A Collection Due Process hearing exists to review collection: the lien, the levy, the payment alternatives. But Congress included one provision that turns it into something more. If you never had a fair chance to dispute the tax, you can dispute it here.
That provision is IRC 6330(c)(2)(B), and when it applies, it is one of the most valuable rights a taxpayer has in collection.
The statutory test
IRC 6330(c)(2)(B) says you may challenge the existence or amount of the underlying tax liability for any tax period if you did not receive any statutory notice of deficiency for that liability or did not otherwise have an opportunity to dispute it. Lien hearings incorporate the same rule through IRC 6320(c).
Two separate gates. Pass either one and the liability is open for discussion.
Gate one: did you receive a notice of deficiency?
For income tax assessed after an audit, the IRS generally must mail a Notice of Deficiency before assessing. If you received it in time to petition the Tax Court and did not, you cannot use CDP to dispute the liability. You had your chance.
The key word is "receive." Treas. Reg. 301.6330-1(e)(3), Q&A-E2, says receipt for this purpose means receipt in time to petition the Tax Court for a redetermination. A notice that was mailed to your last known address but never actually reached you, or reached you after the petition period ran, does not cut off the right.
That raises factual questions. Was the notice returned unclaimed? Did you move, and had you told the IRS? Did a family member sign for it? The answers decide whether gate one is open. Deliberately refusing delivery is a different story; courts do not reward taxpayers who avoid their mail.
Gate two: did you otherwise have an opportunity to dispute it?
This is where most of the litigation happens. The same Q&A-E2 says an opportunity to dispute includes a prior opportunity for a conference with Appeals that was offered either before or after the assessment.
That has real consequences:
- Trust Fund Recovery Penalty. If you received Letter 1153 and could have appealed the proposed penalty, you generally had an opportunity to dispute it, even if you did not use it.
- Prior CDP notice. Q&A-E7 says that if you received an earlier CDP lien notice for the same tax and period and did not request a hearing, you had a prior opportunity to dispute the liability.
- Assessable penalties. Many penalties are assessed without a notice of deficiency. Whether you had an opportunity to dispute them depends on whether Appeals review was offered.
An opportunity you never actually had does not count. A letter that never reached you, or an Appeals offer that was never made, is not an opportunity.
Evidence that tends to matter
Whether you "received" a notice of deficiency is decided on evidence, and the IRS has some of it. Ask for, and collect:
- A copy of the notice of deficiency and the certified mail list (often called a PS Form 3877) showing where and when it was mailed.
- U.S. Postal Service tracking for the certified article, including whether it was delivered, returned unclaimed, or returned undeliverable.
- Your filing history showing the address on your most recently filed return, which is the starting point for the last known address under Treas. Reg. 301.6212-2.
- Proof of any change of address you gave the IRS, such as Form 8822.
- Your account transcript, which will show the assessment date and whether the IRS recorded a returned notice.
A notice mailed to the wrong address raises a different question: whether it was a valid notice at all. That issue overlaps with invalid notices of deficiency, and the answer can change both your CDP rights and the validity of the assessment.
Self-reported tax
What about tax you reported on your own return? No notice of deficiency issues for self-assessed tax, so gate one is technically open. The Tax Court held in Montgomery v. Commissioner, 122 T.C. 1 (2004), that a taxpayer could challenge a self-reported liability in CDP when there had been no prior opportunity to dispute it. If you made an error on your own return and the IRS assessed what you reported, CDP may be a place to raise it. An amended return is often the cleaner route, but the CDP right is worth knowing.
Issues already decided
IRC 6330(c)(4) adds another limit. You cannot raise an issue that was raised and considered at a previous CDP hearing or in another administrative or judicial proceeding in which you meaningfully participated. Q&A-E11 says that if an Appeals officer considers liability anyway when the taxpayer was not entitled to raise it, that part of the decision is not treated as part of the Notice of Determination.
How Tax Court reviews a liability challenge
This is where the stakes become clear. When the underlying liability is properly at issue, the Tax Court reviews it de novo. Collection decisions, by contrast, are reviewed for abuse of discretion. The Tax Court explained the two standards in Sego v. Commissioner, 114 T.C. 604 (2000), and Goza v. Commissioner, 114 T.C. 176 (2000).
De novo means the judge decides the liability fresh. That is essentially the deficiency trial you never got. See our guide to Tax Court review of CDP determinations for how the rest of the case is reviewed.
Raise it, then prove it
Under Q&A-F3, the Tax Court only considers issues properly raised at the CDP hearing, and an issue is not properly raised if you fail to present evidence after being given a reasonable opportunity. The Tax Court enforced that requirement in Giamelli v. Commissioner, 129 T.C. 107 (2007).
So a liability challenge is not a box you check on Form 12153 and forget. You need to:
- State in the request that you dispute the liability and why you are entitled to raise it.
- Explain the facts showing you did not receive the notice of deficiency or otherwise have an opportunity.
- Submit evidence on the merits: records, returns, substantiation, the same proof you would bring to an audit.
- Respond to the settlement officer's requests by the deadlines given.
Liability and collection together
You can raise liability and collection alternatives in the same hearing. That is often wise. If the liability challenge succeeds only in part, you still need a plan for what remains. Ask Appeals to address both, so the determination resolves the whole picture. The firm's overview of IRS levies covers what happens if the collection side is left unresolved.
Let's talk
Whether you had a prior opportunity is a fact question with legal consequences, and the answer is often buried in the IRS's own mailing records. If you think you owe less than the IRS says and you never got a real chance to fight it, call (813) 229-7100. Let's talk.