EIM11402 | Living accommodation: when a charge can arise under Part 3 Chapter 5 ITEPA 2003
From HM Revenue & Customs · Employment Income Manual
A charge to tax arises where living accommodation is provided by reason of the employment:
rent free, or
at a rent less than that paid by the person providing it, or
at a rent less than the amount chargeable under Section 103 ITEPA 2003.