One of the most common questions I am asked is “what happens if I am convicted of a DUI” or some form of that question. If you search the internet for Boise, Idaho DUI penalties, you are likely to find a rash of information explaining maximum penalties that almost never actually happen. While I would never advocate for driving drunk or tell you that DUI penalties are no big deal, I also don’t think it is right to spread fear-mongering misnomers about the subject. The truth is that you will likely not be prosecuted to the fullest extent of the law unless you have a bad attorney. The DUI attorneys at Attorneys of Idaho, can help keep that from happening. All that said, it here is look at what the maximum penalties are as a starting point.
DUI Penalties
First DUI
| Classification | Misdemeanor |
| Jail exposure | Up to 6 months in jail. |
| Fine exposure | Up to $1,000. |
| License suspension | Court suspension of 90 to 180 days. The first 30 days are absolute, with no driving privileges. After that, the court may allow restricted driving privileges for work or family health needs. |
| Ignition interlock | Generally required after the absolute suspension unless an exception applies. |
| Maximum vs. realistic outcome | The maximum is not automatic. In many first-offense cases, the fight is about reducing jail exposure, protecting driving privileges, limiting fines, and avoiding unnecessary conditions. |
Second DUI Within 10 Years
| Classification | Misdemeanor |
| Jail exposure | Mandatory minimum 10 days in jail, with the first 48 hours consecutive and at least 5 days served in jail. Up to 1 year total. |
| Fine exposure | Up to $2,000. |
| License suspension | Mandatory additional 1-year suspension after release from confinement, with no driving privileges during that year. |
| Ignition interlock | Required after the mandatory license suspension. |
| Maximum vs. realistic outcome | A second DUI is much more serious because there is mandatory jail and a hard license suspension. The realistic goal is often to limit jail time, structure the sentence, and preserve as much normal life as possible. |
Third DUI Within 10 Years
| Classification | Felony |
| Jail or prison exposure | Mandatory minimum 30 days in jail if the court does not impose prison. Up to 10 years in state prison. |
| Fine exposure | Up to $5,000. |
| License suspension | Mandatory minimum 1-year suspension after release from imprisonment, with no driving privileges during that year. Additional suspension time may apply. |
| Ignition interlock | Required after the mandatory suspension. |
| Maximum vs. realistic outcome | This is where DUI becomes a felony. The realistic focus is usually avoiding or reducing prison exposure, building mitigation, and challenging whether prior offenses properly enhance the charge. |
Excessive DUI — BAC of .20 or Higher
| Classification | Misdemeanor for a first excessive DUI. Repeat excessive DUI can be charged as a felony. |
| Jail exposure | For a first excessive DUI, mandatory minimum 10 days in jail, with the first 48 hours consecutive. Up to 1 year total. |
| Fine exposure | Up to $2,000 for a first excessive DUI. Higher fines may apply for repeat excessive DUI. |
| License suspension | Mandatory 1-year suspension after release from confinement, with no driving privileges during that year. |
| Ignition interlock | Interlock consequences may apply. Repeat excessive DUI requires interlock after the mandatory suspension. |
| Maximum vs. realistic outcome | Excessive DUI is treated more harshly than a standard first DUI because of the high BAC. The realistic fight often focuses on the accuracy of the test, timing of the test, mitigation, and limiting jail time. |
Repeat Excessive DUI Within 5 Years
| Classification | Felony |
| Jail or prison exposure | Up to 5 years in state prison. If prison is not imposed, mandatory minimum 30 days in jail. |
| Fine exposure | Up to $5,000. |
| License suspension | Mandatory minimum 1-year suspension after release from imprisonment. Additional suspension may apply. |
| Ignition interlock | Required after the mandatory license suspension. |
| Maximum vs. realistic outcome | A repeat excessive DUI is a felony. The realistic defense may involve challenging the BAC evidence, prior qualifying convictions, and pushing for alternatives to prison where available. |
Aggravated DUI
| Classification | Felony |
| Jail or prison exposure | Up to 15 years in state prison. If prison is not imposed, mandatory minimum 30 days in county jail, with the first 48 hours consecutive. |
| Fine exposure | Up to $5,000. |
| License suspension | Mandatory minimum 1-year suspension after release from imprisonment. Additional suspension may apply. |
| Ignition interlock | May be required depending on the sentence and driving consequences. |
| Maximum vs. realistic outcome | Aggravated DUI usually involves great bodily harm, permanent disability, or permanent disfigurement. These cases are not routine DUI cases. The realistic fight often involves causation, injury severity, toxicology, accident reconstruction, and mitigation. |
Underage DUI — Under 21
| Classification | Misdemeanor |
| Jail exposure | Penalties vary depending on BAC level and whether it is a repeat offense. |
| Fine exposure | Fine exposure varies by offense level and prior history. |
| License suspension | License suspension is often one of the biggest consequences for underage DUI cases. |
| Ignition interlock | May apply depending on the facts and sentence. |
| Maximum vs. realistic outcome | Underage DUI cases are often about more than the immediate penalty. A good defense should consider school, employment, insurance, license consequences, and the long-term impact on the young person’s record. |
License Suspension
| What it affects | Your ability to drive legally after a DUI arrest or conviction. |
| How long it lasts | Suspension length depends on the DUI level, prior offenses, refusal issues, and the court’s sentence. |
| Costs | Reinstatement fees and related costs may apply. |
| Maximum vs. realistic outcome | For many people, the license suspension is the punishment that disrupts life the most. The realistic goal is often to preserve lawful driving options wherever possible. |
Ignition Interlock
| What it is | An ignition interlock device requires a breath sample before the vehicle will start. |
| Costs | Installation, monitoring, and monthly costs usually fall on the driver. |
| Driving impact | Interlock requirements are often tied to the license suspension and reinstatement process. |
| Maximum vs. realistic outcome | Interlock requirements can be expensive and inconvenient, but they may also allow a person to keep driving legally after part of the suspension is complete. |
Probation
| What it is | Probation is a court-ordered supervision period with conditions the defendant must follow. |
| Possible conditions | Probation may include alcohol testing, treatment, monitoring, community service, reporting requirements, and no new criminal violations. |
| Violation risk | Probation violations can create additional jail exposure. |
| Maximum vs. realistic outcome | Probation can be manageable, but it needs to be taken seriously. Violating probation can turn a controlled sentence into a much bigger problem. |
Fines and Court Costs
| What they include | Court fines, court costs, treatment costs, testing costs, monitoring fees, reinstatement fees, and other related expenses may apply. |
| Other financial impact | A DUI can also lead to insurance increases, missed work, interlock costs, transportation problems, and long-term financial consequences. |
| Maximum vs. realistic outcome | The fine is only one part of the financial damage. A DUI can cost far more than the number listed in the criminal statute. |
Jail
| What it affects | Jail affects your freedom, job, family obligations, and ability to keep life stable during and after the case. |
| Exposure | Exposure ranges from no mandatory jail in some lower-level cases to mandatory jail or prison exposure in repeat, excessive, aggravated, or felony cases. |
| Maximum vs. realistic outcome | Jail exposure is one of the main reasons DUI cases should be taken seriously. The maximum is not always imposed, but mandatory minimums and repeat-offense rules can limit the court’s flexibility. |
As you can see, DUI carries some pretty harsh maximum penalties. However, I want to emphasize again that a good lawyer can often get you cleared of charges or have penalties greatly reduced. For instance, it is not uncommon for first time offenders to only be sentenced to probation. People with good attorneys rarely get maximum penalties.
What To Actually Expect For A First-Time DUI Offense
The court can and may punish you in many ways: jail time, Sheriff’s labor detail, community service, substance abuse counseling, fines, court costs, driver’s license suspension, and probation. How much of each of these depends on how good of a defense you can present.
- Jail: Generally, for a first time DUI the court will sentence you to between 90-180 days of jail, but then suspend all but 5-10 days, placing you on probation. So, in reality you will only have to do between 5-10 total days of jail, and the rest is suspended and held over your head for the duration of your probation to make sure that you stay out of trouble. Ordinarily, the judge will allow sentencing alternatives like Sheriff’s labor detail or community service to substitute for actual jail. Eight hours of community service is counted as one day of jail. You also get credit for the time you serve when you were arrested. Even if you bail out after a few hours, this may count as 1 or 2 days of credit (if you were booked before midnight and released after).
- Probation: Probation usually ranges between 1-2 years and unless there are aggravating circumstances, the probation will be unsupervised. This means you will not have a probation officer. You are simply ordered by the court to stay out of trouble during the probationary period, otherwise you could face the suspended penalties.
- Fine: Ordinarily it is between $500-$1,000 plus court costs of $202.50. See here for more info on the real cost of a DUI.
- Substance abuse counseling: For any DUI conviction, the court will require you to get a Substance Abuse Evaluation from a licensed Substance Abuse Counselor to determine the amount of treatment that is necessary in your situation. Generally, the court will order 16 hours of counseling for a first time DUI, as well as require you to attend a 2-hour Victim’s Impact Panel.
- Driver’s License Suspension: The court will order a suspension of your driver’s license which is in addition to the license suspension that is initiated by the DMV. On a first-time DUI the ADA and Canyon County courts will usually suspend your license for 6 months, allowing for a restricted license to drive to and from work only after 30 days of absolute suspension has been served.
DUI is a serious crime that carries some serious penalties. But if you have been accused of one, you can exhale a bit. It is very unlikely that you will prosecuted to the fullest extent of the law, especially if you hire a knowledgeable attorney.
The materials at this web site have been prepared for informational purposes only and should not be construed as legal advice or legal opinion on any specific facts or circumstances. These materials do not, and are not, intended to constitute legal advice. Readers should not act upon this information without seeking professional counsel. The information provided at this site is subject to change without notice.
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Important: Idaho DUI penalties depend on the charge, prior history, BAC, whether anyone was injured, and what the judge does at sentencing. The maximum punishment is not always the realistic outcome in every case.
