A loan agreement is a legal document between a creditor who lends money to a borrower that is repaid with interest. This program will help you write a letter that formally requests the money you are owed.This is called a Demand Letter. This free sample demand letter to pay is for a personal loan to an exroommate. Remember, this is only an example of a demand to pay. Are you looking for a loan agreement form in California? Download our free California Loan Agreement Form which is available as PDF or Word documents. Have you recently settled a debt and are searching for a paid in full letter? Good news, we've got two free sample form letters below.