Petrol and diesel pump prices are high but the tax-free mileage rates payable to employees who use their own vehicles for business have not been adjusted for over a decade.

Many employees cannot afford to use their own car or motorbike for business journeys if they only get reimbursed at these rates so some employers choose to pay more. But any excess above the tax-free rate is taxable and subject to NIC.

The guidance from HMRC is confusing but the simplest way to deal with the excess mileage payments is to treat them as extra salary and put them through the payroll. This treatment should be communicated to the affected employees.

Where the employee's car is purely electric the employer can still pay up to the rates in the above table tax and NIC-free. Where the employee charges their private electric car at a charging point at work for free there is no taxable benefit on the electricity. Things get more complicated if the employer pays for the employee to charge their private electric car at the employee's home or a roadside charging point.