No, you don't claim anything, it's like Vonhelmet said. You're the business, not an employee of a business claiming mileage allowances, so you put it through as an expense. Keep all your fuel receipts, servicing and insurance costs. Keep a tally of your business mileage and total mileage. You work out what your business mileage was as a percentage of your total mileage and that percentage of the total costs is what you put in as an expense. Example:What's the best way to work out the business mileage? Is it a simple case of keeping track of how many miles you do for work, and claiming 40p per mile as the cost to the business?
Fuel costs over the year = £1500
Insurance = £250
Servicing = £250
Total = £2000
Total miles covered = 10000
Business miles covered = 1290
Percentage business miles = 1290/10000 x 100 = 12.9%
So 12.9% of your total motoring was for the business so you put through 12.9% of your total motoring costs (£258) as expenses and you pay no income tax on that.
You can also put through a percentage of the depreciation in value of your car as an expense but I don't know how much of that you can put through legally. I had a pretty good idea what the depreciation would be, split it over the number of years I was planning to keep the bike for and put it in as an expense each year.
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