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SA1 Form-Registering for Self Assessment and getting a tax return

For people who need to complete a tax return for a reason other than self-employment. If you are a self-employed sole trader, please use our self-employed registration form instead. Fields marked * are required.

About you

Mr, Mrs, Miss, Ms, or other title

You need a National Insurance number to register for Self Assessment. If you do not have one, you can apply at gov.uk/apply-national-insurance-number. If you believe you do not need a UK National Insurance number, please tell us why below.

If lived at current address for less than 3 years
We need this to correspond with you and set up your registration.
The ten-digit reference in the top left-hand corner of page 1 of a previous tax return.

Why do you need to complete a tax return?

You must complete this section.

Tick every reason that applies to you *

Making Tax Digital (MTD) for Income Tax. If you have rental (or self-employment) income, you may need to use MTD for Income Tax: mandatory where combined income is over £50,000 from 6 April 2026, over £30,000 from April 2027, and over £20,000 from April 2028. If this may apply, please give an estimate below and we will advise you.

Gross (pre-expenses) — only if you have rental or self-employment income.

Agent authorisation

Do you authorise MCC Partners to register you for Self Assessment and act as your agent? *
We will send you a digital authorisation request to approve.

Your declaration

You must sign and date the declaration.

I declare that:

  • the information I have given on this form is complete and correct to the best of my knowledge and belief;
  • I will tell MCC Partners straight away if my circumstances or plans change in a way that affects the answers I have given.
Turnstile *