Oregon Revised Statutes Credit Unions, Lending Institutions and Pawnbrokers § 723.478

(1) A joint account belongs, during the lifetime of all parties, to the parties in proportion to the net contributions by each party to the sums on deposit, unless there is clear and convincing evidence of a different intent.

(2) A P.O.D. account belongs to the original party during the lifetime of the party and not to the P.O.D. payee or payees. If two or more persons are named as original parties, during their lifetimes, rights between them are governed by subsection (1) of this section.

(3) Unless a contrary intent is manifested by the terms of the account or the deposit agreement, or there is other clear and convincing evidence of an irrevocable trust, a trust account belongs beneficially to the trustee during the lifetime of the trustee. If two or more parties are named as trustees of the account, during their lifetimes, beneficial rights between them are governed by subsection (1) of this section. If there is an irrevocable trust, the account belongs beneficially to the beneficiary.