Sa103s 2026

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Click ‘Get Form’ to open the sa103s in the editor.
Begin by entering your name and Unique Taxpayer Reference (UTR) in the designated fields at the top of the form.
In the 'Business details' section, provide a description of your business and its postcode. If there have been any changes in the last 12 months, mark the box and include details in the 'Any other information' section.
Fill in the start date of your business if it began after 5 April 2015, and enter the final trading date if applicable.
Indicate whether you used cash basis accounting by marking the appropriate box. Complete income fields by entering your turnover and any additional business income.
List allowable business expenses in their respective sections, or simply enter total expenses in box 20 if your turnover was below £82,000.
Calculate your net profit or loss based on provided formulas and fill out capital allowances as necessary.

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