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GST late fee and interest calculator

Late fee runs per day under each Act and stops at a ceiling set by your turnover. Interest runs at 18% a year on the tax you pay in cash, and does not stop at all. This works out both, and what one more day of delay costs.

Return details

GSTR-3B — summary and payment

Nil returns are ₹20 a day instead of ₹50, and carry no interest.

₹

Cash portion only. Liability set off from the credit ledger does not attract interest, which is why this figure is usually lower than the portal’s rough estimate.

Turnover decides the ceiling on the late fee, not the daily rate.

Total to pay if you file on 26 Aug 2026

₹6,229

37 days late · GSTR-3B

Late fee — CGST @ ₹25/day₹925
Late fee — SGST @ ₹25/day₹925
Interest @ 18% on ₹2,40,000₹4,379
Total₹6,229
Every extra day costs₹168
Late-fee ceiling per Act₹2,500
Ceiling reached on28 Oct 2026
Every day you wait adds ₹168. Late fee keeps accruing until it hits the ceiling; interest keeps running regardless.
Late fee is charged separately under the CGST and SGST Acts — half each — so the daily figure you see quoted as ₹50 is ₹25 under each Act. Interest runs at 18% a year from the due date to the date of payment, on the cash portion of the liability only.

You just typed dates you had to look up.

Inside Taxlabs this number sits on your home screen for every open return, computed from your own filings, with reminders before the deadline rather than after it.

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Frequently asked

How much is the late fee for GSTR-3B?

₹50 a day in total — ₹25 under the CGST Act and ₹25 under the SGST Act. A nil return is ₹20 a day. The fee is capped per return, and the ceiling depends on your turnover: ₹1,000 per Act up to ₹1.5 crore, ₹2,500 per Act up to ₹5 crore, and ₹5,000 per Act above that. A nil return caps at ₹250 per Act.

How is GST interest calculated?

At 18% a year, from the day after the due date to the date of payment, on the tax actually discharged in cash. Liability set off from your electronic credit ledger does not attract interest — which is why the correct figure is usually lower than the portal’s initial estimate.

Does the late fee ever stop growing?

The fee does, once it hits the ceiling for your turnover band. Interest does not — it runs until the tax is actually paid.

Can late fee be waived?

Only by a government notification, which is issued from time to time as an amnesty. It is not something a taxpayer can apply for on their own.

What happens to my customers if I file GSTR-1 late?

The input credit on your invoices does not reach their GSTR-2B, so they cannot claim it in that period. That is usually what prompts the phone call, well before the late fee does.

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Based on the late-fee and interest provisions in force as at the date of publication, including the turnover-banded ceilings notified for GSTR-1 and GSTR-3B. Amnesty notifications are not applied automatically. Nothing you type is sent to us or stored.