Steps
- Build a monthly TCS reconciliation workbook with separate tabs for each marketplace.
- Reconcile GSTR-2B TCS credits against platform TCS reports before claiming credit.
- Accept TCS credit on the GST portal promptly — pending credits are an audit flag.
- Maintain separate GSTINs for each state where inventory is stored.
- Reconcile marketplace fees with GSTR-2B monthly.
- Document all follow-ups with marketplaces for GSTR-8 corrections.
Conclusion
E-commerce GST audits focus on data integrity across multiple systems. Sellers who maintain monthly reconciliation discipline, accept TCS credits promptly, and reconcile marketplace fees can navigate audits with confidence. Those who rely on year-end reconciliation face significant exposure.
At Anuj Desai & Associates, we provide end-to-end GST audit preparation services for e-commerce sellers, including TCS reconciliation, marketplace data verification, and representation before GST authorities. Our team can help you build audit-ready processes.
For a confidential consultation, contact us at office@anujdesaiassociates.com or call 9619456656. Visit our website at https://anujdesaiassociates.com or connect with our founder on LinkedIn at linkedin.com/in/ca-anuj-desai-122547230.