Missed a GST Return Deadline? Here's What Happens Next

Late fees, interest and notice risk explained — and the fastest way to get back on track.

What actually happens when you miss the date

Almost every registered taxpayer misses a GST deadline at some point — a busy month, a bank reconciliation that took longer than planned, a staff change. What matters is understanding exactly what starts accruing the moment the due date passes, so you can decide how urgently to act.

• Late fee: charged per day of delay on GSTR-1 and GSTR-3B, split between CGST and SGST, with a lower rate for nil returns and an annual turnover-based cap set by CBIC notification. It keeps adding up daily until you file — it does not pause while you decide what to do.
• Interest: 18% per annum on the tax amount that was actually due, calculated from the original due date until the date of payment.
• ITC and filing locks: if GSTR-3B stays unfiled for two consecutive tax periods, GSTR-1 filing for the next period gets blocked, and your buyers may see delayed or missing input tax credit on their GSTR-2B.
• Notice risk: prolonged non-filing can trigger a system-generated notice (ASMT-10 or similar), and if that also goes unanswered, the department can proceed to a best-judgment assessment under Section 62 — usually at a higher tax figure than what you'd have reported yourself.

What to do, in order

1. File the pending return first, even though it's late. The late fee is calculated up to the date of filing, so every day you wait adds to the bill.
2. Pay the tax and interest. If you're filing voluntarily before any notice, you can settle the shortfall through Form DRC-03.
3. Reconcile against GSTR-2B for the same period, so you don't lose input tax credit you're entitled to simply because the filing was delayed.
4. If a notice has already arrived, respond within the window given rather than waiting it out — an unanswered notice almost always escalates to a higher demand than a timely reply would.