GST return deadlines
Your GST return must be submitted by the end of the month following the last day of that GST period. Periods are generally three months long.
You must pay any GST owed when you submit your return.
Late return penalties
If you don't submit a GST return on time, you will pay a surcharge of £100.
You will additionally have to pay a surcharge of £100 for each month that the return continues to not be submitted, up to a maximum of 9 months.
You will also receive a default assessment which you will have to pay.
Late payment penalty
If GST isn't paid on time, you will pay a surcharge of 10% on the amount payable.
Suspending customs-approved trader status
It's a condition of Customs-approved trader status that you account for the value of goods you have imported in your GST return.
If you don't submit a return or pay the GST you owe, you will have breached the terms of your Customs-approved trader status.
Customs-approved trader status will be suspended if your business does not submit or pay the GST due.
If your Customs-approved trader status is suspended, all goods imported from that date will be detained at import. You will have to pay GST on your imports within three working days for the goods to be released.
This GST paid when you import goods is input tax and can be included in box 7 of your GST return for that period.
Appealing a GST decision