For purposes of this part:
(a) “Person” means an individual, bank, corporation, partnership, limited liability company, society, association, organization, joint stock company, estate, or trust, or a receiver, trustee, assignee, referee or any other person acting in a fiduciary capacity, whether appointed by a court or otherwise, or any combination thereof.
(b) “Taxpayer” means any person subject to the tax imposed by this part.