All prepayments shall first be applied to outstanding late fees, then to accrued interest and thereafter to the principal loan amount. Here's the information you'll need to have handy to complete your secured promissory note, installment with balloon final payment.Payment Options for your Promissory Note: Structuring payment can have several options: • Lump Sum. A Promissory Note with Balloon Payments is a loan contract that enables a lender set loan terms with one or more larger payments at the end. The promissory note can be used for installment or balloon payments.