Use Form 9465 to request a monthly installment plan if you cannot pay the full amount you owe shown on your tax return (or on a notice we sent you). Use Form 9465 to request a monthly installment agreement (payment plan) if you can't pay the full amount you owe shown on your tax return.To ask for an installment agreement, complete this form. Attach it to the front of your return when you file. This form kind of walks you through how you can apply for an online payment agreement without using form 9465. The IRS Online Payment Agreement system lets you apply and receive approval for a payment plan to pay off your balance over time. How do I request a refund? A. Fill out the Business Tax Refund Request form to request a refund from the City for an overpayment.