29/10/2026
If you complete Self Assessment on paper, HMRC must receive the 2025/26 return by 11:59pm on 31 October 2026, unless a different deadline applies to your notice š®š»
Posting it on deadline day is not the same as HMRC receiving it on time.
If the paper deadline is no longer realistic, check the official online-filing guidance promptly. The standard online deadline is 31 January 2027, although individual circumstances can affect what is required.
Avoid a Halloween paperwork scare: check your deadline on GOV.UK or speak to a qualified tax professional.
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