Hi Kasia,
I can confirm that the SA100 on GOV.UK is available to download.
Although the form can be downloaded, we ask customers to call our dedicated order line on 0300 200 3610 to request a copy so we can offer them extra support to file online if they are able to.
Customers who live abroad and who want to file their tax return online can use commercial software.
The paper filing deadline is 31 October 2024. Customers who file online have until 31 January 2025.
Thanks