I guess you could say it is "payable on request..." or you could say that the funds "belong to" the POD payee.
(5) "P.O.D. payee" means a person or charitable organization designated on a P.O.D. account as a person to whom the account is payable on request after the death of one or more persons.
...snip...
(7) "Request" means a proper request for withdrawal, or a check or order for payment, that complies with all conditions of the account, including special requirements concerning necessary signatures and regulations of the financial institution. If a financial institution conditions withdrawal or payment on advance notice, for purposes of this chapter a request for withdrawal or payment is treated as immediately effective and a notice of intent to withdraw is treated as a request for withdrawal.
Also:
Sec. 113.152. OWNERSHIP OF P.O.D. ACCOUNT ON DEATH OF PARTY. (a) If the account is a P.O.D. account and there is a written agreement signed by the original payee or payees, on the death of the original payee or on the death of the survivor of two or more original payees, any sums remaining on deposit belong to:
(1) the P.O.D. payee or payees if surviving; or
(2) the survivor of the P.O.D. payees if one or more P.O.D. payees die before the original payee.
(b) If two or more P.O.D. payees survive, no right of survivorship exists between the surviving P.O.D. payees unless the terms of the account or deposit agreement expressly provide for survivorship between those payees.
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