Clearly and concisely record the key details of the loan agreement with the IOU template. You can include the names and contact details of both the lender and the borrower, the exact amount borrowed, and the date the money was lent, among other information. If there is a repayment plan, add the schedule, the installment amounts, any interest, the final due date for full repayment, and any actions that may be taken if the debt is not repaid. You should also include a section for both parties to sign and date the document. You can also include a witness signature to help avoid any future disputes about the content of the agreement.