If you offer your employees cash allowances, flexible benefit packages with a cash option or salary sacrifice in return for a Benefit in Kind (BiK), the rules for these types of BiKs changed on 6 April 2017.
All BiKs are now valued at the higher of the cash given up or the value under the traditional rules.
All previously non-taxable BiKs are now taxable, valued on the cash given up.
Cars with emissions of 75g CO2 /km or less, pensions, pension advice, childcare and Cycle to Work are unaffected.
Arrangements entered on or before 5 April 2017 kept their previous tax treatment until the earlier of a renewal or variation of the arrangement. Most pre-6 April 2017 BiKs moved into the new rules on 6 April 2018.