The following Owner-Managed Businesses guidance note by Tolley provides comprehensive and up to date tax information covering:
Sole traders or partnerships may use assets for both business and private purposes. For example, it is common for a sole trader to have a car which is used mainly for business, but at the weekends or in the evenings used for private purposes.
If all the costs of running the car are paid for by the business, the tax computations must be adjusted to take account of the private use. Therefore motor expenses in the profit and loss account are reduced for the private element of those costs.
Likewise when considering the capital allowance computations, the capital allowance must be reduced by the private element. The private element is normally given as a percentage which is then applied to the computations. In practice the private usage may need to be agreed with HMRC.
This is only applicable where the car is owned by the sole trader or partner. It is necessary to consider whether this is the case, or whether the car is in fact leased. See the Cars and long funding leases guidance note for further information.
Private use adjustments never apply to companies.
The director of the company might use a company car for his private purposes. However this will not affect the tax computations for the company. Instead:
For a sole trader or partnership, the private proportion of annual investment allowance (AIA), first year allowances (FYAs), writing down allowances (WDAs) or balancing adjustments must be removed from the computation, therefore all that remains is the business
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