Use the online forms service or postal forms to register a new partnership for Self Assessment.
PDF, 161KB, 2 pages
Use the SA400 to register a new partnership for Self Assessment. The partner nominated by the partnership to receive and submit partnership returns must sign the form.
You can register by:
To register using the online service, you’ll need to have your Unique Taxpayer Reference (UTR) number or VAT reference number added to your Business Tax Account.
You can add the UTR or VAT reference number from the homepage of your Business Tax Account.
If you use the online service to register, you’ll get a reference number to track the progress of your registration.
If you have problems opening the online forms you can use the PDF version. You’ll have to print this and fill it in by hand before posting it to HMRC.
If you’re using an older browser, for example, Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.
64-8: Authorising your agent
Use form 64-8 to authorise HMRC to communicate with an accountant, tax agent or adviser acting on your behalf.
Don’t include personal or financial information like your National Insurance number or credit card details.