Is such a white note in private lending protected by law?

Legal effect, protected by law.

In addition, in order to avoid disputes in the future, if the reasons for the arrears, the repayment date agreed by both parties, the corresponding liability for breach of contract, the identity information of the debtor, etc. There is a note on the IOU, and the content of the IOU will be more complete. At the same time, creditors should try their best to keep the corresponding documents that form arrears, so as to better protect their rights and interests.

1. The court will, in combination with other evidence, determine whether there is a loan relationship between "IOUs" or "receipts" with defects in form. At the same time, for cash-based loans, we can comprehensively judge whether the IOUs have legal effect and are protected by law according to the delivery voucher, payment ability, trading habits, loan amount, the relationship between the parties and the transaction details stated by the parties.

2. Legal basis: The provisions of the Notice of the Supreme People's Court on Properly Handling Private Lending Disputes to Promote Economic Development and Maintain Social Stability are introduced in detail, and it is recommended to consult.

In principle, IOUs (commonly known as IOUs) can be used as long as there is a specific amount owed and signed by the debtor himself.