Only the borrower's signature is valid on the receipt. How to write an effective IOU: First, IOU must have the basic information of the debtor; Secondly, the contents of the IOU should include terms such as type, currency, purpose, amount, interest rate, term and repayment method; The last iou should be accompanied by the debtor's signature and date.

Legal objectivity:

202 1, 1, 1 Article 667 of the Civil Code, which came into effect, is a loan 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.