How to Post Tax Forms to HMRC (UK Guide)

HMRC prefers you to deal with it online, and most people file Self Assessment digitally. But some things still go by post: paper Self Assessment returns, certain appeals and claims, and supporting documents that can't be submitted online.

If that's you, here's how to get it to HMRC correctly and on time.

For Self Assessment, the deadline depends on how you file:

• Paper return: 31 October following the end of the tax year.
• Online return: 31 January following the end of the tax year.
• Paying what you owe: 31 January.

The paper deadline is three months earlier than the online one, so a paper return posted in, say, December is late — even though an online filer has until the end of January. Post paper returns with time to spare.

HMRC has moved much of its post to a central BX9 postcode, with the exact wording depending on what you're sending — for example, "Self Assessment, HM Revenue and Customs, BX9 1AS". Other services (PAYE, VAT, appeals) use different addresses.

There's no single address for everything, so always check the GOV.UK page for your specific form or letter — or the address printed on the form itself — before you post.

For anything with a deadline, a record of when you posted it can matter if there's ever a dispute. Keep your proof of posting until you know HMRC has received the document. PostPal emails a confirmation of posting for every letter.

With PostPal you can send it without a printer:

1. Upload your completed form, or write a covering letter online.
2. Attach any supporting documents (up to 5 files, no extra charge).
3. Enter the HMRC address from GOV.UK.
4. Pay £4 — printing, envelope, and Royal Mail postage included.

We post it the next business day and email you a confirmation.

Disclaimer: This guide is general information, not tax advice. Always confirm current deadlines and addresses on GOV.UK, and speak to an accountant if you're unsure. Post your tax documents →