Create financial agreements in minutes with our state of Illinois promissory note templates - designed for ease and customization. Use this free Promissory Note Template for Illinois when formalizing a loan agreement.It'll ensure legal compliance and protection for the Lender and Borrower. How Do You Fill Out an Illinois Note? These templates simplify the process, providing a structured format that covers all necessary details, from repayment terms to interest rates. Download a template here. Our user-friendly template helps you create a legal document for loan agreements, while providing peace of mind and clarity for both parties involved. Being polite can pay off in the end. • Ask for payment in writing. A promissory note is a contract that spells out the terms of a loan.