HMRC's message · HTTP 400
The specified tax year has not yet ended
When it appears
Triggering a year-end calculation, or disapplying or withdrawing the late accounting date rule.
What to check
- The tax year selected.
- Whether you meant an in-year calculation.
How to fix it
Wait until after 5 April, or use an in-year calculation instead.
Making Tax Digital in Accountin
Accountin will send VAT returns and income tax updates to HMRC once HMRC grants it live access. It then shows HMRC's code and message next to a plain explanation, and keeps HMRC's reply against every submission.