§ I
How to Use This Tool
The wizard asks five questions, in order, because that's the order a courtroom would ask them. Step I — your state of arrest — sets the statutory baseline. Every other input acts as a multiplier or a flat additive on top of that floor. Step II selects your offense tier; if you have any prior DUI within the state's "lookback" period (anywhere from 5 years in Maryland to lifetime in Massachusetts), this is a second offense, not a first. Step III captures your BAC — most state DUI statutes split sentencing at 0.15 and again at 0.20, and a chemical-test refusal triggers a separate civil suspension under implied-consent law. Step IV accounts for the two aggravators that most commonly reclassify a misdemeanor DUI as a felony: presence of a minor in the vehicle, and causing injury. Step V chooses your representation. The output is an itemized bill — fines, court costs, attorney fees, ignition interlock device (IID) lease, three-year SR-22 insurance surcharge, alcohol education, victim impact panel, license reinstatement, and the smaller costs people forget (towing, bail bond, drug testing).
§ II
Why the Real Number Matters
Search "how much does a DUI cost" and you'll find a wall of legal-marketing pages that quote "$10,000 to $25,000" without ever showing the math. That range is real — but the variance is doing all the work, and the variance is what you can actually plan around. A first-offense, BAC-0.10, no-priors, no-injury DUI in Indiana with a public defender lands closer to $4,500 all-in. The same arrest in Texas, where the state surcharge alone is up to $3,000, with a private attorney and a high BAC, easily clears $20,000 before insurance.
The single biggest line item for most people is not the fine. It's the three-year insurance surcharge. NerdWallet's 2026 rate-comparison data puts the national average post-DUI premium increase at 88% — an extra $183 per month or about $2,200 per year. Multiply by three years (typical SR-22 duration) and you're looking at $6,500–$7,000 in elevated premiums alone. That dwarfs most state fines and rivals the cost of private counsel. People who shop their post-DUI insurance aggressively — moving from a traditional carrier to a high-risk specialist like Direct General or The General — can cut that line item in half. People who don't, can't.
The second-largest hidden cost is the ignition interlock device. Thirty-two states now require an IID on first-offense convictions; the rest require one at BAC 0.15+ or on second offense. The device itself runs $70–$150 to install, $50–$120 per month to lease, and $60 to remove. Add in periodic calibration visits, occasional missed-call fees, and the indignity of blowing into a tube every time you start your car for six to eighteen months, and you've added another $1,200–$2,400 to the ledger.
§ III
What This Calculator Does Not Capture
The output bill is what you pay in cash, to people you write checks to. It does not include the larger structural costs that often dwarf the bill itself:
- Lost wages. Some states require minimum jail time on first offense (Arizona: 1 day; Colorado: 5 days mandatory). Beyond jail, court appearances, IID installation visits, and required classes routinely cost 80–120 hours of work time over the first year. At a $30/hr wage that's another $3,000+.
- Job loss. Some employers — particularly transportation, healthcare, education, government, finance — terminate on conviction. The replacement-job search has its own cost.
- Professional license impact. DUIs are reportable to nursing boards, bar associations, medical boards, real estate commissions, and FAA. Many require self-reporting within 30 days. A discipline action can end a career.
- Child custody. A DUI conviction (especially with a minor in the vehicle) commonly triggers a family-court review of custody arrangements.
- Immigration status. A single misdemeanor DUI is generally not deportable but can affect naturalization "good moral character" findings. Felony DUI, aggravated DUI, or multiple convictions are different — see the FAQ below.
- Future insurance baseline. Even after the three-year SR-22 expires, a DUI on your record can elevate premiums for 5–10 years total.
§ IV
Things to Watch For
Three mistakes account for most of the avoidable cost overruns we see in DUI defense intake:
- Using a public defender on a complex case. Public defenders are competent — overworked, but competent — and on a simple BAC-0.10, no-priors, no-injury case, the outcome is often statistically similar to a private attorney's. But on cases with chemical-test challenges, breath-machine maintenance defects, prior priors that should be off the record, or aggravators in dispute, a $5,000 private attorney commonly saves $15,000+ in collateral cost.
- Missing the IID compliance window. Most states require IID installation before license reinstatement; missing a calibration appointment or accumulating violation events resets your clock. People routinely end up paying for an extra 3–6 months of lease they didn't owe.
- Not enrolling in alcohol classes immediately. Almost every state mandates an alcohol education or DUI school program (often 12–30 hours), and most require completion before reinstatement. Waiting until after sentencing pushes your license-back date out, often into the period where you're paying for IID and SR-22 on a license you can't use yet.
§ V
FAQ — Eight Things People Actually Ask
How long does a DUI stay on my insurance?
Insurance surcharges typically last 3–5 years, but the underlying conviction can affect premiums for up to 10 years depending on state and insurer. The national average premium increase is about 88% for full coverage — roughly $2,200 extra per year. Shopping aggressively after the SR-22 period ends often shaves a third off.
What is SR-22 insurance and do I have to get it?
SR-22 (FR-44 in Florida and Virginia) is a state-mandated financial responsibility certificate filed by your insurer proving you carry minimum liability coverage. Most states require it for 3 years after a DUI before your license is reinstated. The filing fee itself is small ($15–$50) but the underlying high-risk policy is significantly more expensive.
Can I get the ignition interlock device waived?
A handful of states allow first-offense, low-BAC drivers to petition out of an IID, but most states (32+ as of 2026) require an IID for any DUI conviction. Some states offer income-based financial assistance through state-administered IID indigency funds — ask the court at sentencing.
Is BAC 0.05 a DUI in any state?
Yes. Utah lowered its per se BAC limit to 0.05 in 2018 — the strictest in the U.S. All other states currently set the per se limit at 0.08 for non-commercial drivers age 21+. Drivers under 21 face zero-tolerance limits (0.00–0.02 BAC) in every state.
What's the difference between DUI, DWI, and OWI?
The terms are synonymous in practice but vary by state. DUI (driving under the influence) is the most common. DWI (driving while intoxicated/impaired) is used in Texas, New York, and others. OWI (operating while intoxicated) appears in Indiana, Iowa, Michigan, and Wisconsin. OUI is used in Maine and Massachusetts. Penalty structures are similar across labels.
Can I refuse the breathalyzer test?
All 50 states have implied-consent laws — refusing a breath, blood, or urine test after a lawful arrest triggers automatic license suspension (typically 1 year for a first refusal), and in many states, harsher criminal penalties at sentencing. Roadside preliminary breath tests (PBTs) can sometimes be refused without administrative consequence, but post-arrest evidentiary tests cannot.
Will a DUI affect my CDL?
Yes — federal law (49 CFR §383.51) imposes a 1-year disqualification of a commercial driver's license for a first DUI in any vehicle (personal or commercial) and a lifetime disqualification for a second offense. A CDL holder's BAC limit while operating a commercial vehicle is 0.04, half the standard.
Can a DUI affect my immigration status?
A single misdemeanor DUI is generally not a deportable offense for lawful permanent residents, but DUIs involving injury, multiple convictions, or felony DUI can trigger removal proceedings. USCIS also considers DUI convictions when assessing "good moral character" for naturalization. Non-citizens charged with DUI should consult an immigration attorney before pleading.
§ VI
Sources
- National Highway Traffic Safety Administration (NHTSA), Alcohol-Impaired Driving Reports, 2024–2025. nhtsa.gov
- National Conference of State Legislatures (NCSL), State DUI/DWI Laws. ncsl.org
- Insurance Institute for Highway Safety (IIHS), DUI/DWI laws as of 2026. iihs.org
- ValuePenguin, How Does a DUI Affect Auto Insurance Rates, 2026. valuepenguin.com
- NerdWallet, Insurance after a DUI: state averages, 2026.
- Intoxalock and LifeSafer published IID pricing schedules, accessed 2026-05. intoxalock.com · lifesafer.com
- Individual state DMV / Department of Public Safety penalty schedules (linked from the state field in the data file).
- Mothers Against Drunk Driving (MADD), State-by-state cost calculator framework. madd.org
- FindLaw, State-by-State DUI Penalties. findlaw.com
- U.S. Department of Transportation, Commercial Driver Disqualifications, 49 CFR §383.51.
All figures are estimated midpoints intended for educational planning. Statutory penalties change. Actual sentencing varies. This page is informational research and does not constitute legal advice. If you face an active DUI charge, retain a licensed defense attorney in your state of arrest.