CWF1 - Registering for Self Assessment and National Insurance contributions if you are a self-employed sole trader
If you have a new business, you can use the HMRC tax registration service to register for Self Assessment, instead of downloading a form. It's quicker and easier. Follow the link below.
- Form URL
- CWF1 (PDF, 697KB)
Use form CWF1 to tell HMRC about your self-employment if you can’t register for business taxes online. Fill in the form, print and post it to HMRC. To register online follow the link above.
- Use form CWF1 to register for Self Assessment if you can't register for business taxes online. Complete the form on screen, then print and post it to HMRC.
64-8 - Authorising your agent
Use form 64-8 to authorise HMRC to communicate with your tax representative about your tax affairs
SA400 - Registering a partnership for Self Assessment
Use this form if you need to register a new partnership for Self Assessment
SA401 - Registering a partner for Self Assessment and Class 2 NICs
Use this form to register for Self Assessment if you've joined a partnership. It will help get your tax and National Insurance right from the start
SA402 - Registering a partner for Self Assessment if they're not an individual
Use this form if you need to register a partner for Self Assessment that isn't an individual, for example if a company or trust has joined a partnership
SA1 - Registering for Self Assessment and getting a tax return
Registering for Self Assessment
Help with PDF files
PDF is a file format that lets you view and print a document in a style which matches the look and feel of the paper version - including fonts, colours, images and layout.
To view these documents you need to use a PDF viewer such as Adobe Reader.
Forms in alternative formats
If you would like an HMRC form in large print, Braille or another alternative format, please contact the relevant HMRC helpline - see the link below.