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SA400 - Registering a partnership for Self Assessment

The nominated partner can use the HMRC tax registration service to register for Self Assessment, instead of downloading the form. It's quicker and easier. Follow the link below.

Register your partnership for HMRC taxes

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Forms

Form URL
 SA400
Description

Use this form 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 complete the form on screen, print it, and post it to HM Revenue and Customs (HMRC).

If you have problems opening the form, find help by following the link below 'Get help viewing PDFs' or use this version of SA400. You'll have to print this version and fill it in by hand.

Use this form if you need to register a new partnership for Self Assessment

Related forms

64-8 - Authorising your agent
Use form 64-8 to authorise HMRC to communicate with your tax representative about your tax affairs
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
CWF1 - Self Assessment and National Insurance contributions - Registration and / or low earnings
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.
SA1 - Registering for Self Assessment and getting a tax return
Registering for Self Assessment

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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.

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