Tax Deadlines
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UK tax deadlines
Self-assessment, corporation tax, payments on account, and the tax-year calendar with the rules behind each date.
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Self Assessment key dates: the complete UK tax-year calendar
For UK Self Assessment, the four key dates each tax year are: 5 October (register if first-time), 31 October (paper filing deadline), 31 January (online filing AND balancing payment AND first payment on account), and 31 July (second payment on account). Miss the 31 January and the £100 penalty applies immediately regardless of whether tax is owed.
UK Corporation Tax payment deadlines
UK Corporation Tax is paid 9 months and 1 day after the company's accounting period ends — earlier than the filing deadline of 12 months. Large companies (taxable profits over £1.5m) pay in quarterly instalments starting 6 months and 14 days into the accounting period. Missing the payment date triggers interest at the HMRC rate plus penalties.
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