Generally speaking, you can deduct from your turnover all costs which are wholly and exclusively for the purpose of carrying out your business.
Expenses you may be eligible to claim are:
1. Travel and accommodation
You can claim travel, accommodation and parking costs on business trips. You can also claim reasonably priced breakfast and evening meals on overnight business trips.
Also, you can add running costs of a business vehicle. This includes petrol, road tax, MOT, insurance, repairs and servicing. Additionally, the cost of buying a vehicle might qualify for capital allowances. Note, if you also use the car or van privately, you can claim only the proportion of vehicle’s expenses.