Answer:
The answer here will depend very much upon state law, and not necessarily the UCC. Some states have separate laws on payments made in error and unjust enrichment.
I hasten to add that the same rules that require a customer to call banks' errors to the banks' attention when the errors are adverse to the customer require that customers contact the bank when the customer's account has too much money in it.
First published on BankersOnline.com 8/29/05