Glossary · UK Tax
Self Assessment
Self Assessment is the UK system for reporting income not taxed at source — including self-employment, rental, and foreign income — by filing an annual tax return with HMRC. The online deadline is 31 January following the tax year.
In more detail
UK taxpayers with income outside PAYE — the self-employed, landlords, higher earners, and those with foreign or investment income — report it through Self Assessment. The UK tax year runs 6 April to 5 April, and the online return and payment are due by the following 31 January. Americans in the UK often file both Self Assessment and a US return, coordinating the two via foreign tax credits.
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