HMRC's message · HTTP 403
The VAT return was already submitted for the given period
When it appears
Submitting a VAT return.
What to check
- The VAT obligations for the client, which show the period as fulfilled.
- Whether the client or someone else submitted it.
How to fix it
Correct any error on the next return or with an error correction notification, as HMRC's rules allow.
Making Tax Digital in Accountin
Accountin shows HMRC's code and message next to a plain explanation, and keeps HMRC's reply against every submission.