Because my relative's family changed a little, I wanted to borrow some money from my father, and the amount was a bit large, so I wrote an iou. I asked a friend who is a lawyer how to write it. This is the content and template he sent me.

IOUs generally consist of three parts: title, text and signature. In order to make the IOUs issued valid, the following principles should be followed when writing IOUs:

1, title. The title of IOU is generally composed of language names, that is, the word "IOU" is written in large font at the top and middle of the text. Some people write the words "temporarily owed" or "now owed" in this position as the title, but the text of this title is written in the top box of the next line.

2, the text. The subject of the IOU should write down what the person or unit owes, what it owes and how much it owes, and indicate the repayment date.

3. signature. Signature should be accompanied by the name of the owed unit and the personal signature of the handler, and the personal name of the owed party should be attached to the debit note issued by the individual. Meanwhile, the date of signing the debt. Units should build official seals and individuals should build private seals.

4. Indicate both parties and the date of establishment.

In short, the debtor's signature has legal effect as long as the reason and amount of the arrears are clearly written.

Template:

I borrowed xxx yuan because xxx was short of money recently.

It is expected to be returned as scheduled before xxx, xxx and xxx.

During the period, the monthly interest is RMB xxx only, which should be paid at the beginning of each month without error.

I'm afraid the above words are groundless, and I hereby give you an iou as proof.

Certificate lender: xxx ID number: xxx contact address: xxx phone: xxx certificate borrower: xxx ID number: xxx contact address: xxx phone: xxx witness: xxx ID number: xxx contact address: xxx phone: xxx guarantor: xxx ID number: xxx contact address: xxx phone: xxx.