Personal tax – form

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

Use form SA401 to register for Self Assessment if you've joined a partnership.

Documents

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

Registering a partner for Self Assessment and Class 2 NICs: PDF version (SA401)

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Detail

Use the SA401 to register as a partner for Self Assessment and Class 2 NICs.

You can fill in the form online, print it, and post it to HM Revenue and Customs (HMRC).

If you have problems opening the online form you can use the PDF version of SA401. You’ll have to print this version and fill it in by hand.

Before you start

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You’ll need to fill in the form fully before you can print it. You can’t save a partly completed form so we suggest you gather all your information together before you begin to fill it in.

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.