New Jersey Criminal Law Monograph · Drunk Driving
New Jersey DWI Penalties, Fines and Interlock Requirements
A New Jersey DWI is not a crime. It is a traffic offense, heard in Municipal Court, decided by a judge rather than a jury. That sounds like good news until you read the penalties: loss of your license, thousands of dollars in fines and surcharges, an ignition interlock, and a mandatory stay at an Intoxicated Driver Resource Center. There is also a second charge waiting alongside it — refusal — that many drivers do not see coming.
This page lays out both charges, the penalties by blood alcohol concentration and by how many priors you have, and what it actually costs when you add up the surcharges, fees, and insurance consequences that never appear on the face of the statute.
01 What Drunk Driving Is Under New Jersey Law
Under N.J.S.A. 39:4-50(a) , a person is guilty of drunk driving if they operate a motor vehicle while under the influence of intoxicating liquor, or with a blood alcohol concentration of 0.08% or more. It also covers operating a vehicle while under the influence of a narcotic, hallucinogenic, or habit-producing drug.
New Jersey is unusually broad about the word “operate.” The car does not need to be moving.
By the numbers
A breath (Alcotest) or blood reading of 0.08% or more. When the State has a valid reading, it does not have to show that you drove badly.
By observation
“Under the influence” shown by how you were driving, your speech, the odor of alcohol, your performance on field sobriety tests, and your statements. No reading is needed — this is how drug DWIs are proved.
What “operate” means
Behind the wheel, engine running, with intent to drive can be enough. The car does not have to be in motion.
Three things worth knowing before anything else:
Heard in Municipal Court
A traffic offense, not a crime.
No jury
A judge decides, not a jury.
Proof beyond a reasonable doubt
The State still has to meet the criminal standard, even in Municipal Court.
One more provision catches people by surprise: it is also a violation to allow an intoxicated person to drive your car. The charge can land on the owner, not just the driver.
02 DWI and Refusal Are Two Separate Charges
After a DWI arrest, the law requires you to give breath samples. Refusing is its own charge, and you can be convicted of it even if you are found not guilty of the DWI . The two charges are proved differently, punished differently, and they stack.
| Driving while intoxicated N.J.S.A. 39:4-50 | Refusal N.J.S.A. 39:4-50.4a | |
|---|---|---|
| The charge | Driving intoxicated or at 0.08% or more. | Refusing to give breath samples after a DWI arrest. |
| What the State must prove | You operated a vehicle while under the influence, or with a BAC of 0.08% or more. | Probable cause that you drove under the influence, an arrest, a request for samples, and your refusal. |
| Standard of proof | Beyond a reasonable doubt for both. State v. Cummings, 184 N.J. 84 (2005) (refusal). | |
| First-offense penalty | Fine of $250 to $500 and an interlock for 3 to 15 months, depending on BAC. License loss up to 3 months at 0.15% or more. | Fine of $300 to $500. License lost until an interlock is installed, then interlock for 9 to 15 months. |
| Convicted of both? | Yes, you can be. First offense: the suspensions may run together. Second or later: the refusal suspension runs after the DWI suspension. One MVC surcharge per arrest. | |
No lawyer at the breath test
There is no right to call a lawyer first. “Not until I talk to my lawyer,” or anything short of a clear yes, can count as a refusal.
Refusing does not stop a DWI case
The State can still prove DWI by observation, and the refusal itself can be used as evidence at the DWI trial.
03 DWI Penalties by Blood Alcohol Concentration and Priors
The chart below is the statutory penalty structure under N.J.S.A. 39:4-50 and N.J.S.A. 39:4-50.17 . The first three columns are first offenses, separated by blood alcohol concentration. The last two are repeat offenses.
| 0.08–0.099% or “under the influence” | 0.10–0.149% | 0.15% or more | Second offense | Third or later | |
|---|---|---|---|---|---|
| Fine | $250–$400 | $300–$500 | $300–$500 | $500–$1,000 | $1,000 |
| Jail | Up to 30 days, in the judge’s discretion | 48 hours min., up to 90 days | 180 days (90 may be rehab) | ||
| License loss | Only until an interlock is installed | 3 months or interlock (see 07) | 1 to 2 years or interlock (see 07) | 8 years or interlock (see 07) | |
| Ignition interlock | 3 months | 7 to 12 months | During suspension + 12 to 15 months | During suspension + 2 to 4 years | |
| IDRC & service | 12 to 48 hours over two consecutive days at an Intoxicated Driver Resource Center | IDRC + 30 days community service | IDRC program | ||
Drugs, first offense: $300–$500 fine, IDRC, and license loss of 7 months to 1 year. 10-year rule: a second offense more than 10 years after the first is sentenced as a first offense; a third more than 10 years after the second is sentenced as a second. Out-of-state DWI convictions count as priors.
04 Refusal Penalties
Refusal carries its own penalty ladder. A prior DWI counts as a prior for refusal. N.J.S.A. 39:4-50.4a .
| Fine | License | Interlock | |
|---|---|---|---|
| 1st | $300–$500 | Until installed | 9 to 15 months |
| 2nd | $500–$1,000 | 1–2 yrs after install | During + 2–4 yrs |
| 3rd+ | $1,000 | 8 yrs after install | During + 2–4 yrs |
05 What It Costs Beyond the Fine
The fine is the smallest number on the page. Here is the rest of the bill, which is where a DWI gets expensive.
| Item | Cost |
|---|---|
| MVC insurance surcharge | $1,000 per year for 3 years, and $1,500 a year for a third offense within 3 years |
| DWI surcharge and Alcohol Education fee | $125 + $100 |
| IDRC fees, per day | $75 / $100 |
| Interlock lease, plus installation | $70–$100 per month, plus $100–$200 to install |
Plus court costs and higher insurance premiums. Interlock fees are reduced for low-income drivers.
06 The Interlock: A Way to Keep Driving
The ignition interlock is the one piece of a DWI sentence that works in your favor — if you use it correctly. Under N.J.S.A. 39:4-50(a) :
The benefits, even on a second offense
Two days with an interlock equals one day of suspension.
Time served before conviction counts.
If your New Jersey license was valid and stayed in good standing.
Not available for drug DWIs or cases with serious bodily injury.
Caution: refusal is different
- The 2-for-1 credit is in the DWI statute , not the refusal statute.
- A 2nd or 3rd refusal suspension starts after installation; the interlock may not shorten it.
- On a 2nd or later offense it also runs after the DWI suspension.
Talk to us before counting on an interlock to cut refusal time.
Do not drive while suspended
On a second or later DWI or refusal suspension, driving while suspended is a 4th-degree crime with 180 days mandatory . 2C:40-26(b) .
07 Where to Find Us
If you have been charged with a DWI, a refusal, or a related traffic offense anywhere in Mercer, Ocean, Burlington, or Middlesex County, call us. Criminal and municipal matters get a free initial consultation.
3500 Quakerbridge Road, Suite 202
Hamilton, NJ 08619
609-853-5579
29 Hadley Avenue
Toms River, NJ 08753
732-475-4740
Free case evaluation
Free for criminal, DWI, and municipal matters. Schedule one at kmhldlaw.com/contact , or call 609-853-5579 .
Related pages on this site:
- New Jersey DUI/DWI Defense — how we defend these charges
- New Jersey Criminal Defense — the full range of criminal matters we handle
- Contact Hartman Duff, LLC
General information only, not legal advice. This page summarizes New Jersey law as of September 2026; statutes and penalties change, and every case turns on its own facts. Hartman Duff, LLC · Hamilton (609) 853-5579 · Toms River (732) 475-4740.