Challenging the Underlying Tax Liability in CDP Hearings

You can challenge the underlying tax liability in a CDP hearing only when the IRS never sent you a statutory notice of deficiency for the tax at issue and you had no other prior opportunity to contest the amount.¹ When those two conditions are met, the Collection Due Process hearing is one of the few places in the collection pipeline where the tax debt itself, not just how the IRS collects it, can be reduced or eliminated.

Who Qualifies to Dispute the Amount

Two conditions govern eligibility. First, the IRS must not have sent you a statutory notice of deficiency, sometimes called a 90-day letter, for the tax periods you want to fight. Second, you must not have had any other chance to contest the liability.¹ A notice of deficiency is the formal letter the IRS sends before assessing additional income, estate, or gift tax. It gives you 90 days, or 150 days if mailed outside the United States, to petition the Tax Court without paying first. If you got that letter and did not respond, you have used your opportunity. The CDP hearing is not a second chance for taxpayers who let earlier deadlines pass.

The bar reaches further than just deficiency notices. You are also blocked from raising a liability issue at the CDP hearing if that same issue was raised and considered in a prior CDP hearing, in an earlier administrative appeal, or in any court proceeding where you participated meaningfully.¹ Meaningful participation does not mean you won or even that you appeared in person. If you had the chance to present evidence or argument and chose not to, that counts.

For some taxes, there is no deficiency-notice procedure at all. Employment taxes, trust fund recovery penalties, and certain penalty assessments are assessed without one, which makes the CDP hearing the first and often only administrative forum where the amount can be contested. Business owners who received a Letter 1153 assessing a trust fund recovery penalty and did not file a formal protest within the 60-day window may find the CDP hearing is their remaining shot.

The Last Known Address Problem

Some taxpayers lose eligibility without ever seeing the deficiency notice that took it away. The IRS only has to mail the notice to your last known address, defined as the address on your most recently filed and properly processed return.² Move without updating the IRS, and the notice can be delivered to an address you no longer occupy. You never receive it. The IRS has still legally satisfied its obligation, and you are treated as having had a prior opportunity to dispute.

The IRS does cross-reference the USPS National Change of Address database, but the match depends on your name and old address lining up exactly with IRS records.² A name change or a formatting difference can break the update. Filing a return with your current address, or sending Form 8822 directly, is the reliable way to keep the record straight.

Filing Form 12153 Within 30 Days

You request the hearing on Form 12153, Request for a Collection Due Process or Equivalent Hearing, sent to the address on the collection notice you received.³ Identify the exact tax periods in dispute. If the notice covers the fourth quarter of 2023, do not write “2023.” That kind of shorthand can delay or derail the request.

The deadline is 30 days, but the counting differs by notice type. For a levy notice, the 30 days begin the day after the date printed on the CDP notice.⁴ For a lien, the IRS has five business days after filing the lien to send you the notice, and your 30 days begin the day after that five-day period ends.⁵ Find the date on the upper portion of the notice and count forward carefully.

Form 12153 has a section called Basis for Hearing Request. Checking a box will not do the work. Write a specific statement of what went wrong: income counted twice, a credit disallowed, payments not reflected on your account. Include the dollar figure you believe is correct. This gives the appeals officer a roadmap and prevents the challenge from being dismissed as vague or frivolous.

If you mail the form near the deadline, the postmark date controls under the timely mailed, timely filed rule, provided the envelope was properly addressed with sufficient postage.⁶ Certified or registered mail goes further: the certification date is treated as the postmark, and the receipt proves you mailed it. Some designated private delivery services qualify, but not every FedEx or UPS option counts. When the deadline is close, certified mail with a return receipt is the safest choice.

Evidence That Actually Changes the Outcome

A liability challenge lives or dies on documentation. The appeals officer will not investigate for you. You need to hand them proof the assessment was wrong.

What that proof looks like depends on the error:

Double-counted income: bank statements, brokerage records, or employer documents showing the same amount was reported more than once.
Payments not credited: canceled checks front and back, electronic payment confirmations, or IRS account transcripts showing the payment posted.
Denied deductions or credits: receipts, invoices, accounting records, and any written IRS correspondence explaining the disallowance.
Incorrect filing status or dependents: court orders, birth certificates, or other records showing your household situation for the year in question.

If the correct number differs from what the IRS assessed, prepare an amended return, Form 1040-X for individuals, to present at the hearing. It is not a filing in the ordinary sense. It is a clean statement of the numbers you believe are correct, in a format the officer already reads fluently. Attach supporting schedules and worksheets to each disputed line. Clearly labeled exhibits do more for credibility than long narrative arguments.

What Happens at the Hearing

Despite the name, this is not a courtroom proceeding. Most CDP hearings happen by phone or through written correspondence. An appeals officer from the IRS Independent Office of Appeals handles the case, and that officer cannot be someone who had prior involvement with your tax liability.⁵ The impartiality rule exists so the review is independent, not a rubber stamp of the collections division.

The officer must verify that the IRS followed all applicable laws and administrative procedures before issuing the lien or levy notice.¹ When the underlying liability has been properly raised, the officer reviews your evidence and decides whether the assessed amount should stand, be reduced, or be eliminated. After the hearing, the officer issues a Notice of Determination explaining the outcome and the reasoning. If the officer agrees with you, the liability is adjusted. If not, the determination letter is your ticket to Tax Court.

Effect on Collection, Interest, and the 10-Year Clock

Filing a timely CDP request suspends levy activity for the tax periods on the notice. The IRS cannot seize wages, bank accounts, or other property for those debts while the hearing and any Tax Court proceedings are pending.⁴ The protection is narrower than it sounds. The IRS can still file new liens, levy for other tax periods not on the CDP notice, offset refunds from other years, and file suit to collect.

There is a trade-off worth thinking through before filing. The same suspension that stops collection also pauses the 10-year statute of limitations on collection. The clock does not restart until the CDP determination becomes final, either because you did not petition the Tax Court or because appeals were exhausted, and the statute cannot expire any earlier than 90 days after the determination is final.⁴ If the collection period is close to running out and the liability challenge is weak, filing a CDP request may hand the IRS more time to collect.

Interest and penalties keep accruing on the unpaid balance throughout the hearing. The suspension freezes collection, not the balance itself. A hearing that takes months means a larger debt if the liability is ultimately upheld.

If You Miss the 30-Day Window

If you miss the CDP deadline, you can still request an equivalent hearing by checking the corresponding box on Form 12153. The deadline for that request is one year from the levy notice date, or one year and five business days from the date the lien was filed.⁷

An equivalent hearing covers the same substantive ground, including a liability challenge if you are otherwise eligible. It comes with two real drawbacks. The IRS is not required to suspend collection while it is pending. And you cannot petition the Tax Court if you disagree with the outcome.⁷ The appeals officer’s decision is effectively final. That is why the 30-day CDP deadline matters far more than the equivalent hearing deadline. Missing the CDP window closes the path to court.

Tax Court Review of a Liability Determination

If the Notice of Determination upholds the liability, you have 30 days from the date of that notice to file a petition with the U.S. Tax Court.¹ The filing fee is $60, waivable by an Application for Waiver of Filing Fee if you cannot afford it.⁸

The standard of review is the single most important detail in the entire process for a liability challenge, and it favors the taxpayer. For issues other than the tax amount, such as whether the IRS followed procedure or whether a collection alternative was properly considered, the court reviews the appeals officer under an abuse of discretion standard, which gives the officer significant deference. When the underlying liability is properly at issue, the review is de novo. The court decides the correct tax amount from scratch, as if the appeals hearing never happened. Whatever the appeals officer concluded on the merits does not bind the court.

On the 30-day deadline: the Supreme Court held in 2022 that this filing period is not a jurisdictional bar and is subject to equitable tolling, which can excuse a late petition when a taxpayer acted diligently but was prevented from filing on time by something outside their control.⁹ Equitable tolling is a last resort, not a plan. File within 30 days.

1
Office of the Law Revision Counsel. 26 USC 6330 – Notice and Opportunity for Hearing Before Levy
2
Federal Register. Definition of Last Known Address
3
Internal Revenue Service. Form 12153 – Request for a Collection Due Process or Equivalent Hearing
4
eCFR. 26 CFR 301.6330-1 – Notice and Opportunity for Hearing Prior to Levy
5
Office of the Law Revision Counsel. 26 USC 6320 – Notice and Opportunity for Hearing Upon Filing of Notice of Lien
6
Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying
7
Taxpayer Advocate Service. Equivalent Hearing (Within 1 Year)
8
United States Tax Court. Court Fees
9
Supreme Court of the United States. Boechler PC v Commissioner of Internal Revenue