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The SA100 is the main document you need to fill when completing your Self Assessment tax return. There are two ways to complete your Self Assessment tax return: you can make an online submission, or download the form SA100 and make a paper submission.
The SA100 is the main document you need to fill when completing your Self Assessment tax return. There are two ways to complete your Self Assessment tax return: you can make an online submission, or download the form SA100 and make a paper submission.
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