CDL DUI Disqualification: How Long You Lose Your CDL, and What Counts

This guide is based on 49 CFR §383.51, the federal regulation that governs CDL disqualification, as published by Cornell Law School's Legal Information Institute. Every disqualification-period figure below is sourced directly to that regulation's text, not to a law firm's summary of it.

DUI Is a "Major Offense," Not a "Serious Violation"

Federal CDL rules split disqualifying conduct into two separate tracks, and confusing them is the easiest way to misjudge your exposure. Our guide to CDL speeding ticket consequences covers the "serious traffic violation" track — things like speeding 15+ mph over the limit — where disqualification only kicks in after multiple qualifying convictions within a rolling three-year window (60 days after two, 120 days after three).

DUI sits in a different, more severe federal table entirely: "major offenses." Under 49 CFR §383.51, a single first conviction for driving under the influence — or refusing a required alcohol test under your state's implied-consent law — is enough to trigger disqualification on its own. There's no multi-conviction threshold to cross first. Other conduct on the same major-offense table includes things like using a CMV to commit a felony; this article is scoped specifically to the DUI/alcohol-related provisions rather than the full list.

Disqualification Periods After a DUI Conviction

49 CFR §383.51's major-offense table sets the following federal minimums:

A few details in that table are easy to misread. First, a refusal to submit to a required test is treated the same as a conviction for disqualification purposes — you don't need an actual DUI conviction on the books for the 1-year disqualification to apply. Second, the "second conviction" trigger for a lifetime disqualification is any combination of major offenses from a separate incident — the regulation's own text specifies "any combination of offenses in this Table," so the two qualifying convictions don't both need to be DUIs. Third, these are federal minimums: a state, court, or employer may impose consequences on top of them, but none can impose less than what §383.51 requires.

Generally, some circumstances shift these numbers — hazmat status and refusal-to-test treatment being the two covered above — so treat the exact table language in §383.51 as the source of truth for any edge case not addressed here, rather than a general paraphrase.

Does a Personal-Vehicle DUI Count?

Yes. This is likely the most-searched question on this topic, and the federal regulation answers it directly. 49 CFR §383.51(a) states that a CDL holder is subject to disqualification "if the holder drives a CMV or non-CMV and is convicted of the violations listed" in the major-offense table — and DUI is on that table. In plain terms: a DUI conviction from driving your own car on a day off, completely unconnected to your commercial driving, counts toward CDL disqualification exactly the same way a DUI behind the wheel of a commercial vehicle would.

There is no federal carve-out for off-duty or personal-vehicle convictions. If you see a source claiming otherwise, treat the regulation's own text — quoted above, sourced directly to 49 CFR §383.51 — as controlling.

When Does the Disqualification Clock Start?

As with the serious-violation rules covered in our CDL speeding ticket consequences guide, §383.51's major-offense table is written around the fact of a "conviction," not the date of the underlying offense — nothing in the major-offense provisions changes that operative point. In practice, this generally means the disqualification clock starts once a case actually resolves in conviction, not on the date of the arrest or incident itself. We won't re-derive FMCSA's conviction-date guidance here; see the linked guide for the full explanation, which applies to CDL disqualification broadly rather than only to speeding-specific cases.

State-Level License Consequences Beyond CDL Disqualification

Federal CDL disqualification is a separate process from what your state may do to your underlying driver's license after a DUI arrest or conviction. Many states run an administrative license suspension (ALS) process tied to a DUI arrest or a chemical-test refusal, independent of and often faster than the criminal case itself, along with their own hearing rights and reinstatement requirements. These processes vary considerably by state and change over time, so this article won't publish a specific state-by-state table of ALS periods or reinstatement steps.

Your state's point system is a related but separate concept — see our guide on how many points lead to a license suspension for how that generally works. A DUI can affect your underlying license status through your state's point or ALS process at the same time federal law is separately disqualifying your CDL — the two tracks run in parallel, not as substitutes for each other. If you're dealing with an active case, check with your state's DMV or BMV for your specific reinstatement requirements, and consider a local attorney familiar with both the criminal and administrative sides of a DUI case.

What to Do Next

• Don't assume the disqualification is automatic on arrest. The federal periods above are tied to a conviction (or a test refusal), not an arrest — confirm your case's actual status with your state's CDL licensing agency rather than assuming the worst before a conviction is entered.
• Understand the stakes of a second qualifying conviction. Because a second major-offense conviction results in a lifetime disqualification with no built-in federal reduction, this is a situation where getting it right the first time matters more than with an ordinary ticket.
• Expect your employer to find out. As with other CDL violations, carriers routinely review driving records, and a disqualification will surface in that review.
• Consult an attorney experienced specifically with CDL and major-offense cases. A general traffic attorney may not be familiar with how the federal major-offense table interacts with your state's criminal DUI process — this article explains the disqualification consequences, not defense strategy, so case-specific legal guidance is the right next step for an active matter.

One more scope note: our speeding ticket calculator estimates standard speeding-ticket fines by state — it does not estimate DUI penalties, court costs, or CDL disqualification consequences, which vary far more than a speeding fine and depend heavily on your specific state's criminal statutes. Use it if a separate speeding matter is also part of your situation, not as a DUI cost estimate.

Frequently Asked Questions

This article is for general informational purposes only and does not constitute legal advice. It is not a guide to fighting or defending a DUI charge. CDL disqualification rules involve federal regulation (49 CFR §383.51) alongside state-specific criminal and administrative processes — consult your state's CDL licensing agency, your state's DMV or BMV, or a licensed attorney for guidance specific to your situation.