A 4th DUI after 10 years is charged as a felony in nearly every state, and the ten-year figure matters because it points to the single question that most shapes your case: whether your older prior conviction still falls inside your state’s look-back window. If it does, you’re facing felony sentencing exposure that commonly includes mandatory prison time, a license revocation measured in years, a permanent federal firearms ban, and total costs that frequently land between $25,000 and $50,000. If the older prior falls outside the window, the same arrest may be charged as a third offense with substantially lower penalties. Everything else in your case sits downstream of that determination.
Whether Your Older Prior Still Counts
The “ten years” phrase refers to the look-back period, the window courts use to count prior convictions. Look-back rules vary significantly by state. Some use five years, many use ten, and several use a lifetime look-back, meaning every prior DUI counts no matter how long ago it happened. In a lifetime state, a decade-old conviction counts the same as one from last year.
How the window is measured is just as important as its length. Some states count from arrest date to arrest date. Others count from conviction date to conviction date. A few measure from the date you completed your sentence, which pushes older convictions further into the “current” window because probation and license revocation can add years to when the clock effectively starts. A conviction you assumed had aged out may still count depending on which of these methods your state uses.
This is the first thing a defense attorney examines, because moving a single prior outside the look-back period can reduce the charge from a fourth offense to a third. The sentencing difference between those two levels is usually enormous.
Felony Classification
A fourth DUI is treated as a felony in the vast majority of states. Only a small number of jurisdictions lack felony DUI statutes entirely, and the trend in state legislatures has been toward expanding felony DUI laws rather than narrowing them. The specific class varies: some states use Class D or Class E, others use third-degree felony, and the label sets the sentencing range the judge works within.
Some states require the priors to fall within a specific window for felony treatment to apply. States with lifetime look-backs charge a fourth DUI as a felony regardless of when the earlier convictions occurred.
Prison Time and Mandatory Minimums
Unlike a first or second DUI, where jail is often measured in days or weeks, a fourth offense regularly carries mandatory minimum prison sentences. Ranges vary by state, but mandatory minimums of one to three years in state prison are common, with maximums stretching to five, seven, or in some jurisdictions fifteen years. Judges usually have limited discretion to go below the mandatory minimum, so even strong mitigation arguments cannot eliminate prison time entirely.
Aggravating factors push the sentence higher:
- A blood alcohol concentration well above the legal limit, often 0.15% or higher, triggers enhanced penalties in many states.
- A child passenger in the vehicle adds charges or sentencing enhancements in most jurisdictions.
- An accident, especially one causing injury or death, can increase the sentence dramatically and may bring separate felony charges.
- Driving on a license already suspended from a prior DUI is treated as an independent aggravator.
After release, most states impose three to five years of probation with conditions far more restrictive than earlier offenses: mandatory sobriety, random alcohol and drug testing, and regular check-ins with a probation officer. Violating any condition can send you back to prison to finish the original sentence.
License Revocation
A fourth DUI conviction triggers license revocation measured in years. Many states impose revocations of five to ten years, and some authorize permanent revocation with only a narrow possibility of petitioning for reinstatement after a waiting period.
Getting your license back typically requires completing a substance abuse treatment program, paying all outstanding fines and fees, providing proof of high-risk insurance, and installing an ignition interlock device. Some states also require a formal hearing before a review board, where you must demonstrate sustained sobriety. During the revocation, many offenders qualify only for a restricted or hardship license limited to work, medical appointments, or court-ordered treatment.
Ignition Interlock
An ignition interlock is a breathalyzer wired into the vehicle’s ignition. You blow into it before the engine will start, and any detected alcohol prevents the car from turning over. All fifty states and the District of Columbia have interlock laws. For a fourth offense, the requirement is essentially universal and lasts significantly longer than for earlier convictions, often three to five years or more.
Federal law reinforces this. Under 23 U.S.C. § 164, states must either require repeat intoxicated drivers to use an interlock for at least one year or impose a hard license suspension of equal length to avoid losing a portion of their federal highway funding.1NHTSA. Model Guideline for State Ignition Interlock Programs Most states go well beyond that one-year federal floor for fourth-offense convictions.
Drivers typically pay an installation fee plus a monthly lease and calibration charge running roughly $70 to $105, not counting penalties for failed tests or missed calibrations. Over a multi-year interlock term, the total reaches several thousand dollars.
The Full Financial Picture
The court fine is only one line item. Fines commonly range from $2,000 to $10,000, and mandatory surcharges, court fees, and victim compensation assessments add hundreds or thousands more on top.
Beyond what the court orders, expect to pay for:
- The ignition interlock, $70 to $105 per month for the duration of the requirement.
- Substance abuse evaluation, typically $150 to $350, plus treatment that runs from a few thousand dollars for outpatient care to tens of thousands for inpatient programs.
- Continuous alcohol monitoring, if ordered, roughly $300 to $360 per month plus a $50 to $100 installation fee.
- High-risk auto insurance with premiums two to four times higher than what you paid before, often required for several years.
- Vehicle impoundment and daily storage fees accumulating from the date of arrest.
- License reinstatement fees when you become eligible, which vary widely.
Added together, the total cost of a fourth DUI frequently lands in the $25,000 to $50,000 range or higher across the full period of penalties, probation, and insurance surcharges. That figure doesn’t account for lost wages during incarceration or reduced earning power from a felony record.
Court-Ordered Treatment and Monitoring
Courts treat a fourth DUI as strong evidence of a serious alcohol problem, and sentencing reflects that. Judges almost always order participation in a substance abuse treatment program, and the required level of care is typically more intensive than what’s imposed after earlier convictions: a residential inpatient program lasting 30 to 90 days, intensive outpatient treatment with multiple weekly sessions, or a combination followed by ongoing aftercare.2PubMed Central. Court-Mandated Treatment for Convicted Drinking Drivers Completing treatment is almost always a condition of probation and a prerequisite for license reinstatement. Dropping out typically triggers a probation violation and a return to prison.
For monitoring, courts increasingly order continuous alcohol monitoring through ankle-worn devices that detect alcohol through the skin. These devices report results to probation officers in near real-time, and any positive reading is treated as a probation violation. Random urinalysis and breathalyzer testing at probation appointments supplements the electronic monitoring.
Loss of Firearm Rights
Because a fourth DUI is charged as a felony in nearly every state, conviction triggers the federal firearms prohibition. Under 18 U.S.C. § 922(g)(1), anyone convicted of a crime punishable by imprisonment for more than one year is banned from possessing, purchasing, or transporting any firearm or ammunition.3Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts A fourth DUI felony clears that threshold easily. The prohibition is permanent unless the conviction is expunged or the individual receives a presidential or gubernatorial pardon that specifically restores firearm rights. Violating the federal ban is itself a felony carrying up to fifteen years in prison.
Insurance and SR-22
Most standard insurers will either drop you outright or move you to a high-risk policy at two to four times your prior premium. Some carriers refuse renewal after a felony DUI, forcing you to specialty insurers at correspondingly steep rates.
Nearly every state requires proof of financial responsibility, usually an SR-22 certificate, after a DUI conviction. The SR-22 is a guarantee from your insurer to the state that coverage is active and meets minimum requirements. If your policy lapses, the insurer notifies the state, which can immediately re-suspend your license. For a fourth offense, the filing requirement may last several years, and in some states can extend for the rest of your driving life.
Collateral Consequences
A felony DUI conviction shows up on background checks for a long time. Employers in fields involving driving, heavy equipment, vulnerable populations, or security clearances are especially likely to screen you out, and even outside those fields many employers are reluctant to hire applicants with felony records. Landlords routinely run background checks as well, and some public housing programs restrict eligibility based on criminal history.
If you hold a professional license in a field like nursing, medicine, law, pharmacy, education, or commercial driving, licensing boards typically require you to report felony convictions. The board then evaluates whether the conviction reflects on your fitness to practice. For a fourth DUI, the pattern of repeated offenses makes a harsher outcome more likely, with consequences ranging from probationary conditions to outright license revocation.
For non-citizens, the stakes rise further. A single misdemeanor DUI generally does not trigger removal proceedings, but a felony conviction can. Immigration courts may classify a felony DUI, particularly one involving injury, very high BAC, or drugs other than alcohol, as a crime involving moral turpitude or an aggravated felony under federal immigration law. Either classification can lead to deportation, denial of naturalization, or bars to re-entry. A non-citizen facing a fourth DUI should consult an immigration attorney alongside criminal defense counsel, because a plea that resolves the criminal case favorably can still carry devastating immigration consequences.
Expungement Prospects
Felony DUI convictions are significantly harder to expunge than misdemeanor convictions, and many states do not allow expungement of felony DUIs at all. A handful of states permit it after a lengthy waiting period, typically five to ten years following completion of the sentence, and generally only if no injury or death was involved. Even where expungement is technically available, the process is discretionary and requires demonstrating sustained rehabilitation. For most people, the felony conviction will remain on their record permanently, which is why the collateral consequences above tend to be lifelong.
Why an Attorney’s First Move Is the Look-Back
Facing a fourth DUI without an experienced criminal defense attorney is a serious mistake. A skilled attorney’s first move is often to challenge whether all prior convictions properly count within the look-back period, because reclassifying the charge from a fourth offense to a third can dramatically reduce sentencing exposure. From there, attorneys examine whether the traffic stop was legally justified, whether field sobriety tests were administered correctly, and whether blood or breath samples were handled according to proper protocols. Procedural errors in any of these areas can lead to suppressed evidence or reduced charges.
Private defense attorneys for felony DUI cases typically charge between $5,000 and $25,000 or more depending on complexity and jurisdiction. If you cannot afford private counsel, you have a constitutional right to a court-appointed attorney in felony cases, with eligibility based on income thresholds that vary by state. The attorney’s ability to challenge the look-back count, contest the state’s evidence, and present mitigation at sentencing is where most of the leverage in a fourth-DUI case actually lives.