California DUI penalties by offense escalate sharply with each prior conviction inside a rolling 10-year window: a first offense is a misdemeanor with a few days of jail exposure and roughly $1,800 or more once assessments are added, a second and third bring longer jail floors and multi-year license actions, and a fourth crosses into felony territory with potential state prison. Every DUI case also runs on two tracks at once, because the DMV suspends your license administratively based on the arrest itself, separate from anything the court does at sentencing.
How the 10-Year Window Works
Every escalation in the Vehicle Code is measured the same way: convictions within the past 10 years. If your most recent prior is older than that, a new arrest is sentenced as a first offense.1California Legislative Information. California Code VEH 23546 One exception overrides the clock entirely. If you have a prior felony DUI, or a vehicular manslaughter conviction involving intoxication, any later DUI is charged as a felony no matter how long ago the earlier offense occurred.2California Legislative Information. California Code VEH 23550.5
First Offense
A first misdemeanor DUI carries a jail sentence of 96 hours to six months and a base fine of $390 to $1,000.3California Legislative Information. California Code VEH 23536 Most first offenders actually receive three to five years of informal probation, which typically cuts the custody piece down to a couple of days but attaches other conditions.
Probation requires enrollment in a licensed DUI education program. Below a 0.20% BAC, the program runs at least three months and 30 hours of classes, counseling, and interviews. At 0.20% or higher, or after a chemical test refusal, the court orders a nine-month program with at least 60 hours of activities.4California Legislative Information. California Code VEH 23538
The court imposes a six-month license suspension on conviction, and the DMV separately imposes a four-month Administrative Per Se suspension based on the arrest.5California Department of Motor Vehicles. DUI First Offenders Alcohol Involved – Non-Injury 21 and Older Those often overlap. For a first offense without injury, you can install an ignition interlock device (IID) for six months and drive without restriction, or take a restricted license for one year limited to work and DUI-program travel. Either path requires SR-22 insurance.
Second Offense
A second DUI within 10 years carries 90 days to one year in jail and a base fine of $390 to $1,000.6California Legislative Information. California Code VEH 23540 With probation, the minimum custody floor drops to 96 hours, though judges routinely impose more.
The education requirement jumps. The court orders either an 18-month or 30-month licensed program, depending on the circumstances, and you get no credit for classes completed before the new violation date.7California Legislative Information. California Code VEH 23542 The DMV suspends your license for two years. To regain any driving privilege during that period, you need an IID for one year, SR-22 insurance, and proof of DUI program enrollment.
Third Offense
A third conviction within 10 years carries a mandatory 120-day minimum in county jail, up to one year, plus a $390 to $1,000 base fine.1California Legislative Information. California Code VEH 23546 Probation can lower the custody floor to 30 days, but the court must find good cause.8California Legislative Information. California Code VEH 23548
The court orders an 18-month or 30-month program, depending on whether you previously completed one.8California Legislative Information. California Code VEH 23548 Your license is revoked for three years, and the DMV designates you a habitual traffic offender for three years after the conviction.1California Legislative Information. California Code VEH 23546 Getting back on the road requires a two-year IID, SR-22 insurance, and proof of program enrollment. A third DUI is still a misdemeanor, but the custody and license consequences rival what many people expect from a felony.
Fourth or Subsequent Offense
A fourth DUI within 10 years is charged as a felony. The statute authorizes state prison time with a sentencing triad of 16 months, two years, or three years, or county jail for 180 days to one year, plus the $390 to $1,000 base fine.9California Legislative Information. California Code VEH 23550 – Section Referenced via VEH 23546 Which track the prosecution pursues depends on the facts and the record.
The DMV revokes your license for four years and applies the three-year habitual traffic offender designation. Reinstatement requires an IID for three years, SR-22 insurance, and completion of an 18-month or 30-month DUI program. Felony consequences also reach beyond the Vehicle Code: loss of firearm rights, potential discipline against professional licenses, and a permanent felony record unless later reduced.
When a DUI Causes Injury
If impaired driving injures someone other than the driver, the charge moves from Vehicle Code 23152 to Vehicle Code 23153, which is a separate and more serious offense.10California Legislative Information. California Code VEH 23153 It’s a wobbler, chargeable as either a misdemeanor or a felony depending on injury severity and record.
As a felony, even a first offense can bring state prison time. As a misdemeanor, it still requires 90 days to one year in county jail, with fines of $390 to $1,000. Probation cuts the minimum custody to five days. Severe injuries or multiple victims can trigger great bodily injury enhancements that add years. The court-ordered license suspension for a first injury DUI is one year.
Enhancements That Stack on Any Tier
Certain aggravators add mandatory time or program length on top of the base sentence, and they can apply together.
High BAC and Chemical Test Refusal
A BAC of 0.15% or higher, or a chemical test refusal, is a special factor the court must consider when setting the sentence.11California Legislative Information. California Code VEH 23578 For first offenders at 0.20% or above, that generally means the nine-month program and tighter probation terms.
Refusing the chemical test also triggers its own separate, mandatory jail enhancement that cannot be stayed or waived:12California Legislative Information. California Code VEH 23577
- Second DUI: 96 additional hours
- Third DUI: 10 additional days
- Fourth or subsequent DUI: 18 additional days
Refusal also extends the DMV’s administrative suspension beyond what applies to a failed test.
Minor Passenger Under 14
If a child under 14 was in the vehicle, the court adds consecutive jail time that cannot be reduced or suspended:13California Legislative Information. California Code VEH 23572
- First offense: 48 continuous hours
- Second offense: 10 days
- Third offense: 30 days
- Fourth offense (misdemeanor): 90 days
These stack on the underlying sentence. The statute leaves the judge no discretion to waive them.
The DMV Case Runs Separately
The court case and the DMV case are independent proceedings.14California Department of Motor Vehicles. Driving Under the Influence You can win in court and still lose your license, or the reverse. The DMV’s action, called Administrative Per Se (APS), starts automatically after an arrest with a failed or refused chemical test.
You have 10 days from the arrest to request an APS hearing.5California Department of Motor Vehicles. DUI First Offenders Alcohol Involved – Non-Injury 21 and Older Miss it and the suspension takes effect automatically 30 days after the arrest. The officer confiscates your physical license at the scene and issues a temporary license good for those 30 days.
For a first offense with a failed test, the APS suspension is four months. A first-offense refusal jumps to one year with no restricted license option. Suspension lengths increase with each subsequent offense and often overlap the court-ordered suspension.
Lower BAC Limits for Some Drivers
The 0.08% threshold isn’t universal. Commercial vehicle drivers violate the law at 0.04% or higher while operating a commercial vehicle.15California Legislative Information. California Code VEH 23152 Conviction brings the standard criminal penalties plus federal CDL disqualification: one year for a first offense, lifetime for a second.
Drivers under 21 face a zero-tolerance rule at 0.01% BAC. Any measurable alcohol triggers a one-year license suspension, whether or not the driver appears impaired.16California Legislative Information. California Code VEH 23136 Refusing the preliminary alcohol screening test brings a one- to three-year suspension. If the underage driver actually tests at 0.08% or above, full DUI penalties apply on top of the zero-tolerance consequences.
What a DUI Actually Costs
Base fines understate the bill. California layers penalty assessments, court fees, and surcharges on top of every base fine. A $390 base fine turns into roughly $1,800 or more. A $1,000 base fine lands well above $4,000. Exact totals vary by county because some local assessments are discretionary, but the multiplier holds statewide.
Ongoing costs then outrun the courtroom bill:
- SR-22 insurance is required for three years after a DUI, and premiums commonly rise by $1,000 to $3,000 a year compared to a clean record.
- IID installation runs $70 to $150, with monthly monitoring and calibration fees of $60 to $100. Six months costs $500 or more; a three-year requirement can exceed $4,000.
- The three-month first-offender program typically runs $500 to $700. An 18-month or 30-month program is $1,500 to $2,500 depending on provider and county.
Add lost wages from jail, towing and impound, and the license reinstatement fee, and a first DUI realistically reaches $10,000 or more. Repeat offenses push the total much higher.