“ 62 Earnings (1) This section explains what is meant by “earnings” in the employment income Parts. (2) In those Parts “earnings”, in relation to an employment, means— (a) any salary, wages or fee, (b) any gratuity or other profit or incidental benefit of any kind obtained by the employee if it is money or money's worth, or (c) anything else that constitutes an emolument of the employment. (3) For the purposes of subsection (2) “money's worth” means something that is— (a) of direct monetary value to the employee, or (b) capable of being converted into money or something of direct monetary value to the employee. (4) Subsection (1) does not affect the operation of statutory provisions that provide for amounts to be treated as earnings (and see section 721(7)).”
“ 15 Earnings for year when employee resident, ordinarily resident and domiciled in UK (1) This section applies to general earnings for a tax year in which the employee is resident, ordinarily resident and domiciled in the United Kingdom. (2) The full amount of any general earnings within subsection (1) which are received in a tax year is an amount of “taxable earnings” from the employment in that year. (3) Subsection (2) applies— (a) whether the earnings are for that year or for some other tax year, and (b) whether or not the employment is held at the time when the earnings are received.”