You will need to register for Self Assessment with HM Revenue & Customs (HMRC) if you have to send a tax return but didn’t send one the previous year.
First-time Self Assessment registration
The deadline to register for Self Assessment for the first time is midnight on 5 October.
Self Assessment registration process time
You should note that it can take up to 20 working days to complete the registration process. You should take this into consideration to give yourself plenty of time to complete your Self Assessment return ahead of the 31 January deadline.
Watch this short HMRC video explaining how to register your new business online with HMRC so that you can complete a Self Assessment return.
HMRC also provides video guidance on how to register for Self Assessment if you are not self-employed.
