When is the deadline for filing a Self Assessment tax return?
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The normal filing deadline for Self-Assessment Tax Returns is 31 January following the end of the relevant tax year.
Notices to File are typically issued by HMRC on the first working day after 5 April however, if a Notice to File is issued late, you typically have three months from the date of the Notice to file your Return.
Although not recommended, if you have to file a paper Tax Return, for example because your Tax Return is excluded from e-filing, the deadline is 31 October following the end of the relevant tax year.
To file a Self-Assessment Tax Return electronically, you need a Unique Taxpayer Reference (UTR) number. This is a 10-digit number linked to Self-Assessment Returns rather than your National Insurance number. If you do not have a UTR number, you should strictly apply for one by 6 October following the end of the relevant tax year.