GSTR-3B is the return most registered taxpayers think of as "paying their GST." It is a summary return — you declare your totals, set your output tax against your input tax credit, and pay the balance. Here's how the filing works in practice.
Reviewed by CA Harika Chebolu, FCA · Last updated 2026-06-15
Quick answer
GSTR-3B is the summary return where you declare your supplies, claim input tax credit and pay your GST. Here's how to file it step by step.
Before opening the return, reconcile your sales with your books and your GSTR-1, and check your auto-drafted input tax credit statement against your purchase records. The system shows the credit your suppliers have reported, and you want your claim to line up with it. Doing this reconciliation first means the return is mostly a confirmation exercise rather than a place where errors creep in.
In the return you declare your outward supplies — your total taxable sales for the period, split as the system requires, along with any zero-rated, exempt or nil-rated supplies and any supplies attracting reverse charge. These are summary figures, not invoice-by-invoice, but they should tie back to the detail you reported in GSTR-1 for the same period.
Next you enter your eligible input tax credit. Claim only credit you are entitled to and that is supported by your records and reflected in the system. Some credits are blocked or restricted, and credit on certain expenses cannot be taken, so don't simply claim everything on your purchase invoices. Getting this right both reduces your cash outflow and keeps you out of mismatch trouble.
The return computes your net liability — output tax less eligible input tax credit. You settle this from your electronic credit ledger (for the credit portion) and electronic cash ledger (for the balance payable in cash). If your cash ledger is short, you generate a challan and deposit funds first. The payment is part of filing: the return isn't complete until the tax is paid.
Once the figures and payment are in order, you submit and verify the return using the prescribed authentication. File by the due date — late filing attracts a late fee and interest on tax paid late at 18% per annum. After filing, save the acknowledgement and keep your working papers, because GSTR-3B is the return the department most often checks against your other filings.
You pay your net GST — output tax on your sales minus the eligible input tax credit on your purchases. The credit portion is settled from your electronic credit ledger and the balance is paid in cash through a challan; the return isn't filed until the tax is paid.
GSTR-3B cannot be revised once filed, so accuracy matters. Genuine errors are generally corrected by adjusting in a subsequent period's return rather than by editing the filed one, which is why reconciling before filing is important.
A late fee applies for delay, and interest runs on any tax paid late at 18% per annum. Returns are also often sequential, so a missed period can block later filings — file on time even when it's a nil return.
Want your GSTR-3B reconciled and filed correctly each month? Write to the firm and we'll handle the reconciliation, credit check and filing for you.