You can file IRS Form 9465 to set up an IRS installment agreement without an attorney. 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).In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS. To apply for this type of IRS payment plan, you'll need to fill out a IRS Form 9465 (Installment Agreement Request). You can also apply through the IRS. Need sample letter to the IRS on an offer in compromise Already Tried: fill out form 656 and, form 433 need the cover lt. If you owe these taxes, you may be required to fill out a collection information statement, depending on the type of installment request. ​An IRS Online Payment Agreement (OPA) can be requested online at the IRS website. How to Complete Form 9465?