How to Prepare for a GST Audit as an Online Seller

A GST audit for an e-commerce seller looks different from one for a traditional retailer, mostly because of TCS and the sheer number of individual transactions involved — auditors typically want to see that your reported sales, your TCS claims, and your marketplace settlement data all tell a consistent story.

The core documents an auditor will want: your GSTR-1 and GSTR-3B filings for the audit period, your GSTR-2B showing TCS credit claimed, your marketplace settlement reports for the same period, and ideally a reconciliation showing how the numbers in each connect to each other — not just that they exist separately.

The most common finding in these audits isn’t fraud, it’s timing mismatches that were never explained: sales recognized in one period showing settlement or TCS activity in a different one, with no note explaining why. Auditors generally accept legitimate timing gaps (settlement dates lag order dates) — what they flag is an unexplained, undocumented gap that looks like it could be either an error or something worse.

The single most useful thing a seller can do ahead of an audit is have order-level reconciliation records on hand, not just monthly summary totals — being able to show, for any specific order an auditor asks about, its sales record, its settlement record, its TCS treatment, and the reason for any variance, turns what could be a multi-day back-and-forth into a same-day answer.

This is also the strongest argument for reconciling monthly rather than only at filing time or audit time: reconstructing order-level detail six or twelve months after the fact, from memory or scattered files, is dramatically harder than having it already organized as you go.