4.—(1) This paragraph applies to income from an employment.
(2) The amount to be taken into account as income to which this paragraph applies is the qualifying person’s current annual pay, namely his current pay expressed as an annual amount or, where that amount does not fairly represent his current annual pay, such amount as does.
(3) In this paragraph—
“employment” includes a part-time employment and an office but does not include a casual or temporary employment; and
“pay” includes any commission, bonus, allowance (but not an expense allowance), tip, gratuity or other payment made to the qualifying person in connection with his employment but does not include any benefit in kind; and references to pay are references to it before any statutory or other deduction has been made.