When the IRS files a lien, issues a levy notice, or terminates an installment agreement, there are two separate administrative appeals available — and they are not interchangeable. Form 9423 opens a Collection Appeal Program (CAP) case. Form 12153 requests a Collection Due Process (CDP) hearing. They run on different clocks, cover different ground, and only one of them keeps the courthouse door open. Choosing the wrong one, or letting the shorter deadline lapse while you decide, narrows the options permanently.
Form 9423 (CAP) appeals a specific collection action and is usually resolved quickly, but the decision is binding and cannot be reviewed by the Tax Court. Form 12153 (CDP) responds to a lien-filing or final levy notice within 30 days, can consider collection alternatives and sometimes the underlying liability, and preserves Tax Court review.
What does Form 9423 (CAP) actually cover?
CAP is the broader of the two in terms of actions. According to the Taxpayer Advocate Service, a CAP appeal can be filed over levies (before or after a notice of levy is served, and before or within 10 days of a property seizure), lien matters (including the filing of a Notice of Federal Tax Lien and denials of requests to discharge, subordinate, or withdraw one), and installment agreements that are rejected, terminated, or modified (TAS, Collection Appeals Program).
The trade-off is finality. The IRS is explicit that once Appeals decides a CAP case, that decision binds both you and the IRS, and you cannot petition the U.S. Tax Court for judicial review of it. CAP is fast and procedural: it asks whether the collection action was appropriate, not whether you owe the tax.
What does Form 12153 (CDP) cover, and why is the 30 days so important?
CDP rights are triggered by specific notices — a Notice of Federal Tax Lien filing (Letter 3172) and a final notice of intent to levy (LT-11 or Letter 1058). You have 30 days from that notice to request a CDP hearing on Form 12153 (IRS, CDP FAQs).
A timely CDP request is worth more than a CAP case in three ways: Appeals can consider collection alternatives such as an installment agreement, offer in compromise, or currently-not-collectible status; the underlying liability itself can be raised in limited circumstances (broadly, where you had no earlier opportunity to dispute it); and if you disagree with the determination, you can petition the Tax Court.
What happens if I miss the 30-day CDP deadline?
The same form has a second box. Checking "Equivalent Hearing" on line 7 of Form 12153 requests an equivalent hearing, generally available within one year of the notice. It gets you an Appeals conference — but it does not carry the protections of a timely CDP request: it does not bar the IRS from levying, it does not suspend the 10-year collection statute, and the determination is not reviewable in Tax Court.
That asymmetry is the practical reason the 30-day clock matters more than any other date in this process.
How do the two forms compare side by side?
| Form 9423 — CAP | Form 12153 — CDP | |
|---|---|---|
| Triggered by | A specific collection action: lien, levy, seizure, installment-agreement rejection or termination | Notice of Federal Tax Lien filing, or final notice of intent to levy |
| Deadline | Generally within 30 days of the action; 10 days after a seizure | 30 days from the notice (or an equivalent hearing within about a year) |
| Collection alternatives considered | No | Yes |
| Underlying liability considered | No | In limited circumstances |
| Tax Court review | No — decision is binding | Yes, if the request was timely |
| Typical speed | Fast | Slower |
Can I file both?
They are not mutually exclusive in every situation, but they overlap, and the IRS notes that participating in one type of hearing can preclude certain issues from being considered again in a second one. Where a final levy notice or lien filing has been issued and the 30 days is still open, the CDP request is normally the one that preserves the most rights; CAP is the tool for the fast procedural fights that CDP does not reach — a rejected installment agreement, a seizure about to happen, a denied lien withdrawal. This is a judgement call about your specific facts, which is why it belongs with a representative rather than a checklist.
How do I fill these forms without retyping the same taxpayer details?
Both forms want the same core data — taxpayer name, SSN or EIN, address, phone, and the tax periods at issue — and so does the Form 2848 that authorises you to represent someone. If you handle more than one of these a month, saving the taxpayer's details once and filling from that profile removes the most common source of error: a transposed identifier retyped for the fourth time.
Filly bundles the current Form 9423 in its official-forms library, so you can fill it directly and export it — see the step-by-step guide to filling Form 9423. Form 12153 isn't bundled; download it from irs.gov, upload the PDF, and the AI detects the fields and fills them from the same saved profile. Representatives filing on someone's behalf will also want the Form 2848 power of attorney guide, and non-IRS authorisations can start from the power of attorney template.
Frequently asked questions
Is a CAP decision really final?
Yes as to that appeal. The IRS states the Appeals decision in a CAP case is binding on both parties and cannot be taken to Tax Court, though other administrative or judicial routes may exist for the underlying issue in some circumstances.
Can I dispute how much I owe using Form 9423?
No. CAP examines whether the collection action was appropriate. Disputes about the amount belong in a CDP hearing (where permitted), an audit reconsideration, a doubt-as-to-liability offer in compromise, or a refund claim after paying.
Which notices give me CDP rights?
Letter 3172 (Notice of Federal Tax Lien filing) and the final notice of intent to levy — LT-11 or Letter 1058. A routine balance-due notice does not.
Does filing Form 12153 stop a levy?
A timely CDP request generally suspends levy action on the periods at issue and pauses the collection statute. An equivalent hearing request filed after the 30 days does neither.
Is this tax or legal advice?
No. This is a general explanation of two IRS forms and their published rules. Which appeal fits your facts, and what it costs you to choose one, is a question for a licensed tax professional or attorney — verify every deadline against the current IRS instructions for the form.