What levels of tax-free mileage rates are approved by the Inland Revenue for employees using their own cars for business use?

For the first 10,000 miles a tax year you can be reimbursed up to 40p a mile without having to pay tax. Over 10,000 miles this comes down to 25p a mile.

For motorcycles you can be reimbursed 24p a mile tax free, however many miles you do and for cycles the figure is 20p.