Sa370 form pdf 2026

1. Click ‘Get Form’ to open the SA370 form in the editor.
2. Begin by filling in your personal details, including your full name, address, and National Insurance number if known. Ensure you use black or blue ink and capital letters for clarity.
3. Identify the penalties you wish to appeal against. For each penalty, mark an 'X' in the corresponding box and enter the amount along with the date of the penalty notice as indicated on your notice.
4. In the designated area, provide a detailed explanation for your appeal. Include any relevant dates and supporting evidence that justifies your case.
5. Don’t forget to sign and date your appeal at the bottom of the form. If you're signing on behalf of someone else, indicate your capacity.
6. Once completed, send this form to the HMRC office specified on your penalty notice within 30 days.

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