At a bare minimum, an IOU should include the borrower's name, the lender's name, the amount of the debt, the current date, the date the debt is due, and the borrower's signature. In addition, it's recommended that IOUs contain: How the debt is to be repaid (lump sum or installments)
Promissory notes are quite simple and can be prepared by anyone. They do not need to be prepared by a lawyer or be notarized. It isn't even particularly significant whether a promissory note is handwritten or typed and printed.
A simple promissory note might be for a lump sum repayment on a certain date. For example, let's say you lend your friend $1,000 and he agrees to repay you by December 1st. The full amount is due on that date, and there is no payment schedule involved.
Just like wills, there is generally no requirement that a contract be notarized in order to be legally binding. However, if a party who signed a business agreement decides to dispute that agreement in court, a notarized contract can help a great deal.
Write the contract in six steps Start with a contract template. Open with the basic information. Describe in detail what you have agreed to. Include a description of how the contract will be ended. Write into the contract which laws apply and how disputes will be resolved. Include space for signatures.