Employees using company fuel for private journeys can sidestep a hefty benefit charge by repaying the full private fuel cost to their employer by 6 July 2025. Miss the deadline, and tax becomes unavoidable.

This repayment process is known as "making good," and requires the employee to repay the employer for private fuel no later than 6 July following the end of the tax year. For the 2024–25 tax year, the repayment must be completed by 6 July 2025.

If the repayment is not made by the deadline, the employee becomes liable for the car fuel benefit charge. This charge is calculated based on the vehicle’s CO2 emissions and the car fuel benefit multiplier. The charge applies regardless of the actual amount of private fuel used, making it potentially costly for employees who only use a small amount of fuel for private journeys, such as commuting.

To avoid the tax, the employee must fully repay the employer for all private fuel used during the year, including fuel used to travel to and from work. Accurate record-keeping is essential, as HMRC will only accept that no benefit has arisen if the full cost is repaid by the deadline. In many cases, repaying the private fuel cost can be more financially beneficial than paying the fuel benefit charge.