GST Late Fee & Interest Calculator
Filing GSTR-3B or GSTR-1 late? Enter the delay and your tax to see the exact late fee (with the turnover cap) plus 18% interest. Free, instant.
Late fee split equally as CGST + SGST. Interest runs day-after-due-date to date of payment on the cash portion of tax. Estimate — confirm on the portal.
OnGravy tracks every GST due date, prepares GSTR-1 and GSTR-3B from your books, and reminds you before the deadline — so late fees and interest simply stop happening.
Try OnGravy →How the late fee and interest work
Two separate charges apply to a late return. The late fee accrues per day (₹50, or ₹20 for a nil return) up to a cap set by your turnover. Separately, 18% interest runs on the net tax you pay in cash, from the day after the due date until you actually pay. This tool adds both.
Frequently asked
The late fee is ₹50 per day (₹25 CGST + ₹25 SGST) for a return with tax, and ₹20 per day (₹10 + ₹10) for a nil return — subject to a maximum that depends on your annual turnover.
For a nil return the cap is ₹500. For returns with tax the cap is ₹2,000 if turnover is up to ₹1.5 crore, ₹5,000 for ₹1.5–5 crore, and ₹10,000 above ₹5 crore (split equally as CGST and SGST).
Interest is 18% per annum on the net tax paid in cash, calculated from the day after the due date to the date of payment. It applies to GSTR-3B (which carries the tax); GSTR-1 has no tax and so no interest.
Yes — GSTR-1 also attracts a late fee on the same ₹50/day (₹20 nil) basis with the turnover cap, but no interest, because GSTR-1 reports outward supplies rather than paying tax.