New DUI Laws in Illinois: BAC Limits, MDDP, and SR-22

An Illinois DUI arrest sets two separate processes in motion: an automatic license suspension that starts 46 days after the arrest regardless of what happens in court, and a criminal case that can end in a misdemeanor or felony conviction. Understanding Illinois DUI penalties and license suspension means tracking both tracks — the administrative hit to your driving privileges and the criminal sentence — because they run on different clocks and carry different consequences.

The Statutory Summary Suspension

Every driver on Illinois roads has, by law, already consented to chemical testing if arrested for DUI.¹ When you’re arrested, the officer warns you that refusing the test triggers an automatic suspension and, if you hold a commercial license, a disqualification. If a crash involved injury or death, refusal produces a revocation rather than a suspension.

This administrative penalty is called the Statutory Summary Suspension (SSS). It begins on the 46th day after you receive written notice, whether or not the criminal DUI case has been resolved.¹ The length depends on what you did during the stop:

First offender, BAC of 0.08 or higher: six months.
First offender who refused testing: 12 months.

You can request a hearing to challenge the suspension, but filing does not pause it.² The clock keeps running.

BAC Limits and Criminal Penalties by Offense

For non-commercial drivers 21 and older, the legal BAC limit is 0.08%.³ Commercial drivers face a stricter 0.04%. The criminal penalties escalate sharply with each conviction:

First offense: Class A misdemeanor, up to one year in jail, maximum fine of $2,500.³
Second offense: Class A misdemeanor with a mandatory minimum of five days in jail or 240 hours of community service.³
Third offense: Class 2 felony, three to seven years in prison, fines up to $25,000.³⁴
Fourth offense: Also a Class 2 felony, but probation and conditional discharge are no longer available as sentencing options.³

The jump from misdemeanor to felony at the third offense is where the sentence structure changes fundamentally.

Enhanced Penalties for High BAC and Child Passengers

A BAC of 0.16 or higher stacks additional mandatory penalties on top of the base sentence at every tier: 100 hours of community service and a $500 fine on a first offense, two mandatory days in jail plus $1,250 on a second, 90 mandatory days of imprisonment plus $2,500 on a third, and a $5,000 fine on a fourth.³

Driving under the influence with a child under 16 in the car adds a mandatory $1,000 fine and 25 days of community service in a program benefiting children, layered onto whatever else the sentence contains.³

Driving During the Suspension: The MDDP

A first-offender suspension does not mean six or twelve months without a car. The Monitoring Device Driving Permit (MDDP) lets qualifying first offenders drive anywhere, any time, provided the vehicle has a Breath Alcohol Ignition Interlock Device (BAIID) installed.⁵ The MDDP is available even if you refused chemical testing.

You cannot get an MDDP if:

Your license is otherwise suspended, revoked, or expired for a separate reason.
The DUI arrest involved a crash causing death or great bodily harm.
You have a prior conviction for reckless homicide or aggravated DUI involving death.
You are under 18.

One rule that surprises people: an MDDP holder cannot drive a commercial motor vehicle at all, interlock or not.⁵

What the Interlock Costs and Requires

You have 14 days from the date the Secretary of State issues the MDDP to get the BAIID installed on every vehicle you drive. In that window you may drive without the device, but only to reach an installer. If installation isn’t confirmed to the Secretary of State, the MDDP is canceled.⁵

Costs come from two directions. A state-certified vendor charges for installation and a monthly lease, and the amount varies by provider. Separately, you owe the Secretary of State a $30-per-month administration fee for the remaining months of the suspension, and this fee is paid as a single lump sum before the MDDP is issued.⁶ For a six-month suspension that is roughly $180 upfront; for a 12-month refusal suspension, closer to $360.

The BAIID demands a breath sample before the engine starts and at random intervals while you’re driving. Failed samples, tampering, and bypass attempts are reported to the Secretary of State and can extend the suspension. Drivers certified as indigent by the Secretary of State get installation and maintenance at no cost from the vendor, who is reimbursed through the Indigent BAIID Fund, though the $30 monthly administrative fee still applies.⁵

Driving on a DUI Suspension Without a Permit

Getting caught driving on a suspended license is normally a Class A misdemeanor. When the suspension is a DUI-based SSS, the floor rises: a mandatory minimum of 10 consecutive days in jail or 30 days of community service, and that mandatory sentence cannot be suspended or reduced.⁷

The harshest version applies to first offenders who were eligible for an MDDP and chose to drive without one. That is a Class 4 felony.⁷ Skipping the interlock and hoping not to be pulled over is one of the more expensive gambles in Illinois traffic law.

Reinstatement and SR-22 Insurance

The license does not come back on its own when the suspension ends. You pay a reinstatement fee to the Secretary of State: $250 for a first DUI, $500 if you have priors. Any other outstanding suspensions or revocations must be cleared first.⁸

You also have to file proof of financial responsibility — an SR-22 — with the Secretary of State. That is a certificate from your insurer confirming at least the state minimum coverage. The SR-22 must be maintained for three years, and you have to renew it at least 45 days before it expires. If it lapses or is canceled, your insurance company notifies the Secretary of State and your license is suspended again until coverage is restored.⁹ Premiums climb noticeably during that three-year window. A cash-or-securities deposit of $70,000 with the Illinois State Treasurer is a legal alternative, but rarely used.

Commercial Drivers

A CDL magnifies every consequence. A first DUI conviction while operating a commercial vehicle brings at least a one-year federal disqualification from commercial driving; if hazardous materials were involved, the minimum is three years. A second DUI conviction is a lifetime commercial driving disqualification.¹⁰

These federal disqualifications reach further than most CDL holders expect: they apply when a CDL holder is convicted of DUI in a personal vehicle too, not only in a commercial one.¹⁰ A weekend DUI in a family car can end a commercial driving career.

Drivers Under 21

Illinois runs a zero-tolerance rule for anyone under 21. If a breath or blood test shows any detectable alcohol above 0.00, the officer submits a sworn report and a suspension takes effect on the 46th day.¹¹ Refusing the test carries the same result. The only recognized exceptions are alcohol consumed during a religious ceremony and trace amounts from a prescribed medication taken at the recommended dose.

1
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/11-501.1 – Statutory Summary Suspension or Revocation
2
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/2-118.1 – Opportunity for Hearing, Statutory Summary Suspension or Revocation
3
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/11-501 – Driving Under the Influence
4
Illinois State Police. Impaired Driving
5
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/6-206.1 – Monitoring Device Driving Permit
6
Illinois General Assembly. Illinois Administrative Code 92-1001.444 – Monitoring Device Driving Permit Provisions
7
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/6-303 – Driving While License Suspended or Revoked
8
Illinois Secretary of State. Reinstatement of Driving Privileges
9
Illinois Secretary of State. Financial Responsibility (SR-22) Insurance
10
Office of the Law Revision Counsel. 49 USC 31310 – Disqualifications
11
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/11-501.8 – Suspension of Drivers License, Persons Under 21