1. IOUs established according to law have legal effect. IOUs generally need to specify the following contents:

(1) Legal full names of debtors and creditors;

(two) the specific time and reason of default;

(three) the amount owed, including the amount in words and figures;

(4) The specific time and payer of repayment;

(5) Finally, the debtor shall sign, seal or fingerprint.

2. Legal basis: According to Article 2 of the Provisions of the Supreme People's Court on Several Issues Concerning the Application of Laws in the Trial of Private Lending Cases.

When the lender brings a private lending lawsuit to the people's court, it shall provide debt vouchers such as IOUs, receipts and IOUs that can prove the existence of the legal relationship between lending and borrowing. If the creditor's rights certificate such as IOUs, receipts and IOUs held by the parties does not specify the creditor, and the party holding the creditor's rights certificate brings a private lending lawsuit, the people's court shall accept it. The defendant raised a factual defense against the plaintiff's creditor qualification, and the people's court ruled that the plaintiff did not have the creditor qualification after examination and dismissed the prosecution.

Second, how to write a formal loan is legally effective?

1. Name, ID number and address of the borrower. The borrower is an individual and must sign it himself. The legal effect of the iou signed by others will be controversial. For example, a loan signed by Zhang San and Li Si will bring legal trouble to the borrower.

2. Borrower's name: the full name is required, which is consistent with the ID card. It is best not to write code names such as Jason and Li Ge, so as not to encounter obstacles when claiming creditor's rights.

Write down the loan amount clearly: for example, how much is RMB? Write case separately, and the amount in words should be consistent, so as to avoid disputes caused by unclear handwriting and unclear amount.

4. Repayment period: The agreement on repayment period has advantages and disadvantages. Write down the repayment period clearly: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

5. Interest: for private loans, if there is an agreed interest rate, it shall be implemented as agreed by both parties; If there is no agreed interest rate, it is regarded as an interest-free loan. Before the creditor claims to repay the loan and pay interest, the people's court generally does not support the recovery of interest during this normal loan period.

6. Repayment method: whether to repay the principal and interest in one lump sum or in installments, and what period and how much, you need to write clearly.

7. Signature: the borrower signs, and the guarantor signs according to the index finger, and writes the complete date (year, month and day).