EIM71308 | Tax treatment of working rule agreements: lodging allowances: definition of dependant
From HM Revenue & Customs · Employment Income Manual
The terms of the application form may vary slightly from one working rule agreement to another, but a common definition of dependants for these purposes is one of the following:
wife
husband
civil partner
child up to the age of 18 resident at the applicant’s permanent address and maintained by the applicant, irrespective of the child’s parentage
common-law wife or husband who has been maintained by the applicant at the permanent house address for a period of at least two years.
This definition of dependants has been agreed with the industry and should not be extended to include, for example, an operative’s parents.