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A personal tax return is a form that you as a taxpayer sometimes have to submit to HMRC to declare your income and how much tax you should pay (or sometimes get back from HMRC as a tax refund).
If you need to file one, you need to do it before January 31st of the year following the tax year in which you earned that income. The UK tax year goes from April 6th to April 5th. For example, if you were self-employed between April 6th 2018 to April 5th 2019, you have until January 31st 2020 to file a tax return.
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