What If You Don't File Your GST Return on Time? Late Fee, Interest and Cancellation

Missing a GST return deadline is not a single penalty. It is a sequence of consequences, each switched on automatically by the portal at a different point. The first few days cost a small, capped late fee. The later stages stop you trading: your e-way bills will not generate, your customers lose their credit, and the officer proposes to cancel your registration.

Here is what happens, stage by stage, and how to get back.

What happens, and when

Your customers feel it too. If GSTR-1 is not filed, your invoices do not reach their GSTR-2B, and they cannot claim credit on them. In B2B trade, that usually brings a phone call before it brings a notice.

The late fee

Section 47 of the CGST Act levies a late fee per day of delay. The statutory amount has been reduced by notification, and for GSTR-3B for tax periods from June 2021 onwards (Notification 19/2021-Central Tax, read with the earlier Notification 76/2018) the position is:

GSTR-1 carries a late fee on the same pattern, under a parallel notification. Each return is charged separately, so a business that misses both GSTR-1 and GSTR-3B for a month pays two late fees.

Three practical points:

• The late fee is paid in cash. It cannot be discharged from the electronic credit ledger, however much ITC you have.
• The portal computes it in Table 5.1 of the next return you file, and in the late GSTR-3B itself.
• The annual return GSTR-9 has its own late fee, linked to turnover and capped as a percentage of it. A missing annual return is a separate default even when every monthly return was filed.

Waivers have been granted in the past. The most significant capped the fee for GSTR-3B returns from July 2017 to April 2021 if filed within a specified window in 2021. They are announced occasionally and without warning. Do not hold back a return waiting for one: interest and the other consequences keep running regardless.

Interest

Interest is the cost that is not capped, and on a large return it quickly overtakes the late fee.

Section 50(1): tax paid late. Interest at 18% a year runs from the day after the due date to the date of payment. Where the return is filed late, interest is charged on the net tax paid in cash, not on the portion set off against input tax credit.

Section 50(3): credit wrongly availed and utilised. Interest at 18% where ITC was wrongly availed and actually used to pay tax. Credit that was wrongly availed but sat unused in the ledger does not attract it.

A worked example: GSTR-3B for a month showing ₹3,00,000 of tax, of which ₹2,00,000 is covered by ITC and ₹1,00,000 is paid in cash, filed 40 days late. Interest is roughly ₹1,00,000 × 18% × 40/365, about ₹1,973. The late fee for a business with ₹1 crore turnover is ₹50 × 40 = ₹2,000, at the ₹2,000 cap. Leave it for a year and the late fee stays at ₹2,000 while the interest grows past ₹18,000.

Since early 2026 the portal computes interest on late-reported liability itself. It uses the document dates of invoices reported in GSTR-1/1A/IFF and asks you to confirm a "Tax Liability Breakup" before filing. Check that breakup. The figure is system-generated, not necessarily right, and GSTN has had to issue advisories correcting wrongly computed interest.

Notices and best judgment assessment

GSTR-3A (Section 46). The portal issues a notice requiring you to file within 15 days. It does not itself impose any amount, but it starts the clock on the next stage.

ASMT-13 (Section 62). If you still do not file, the officer may assess your tax liability to the best of their judgment, using whatever material is available (e-way bills, your customers' returns, previous filings), and raise a demand in ASMT-13 with interest and penalty. These assessments are rarely generous.

The assessment order is deemed withdrawn if you file a valid return within sixty days of its service. You still pay the late fee and interest, but the best judgment demand falls away. This is the most useful window in the whole sequence, and many businesses let it pass because they assume the order is final.

If an ASMT-13 order or any other notice has already arrived, read our guide on what to do when you get a GST notice.

E-way bill blocking

Under Rule 138E, a taxpayer who has not filed GSTR-3B (or, for composition taxpayers, CMP-08) for two or more tax periods cannot generate e-way bills. For a trader in goods, this is the point at which the business physically stops.

Unblocking happens automatically once the returns are filed and the default falls below two periods. There is also a route to apply to the jurisdictional officer in EWB-05 for unblocking on sufficient cause, but filing the returns is faster.

Cancellation of registration

Rule 21 prescribes the continuous period of non-filing that permits cancellation under Section 29(2)(c):

• monthly filers: returns not filed for a continuous period of six months;
• QRMP filers: returns not filed for two continuous tax periods (two quarters);
• composition taxpayers: the annual return not filed for more than three months after its due date.

The officer issues a show cause notice in REG-17, usually suspending the registration at the same time. If you file every pending return and pay the tax, interest and late fee before the order is passed, the proceedings are dropped (REG-20). After a cancellation order in REG-19, revocation is applied for in REG-21 within 90 days of service of the order, extendable on sufficient cause. Again, the returns must be filed first. The full sequence is in our post on GST cancellation and revocation.

Cancellation on the officer's motion can be retrospective. Your customers then lose credit on everything you invoiced in the retrospective period, which is the commercial damage that outlasts the procedure.

The three-year bar

Since the Finance Act 2023, returns under Sections 37, 39, 44 and 52 (GSTR-1, GSTR-1A, GSTR-3B, GSTR-4, GSTR-5, GSTR-6, GSTR-7, GSTR-8, and GSTR-9/9C) cannot be filed after three years from their due date. The portal has enforced this from the November 2025 tax period. For example, from 1 December 2025, GSTR-3B for October 2022 and earlier could no longer be filed.

Being time-barred does not extinguish the tax. The department can still determine and recover it through proceedings under Section 73 or 74, without the benefit of your own return. You simply lose the ability to put your figures on record yourself. Any return approaching the three-year line should be filed now.

How to clear a backlog

1. List every pending return from the Returns Dashboard: GSTR-1/IFF, GSTR-3B, GSTR-9, and for composition dealers CMP-08 and GSTR-4. Mark any that are close to three years old.
2. Rebuild the data for each period from your books, sales and purchase registers, bank statements and e-way bills. If you issue e-invoices, start from the IRN data, because that is what has already been reported to the system.
3. File GSTR-1 period by period, oldest first. Your customers' credit depends on it, and GSTR-3B liability is auto-populated from it.
4. File GSTR-3B in sequence. The portal requires the earlier period to be filed before the next. Pay the cash tax, interest and late fee for each one.
5. Claim old ITC carefully. Credit for a financial year can only be claimed up to 30 November of the following year (or the annual return date, if earlier). Credit from older periods cannot be revived by filing late.
6. Reply to any open notice (GSTR-3A, ASMT-13, REG-17) with the filing acknowledgements attached, within its own time limit.
7. File the annual return for each year once the monthly returns are complete.

For the mechanics of the monthly return itself, see how to file GSTR-3B online.

What if it goes wrong?

• You cannot pay the full tax now. You cannot file GSTR-3B with part of the tax unpaid, because the portal requires the liability shown to be fully offset first. So file the earliest periods first, as cash allows, and ask the jurisdictional officer about payment in instalments under Section 80 once a demand exists. Do not leave all periods unfiled because one cannot be paid.
• The business has shut down. Non-filing does not close a registration. File the pending returns, apply for cancellation in REG-16, and file the final return GSTR-10. If you leave it, nil-return late fees keep accruing and a REG-17 notice follows anyway.
• The return is already time-barred. Reconcile the period anyway and keep the working papers. If a notice under Section 73 or 74 arrives, that reconciliation is your defence. It may also be worth paying admitted tax voluntarily in DRC-03, which limits penalty exposure.
• Your registration has been cancelled and the revocation window has passed. The routes left are an appeal under Section 107 within its time limit, or in an appropriate case a writ petition. Applying for a fresh registration does not clear the old GSTIN's liabilities.
• The default was caused by the portal, a death, or an illness. Keep evidence (screenshots with timestamps, grievance ticket numbers, medical records). It does not waive the late fee automatically, but it supports an extension request and any reply to a show cause notice.

Most backlogs we see started with a quiet month, a nil return nobody filed. If you would rather not track the calendar yourself, our GST return filing service files every return on time, nil returns included.