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HMRC error messages · Income Tax

RULE_OVERLAPPING_PERIOD

Part of this update's dates is already covered by an update HMRC has accepted.

HMRC's message · HTTP 400
Period summary overlaps with any of the existing period summaries

When it appears

Sending a quarterly update for self-employment or property income.

What to check

  • The updates HMRC already holds for the business this year.
  • Whether the period type was changed after an update was sent.

How to fix it

Adjust the dates so the update covers only the days not yet reported, or amend the existing update instead.

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