If you can't pay the full amount you owe, you can ask to make monthly installment payments. 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. Wondering if it's possible to set up an IRS installment payment plan to pay your taxes? Step 1: Complete the taxpayer information section.