42.— (1) Where 2 or more persons are liable persons in relation to a relevant residential property, one return in respect of the property shall be prepared and delivered by the liable person who is the designated liable person as determined in accordance with section 43.

(2) The making of a return referred to in subsection (1)—

(a) shall operate to satisfy the obligation of the other liable person, or liable persons, as the case may be, under this Part, and

(b) shall bind the other liable person, or liable persons.

(3) Where—

(a) more than one return is delivered in respect of a relevant residential property, and

(b) one of the returns is delivered by the designated liable person,

the Revenue Commissioners shall notify the person who is not the designated liable person that a return has been delivered by the designated liable person.

(4) Where—

(a) more than one return is prepared and delivered in respect of a relevant residential property, and

(b) there is no designated liable person in relation to the property,

the Revenue Commissioners shall designate a person to be the designated liable person and subsection (2) shall apply accordingly.