Explanation
Under CGST Act Section 47: GSTR-1 late fee is ₹50/day (₹25 CGST + ₹25 SGST) for returns with any supply; ₹20/day (₹10+₹10) for nil GSTR-1. GSTR-3B late fee is the same — ₹50/day non-nil, ₹20/day nil. Interest at 18% per annum (Section 50) applies on unpaid tax from the due date of GSTR-3B, calculated on net tax liability. Periodic CBIC notifications (especially under amnesty schemes) have reduced or waived late fees — check the latest notification before filing a belated return. Cannot file GSTR-3B or GSTR-1 more than 3 years past due date. Verify on the GST portal before filing.