31 October 2023 is the self-assessment paper filing deadline for 2022/23 to avoid penalties. Readers are reminded that if an online self-assessment return cannot be filed by virtue of one of the online filing exclusions or special cases (search GOV.UK for details as these regularly change) meaning the return must be filed on paper instead, then in those cases, the 2022/23 paper filing deadline is extended to 31 January 2023. A reasonable excuse claim should accompany such returns.