Debt Acknowledgment - IOU

An IOU is usually an informal document acknowledging a debt. The term is derived from the phrases I owe unto and I owe you. An IOU differs from a promissory note in that an IOU is not a negotiable instrument as defined by the Uniform Commercial Code and generally does not specify repayment terms such as the time of repayment. IOUs usually specify the debtor, the amount owed, and sometimes the creditor.