Why am I seeing a TAX_PERIOD_NOT_ENDED error when I try to submit a VAT return?

The TAX_PERIOD_NOT_ENDED error can appear because you selected an open obligation in Easy MTD VAT that is associated with a VAT period that has not yet ended. For example, if your VAT period is January, February, March, you cannot submit the associated VAT return until April.

To resolve this, please wait until after the associated VAT period has ended then try again. There may be another open obligation in Easy MTD VAT so check whether you should be submitting a VAT return for that one instead.

If you are certain the open obligation you are trying to submit a VAT return for is associated with a VAT period that has ended, you will need to contact HMRC to resolve the issue.