Missing a GSTR-3B deadline hits your wallet directly through late fees under Section 47 of the CGST Act.

LATE FEE STRUCTURE FOR GSTR-3B
The late fee is charged per day of delay, split equally between CGST and SGST:
- Returns with tax liability: Rs 25/day CGST + Rs 25/day SGST = Rs 50/day total
- Nil returns (zero tax liability): Rs 10/day CGST + Rs 10/day SGST = Rs 20/day total

The fee starts from the day after the due date and accumulates until the return is filed.

MAXIMUM CAP ON LATE FEES
Notification No. 19/2021 (Central Tax) introduced concessional caps based on turnover:
- Nil returns: Rs 500 total (Rs 250 CGST + Rs 250 SGST)
- Turnover up to Rs 1.5 crore: Rs 2,000 total
- Turnover Rs 1.5 crore to Rs 5 crore: Rs 5,000 total

For taxpayers with turnover above Rs 5 crore, the statutory maximum under Section 47 of Rs 5,000 CGST + Rs 5,000 SGST (Rs 10,000 total) applies.

INTEREST ON LATE PAYMENT
Apart from late fees, interest under Section 50 applies at 18% per annum on the outstanding tax amount from the day after the due date up to the date of actual payment. Interest applies on the net cash liability.

HOW TO CHECK YOUR LATE FEE
Log in to gst.gov.in. Navigate to Services, Returns, Returns Dashboard. Select the return period and click Prepare Online for GSTR-3B. The system auto-calculates the late fee.

CONSEQUENCES OF NON-FILING
Non-filing of GSTR-3B blocks subsequent returns. If you fail to file for two consecutive tax periods, e-way bill generation is restricted. Persistent non-filing for a continuous period of six months can lead to suo motu cancellation of GST registration under Section 29(2).

PRACTICAL TIP
Set calendar reminders before every GSTR-3B due date. Even if you have zero liability, file the nil return on time. A few days of delay on a nil return still costs Rs 20/day.