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IRS Forms: Every Guide, In One Place

The IRS runs on forms. These guides walk through the forms taxpayers actually encounter — what each one is for, how to fill it out, and the mistakes that cause delays.

The form follows the problem. Use Form 9465 to request a monthly installment plan if you cannot pay the full amount shown on your return or on an IRS notice. Use Form 656 to apply for an offer in compromise, with Form 433-A (OIC) or 433-B (OIC) for your finances. Use Form 2848 to authorize someone to represent you, or Form 1127 to ask for more time to pay because of undue hardship.

Updated August 17, 2026

Key takeaways

• Form 9465 is used to request a monthly installment plan if you cannot pay the full amount you owe shown on your tax return or on a notice the IRS sent you.
• Form 656-B is a booklet containing Form 656 plus Form 433-A (OIC) for wage earners and self-employed individuals and Form 433-B (OIC) for businesses.
• If you dispute that the tax is actually owed, the offer route is Form 656-L, which covers an offer in compromise based on doubt as to liability.
• Form 2848 authorizes an individual to represent you before the IRS, and that individual must be a person eligible to practice before the IRS.
• Forms 2848 and 8821 can be submitted to the IRS online, and Form 13844 is the application for a reduced user fee for installment agreements.

Which IRS form do I use if I cannot pay my tax bill in full?

Form 9465, Installment Agreement Request, is used to request a monthly installment plan if you cannot pay the full amount you owe shown on your tax return or on a notice the IRS sent you. The IRS also offers an Online Payment Agreement Application, so a paper Form 9465 is not the only route into a monthly plan.

Several related forms sit alongside it, depending on your situation:

• Form 1127, Application for Extension of Time for Payment of Tax Due to Undue Hardship, if you need more time to pay rather than a monthly plan.
• Form 2159, Payroll Deduction Agreement, where installment payments come out of wages.
• Form 13844, Application for Reduced User Fee for Installment Agreements.

The IRS lists Publication 594, The IRS Collection Process, and Publication 1660, Collection Appeal Rights, as useful companion reading, along with Publication 1, Your Rights as a Taxpayer. Reading those first helps you understand what collection action can continue while a request is pending and what appeal rights exist if a request is denied.

What forms make up an offer in compromise application?

Form 656 is used when applying for an offer in compromise (OIC), which the IRS describes as an agreement between you and the IRS that settles your tax liabilities for less than the full amount that you owe. Which package you download depends on the reason for the offer.

For an OIC based on doubt as to collectability or based on effective tax administration, you download Form 656-B, a booklet that includes instructions plus Form 656, Form 433-A (OIC), Collection Information Statement for Wage Earners and Self-Employed Individuals, and Form 433-B (OIC), Collection Information Statement for Businesses. For an OIC based on doubt as to liability, you download Form 656-L instead, which includes its own instructions.

The IRS instructs that complete financial statements on Form 433-A (OIC) or Form 433-B (OIC) and any required application fee and initial payment must be included with the Form 656. Before you file, the IRS offers a pre-qualifier tool to confirm your eligibility and prepare a preliminary proposal, and an Individual Online Account where you can determine your eligibility to file an OIC, file online, and make any required payments. There is also a separate request for appeal of an offer in compromise.

Which form lets a representative deal with the IRS for me?

Form 2848, Power of Attorney and Declaration of Representative, is used to authorize an individual to represent you before the IRS. The individual you authorize must be a person eligible to practice before the IRS. Your authorization of a qualifying representative also allows that individual to receive and inspect your confidential tax information.

There are some specific situations worth knowing. You may authorize a student who works in a qualified Low Income Taxpayer Clinic (LITC) or Student Tax Clinic Program (STCP) to represent you under a special appearance authorization issued by the Taxpayer Advocate Service. You can also file Form 2848 if the IRS begins a Foreign Bank and Financial Accounts (FBAR) examination as a result of an income tax examination.

If you only want someone to receive information rather than act for you, the IRS lists Form 8821, Tax Information Authorization, as a related third party authorization form, and Forms 2848 and 8821 can be submitted online. Publication 947, Practice Before the IRS and Power of Attorney, and Treasury Department Circular No. 230 set out the rules governing who may practice before the IRS.

Common IRS resolution forms and what each one does

What the IRS says

“Use Form 656 when applying for an offer in compromise (OIC), which is an agreement between you and the IRS that settles your tax liabilities for less than the full amount that you owe.”

— IRS, About Form 656, Offer in Compromise, IRS — About Form 656, Offer in Compromise https://www.irs.gov/forms-pubs/about-form-656

Frequently asked questions

Do I have to mail Form 9465 to ask for a payment plan?

Form 9465 is used to request a monthly installment plan if you cannot pay the full amount you owe shown on your tax return or on a notice the IRS sent you. The IRS also lists an Online Payment Agreement Application as an alternative. Related forms include Form 2159, Payroll Deduction Agreement, and Form 13844, Application for Reduced User Fee for Installment Agreements.

How can I check whether an offer in compromise fits my situation before filing?

The IRS offers a pre-qualifier tool to confirm your eligibility and prepare a preliminary proposal. Through an Individual Online Account you can determine your eligibility to file an offer in compromise, file it online, and make any required payments. The IRS also publishes detailed offer in compromise information covering fees and payment requirements, which is worth reading before you complete Form 656.

What is the difference between Form 2848 and Form 8821?

Form 2848, Power of Attorney and Declaration of Representative, authorizes an individual to represent you before the IRS, and that individual must be eligible to practice before the IRS. It also allows the representative to receive and inspect your confidential tax information. Form 8821 is titled Tax Information Authorization and is listed separately by the IRS. Both Forms 2848 and 8821 can be submitted online.

Which form do I use for tax records, an address change, or a fiduciary?

The IRS lists Form 4506-T, Request for Transcript of Tax Return, and Form 4506-T-EZ, Short Form Request for Individual Tax Return Transcript, for records. For an address change, it lists Form 8822, Change of Address, and Form 8822-B, Change of Address or Responsible Party for businesses. Form 56 is the Notice Concerning Fiduciary Relationship.

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