What Happens If GST Return Is Not Filed: The Cost, Stage by Stage

If you do not file a GST return, the cost builds in stages. A late fee starts the next day, interest runs on unpaid tax, and your next return gets blocked. Keep going and the officer can estimate your tax, e-way bills can stop, and after six months the registration itself can be cancelled.

Do you have to file even with no sales?

Yes. The GST portal's own manuals say GSTR-1 must be filed even when there was no business in the period, and GSTR-3B is mandatory for every normal taxpayer. Skipping it sets off the same chain as skipping a month with sales.

What happens, and when?

How much is the late fee and interest?

The law sets Rs 100 a day under each of the central and State Acts, but notifications have waived most of it. What you actually pay is Rs 25 a day under each Act, so Rs 50 a day in total, and Rs 20 a day for a nil return. From June 2021 the fee for one return also stops at a cap: Rs 500 for a nil return, Rs 2,000 if your turnover is up to Rs 1.5 crore, Rs 5,000 up to Rs 5 crore. The full working is in GST late fee for GSTR-1 and GSTR-3B.

The fee is per return. Twelve missed months means twelve fees for GSTR-3B, and the same again can apply for GSTR-1.

What is a best judgment assessment?

Ignore the GSTR-3A notice and the officer does not need your figures any more. Section 62 lets the officer work out your tax from whatever is on record: your earlier returns, e-way bills, the sales your marketplace reported. The estimate is rarely in your favour.

There is a way out. If you file the pending return within 60 days of that order, the order is treated as withdrawn. A further 60 days is allowed with an extra fee of Rs 100 a day under each Act. These limits apply from 1 October 2023. Before that it was 30 days, and many pages still say so. Late fee and interest remain payable either way.

When can the registration be cancelled?

Rule 21 of the CGST Rules was rewritten from 1 November 2026 by Notification 05/2026-Central Tax. The return related grounds are the same as before:

• a monthly filer who has not filed for a continuous period of six months;
• a quarterly filer who has not filed for two tax periods in a row;
• a composition dealer whose annual return is more than three months late.

Today the officer issues a show cause notice in Form REG-17, your GSTIN shows as Suspended, and you get seven working days to reply. File the pending returns at this point and the matter usually ends there.

From 1 April 2027 this gets faster. As we read the same notification, the portal itself will suspend the registration and send an intimation in Form REG-31. You then have 30 days to file everything. Do that and the suspension lifts by itself. Miss it and the registration is treated as cancelled by the system. You can still apply to bring it back within 180 days. A cancelled GSTIN means no tax invoices, and marketplaces do not let you sell taxable goods without an active GSTIN. The way back is in revocation of cancelled GST registration.

A worked example

Kavita sells home decor online. Her turnover last year was Rs 60 lakh and she files monthly. She pays about Rs 12,000 of GST in cash each month. She files nothing for April to September 2026, then files all six months on 20 November 2026.

• GSTR-3B late fee: April to August are each past the 40 days at which the Rs 2,000 cap is reached, so Rs 10,000. September, due 20 October, is 31 days late: Rs 1,550. Total Rs 11,550.
• GSTR-1 late fee: all six are 40 days late or more, so up to Rs 12,000.
• Interest at 18%: the six payments are late by 184, 153, 123, 92, 61 and 31 days. On Rs 12,000 each, that is about Rs 3,811.

Being late costs her up to Rs 27,361 on Rs 72,000 of tax. And by 20 October she had six unfiled months in a row, so her registration was already liable to cancellation.

The mistake sellers usually make

They wait until they have the money to pay the tax. The two forms do different jobs. GSTR-1 only reports your sales, and filing it costs nothing. The second mistake is treating the GSTR-3A notice as routine mail. It is the last step before the officer estimates your tax. The third is filing only the latest month. The portal takes returns in order, so start with the oldest.

What should you do today?

1. Log in to the GST portal and open the returns dashboard. List every period that shows as not filed.
2. File the oldest GSTR-1 first, then that period's GSTR-3B, and move forward month by month.
3. Pay tax, interest and late fee in cash as the portal shows them. Check Table 5.1 of the next GSTR-3B for late fee carried forward.
4. If you have a notice or an ASMT-13 order, count the days from its date and file inside the window.
5. If the registration is already cancelled, file the returns and apply for revocation.

One or two missed months you can clear yourself. With a notice, an assessment order or a suspended GSTIN, the replies have deadlines and it is worth paying someone who does this daily.

Frequently asked questions

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