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. 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).Applying online has the lowest application fees. On Form 9465, the IRS offers alternative payment options. Some of these options that you may qualify for are: â—‹ 120 day extension to pay, and. If you owe back taxes, you may be able to set up an IRS installment agreement. This IRS Form 9465 tutorial shows you how to do so! If you can't pay the full amount you owe, you can ask to make monthly installment payments. Please mail your completed form, along with any attachments, and your first installment payment to the Revenue Officer whose address was provided with the. The 9465 form is rather short and only requires your personal information, the name and addresses of your bank and employer, the amount of tax you owe.