A payment plan agreement outlines an installment plan to repay an outstanding balance over a specified time frame. 6.2 Monthly Invoicing and Payments.You may request the court consider your ability to pay in reducing the amount owed, setting a payment plan, or consider community service in lieu of payment. This document is a cellphone payment plan agreement between a debtor and creditor. To fill out the Installment Agreement Request form, first gather your financial information including tax liabilities.