Ask Deandra: What’s the Difference Between a DWI and a DUI in Texas?

Here is the longer answer: what each statute actually requires, who gets charged with which, and why a minor caught with alcohol can sometimes also be charged under both.

DWI — Driving While Intoxicated

DWI is the adult intoxication offense in Texas. It is governed by Penal Code §49.04, which makes it a crime for a person to operate a motor vehicle in a public place while intoxicated. “Intoxicated” under §49.01(2) means either:

• (A) not having the normal use of mental or physical faculties due to alcohol, drugs, a controlled substance, or any combination, or
• (B) having an alcohol concentration of 0.08 or more.

DWI is the statute most people think about when they think about “drunk driving.” It applies to anyone of legal drinking age, and it carries the full set of penalties laid out in our first-offense penalties post: jail exposure, fines, license suspension, ignition interlock requirements, and lifetime collateral consequences. A first DWI is a Class B misdemeanor, enhanced to Class A if the BAC is 0.15 or higher under §49.04(d).

DUI — Driving Under the Influence by a Minor

DUI in Texas is a separate statute that applies only to drivers under twenty-one. It is governed by Texas Alcoholic Beverage Code §106.041, which makes it an offense for a minor to operate a motor vehicle in a public place, or a watercraft, while having any detectable amount of alcohol in the system.

The differences from adult DWI are significant:

• DWI requires either a 0.08 BAC or loss of faculties. DUI by a Minor requires only “any detectable amount” which is effectively a zero-tolerance standard.
• A first DUI by a Minor is a Class C misdemeanor, the lowest level of criminal offense in Texas. A first DWI is a Class B misdemeanor, which is significantly more serious.
• A first DUI carries a fine of up to $500, mandatory community service, alcohol awareness courses, and a driver’s license suspension. There is no jail time for a first offense. A first DWI can carry up to 180 days in jail, up to $2,000 in fines, and a longer license suspension.
• DUI cases are typically heard in justice or municipal courts. DWI cases are heard in county or district courts.
• Long-term consequences. Both stay on the record absent expunction or non-disclosure, but the DUI, as a Class C, carries a smaller collateral footprint than the DWI with one important caveat below.

DUI is sometimes described as the “lesser” charge. That is true in terms of immediate punishment. It is not true in every dimension, and a minor charged with DUI should still treat the case seriously.

When a Minor Is Charged with DWI Instead of DUI

A minor under twenty-one can be charged with DWI under §49.04 (not just DUI under §106.041) if the State believes the minor meets the adult intoxication standard. That happens when:

• The minor’s BAC is 0.08 or higher. The per-se prong of §49.01(2)(B) applies regardless of the driver’s age. A minor with a BAC of 0.10 can be charged with adult DWI.
• The minor has lost normal use of faculties. The loss-of-faculties prong of §49.01(2)(A) also applies regardless of age. A minor whose faculties are visibly impaired can be charged with adult DWI even at a lower BAC.
• The State chooses to charge the higher offense. Prosecutors have discretion to charge DWI when the elements are met. They typically do when the case involves a high BAC, an accident, or aggravating facts.

Penalties for DUI by a Minor

A first-offense DUI by a Minor is a Class C misdemeanor punishable by:

• A fine of up to $500.
• Twenty to forty hours of community service. Increased to forty to sixty hours on subsequent offenses.
• An alcohol awareness program. Required to be completed within ninety days.
• A driver’s license suspension. Sixty days for a first offense, with longer suspensions for subsequent offenses.

A second offense increases the penalty range, and a third offense can be enhanced to a higher class of misdemeanor. Repeated DUI offenses by a minor become significantly more serious, both in terms of immediate consequences and in terms of how the offenses affect the minor’s record into adulthood.

Penalties for DWI — Adult or Minor

If a driver of any age is charged with DWI, the penalties under Penal Code §49.04 apply:

• First offense, BAC under 0.15. Class B misdemeanor. Up to 180 days in jail, up to $2,000 fine, license suspension, mandatory minimum 72-hour confinement, possible probation conditions including DWI education, community service, and ignition interlock.
• First offense, BAC 0.15 or higher. Class A misdemeanor under §49.04(d). Up to one year in jail, up to $4,000 fine, mandatory ignition interlock, and additional probation conditions.
• Subsequent offenses. Class A misdemeanor on a second offense, third-degree felony on a third or subsequent offense, with significantly increased exposure.

The financial cost of a DWI (fines, fees, interlock, insurance) generally runs $10,000 to $25,000 or more over the first few years following conviction, before counting any lost wages or professional consequences. The financial cost of a DUI by a Minor is far lower in dollar terms, but the long-term collateral footprint can still be significant.

Driver’s License Consequences — Different for Each

Both offenses carry license consequences, but the structure differs:

• DWI license consequences. Conviction with a jail sentence triggers a suspension under the Texas Transportation Code, separate from any administrative suspension that may have been imposed earlier through the ALR process. Suspensions can range from 90 days to one year on a first offense, longer on subsequent offenses. Conviction where probation is granted does not trigger a suspension on a first offense DWI if the driver education course is completed within 180 days.
• DUI license consequences. A first DUI conviction triggers a sixty-day suspension. Refusal to provide a breath or blood specimen by a minor under twenty-one can also trigger administrative consequences under §106.041 and the implied consent framework.
• Occupational driver’s licenses. Available in either context, with the application process and conditions handled by the court. The Ask Deandra series will cover the ODL/ignition interlock restricted license framework in a separate post.

Loss of driving privileges has cascading effects on insurance, employment, and family life. Both DWI and DUI consequences are worth fighting through ALR or other administrative processes where available.

Why People Confuse DWI and DUI

Texas’s use of distinct DWI and DUI labels is unusual. Many other states use “DUI” as the all-purpose label for any alcohol-impaired driving offense, regardless of the driver’s age. National media coverage of impaired driving uses “DUI” as shorthand. Out-of-state law firms market themselves as “DUI lawyers” even when they handle Texas cases.

The result is widespread confusion in Texas (even among educated drivers) about which statute applies in what situation. Adults sometimes assume “DUI” is what they were charged with. Minors sometimes assume their case is the more serious adult offense. Out-of-state defendants sometimes assume Texas works the way their home state does. None of these assumptions are reliable.

If you are under 21 and not sure what you were charged with, look at the citation, the booking sheet, or the court documents. The cited statute will be either Penal Code §49.04 (DWI) or Alcoholic Beverage Code §106.041 (DUI). The two are not interchangeable, and the wrong assumption can affect your decisions about how to handle the case.

Defending DWI vs. Defending DUI

The defenses to DWI and DUI overlap in some respects and diverge in others:

• Stop and arrest issues are similar. Reasonable suspicion for the stop, probable cause for the arrest, and Fourth Amendment issues apply to both offenses.
• Field sobriety test challenges apply to both. HGN, walk-and-turn, and one-leg stand performance are part of either prosecution.
• Chemical testing differs. DUI typically rests on “any detectable amount,” which is a lower threshold than the 0.08 in DWI. The forensic challenges to instrument calibration, sample integrity, and measurement uncertainty apply differently when the question is detectable presence rather than quantitative concentration.
• Loss of faculties is the DWI prong, not the DUI prong. DUI is per-se. DWI can be charged on either per-se or loss-of-faculties theories.
• Stakes differ. A DUI defense is calibrated to a Class C misdemeanor. A DWI defense is calibrated to Class B or Class A exposure. The level of investment in motion practice, expert witnesses, and trial preparation reflects the stakes.

Both deserve a real defense. Neither should be ignored or pleaded out without legal advice. The collateral consequences of even a Class C DUI for a minor (college disciplinary processes, athletic eligibility, scholarship implications, future employment background checks) can outweigh the courtroom consequences in ways that surprise families.

A Zero Tolerance Case Is Not Automatically Unwinnable

Families hear “any detectable amount” and assume the case is over before it starts. A number came off a machine, the number was above zero, and that is that. It is not that.

The phrase hides a question almost nobody asks out loud: what does it actually mean for an instrument to detect alcohol, and how much weight can that reading carry when the number is very small?

• One drink hours earlier can be enough. A 0.02 breath reading satisfies §106.041. It is nowhere near the 0.08 adult threshold and nowhere near impairment, and it is still a charge.
• Uncertainty matters more as the number shrinks. Breath instruments are calibrated across a range that includes very low readings, but the margin of error carries more weight in relative terms the closer the measured value sits to zero. The same plus-or-minus that is a rounding error at 0.15 is a large fraction of a 0.02.
• The partition ratio is an assumption, not a measurement. The instrument converts breath to blood using a fixed 2100:1 ratio, while real ratios vary across the population from roughly 1,100:1 to 3,400:1. That assumption affects accuracy at every concentration, including the very low ones a zero tolerance case is built on.

So a zero tolerance case is not hopeless because the threshold is low. It is a case where the reliability of one small number is the entire fight, and small numbers are where instruments are least convincing.

Does “Minor” Mean Under 18 or Under 21?

Under 21, not under 18. Section 106.041 borrows the Alcoholic Beverage Code definition of “minor,” which reaches anyone who has not turned twenty-one (Alco. Bev. Code §106.01). Parents of nineteen and twenty year olds are caught off guard by this constantly, because in nearly every other legal context their child is already an adult.

Two related points follow from it.

• The DWI statute contains no minimum age. Nothing in §49.04 or §49.01 limits driving while intoxicated to adults. There is no floor written into either provision. That is why a seventeen year old and a fifty year old are prosecuted under the same statute when the same elements are met.
• Seventeen is the adult line in Texas criminal court. A driver who is at least seventeen and tests at 0.08 or higher faces the adult DWI penalty range rather than the DUI range, plus a one-year license suspension on conviction under Transportation Code §521.342(b). Nearly every parent who runs into the seventeen-to-twenty band expects juvenile treatment and does not get it.
• Under seventeen, it is a different court entirely. A DWI committed before a person turns seventeen is delinquent conduct under Family Code §51.03, which names §49.04 expressly, and it is heard in juvenile court. Penal Code §8.07(b) bars adult prosecution for it unless the juvenile court waives jurisdiction and certifies the case. There is no conviction in that forum, only an adjudication. The plead-guilty-in-open-court and parent-presence rules often cited here come from the fine-only justice and municipal court statutes, which reach a DUI by a minor but not a DWI.

DUI Is Not a Lesser Included Offense of DWI

This is the assumption that costs under-21 defendants the most, and the statute says the opposite in plain words. Under Alcoholic Beverage Code §106.041(g), DUI by a minor is not a lesser included offense of §49.04 (DWI), §49.045 (DWI with a child passenger), §49.06 (BWI), or §49.061 (BWI with a child passenger).

They are separate offenses in separate codes with separate elements. A DWI charge does not arrive with a built-in DUI safety net that a jury can retreat to, and the State is under no obligation to offer one.

Practically, that means the plan in an under-21 case charged as DWI is never “get it knocked down to the DUI.” Any reduction is a negotiated outcome or a new charging decision, not a lesser verdict a jury can reach on its own. That changes how the case is worked from the first week.

One procedural difference runs the other way, and it is worth knowing before the phone rings. An officer charging a minor with DUI is not required to take the minor into custody and may issue a citation instead (§106.041(i)). Some families get a call about a court date rather than a call from a jail, which is a materially different night from a DWI arrest.

The Three License Consequences in an Under-21 Case

This is the most misreported part of underage cases, and the structure matters more than any single number. There are three separate license consequences, they come from three different events, and they get mashed together into one wrong figure constantly.

1. The administrative suspension, which turns on the test rather than the charge. An ALR suspension for a driver under 21 is driven by whether they refused or failed chemical testing. The period does not depend on whether the case was filed as DWI under 21 or as DUI by a minor.

	Driver under 21	Adult
Refused testing, no priors	180 days	180 days
Refused testing, with a prior	2 years	2 years
Failed testing, no priors	60 days	90 days
Failed testing, one prior	120 days	1 year
Failed testing, two or more priors	180 days	1 year

A prior here means a conviction under §106.041 or under Penal Code §§49.04, 49.045, 49.06, 49.07, or 49.08. One wrinkle applies only to minors: the 60-day period attaches where the driver gave a specimen or was never asked for one at all, so a minor can face an administrative suspension without ever having refused anything.

2. The suspension on conviction of DWI while under 21. Where a person under 21 is convicted of DWI, DWI with a child passenger, intoxication assault, or intoxication manslaughter, DPS suspends the license for one year, whether or not an educational program is also ordered (Transp. Code §521.342(b)). One narrow exception sits in the same subsection: where the person is placed on community supervision and ordered not to operate a vehicle without an ignition interlock, the statute reads as though the automatic suspension can be probated.

3. The suspension for not finishing what the court ordered. Missing the alcohol awareness program or the community service inside the 90-day window carries its own suspension of up to six months, and where a program was required, DPS can hold the suspension open until it receives proof of completion (§106.115(d)(1)(A), Transp. Code §521.342(b)).

Two pieces of good news sit inside all of that. A person suspended for non-completion stays eligible for an occupational driver’s license (Transp. Code §521.342(c)). And where the minor is younger than eighteen, the court can require a parent or guardian to attend the alcohol awareness program alongside them, which in practice is often what gets it finished.

The 90-Day Deadline That Can Cut the Fine in Half

The community service in a DUI by a Minor case carries a deadline that is worth real money, and it gets treated as paperwork.

• The hours are tiered. Not less than 20 and not more than 40 where the minor has no prior DUI conviction, and not less than 40 and not more than 60 where there is one (§106.041(d)(1)-(2)). A prior counts if it is a conviction, a Family Code adjudication for the same conduct, or an order of deferred disposition on a §106.041 charge (§106.041(h)).
• The service has to be the right kind. It must relate to education about or prevention of misuse of alcohol (§106.041(e)). Generic volunteer hours may not satisfy the requirement.
• Proof is due within 90 days of final conviction, and the court can extend that by up to another 90 days for good cause (§106.115(c)).
• Timely proof can cut the fine. Present the evidence on time and the court may reduce the fine to no less than one-half of the original amount. Half is the floor on the reduction, not a promise that it happens (§106.115(c)).
• Missing it costs the license. Where the evidence is not presented in time, the court shall order DPS to suspend the license for a period not to exceed six months, or deny issuance for that period where there is no license yet (§106.115(d)(1)(A)). The same six-month exposure attaches to not finishing the alcohol awareness program.

There is one more tier most families never hear about until it lands. A defendant who is at least seventeen with two prior DUI convictions is no longer looking at a Class C at all. Section 106.041(c) strips the Class C classification and sets its own punishment: a fine of $500 to $2,000, confinement of up to 180 days, or both.

Read together, the completion paperwork is worth both money and driving privileges. Families who treat the community service as the punishment and the paperwork as clerical routinely lose both.

Deferred Adjudication and Sealing for a Minor

The deferred picture splits along the same statutory line as everything else.

• Class C DUI, first offense. Deferred is available. The minor pleads guilty or no contest, the judge defers a finding of guilt, and the minor serves a probation term with conditions: an alcohol awareness class, community service, no drinking, regular reporting. Finish clean and the case is dismissed without a conviction.
• Class B DWI. Deferred is available in certain circumstances, and a minor charged under the Penal Code gets the same plea and trial options an adult gets. That makes the decision to fight rather than take a negotiated disposition more consequential, and it has to account for the statutory exclusions that apply to DWI deferred generally.
• Two or more prior DUI convictions. Deferred disposition and deferred adjudication are both off the table (§106.041(f)), and a prior order of deferred disposition counts as one of those priors (§106.041(h)(2)). Taking deferred once narrows what is available the next time.

Here is the part families get wrong most often. Even where deferred is granted on a Class C DUI, the record of the arrest and of the deferred proceeding does not disappear on its own. Texas allows eligible people to petition for an Order of Nondisclosure, which seals the record from most public access. Nondisclosure carries waiting periods and eligibility requirements, it is not automatic, and it is a separate legal proceeding filed after the deferred is successfully completed. Nobody does that step for you. A family that finishes deferred and assumes the record is gone finds out otherwise during a job application or a licensing review years later.

DWI vs. DUI at a Glance

	DUI by a minor	DWI
Statute	Alco. Bev. Code §106.041	Penal Code §49.04
Who it applies to	Under 21 only	Any age
Threshold	Any detectable amount	0.08 or loss of faculties
Classification	Class C misdemeanor	Class B, or Class A at 0.15
Jail exposure, first offense	None	Up to 180 days
Fine, first offense	Up to $500	Up to $2,000
Court	Justice or municipal	County or district

“Less bad” is not “harmless.” Both stay on the record absent expunction or nondisclosure, and a Class C conviction still surfaces in places a nineteen year old has not thought about yet.

Where to Go From Here

This page carries both the definitional difference and the underage case itself. A few other pages pick up where it stops.

• If you are the parent, the questions that come first are getting your child released, the 15-day license deadline, whether you can hire and speak to the lawyer, and what changes if the driver is under seventeen. Those are answered on My Son or Daughter Got a DWI.
• On fighting the suspension, the ALR hearing and the wider suspension picture are on License Suspension.
• On deferred generally, including the exclusions that apply to adult DWI, see Deferred Adjudication.
• On the numbers themselves, the 0.08 threshold is broken down on The Legal BAC Limit in Texas, and the long tail of interlock, probation fees, and insurance is on The Total Cost of a Texas DWI.
• On where the charge sits, every level from Class B to first-degree felony is laid out on Texas DWI Charges, and the four routes that make one a felony are on Felony DWI.

The Bottom Line

DWI and DUI in Texas are not the same offense and confusing them costs defendants. DWI applies to adults and certain minors, requires either a 0.08 BAC or loss of faculties, and carries jail-level criminal exposure. DUI applies only to minors under twenty-one, requires only any detectable amount of alcohol, and is classified as a Class C misdemeanor with no jail exposure on a first offense. A minor with a BAC at or above 0.08, or with visible loss of faculties, can be charged with DWI rather than DUI. Both offenses deserve defense attention. Both have collateral consequences that follow defendants long after the immediate punishment ends. Knowing which statute applies to your case is the first step in defending it correctly.

Frequently Asked Questions

What happens with an underage DWI in Texas?

It depends which statute is charged. A DUI under Alcoholic Beverage Code §106.041 is a Class C misdemeanor for a first offense, resolved with a fine, an alcohol awareness program, and community service. A DWI under Penal Code §49.04 is a Class B misdemeanor with jail exposure and a one-year license suspension on conviction.

What is the zero tolerance law in Texas?

It is the rule that a driver under 21 commits an offense with any detectable amount of alcohol in their system rather than at a 0.08 threshold. It is enforced through §106.041, and it requires no proof of impairment or intoxication.

What is DUI by a minor in Texas?

It is the offense of operating a motor vehicle in a public place, or a watercraft, while under 21 with any detectable amount of alcohol. A first offense is a Class C misdemeanor carrying a fine of up to $500, an alcohol awareness program, and 20 to 40 hours of community service.

Can a driver under 21 be charged with DWI in Texas?

Yes. The DWI statute has no minimum age, so a driver under 21 at 0.08 or higher, or who has lost the normal use of their faculties, can be charged the way an adult would be. A DUI is not a lesser included offense of DWI, so there is no automatic fallback to the lower charge.

What are the penalties for a minor DWI in Texas?

A DUI first offense carries up to a $500 fine, an alcohol awareness program, and 20 to 40 hours of community service, rising to 40 to 60 hours on a second, and to a Class B misdemeanor for a defendant at least 17 with two priors. A DWI carries the adult Class B range, up to 180 days in jail and a $2,000 fine, plus a one-year license suspension on conviction while under 21.

Can a minor get deferred adjudication in Texas?

Yes for a first-offense Class C DUI, where completing the conditions results in dismissal without a conviction. Deferred is available for a Class B DWI only in certain circumstances, and it is unavailable altogether to a minor with two or more prior DUI convictions. In either case the record does not disappear on its own, and sealing requires a separate nondisclosure proceeding with its own waiting period.

What does “any detectable amount” mean in Texas?

It means any measurable trace of alcohol, with no minimum threshold and no requirement of impairment. Because the standard sits so close to zero, the reliability of the measurement itself, including instrument uncertainty and partition ratio variation, is a legitimate line of challenge.

DWI and DUI Defense at Deandra Grant Law

Deandra Grant Law defends DWI, DUI, and intoxication-offense cases across North and Central Texas in Dallas, Fort Worth, Plano, McKinney, Frisco, Allen, Lewisville, Denton, Rockwall, and Waco. We handle adult DWI cases and minor DUI cases with the same forensic and procedural rigor, calibrated to the stakes of each case. Our team includes an ACS-CHAL Forensic Lawyer-Scientist with a Master of Science in Pharmaceutical Science and a Graduate Certificate in Forensic Toxicology.

If you or your child has been charged with DWI or DUI in Texas, call Deandra Grant Law at (214) 225-7117 or visit texasdwisite.com to schedule a confidential consultation. And remember: the 15-day ALR deadline runs from the date of service of the notice of suspension.

Have a DWI question you want answered in this series? Submit it at texasdwisite.com — you might see it featured in a future Ask Deandra post.