| UPDATED: 08:04, Wed, Jan 27, 2021
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Self-assessment is undertaken by people who own a business or have a side income in the UK, and requires them to fill out tax returns. Most people have their taxes deducted automatically from wages, pensions and savings, and HMRC will evaluate and send over a bill for anything leftover. The upcoming self-assessment deadline applies to the previous financial year, which runs from April 6, 2019, to April 5, 2020.