Form

Self Assessment: Register a partner for Self Assessment and Class 2 NICs (SA401)

Use the online forms service or the postal form to register for Self Assessment if you've joined a partnership.

Published 30 April 2014
Last updated 6 April 2016 — see all updates
From:
HM Revenue & Customs

Documents

Online form service

https://www.tax.service.gov.uk/forms/form/register-a-partner-or-a-partnership-for-self-assessment/new

Print and post form (SA401)

Ref: SA401 https://public-online.hmrc.gov.uk/lc/content/xfaforms/profiles/forms.html?contentRoot=repository:///Applications/SA_iForms/1.0/SA401_20167&template=SA401_en_1.0.xdp

Print and fill in by hand (PDF version)

Ref: SA401 PDF, 143KB, 2 pages

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email different.format@hmrc.gsi.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Details

Use the SA401 to register as a partner for Self Assessment and Class 2 National Insurance contributions.

To register you can:

  • use the online service (you’ll need to log in to your tax account)
  • fill in form on-screen, print and post to HM Revenue and Customs

You should fill in the form fully before you print it as you can’t save a partly completed form so you should gather all your information together before you start to fill it in.

If you’ve 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.

Before you start

If you’re using an older browser, eg Internet Explorer 8, you’ll need to update it or use a different browser. Find out more about browsers.

Tax agents and advisers: authorising your agent (64-8)
Use form 64-8 to authorise HMRC to communicate with an accountant, tax agent or adviser acting on your behalf.

Published 30 April 2014
Last updated 6 April 2016 + show all updates
  1. Rates, allowances and duties have been updated for the tax year 2016 to 2017.
  2. An online service is now available.
  3. Added translation

Related content