If you filed a self-assessment return on 4 January 2018 and have not had confirmation of submission, the advice from HMRC is not to re-submit, as HMRC are currently still processing these returns.

If you filled in a return on 4 January 2018 and were asked to save and resubmit this later you can now do so. If when you retrieve your saved return you receive the message ‘temporarily unavailable’ please clear cookies and cache, click back to stage 4 ‘Fill in your return’ and follow the instructions to complete the return.