EIM43526 - Globally mobile employees: PAYE: overview
Generally, when an employer makes a payment of employment income to an employee on which the employee is liable to UK tax, the employer is required to operate PAYE on this payment in accordance with the PAYE Regulations.
Where the employer is based in the UK, and the employment
income relates to a tax year for which the employee is UK resident and performs
all of their employment duties in the UK, the operation of PAYE is relatively
straight forward.
However, where the employer is based outside the UK, or the employee is globally mobile, this can affect the operation of PAYE.