HMRC's message · HTTP 400
More recent submissions exist. Trigger a new calculation
When it appears
Submitting a final declaration.
What to check
- Updates or adjustments sent since the calculation.
How to fix it
Trigger a new final calculation and declare that one.
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.