The content of an IOU for lending money to a couple is not much different from other IOUs. When filling in, you should also pay attention to the following matters: First, the full legal names of the borrower and the lender should be written clearly, and it is best to attach the ID numbers of both people. Second, the amount of the loan should be written clearly, including the amount in uppercase and lowercase letters. Third, the loan period should be clearly written, including the start, month and end dates of the loan and a clear loan period. Fourth, it should be written clearly that the interest on the loan should have a clear annual interest rate or monthly interest rate, and the total amount of interest on the loan that should be paid in the end should also include uppercase and lowercase amounts. Fifth, the year, month, day, time and method of repayment of the loan principal and interest should be clearly stated. Sixth, there should be a signature, fingerprint, or handwriting of the person borrowing the money. It should be noted that the signature should be signed by both husband and wife, so that it can be recognized as the joint debt of both husband and wife. , when one party does not repay the money, the other party can be found to repay it. Article 1089 of the Civil Code stipulates that upon divorce, the husband and wife's joint debts shall be repaid jointly. If the property of the same party is insufficient to repay the debt or the property belongs to each other, the two parties shall agree to repay the debt; if the agreement fails, the People's Court shall make a judgment.