Every e-commerce operator (a marketplace like an online platform facilitating supply of goods or services by other sellers) is required to collect Tax Collected at Source (TCS) at 1% (0.5% CGST + 0.5% SGST, or 1% IGST for interstate supplies) on the net value of taxable supplies made through the platform, and deposit it with the government on behalf of the sellers using that platform. For both marketplace operators and the sellers who list on them, this creates specific, ongoing compliance obligations that are easy to get wrong, particularly around reconciliation.
How TCS Works for Marketplace Operators
- The operator computes the net value of taxable supplies — the aggregate value of taxable supplies made through the platform by each seller, reduced by the aggregate value of taxable supplies returned to the seller during that period.
- TCS at 1% is deducted from the amount payable to the seller, and deposited with the government within the prescribed timeline.
- The operator files Form GSTR-8 monthly, reporting details of supplies made through the platform and the TCS collected against each seller's GSTIN.
- The operator must be registered under GST specifically for TCS collection, regardless of its own turnover threshold — this registration requirement is mandatory for any entity operating as an e-commerce operator collecting TCS, with no small-operator exemption.
How Sellers Reconcile and Claim Credit
- TCS collected by the operator reflects in the seller's GSTR-2A/2B and specifically in the TCS credit ledger on the GST portal.
- The seller must accept the TCS credit in their electronic cash ledger through the GST portal — this doesn't happen automatically without the seller taking this reconciliation step.
- TCS credit, once accepted, can be used to pay the seller's own output GST liability, exactly like an advance tax payment — it's not a separate, non-fungible pool of money.
- Reconciliation between the operator's GSTR-8 and the seller's own sales records needs to happen regularly — discrepancies (operator reporting a different supply value than the seller's own books, due to returns, cancellations, or timing mismatches) are common and need active monthly reconciliation, not a once-a-year clean-up at return filing time.
Common Compliance Gaps
- Sellers not claiming TCS credit promptly, leaving cash tied up unnecessarily in the TCS ledger rather than being used to offset current GST liability — a real, avoidable cash flow cost for sellers running thin margins.
- Mismatches between GSTR-8 (filed by the operator) and the seller's own GSTR-1/GSTR-3B, often caused by returns being processed in a different period than the original sale, creating reconciliation gaps that compound if not addressed monthly.
- Sellers operating across multiple marketplaces without a consolidated reconciliation process, leading to TCS credit tracking becoming genuinely difficult to manage as the number of platforms grows — this is where a proper accounting and compliance process, built specifically for multi-platform sellers, pays for itself.
- Marketplace operators mis-registering or under-reporting TCS for smaller or newer sellers, particularly where seller GSTIN details are incorrectly captured at onboarding — sellers should verify their TCS credit ledger reflects the correct GSTIN-linked entries from the start, not assume the operator's system has captured this correctly.
Special Considerations for Sellers Below the Normal GST Threshold
E-commerce sellers face a different registration threshold than offline sellers — a seller supplying goods through an e-commerce operator is generally required to register for GST regardless of turnover (unlike an offline seller who can stay unregistered below the standard threshold), which is a real structural consideration for small sellers deciding whether to list on marketplaces at all, since it brings the full weight of GST registration and return filing along with the marketplace opportunity.
Practical Compliance Checklist for Sellers
- Confirm GST registration reflects correct GSTIN details with every marketplace the business sells through
- Reconcile GSTR-8 (operator-reported) figures against internal sales records monthly, not annually
- Accept TCS credit in the electronic cash ledger promptly each period, rather than letting it accumulate unclaimed
- Track TCS credit and reconciliation separately for each marketplace if selling on more than one platform
- Factor accepted TCS credit into cash flow and advance tax planning, since it's a genuine offset against output liability, not idle cash
For marketplace sellers, TCS reconciliation is one of those compliance areas that seems minor in any single month but compounds into a real cash and audit-trail problem if left unmanaged across multiple platforms and return cycles — building a routine monthly reconciliation habit from day one avoids that build-up entirely.
Perfect Accounting supports multi-platform e-commerce sellers with GST TCS reconciliation, credit claim management, and monthly return filing.