When you loan money to someone the best thing to do is to formalize the terms of your agreement with a legal agreement form. Promissory notes are legally binding documents that obligate borrowers to repay their debts.  Without a written and signed Promissory Note, it will be difficult to make sure repayment occurs if the borrower doesn't honor the terms of your legal agreement form.  The best way to create a Promissory Note is to use a template or an online service which will provide you a legal agreement form.  A Promissory Note legal form may be found on RocketLawyer.com, which can be tried for free. The legal agreement form is easy and quick to fill out and will help protect your interests as a lender. RocketLawyer.com has a general Promissory Note,Due on Demand, Due on Specific Date, Installment Plan and Balloon Payment.  Rocket Lawyer also has many different types of sample legal agreements to explore. Take a look!