IRS Form 656-L — Offer in Compromise Based on Doubt as to Liability. This article explains in plain English how taxpayers may challenge an IRS tax bill they believe is incorrect, how Form 656-L differs from a standard Offer in Compromise, and when professional tax preparation assistance may help.

Have you received an IRS tax bill that you believe is wrong? Perhaps the IRS assessed additional taxes, you disagree with a tax determination, or you believe the amount shown on your account does not accurately reflect your legal tax obligation. Before paying a tax debt you believe is incorrect, it is important to understand your options.

IRS Form 656-L, Offer in Compromise Based on Doubt as to Liability, is a specialized form that may allow eligible taxpayers to ask the IRS to settle a tax liability when there is a legitimate dispute about whether the tax is owed or how much is owed. It is not intended for taxpayers who simply cannot afford to pay a tax bill. The IRS revised Form 656-L in July 2026, so taxpayers should review the latest instructions before applying.

For individuals and businesses in Grand Rapids, Kentwood, Wyoming, and throughout West Michigan, AIM Financial can help explain tax documents, review tax information, and identify questions to discuss with an appropriate tax professional.

What Is IRS Form 656-L?

Form 656-L is used to submit an Offer in Compromise based on doubt as to liability. In everyday language, this means you have a legitimate reason to believe the IRS has incorrectly determined that you owe a particular tax or that the amount assessed is wrong.

For example, you might dispute whether a particular tax adjustment is legally correct or whether a specific liability was properly assessed. Your claim must be supported by facts, applicable tax law, and documentation—not simply a disagreement with the IRS.

The form allows you to explain why you believe all or part of the tax debt is incorrect and propose an amount that reflects what you believe is the correct liability. Submitting the form does not guarantee that the IRS will accept your offer.

Who Might Need Form 656-L?

Form 656-L may be appropriate when a taxpayer has a genuine, supportable dispute about the existence or amount of an assessed tax liability and the IRS’s other procedures do not provide the appropriate resolution.

Before filing, however, it is important to identify exactly why the tax bill is being challenged. Different IRS problems require different forms or procedures.

Examples of situations that may require another approach include:

• You cannot afford to pay your tax bill. If you agree that you owe the tax but cannot pay the full amount, a standard Offer in Compromise, payment plan, or another collection option may be more appropriate.
• You made an error on your original tax return. You may need to file an amended return, such as Form 1040-X for an individual federal income tax return.
• You disagree with an IRS audit adjustment. Audit reconsideration or another applicable review procedure may be the proper next step.
• You disagree with a proposed adjustment for unreported income. If the IRS sent you a CP2000 notice, you generally need to respond through the process described in that notice.
• You believe an IRS penalty should be removed. Penalty relief or abatement may be more appropriate than Form 656-L.

The IRS provides a pre-qualifier assessment in the Form 656-L instructions to help taxpayers identify whether this is the correct procedure.

How to Complete IRS Form 656-L in Plain English

Completing Form 656-L requires careful attention to the instructions and the facts behind your tax dispute. Here is a general overview of the process.

1. Identify the tax liability

Determine which tax year, type of tax, and assessed amount you are challenging. Review IRS notices, account transcripts, previously filed returns, and other relevant records to understand how the balance arose.

2. Explain why the tax bill is incorrect

You must provide a written explanation identifying why you believe the tax liability is wrong. Be specific about the disputed issue. Explain the relevant facts and why the assessment does not accurately reflect your tax obligation.

A statement that the tax bill is unfair or unaffordable is not enough to establish doubt as to liability.

3. Gather supporting documentation

Include records that support your position. Depending on the circumstances, these might include tax returns, information statements, accounting records, correspondence, payment records, or other documents relevant to the disputed assessment.

If you cannot reconstruct certain records, the instructions allow you to provide an explanation supporting reasonable doubt about the tax debt. However, you should still present the strongest evidence reasonably available.

4. Determine an appropriate offer amount

The IRS instructions require an offer of at least $1. Your proposed amount should reflect what you believe the correct tax liability should be. If you believe you owe nothing, review the pre-qualifier instructions carefully before proceeding.

Unlike a standard Offer in Compromise based on inability to pay, Form 656-L does not require an application fee or an initial payment with the submission. Do not include a payment with Form 656-L.

5. Review eligibility and submission instructions

Read the current form instructions before submitting anything. Certain circumstances can prevent consideration of a doubt-as-to-liability offer, including an applicable final court decision or judgment. An open bankruptcy also generally prevents filing this type of offer.

The IRS may return a submission without considering it if required explanations or documentation are missing, or if another IRS review process involving the same issue needs to be completed first.

Form 656-L vs. Form 656: What Is the Difference?

Although both forms relate to Offers in Compromise, they serve different purposes.

Form	Main purpose
Form 656-L	Disputes whether a tax liability exists or whether the assessed amount is correct.
Form 656	Generally used when seeking an Offer in Compromise based on doubt as to collectibility or effective tax administration.

If you agree that you owe the IRS but cannot afford to pay, Form 656-L is generally not the correct form. If you believe the IRS has assessed the wrong tax, Form 656-L may be worth evaluating—but first confirm that another procedure is not required.

Why Professional Tax Guidance Matters

IRS collection notices and tax assessments can be confusing, particularly when multiple tax years or adjustments are involved. Choosing the wrong form or missing a required response can delay resolution and potentially affect your options.

A careful review can help identify the source of the tax debt, distinguish a genuine liability dispute from a payment hardship, organize supporting records, and determine which IRS procedure may apply. Taxpayers should also pay attention to any deadlines stated in IRS notices because submitting Form 656-L does not automatically resolve every pending issue or eliminate every deadline.

Contact AIM Financial for Tax Preparation Help in West Michigan

If you received an IRS tax bill you believe is incorrect, do not assume that Form 656-L is automatically the right solution. Start by understanding how the balance was calculated and which options are available for your situation.

AIM Financial helps individuals and businesses in Grand Rapids, Kentwood, Wyoming, and throughout West Michigan with tax preparation questions and tax-related documentation. Contact AIM Financial to discuss your tax preparation needs and determine what information may be helpful to review. For complex disputes, collection matters, or formal representation before the IRS, ask whether a qualified tax attorney, CPA, or enrolled agent with the appropriate experience should be involved.

Visit the official IRS website to obtain the current Form 656-L and instructions before preparing a submission.

AIM Financial — helping West Michigan taxpayers make informed decisions about their taxes.

This article is for general educational purposes only and is not legal, tax, or financial advice. Eligibility and the appropriate IRS procedure depend on the specific facts of each case. IRS forms, instructions, and procedures may change.