{"id":1509,"date":"2025-10-15T13:36:48","date_gmt":"2025-10-15T13:36:48","guid":{"rendered":"https:\/\/www.simplybusiness.co.uk\/knowledge\/self-assessment\/self-assessment-deadline\/"},"modified":"2026-04-24T13:31:30","modified_gmt":"2026-04-24T13:31:30","slug":"self-assessment-deadline","status":"publish","type":"knowledge","link":"https:\/\/www.simplybusiness.co.uk\/knowledge\/self-assessment\/self-assessment-deadline\/","title":{"rendered":"Self Assessment deadline \u2013 key HMRC dates and filing guide"},"content":{"rendered":"\n

One of the most important dates to remember if you\u2019re self-employed or run your own business is the Self Assessment deadline. Your tax return shows your income and expenditure for the previous tax year and is how your tax bill is calculated.<\/p>\n\n\n\n

If you\u2019re a sole trader or in a business partnership, or if you\u2019re a company director, then you\u2019ll need to file a tax return to HMRC every year. Landlords earning money from renting out property<\/a> may also need to complete a Self Assessment, but we have a separate guide for that.<\/p>\n\n\n\n

When is the Self Assessment deadline?<\/h2>\n\n\n\n

The Self Assessment tax return deadline is on 31 January<\/strong> each year. This means that the deadline for filing your 2025-26 taxes is 11.59pm on 31 January 2027. This is also the deadline for paying any tax owed for the previous tax year (and your first instalment of payment on account<\/a>).<\/p>\n\n\n\n

Remember, this deadline is if you choose to file your taxes online \u2013 there\u2019s a different date to remember if you want to file a paper return. <\/p>\n\n\n\n

There are other important company and self-employed tax return dates too \u2013 keep reading and mark your diary with the key tax year dates to remember.<\/p>\n\n\n\n

Self Assessment tax \u2013 when to file?<\/h2>\n\n\n\n
Date<\/strong><\/td>Deadline<\/strong><\/td><\/tr>
6 April 2026<\/td>Start of 2026-27 tax year

From this date, Making Tax Digital<\/a> is replacing the annual Self Assessment process for those with an annual income of over \u00a350,000. In future, you\u2019ll need to file online every quarter<\/td><\/tr>
7 August 2026<\/td>Deadline to send your first quarterly update for Making Tax Digital<\/td><\/tr>
5 October 2026<\/td>Deadline to register for Self Assessment for income earned in 2025-26 tax year<\/td><\/tr>
31 October 2026<\/td>Paper Self Assessment tax return to be submitted for income earned in 2025-26 tax year<\/td><\/tr>
7 November 2026<\/td>Deadline to send your second quarterly update for Making Tax Digital<\/td><\/tr>
31 January 2027<\/td>Deadline for online Self Assessment tax return for income earned in 2025-26 tax year

Pay any remaining tax due for 2025-26 tax year, and first payment on account instalment<\/td><\/tr>
7 February 2027<\/td>Deadline to send your third quarterly update for Making Tax Digital<\/td><\/tr>
6 April 2027<\/td>Start of 2027-28 tax year<\/td><\/tr>
7 May 2027<\/td>Deadline to send your fourth quarterly update for Making Tax Digital<\/td><\/tr>
31 July 2027<\/td>Second payment on account instalment due<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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You\u2019ll no longer be able to file your Self Assessment tax return on paper from April 2026 with HMRC’s Making Tax Digital programme.  <\/p>\n<\/div>\n\n\n\n

Now you\u2019ve got the dates for your diary, make sure you follow the steps to filing your Self Assessment tax return<\/a>. And wondering how much tax you\u2019ll pay? Read our guide to income tax<\/a>.<\/p>\n\n\n\n

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Do I need to pay tax through Self Assessment? <\/strong><\/h2>\n\n\n\n

Yes, if you\u2019re:<\/p>\n\n\n\n