Self Assessment tax return forms

Most people file online, but you can use paper forms if you prefer.

Main forms

• SA100 — the main tax return
• SA103 — self-employment
• SA105 — UK property
• SA108 — capital gains, including cryptoassets
• SA109 — residence and remittance

Use the SA108 to report disposals of cryptoassets.

Deadlines for paper returns

Paper returns must reach HMRC by 31 October. See all deadlines.

Requesting forms

Contact HMRC to ask for forms by post, or use commercial software.