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GST return filing guide (2026)

What GSTR-1, GSTR-3B and GSTR-9 are, who files which and when, and how e-commerce sellers reconcile marketplace TCS.

By the Launch My Office team · Updated 2026-06-27 · 6 min read

GST-registered businesses file GSTR-1 (outward sales) and GSTR-3B (a summary return with tax payment) monthly or quarterly, plus GSTR-9 (an annual return) once a year. E-commerce sellers also reconcile the TCS that marketplaces deduct as part of the process.

Two returns do most of the work: GSTR-1 reports your sales invoices, and GSTR-3B summarises sales, input tax credit and the tax you pay. Miss them and a late fee plus interest applies.

The main GST returns

ReturnWhat it reportsFrequency
GSTR-1Outward supplies (sales invoices)Monthly or quarterly (QRMP)
GSTR-3BSummary of sales, ITC and tax paymentMonthly or quarterly (QRMP)
GSTR-9Annual return (consolidation)Yearly (if turnover over ₹2 crore)
GSTR-2BAuto-drafted ITC statement (to reconcile)Monthly (read-only)

QRMP — who files monthly vs quarterly

Businesses with turnover up to ₹5 crore can opt for the QRMP scheme: file GSTR-1 and GSTR-3B quarterly while paying tax monthly via a simple challan. Larger businesses file monthly.

Due dates (typical)

How to file

  1. Reconcile your sales and your GSTR-2B (purchases/ITC) for the period.
  2. File GSTR-1 with your outward invoices.
  3. File GSTR-3B, claim eligible ITC and pay the net tax.
  4. For e-commerce, reconcile the marketplace TCS credit in your cash/credit ledger.

For e-commerce sellers

Marketplaces deduct TCS on your sales and report it; you claim that credit while filing. Multi-state sellers file a set of returns for each state GSTIN — see GST for e-commerce sellers. Our in-house CA handles monthly filing so you don't miss a date.

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Frequently asked questions

Which GST returns do I need to file?

Most businesses file GSTR-1 (sales) and GSTR-3B (summary and tax payment) monthly or quarterly, plus GSTR-9 (annual return) if turnover exceeds ₹2 crore.

What is the QRMP scheme?

Businesses with turnover up to ₹5 crore can file GSTR-1 and GSTR-3B quarterly while paying tax monthly through a challan, instead of filing every month.

What are the GST return due dates?

Typically GSTR-1 by the 11th of the next month, GSTR-3B by the 20th, and GSTR-9 by 31 December of the next financial year. QRMP filers have quarterly dates.

How do e-commerce sellers file GST returns?

They file GSTR-1 and GSTR-3B for each state GSTIN and reconcile the TCS that marketplaces like Amazon and Flipkart deduct, claiming it as credit.

What happens if I miss a GST return?

A late fee per day plus interest on unpaid tax applies, and you cannot file the next period until the previous return is filed.

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