Hi sam-ingle91-goog The self employed product is only a partial template of the self assessment form and enables you to account for allowable and disallowable expenses. The cost of purchasing a vehicle isn't an allowable expense and is accounted for in the actual self assessment form as Capital allowances boxes 40-59 if you use the SA103F and boxes 23-26 if you're using the SA103S. We must make you aware that we're not accountants and any information that we provide should be qualified by a professional.