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Assessments to income tax and capital gains tax are self assessments based on information shown in the return made under TMA 1970, ss 8 or 8A. See E1.210–E1.212. The assessment on a self-employed individual (including a partner) includes Class 2 and Class 4 national insurance contributions, which are treated as if they are income tax. Note, however, that from 6 April 2024 the requirement to pay Class 2 is removed, though voluntary payments could still apply. See E8.301. HMRC may require additional information in the self-assessment return, beyond that normally required for determination of the individual's tax liability¹. See E1.201A.

For any given tax year, there is only one self assessment in respect of a particular individual, regardless of the number or type of sources of income. The self assessment (ie the tax calculation) consists of two components²:

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   (a)ÌýÌýÌýÌý the total amount