Commentary

A4.301 Introduction to self-assessment

Administration and compliance

A4.301 Introduction to self-assessment

Division A4.3     Assessments

For updates affecting this Division please see Part A0 Updates

Self-assessment

A4.301 Introduction to self-assessment

A system of self-assessment applies for income tax, capital gains tax and corporation tax. Under self-assessment individuals1 and companies2 are required to calculate their own tax liability as part of the tax return. Payment of self-assessed tax is automatic and HMRC do not issue their own tax assessments in these circumstances (see A4.305, A4.310).

If a taxpayer fails to file a self-assessment return, HMRC may make a determination of the liability (see A4.607, E1.203)3. A determination is not an assessment and is not subject

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