A rebuttable presumption of survivorship
Under Utah Code § 75-6-104, sums remaining on deposit at the death of a party to a joint account belong to the surviving party or parties, as against the estate of the decedent, unless there's clear and convincing evidence of a different intention. This is a presumption that generally works in the survivor's favor by default, but it can be overcome with the right kind of evidence about what the deceased account holder actually intended.
How multiple survivors split it
If there are two or more surviving parties, their respective ownership shares during their lifetimes are in proportion to their previous ownership interests, augmented by an equal share of any interest the deceased party owned in the account immediately before death. The right of survivorship then continues between the remaining surviving parties — so if a third owner later dies too, the same basic mechanism applies again among whoever is left.
The bank can rely on its own records
A financial institution may rely on its own records for a joint account when distributing funds in accordance with the survivorship presumption. In practice, this means the bank doesn't need to independently investigate the deceased account holder's true intentions before paying a surviving owner — it can act on what its own account paperwork shows, which gives banks a clear, low-friction way to handle these payouts without becoming an arbiter of family disputes.
P.O.D. designations work differently from joint ownership
A payable-on-death (P.O.D.) beneficiary designation is a separate mechanism from joint ownership between co-owners. The named P.O.D. beneficiary has no rights to the account during the owner's lifetime — the owner keeps full control and can spend the money however they like. Only once the owner dies does the beneficiary become entitled to whatever remains, claimed directly from the bank without any probate court proceeding.
Real estate follows a related, but distinct, logic
The same basic survivorship concept — joint ownership passing automatically at death — extends to real estate under Utah's joint tenancy presumption, though real property follows its own statute with its own history of how broadly that presumption applies, rather than the bank-account-specific framework described here.
Life insurance and retirement accounts
Life insurance and retirement accounts like a 401(k) or IRA follow the same basic rule as P.O.D. bank accounts: the named beneficiary receives the asset directly, outside probate, as long as they're alive when the owner dies. Either one becomes part of the probate estate only if no beneficiary was ever named, every named beneficiary predeceased the owner with no contingent beneficiary in place, or the policy or plan names the owner's own estate.