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.Sample letters from the Department of Revenue, sent to businesses or taxpayers who wish to enter into a payment agreement for back taxes. The IRS Online Payment Agreement system lets you apply and receive approval for a payment plan to pay off your balance over time. An IRS payment plan is an agreement you make with the agency to pay your federal tax bill over time. Use Form 9465 to request a monthly installment plan if you can't pay the full amount you owe shown on your tax return (or on a notice we sent you). You can file IRS Form 9465 to set up an IRS installment agreement without an attorney. Fill out form 656 and, form 433 need the cover lt given details, etc. ​An IRS Online Payment Agreement (OPA) can be requested online at the IRS website. How to Complete Form 9465?