Two of the basic rules relating to employees’ expenses (including flat rate expenses) are that:
See generally
EIM31655.
Special Constables are volunteers, who usually receive no
pay for their police duties. It follows that they have no income
against which a FRE deduction can be given. In no circumstances
should a Special Constable be given a police officer’s FRE
allowance in the PAYE code for their full-time employment.
If, exceptionally, a Special Constable receives a bounty, or
some other form of remuneration for their police duties, the police
authority should apply PAYE to the payment(s) in the normal way. A
FRE allowance can then be given in the code for the Special
Constable’s police service employment.