Most GST penalties are not paid by people who tried to avoid tax. They are paid by people who lost track of a date.
The three filings that matter
GSTR-1 reports your outward supplies, meaning every invoice you raised. Monthly filers submit by the 11th of the following month. Businesses under the QRMP scheme file quarterly.
GSTR-3B is the summary return where the tax is actually paid. Monthly filers submit by the 20th.
GSTR-9 is the annual return, due 31 December for the previous financial year, and applies once turnover crosses the notified limit.
What late filing actually costs
Late fees run per day, per return, and they apply separately to CGST and SGST. On top of that, interest accrues on unpaid tax.
The bigger cost is quieter. Until you file GSTR-1, your customer cannot see your invoice in their GSTR-2B, which means they cannot claim input credit on it. They notice. Some of them hold your payment until it appears.
Why it goes wrong
It is almost never the filing itself. It is that invoices for the month were not all entered by the time the CA asked for the data. Someone was on leave, a paper bill never reached the desk, a number was written in a diary.
The businesses that never miss a date are not more disciplined at filing. They are the ones where the invoice gets recorded at the moment it is raised.
A calendar you can actually keep
- Last working day of the month: check every invoice raised is entered
- 5th: send the month to your CA
- 11th: GSTR-1 filed
- 20th: GSTR-3B filed and tax paid
Two of those four are yours, not your accountant's. They are also the two that decide whether the other two are easy.
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