the correct way is to keep a note of biz and personal miles. At the end of your
first year of trading, calculate your biz miles as a % of total miles. In subsequent years, providing you don't dispose of the car in question, you continue to use the biz %.
If you get a new car, you have to keep a note of biz and personal all over again,
If you go the 40pence per mile route, you still need to keep a note of milage in first yr to asertain biz miles
Ps, I have a degree in accounting and investment so know what I'm talking about
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