How and when to register with HM Revenue & Customs (HMRC)

It's important to let HMRC know that you're self-employed as soon as possible - even if you already fill in a Self Assessment tax return each year. If you don't tell them, you may have to pay a penalty.

You can let HMRC know about your self-employment by completing the Self Assessment registration forms. HMRC will use the information to set up the right National Insurance records for you too.