Do business cards have legal effect?

To be valid, the IOU needs to meet the following conditions: 1, and it must be something that can prove the fact of the debt. 2. It must be the expression of true meaning. 3. IOUs must be legally obtained. 4. Whether the IOU is valid or not depends on the court's approval and acceptance.

Legal basis:

"Several Opinions of the Supreme People's Court on People's Courts Handling Loan Cases" Article 2 When a lender files a lawsuit in a people's court, it shall provide creditor's rights certificates such as IOUs, receipts, IOUs and other evidence that can prove the existence of a legal relationship between loans and loans. 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. If the people's court considers that the plaintiff is not qualified as a creditor after trial, it shall rule to dismiss the prosecution.