The basic contents of IOUs include: creditor's name, loan amount (local and foreign currency), interest calculation, repayment time, liquidated damages (deferred repayment), dispute resolution method, debtor's name, loan date and other elements. 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.