Missing your GSTR-3B due date is costly. You face an immediate late fee plus 18% annual interest on any unpaid tax — and the penalties compound every day. Here is exactly what you owe if you file late, and how to make sure it never happens.
GSTR-3B Late Fee Structure (2025-26)
- ₹50 per day (₹25 CGST + ₹25 SGST) for returns with tax liability
- ₹20 per day (₹10 CGST + ₹10 SGST) for nil returns (zero turnover)
- Maximum late fee capped at ₹10,000 (₹5,000 CGST + ₹5,000 SGST) per return
- Late fee starts the day after due date and stops when you actually file
Interest on Unpaid GST
Beyond the late fee, you also pay 18% per annum simple interest on any GST that was unpaid by the due date. Interest is calculated daily from the due date until the date of payment. Example: You owe ₹50,000 GST and pay 30 days late. Interest = ₹50,000 × 18% ÷ 365 × 30 = ₹739. Plus late fee of ₹50 × 30 = ₹1,500. Total extra cost: ₹2,239 for a 30-day delay.
GSTR-3B Due Dates (2025-26)
- Turnover > ₹5 crore: 20th of the following month
- Turnover ≤ ₹5 crore (Category 1 states): 22nd of following month
- Turnover ≤ ₹5 crore (Category 2 states): 24th of following month
- States in Category 1: Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, Delhi, Rajasthan, Uttar Pradesh, Bihar, West Bengal, Assam, Odisha, and more
How to Pay Late Fee and Interest
- Log in to gst.gov.in
- Go to Services → Ledger → Electronic Cash Ledger
- Create a challan for late fee (head: Fees & Penalties) and interest separately
- Pay via net banking, UPI, or NEFT
- Then file your GSTR-3B — the system will automatically deduct the fees from your electronic cash ledger
How to Never Miss a GSTR-3B Deadline Again
- Set a calendar reminder 5 days before the due date every month
- Keep your accounting software updated throughout the month — do not leave it all to the last week
- Use Credwik: GST data is always ready, you can file in minutes, not hours
- If you are unsure of your tax position, get a CA to review — but do not delay filing
- File even if you cannot pay — filing stops the late fee; interest only runs on unpaid tax
What Happens if You Keep Missing Returns?
Persistent late filing leads to: suspension of GSTIN, blocking of e-way bill generation, inability of your buyers to claim ITC (which damages your business relationships), and potential scrutiny or audit by GST authorities. It is far cheaper to file on time every month.
