How to submit your Self Assessment tax return to HMRC by post
A step-by-step guide to filing a paper Self Assessment return: the deadline, the address, what to attach, and how to post it to HMRC even if you're living outside the UK.
Most people file Self Assessment online, but plenty of taxpayers still submit a paper SA100 return - because they were sent a paper form, because they're completing supplementary pages that HMRC's own free online service doesn't support (such as the SA109 residence pages used by many non-UK residents), or simply because they prefer it. This guide walks through the process end to end: who needs to file on paper, the deadline you must hit, the exact address to use, and what to include so HMRC can match your return to your record without delay.