Those owing more money will have three months to return it, once a self-assessment form has been issued.
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If you are a higher rate taxpayer you should declare the amount of the windfall on your self-assessment form.
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For each tax year everyone who submits a self-assessment form after October, will have to do so online or face penalties.
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But if they keep claiming it, then they will have to declare this in a self-assessment tax form.
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