I am advised by Revenue that information regarding the purchase and or leasing of electric vehicles by employers, which are subsequently made available to their employees for private usage, along with the mileage used for both business and private usage is not provided on a tax return. In addition, employers are not required to provide a detailed breakdown of each of their employees’ BIK tax liabilities on their tax returns. As this information would be required to make the necessary calculation, it is not possible to estimate the saving to the Exchequer from the proposed change.