GST Late Fee & Penalty Rules Explained (2026, with Tables)

Missed a GSTR filing date? Two separate meters start running: a fixed late fee per day, and interest on any unpaid tax. Business owners routinely confuse the two - this guide separates them clearly and shows the current structure.

Note: GST provisions are amended frequently through notifications. Treat the figures below as the commonly applicable structure and verify the latest notification (or ask your CA) before filing.

Late fee: fixed per day, capped by turnover

Late fee applies per return, per day of delay, split equally between CGST and SGST. For normal (non-nil) GSTR-3B/GSTR-1 filings, the widely applicable structure has been:

Commonly applicable late-fee structure - confirm current notification before filing

Interest: 18% per annum on unpaid tax

Separately from the late fee, Section 50 levies interest - commonly 18% per annum - on the tax paid late, calculated day-wise from the due date to the payment date on the net cash liability. Even a few days of delay on a large liability can cost more in interest than the late fee itself.

Worked example

Suppose a regular taxpayer (turnover ₹2 crore) files GSTR-3B 30 days late with ₹1,00,000 tax paid in cash. Late fee: 30 days × ₹50 = ₹1,500. Interest: ₹1,00,000 × 18% × 30/365 ≈ ₹1,479. Total damage ≈ ₹2,979 - roughly half from each meter. This is exactly the calculation our late-fee calculator automates.

How to avoid the trap entirely

• File nil returns on time too - the ₹500 cap still stings across months and delays e-way bill generation once returns lapse.
• Remember the monthly rhythm: GSTR-1 (11th) and GSTR-3B (20th, or 22nd/24th for QRMP states).
• If cash is short, file the return and pay what you can - filing stops the late fee meter; interest then applies only to the unpaid portion.