IOUs also have legal effect. As long as you have the creditor's name, loan amount, debtor's name and loan date (although it was added later), it meets the main requirements of the loan, so it has legal effect. Once a dispute arises, it can be used as evidence to claim creditor's rights to the people's court, and the people's court will accept it. 1. When concluding a contract, the parties must have the corresponding ability to conclude a contract. 2. The intention of the parties to the contract is true. 3. The contract does not violate the law or public interest. IOUs have the nature of contracts. If the IOU is detailed and the parties are of normal intelligence, the legal effect of IOU is equivalent to the loan contract. If the IOU meets the following conditions, it has the same legal effect as the loan contract: 1, and the actor has corresponding capacity for civil conduct; 2. The meaning is true; 3, do not violate mandatory laws and administrative regulations, do not violate public order and good customs.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 667 A loan contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668 A loan contract shall be in written form, unless otherwise agreed between natural persons. The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 When concluding a loan contract, the borrower shall, at the request of the lender, provide the true information about the business activities and financial status related to the loan.

Derivative problem:

Can the transfer be recovered if it is cheated?

Whether it can be returned depends on the specific situation. If you find yourself cheated and transferred, you can take the following measures to recover the money.

1. When you find yourself cheated, you should immediately call the bank and temporarily freeze the liar's account. Tell the bank that this account is a liar's account. How much has this account just been transferred? Now we have called the police and need the bank to temporarily freeze this account. Therefore, banks will basically be temporarily frozen.

2. After the bank account is temporarily frozen, I need my ID card to go to the bank to unfreeze it. Under normal circumstances, scammers will not use their ID cards to handle bank cards, so there is a possibility that scammers can't move the money in their accounts. At this time, they can call the police and explain the situation when they call the police. If there are transfer records and QQ chat records, they can also print them out.