GST Late Fee and Interest Calculator

Runs in your browser. Nothing you type is uploaded. Not tax advice: the GST portal works out the amount you pay, so check with your CA.

Which return is late?

GSTR-3B Summary return and tax GSTR-1 Sales details

How do you file?

Monthly Every month Quarterly QRMP scheme

Tax period

Due date

Date you filed or will file

Aggregate turnover in the previous financial year

Up to ₹1.5 crore Cap ₹2,000 ₹1.5 to 5 crore Cap ₹5,000 Above ₹5 crore Cap ₹10,000

The late fee stops growing at this cap per return (CGST and SGST together). A nil return is capped at ₹500 whatever your turnover.

Nil return: no tax to pay for this periodThe late fee is ₹20 a day instead of ₹50.

Tax you pay in cash with this return

This period's tax paid from the electronic cash ledger, after input tax credit. For a late GSTR-3B, interest is charged only on this part (section 50).

More options: interest rate and cash already in the ledger

Interest rate a year

CBIC describes 18% a year as the normal rate under section 50(1).

Cash already in the ledger

The lowest cash ledger balance from the due date until you filed. Rule 88B leaves it out of the interest, and the portal has done so from the January 2026 tax period.

Working out the tax itself? The GST Calculator adds or removes GST, and the GST Invoice Generator lays out a tax invoice for printing.

Free GST Late Fee and Interest Calculator. Runs in your browser, no sign-up. Open the full tool on DigitalSnot →