It’s an employer’s responsibility to report any Benefits in Kind, sometimes known as ‘perks’, to HMRC each year. It’s not completely straight forward as the tax system doesn’t treat all benefits in the same way. Therefore it’s important to know what you should be declaring in advance.
National Insurance is often payable on the value of Benefits in Kind and so they must be reported annually as part of your employee’s gross earnings. The report must be made via a P11D form and is the Employer’s responsibility.