A guarantor agreement is an agreement of a third party to provide assurance of payment in the event the party involved in the transaction defaults. Sample guarantee agreement for individuals and businesses at 360 Legal Forms.Create, print, and share free with quick sign up. You can use this guarantor agreement form template as a base and start creating your own form in less than a minute. Get started right now! This page contains Guaranties clauses in business contracts and legal agreements. We have organized these clauses into groups of similarly worded clauses. A form of guarantee agreement is an agreement where a guarantor promises to fulfill the financial obligation of a borrower if they fail to pay.