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GST Late Fee & Interest Calculator is free — no account needed.It is one of 29 tools inside MNB Cortex, which watches your receivables and deadlines and emails you before they cost you money.Check your own numbersPlans from ₹799

GST Late Fee & Interest

What a late GSTR-3B will actually cost you

Late fee / day
₹50
Late fee
₹1.0K
Interest (18% p.a.)
₹1.2K
Late fee + interest
₹2.2K

Plus the tax itself, ₹1.20 L — total remittance ₹1.22 L.

GSTR-3B late fee is ₹50/day (₹25 CGST + ₹25 SGST), or ₹20/day (₹10 + ₹10) for nil returns. The maximum is ₹500 for a nil return, and otherwise ₹2.0K / ₹5.0K / ₹10.0K by annual aggregate turnover. Interest runs at 18% p.a. under section 50 on the tax paid late.

CBIC notification 20/2021, current to September 2026. Amnesty and reduced-fee schemes for specific periods can lower this further, and GSTR-1, GSTR-9 and GSTR-4 have their own caps — confirm the exact figure on the GST portal before paying.