The IOU must state: creditor’s name (ID card number), loan amount (domestic and foreign currency), interest calculation, repayment time, penalty for breach of contract (delayed repayment), dispute resolution method, debtor’s name, loan amount Date etc.

Extended information:

An IOU is a written certificate indicating the relationship between creditor and debt. It is usually written and signed by the debtor, indicating that the debtor has owed the creditor the amount specified in the IOU. An IOU refers to a note written to the other party when borrowing cash or items from an individual or a public person. It is an IOU.

After the money and items are returned, the note maker will take the note back and invalidate or tear it up. It is a certifying document. Usually used in daily life and business management.

From a legal perspective, an IOU is a written document indicating the relationship between a creditor and a debtor. It is usually written and signed by the debtor, indicating that the debtor has owed the creditor the amount specified in the IOU.

Reference: Baidu Encyclopedia-IOU