How to fill in a self-assessment tax return - Which? - Which co uk 2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin by entering the Self Assessment tax reference at the top of the form. This is crucial for identifying your registered pension scheme.
3. Fill in the pension scheme name and correspondence address completely. Ensure accuracy to avoid any delays.
4. If applicable, indicate whether you want HMRC to calculate your tax by checking the appropriate box and providing necessary dates.
5. Proceed to report income types as instructed on pages 2 and 3, ensuring you round figures correctly and include all relevant income sources.
6. Complete sections regarding trading income, Deed of Covenant income, and any other taxable income as required, marking 'Yes' or 'No' where indicated.
7. Finally, review your entries for accuracy before signing and dating the declaration at the end of the form.

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