A mortgage in principle (MIP) is a document providing an indication of how much you could borrow to buy a property. This agreement helps both parties understand their potential loan amount, creating a solid foundation for the mortgage application process.An Agreement in Principle will give you an estimate of how much you can borrow with a mortgage. Read our guide to what you need to know. Instructions for fill-in form: To complete a fill-in form, tab between the gray boxes inserting the requested information in each. 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. As Peoria's premiere property management company, we pride ourselves on connecting quality tenants with quality homes. Create, commit to, and manage your agreements all in one platform with Docusign IAM. Electronically sign for free.