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HMRC error messages · Income Tax

RULE_TAX_YEAR_NOT_ENDED

The action you asked for can only be done once the tax year is over.

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.

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Accountin shows HMRC's code and message next to a plain explanation, and keeps HMRC's reply against every submission.

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