IOUs are related to the rights and obligations of debtors and creditors. If the IOU is not standardized, it will easily lead to ambiguity, thus affecting the interests of the other party. So how do you write a formal IOU?

In the absence of other contracts, the IOU itself is a simplified contract, and the IOU is a legal document used to record the debtor's debts. Therefore, we should pay attention to whether the elements of the IOU are complete, including (but not limited to): the amount owed, the repayment time, the borrower's personal signature, and the establishment time of the IOU.

The following is a simple IOU template I collected for reference only:

Debtor: (full name of debtor) Creditor: (full name of creditor)

Debt amount: (debt amount) Debt reason: (debt reason) Repayment date: (repayment date)

The debtor confirms that the above information is correct and agrees to repay the debt before the repayment date.

Debtor: (debtor's signature) Date: (signature date)

Please note that this is only a basic template, and the actual IOU may need to be modified according to your specific situation and local laws and regulations. If you are not sure how to write an IOU, I suggest you consult a lawyer or a legal professional.