In very many cases, a person's employment income will consist wholly or mainly of general earnings (see EIM00510). General earnings are:
An employee or office holder who is resident, ordinarily
resident and domiciled in the United Kingdom is taxed on the full
amount of their general earnings for the tax year (Section 15 ITEPA
2003).
If you are dealing with an employee who is not resident, or
not ordinarily resident, or not domiciled in the United Kingdom you
will have to apply the special rules in Chapter 5 of Part 1 ITEPA
2003 (see
EIM40001 onwards).