Free tool
GST Late Fee and Interest Calculator
Estimate the late fee and interest for a GSTR-1 or GSTR-3B filed after its due date. Nothing you enter is saved or sent anywhere: the calculation runs in your browser.
Your estimate for GSTR-3B
Enter the due date to see the late fee and interest.
This is an estimate based on the standard late fee and interest rules. It does not include government waiver schemes, interest on wrongly availed input tax credit, or other penalties, and rules change. Confirm the amount on the GST portal or with your CA before paying. Not tax advice.
GST late fee questions
How is the GST late fee calculated?
For a return filed after its due date, the late fee is charged for each day of delay: ₹50 a day (₹25 CGST plus ₹25 SGST) for a return with tax to pay, or ₹20 a day for a nil return. A cap applies, based on your annual turnover.
What is the interest on late GST payment?
Interest is charged at 18% a year on tax paid after the due date, counted from the day after the due date until the day you pay. Interest at a higher rate applies where input tax credit was wrongly availed or used. This calculator covers the 18% case only.
Is the late fee charged on top of interest?
Yes. The late fee is for filing late and interest is for paying late, so a return that is both late and has tax due can attract both.
Can the late fee be waived?
The government has occasionally announced waivers or amnesty schemes for specific periods. This calculator does not include them, so check the GST portal and your CA for any scheme that applies to your return.
Avoid late fees with books that are ready on time
Flick AI organizes your invoices and bank statements into GST-ready data each month, so returns are not left to the last day. Try it on your own documents.