Help! My submission failed

So you've completed your tax return, and hit submit only to get an error message.

A couple of suggestions how to fix it.

If you got an authentication failure message, this is because your HMRC credentials haven't worked for some reason. Don't worry - we often hear that this happens even if people are confident they are using the right details.

Don't worry. We've got you. Simply ask us to enable untied express submit which lets you file without needing an HMRC login. To do this, email us two forms of ID – one with a photo and a different one with your address to

We also suggest that you double check your UTR.

You may also get an error that the untied calculation isn't agreeing with HMRC's data in which case please get in touch and we will look into it.

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