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.Complete the enrollment process online at e-Services. If you can't pay the full amount you owe, you can ask to make monthly installment payments. Step 1: Complete the taxpayer information section. The IRS Online Payment Agreement system lets you apply and receive approval for a payment plan to pay off your balance over time.