Car insurance in Illinois

What Illinois law requires you to carry

Every vehicle registered in Illinois has to be covered by a liability policy before it is driven on public roads. The state's floor is written as 25/50/20:

• $25,000 for bodily injury to any one person in a crash you cause
• $50,000 total for bodily injury per crash, no matter how many people are hurt
• $20,000 for damage to other people's property per crash

On top of that, Illinois requires uninsured motorist (UM) bodily injury coverage of at least 25/50 on every auto policy. That part covers you and your passengers when the at-fault driver has no insurance at all, or in a qualifying hit-and-run.

Illinois does not require personal injury protection (PIP). Medical payments coverage is optional and sold separately.

Two things worth being blunt about. First, these limits are a legal minimum, not a recommendation — a single hospital stay or a late-model SUV can blow past $25,000 or $20,000 quickly, and you are personally on the hook for the difference. Second, liability and UM cover other people and injuries; nothing in the state minimum repairs your car. For that you need collision and comprehensive, which are optional in Illinois unless a lender or lessor requires them.

For context on what drivers actually spend, the NAIC's 2023 countrywide data puts the average Illinois expenditure — liability plus collision plus comprehensive, per insured vehicle — at about $1,257 a year ($1,256.58). That is an average across all drivers, vehicles and coverage choices, not a quote, and your own figure can land well above or below it.

Fault, claims and how the money actually moves

Illinois is an at-fault (tort) state. The driver who caused the crash — through their insurer — pays for the other side's injuries and property damage. There is no no-fault system and no PIP, so there is no automatic first-party injury payment the way there is in Michigan or Florida.

In practice that gives an injured driver three routes:

1. Claim against the other driver's liability insurer (a third-party claim). You have to establish they were at fault, and their payout is capped by their limits.
2. Claim on your own policy — collision for your car damage, medical payments if you bought it, UM/UIM for injuries when the other driver has no or too little coverage. Your insurer may then pursue the at-fault carrier for reimbursement and refund your deductible if it recovers.
3. A lawsuit, when liability is disputed or the damages exceed what the insurer will pay.

Illinois uses modified comparative negligence: your recovery is reduced by your share of the blame, and if you are more than half at fault you recover nothing from the other driver. Adjusters know this and will argue percentages, so documentation matters — photos of both vehicles and the scene, the police report number, names and numbers of witnesses, and dated records of medical treatment.

Practical habits that protect a claim: report the crash to your own insurer promptly even if you believe the other driver was entirely at fault; do not give a recorded statement to the other side's adjuster before you understand your injuries; get your own repair estimate rather than accepting the first number; and never sign a release until you know the full extent of medical treatment, because a release ends the claim for good.

Optional coverage that earns its keep in Illinois

Underinsured motorist (UIM). This is the gap most Illinois drivers miss. UIM is not mandatory when you buy the state minimum — it becomes required only once your liability limits exceed 25/50. So the drivers who buy only the floor are the ones with no protection against a driver whose limits are too small to cover their injuries. Buying higher liability limits brings matching UIM along with it, which is one of the better arguments for not buying the minimum.

Higher liability limits. Moving up from 25/50/20 is usually the cheapest meaningful upgrade on a policy, because the severe-claim layer is statistically rare. It is also what stands between a bad crash and your wages and savings.

Collision and comprehensive. Collision pays for your car in a crash regardless of fault; comprehensive covers theft, hail, flood, fire, vandalism and animal strikes. Illinois sees real hail and winter-weather damage, and deer collisions are common downstate and in the collar counties — those are comprehensive claims, and comprehensive claims generally do not carry the same surcharge weight as at-fault collisions.

Medical payments (MedPay). With no PIP in Illinois, MedPay is the small no-fault bucket that pays deductibles, co-pays and ambulance bills for you and your passengers quickly, before fault is sorted out.

Gap coverage if you owe more than the car is worth, rental reimbursement if being without a car would be a real problem, and roadside assistance if you do not already have it through a motor club or credit card.

A deliberate choice worth making: raise your collision and comprehensive deductibles if you can absorb the hit, and put the savings into higher liability and UM/UIM limits. That trades small, survivable losses for protection against the catastrophic one.

Rules and habits Illinois drivers trip on

Assuming the minimum is "full coverage." It is not. 25/50/20 plus UM pays other people. Your own vehicle is uncovered until you add collision and comprehensive.

Skipping UIM by buying the floor. Because UIM only kicks in as a requirement above 25/50, minimum-limit buyers are doubly exposed: low protection for others, and none for themselves against an underinsured driver.

Letting coverage lapse between policies. Illinois ties insurance to the registered vehicle, and proof of insurance is expected whenever you are asked for it. Enforcement and penalties for uninsured operation are administered by the Illinois Secretary of State — check their mandatory insurance page for the current consequences and the steps to clear a suspension. A lapse also tends to follow you into the next policy as a rating factor.

Not knowing that credit history is in the mix. Illinois permits insurers to use credit-based insurance scores as one rating factor. It is not your lending credit score, and insurers do not all weigh it the same way, but it is one more reason that quotes for identical coverage can differ sharply between companies and why it pays to shop rather than assume.

Forgetting the permissive-driver question. Policies generally follow the car, but household members who drive regularly should be listed. An undisclosed regular driver is a predictable source of claim friction.

Treating renewal as automatic. Rating factors, discounts and vehicle values change. Re-shopping at renewal, with your current declarations page in hand so you compare identical limits and deductibles, is the single most reliable way to control what you pay.

Losing the paper trail. Keep your claim number, the adjuster's name, and written confirmation of anything agreed by phone. If a dispute later goes to the regulator, that file is your case.

If your insurer gets it wrong: complaining to the Illinois Department of Insurance

The Illinois Department of Insurance (IDOI) regulates insurers and producers in the state and takes consumer complaints about claim handling, delays, denials, cancellations and nonrenewals.

Step one is your insurer. Put the dispute in writing, ask for the specific policy language and the reason for the decision, and use the company's internal appeal or supervisor review. Many disputes end here once someone senior reads the file.

Step two is IDOI. The Department runs an online IDOI Help Center where you can register an account and submit a complaint electronically, and it also publishes downloadable complaint forms you can email or mail — for a car claim, the Auto/Home/Property/Commercial complaint form, which is available in English and Spanish. There is also an appointment-of-authorized-representative form if someone is filing on your behalf.

What to send: your policy number and claim number, the dates and a short chronology of what happened, copies of the denial or settlement letter, your estimates or medical bills, and the specific outcome you are asking for. Keep the narrative factual and in order; the Department contacts the insurer for a formal response and reviews it against the policy and Illinois insurance law.

What it can and cannot do. IDOI can press an insurer to explain or correct its handling and can act on conduct that breaks state law. It is not a court — it does not decide contested questions of fault or award damages. If your disagreement is about how much your injury claim is worth, that is a matter for negotiation or litigation, and a lawyer is the right call.

Contact: idoi.illinois.gov; Illinois Department of Insurance, 115 S. LaSalle Street, 13th Floor, Chicago, IL 60603, (312) 814-2420; or 4800 Wabash Avenue, Springfield, IL 62711, (217) 782-4515.

How to shop a policy in Illinois without wasting money

Start by fixing your coverage shape before you look at any price:

1. Pick liability limits above 25/50/20 if you have any assets or income to protect — and note that going above the minimum is what makes UIM part of your policy.
2. Set your UM/UIM to match your liability limits. Mismatched limits are a common and avoidable gap.
3. Decide on collision and comprehensive based on what the car is worth to you and whether you could replace it out of pocket.
4. Choose deductibles you could actually pay tomorrow, not the lowest ones available.

Then compare at least three carriers on that identical structure. Quotes only mean something when the limits, deductibles and optional coverages are the same line for line — a cheaper number attached to thinner coverage is not a saving.

Ask explicitly about discounts you may already qualify for: multi-policy, multi-vehicle, safe-driver, good-student, paid-in-full, paperless, defensive-driving courses, low annual mileage and vehicle safety features. Telematics or usage-based programs can help low-mileage and steady drivers, but read how the data is used and whether rates can rise, not just fall.

Before you buy, check the company and the agent through IDOI's Company Lookup and Agent Lookup tools to confirm they are licensed to do business in Illinois. And re-run this exercise every year or two, or whenever you move, change vehicles, add a driver or pay off a car loan — those are the moments when both your needs and your rate change.