No, a designated beneficiary cannot legally withdraw or access funds from a living account holder's bank account prior to their death unless they hold explicit legal authorization. Being named as a "payable-on-death" (POD) beneficiary or a nominee grants rights to claim remaining balances only after the account holder passes away and legal verification documents (such as a death certificate and succession papers) are processed by the institution. Prior to death, only the account holder or someone with documented Power of Attorney (POA) can manage the funds.