GST interest calculator
Work out interest on GST paid after its due date, or on input tax credit that was used when it shouldn't have been.
Why is interest due?
Interest is on the tax you pay in cash after input tax credit, not on the gross liability.
Today, until you pick a date.
Enter the amount and the due date.
Questions people ask
- What is the interest rate on late GST payment?
- 18% a year under Section 50(1) of the CGST Act. It is simple interest, counted by the day.
- When is the 24% rate used?
- Section 50(3) charges 24% a year on input tax credit that was wrongly or excessively claimed and also used. Credit that was claimed but not used does not attract it. Sources disagree on the rate for some wrongly availed credit, so confirm with a CA if your case turns on this.
- How is GST interest calculated?
- Tax × rate × days late ÷ 365. For ₹50,000 paid 30 days late at 18%, interest is about ₹739.73.
- On which amount is interest charged?
- On the tax you pay in cash after setting off input tax credit, not on the full liability. That has applied since 1 July 2017.
- Is there a maximum on GST interest?
- No. Unlike the late fee, interest has no cap.
- Which days are counted?
- From the day after the due date up to the day you pay.
Rules last checked 18 October 2026. This is general information, not tax advice. Check the notification or ask your CA before you rely on a figure.
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