The SA1 is a form that individuals must use to register for Self Assessment with HMRC. It is not applicable to self-employed individuals, who use the CWF1.
The SA1 form is a document in the United Kingdom that allows individuals to register for Self Assessment with HMRC. It is not applicable for Self-employed individuals. Self-employed individuals must use a CWF1 instead.
This form applies to individuals that for example have a yearly income over £100,000, or to individuals that have sold assets that are liable to Capital Gains tax etc.
An example of this form is shown below:
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