Liability of officers under the Associations Incorporation Act (1987) (WA):

Section 12 of the current WA Associations Incorporation Act mentions liability of officers, trustees and members.
"(1) An officer, trustee or a member of an incorporated association is not by reason only of his being such an officer, trustee or member liable in respect of the liabilities of the association." There are no residual liabilities carried by board members except those incurred before its incorporation. This is quite different from a company, which falls under the Corporations Act.

Liabilities relate to contracts that it enters into and criminal acts, and the possibility of negligence.

Management committee members personally have to fulfill the functions of their office to the best of their ability, act in good faith, comply with the rules of the association, operate within authorized decisions, and exercise general duty of care. They can be personally liable if they don't.

In fact, the main reason that people incorporate is to avoid being in the situation of an unincorporated association where each member is personally responsible for anything.