A benefit provided in respect of the employment of an employee of an employer is an exempt benefit if:
(a) the employer is an organisation that, but for subsections 66(2) and (3), would be exempt from a liability to pay tax in respect of the benefit by virtue of the operation of the International Organisations (Privileges and Immunities) Act 1963 ; or
(b) the employer is an organisation established by an agreement to which Australia is a party and which obliges Australia to grant the employer an exemption from a liability to pay tax in respect of the benefit.