Auto insurance in Illinois: what’s required, and what isn’t
Illinois asks for more than most states. Alongside liability, every Illinois policy must carry uninsured motorist bodily injury coverage — it is not a decline-able extra — and the state verifies every registered vehicle electronically at least twice a year. The result is a market where the requirement is stricter than average, enforcement is automatic, and the price gap between Chicago and downstate is wide enough that state-level averages tell an individual driver almost nothing.
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What Illinois requires you to carry
| Bodily injury, per person | $25,000 |
|---|---|
| Bodily injury, per accident | $50,000 |
| Property damage, per accident | $20,000 |
Illinois also requires
- Uninsured motorist bodily injury
- Illinois requires uninsured motorist bodily injury coverage of at least $25,000 per person and $50,000 per accident on every policy. This is not optional and not something you can decline to save premium.
- Underinsured motorist, if you buy higher UM limits
- If you purchase uninsured motorist bodily injury limits above the statutory minimum, Illinois law requires the carrier to provide matching underinsured motorist coverage as well.
These are floors, not recommendations. Illinois sets the minimum a driver may legally carry. It does not assess whether that amount would cover a claim you caused. Anything above your limits is your personal exposure.
How Illinois enforces it
Illinois verifies coverage electronically. The Secretary of State checks each registered vehicle’s liability policy at least twice a year through a third-party vendor linked to every carrier writing vehicle liability in the state. A lapse surfaces without any roadside encounter, and the registration consequences follow from the database rather than from a ticket.
How rates are set in Illinois
Illinois is an at-fault state. The driver responsible for a crash is responsible for the resulting injury and property damage, and their liability limits cap what the insurer pays on their behalf.
Illinois is notable for how little it regulates price. The Department of Insurance reviews filings for compliance, but Illinois does not require prior approval of private passenger auto rates the way many states do. Carriers compete openly, which widens the spread between the best and worst quote for the same driver and makes shopping unusually productive here.
The statutory framework sits across two places worth knowing: 625 ILCS 5/7-601 compels liability coverage on every plated, driven vehicle, and 215 ILCS 5/143a-2 is what compels the uninsured motorist coverage and the underinsured matching rule.
Credit-based insurance scores in Illinois
Illinois permits credit-based insurance scores as a rating factor. Illinois is also one of the more heavily shopped auto markets in the country, and the range between carriers on how much weight credit carries is correspondingly wide.
What actually moves your premium here
Chicago and downstate are effectively two markets
The gap between Cook County and downstate Illinois is one of the widest intra-state spreads in the country. Traffic density, theft and vandalism frequency, uninsured-driver rates and repair costs all diverge sharply, and carriers rate by ZIP. A move within Illinois can change a premium more than a move between many other states would.
Mandatory UM coverage is already in your premium
Because Illinois compels uninsured motorist coverage, part of what looks like a high liability premium is actually UM. When comparing an Illinois quote against one from a state without the requirement, you are not comparing the same product.
The $20,000 property damage floor is the lowest of the three numbers
Illinois sets property damage at $20,000, below its own $25,000 bodily injury figure and below what several neighbouring states require. Against current vehicle values that is thin, and property damage is the limit most commonly exhausted in an ordinary at-fault collision.
Uninsured motorist property damage carries a capped deductible
Where uninsured motorist property damage coverage is offered in Illinois, the law requires it be available with a deductible no higher than $250. It is a small detail that materially changes whether the coverage is worth carrying.
See what you’d be matched with in Illinois
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Comparing carriers in Illinois
Check that every Illinois quote you compare actually includes the mandatory uninsured motorist limits. A quote that appears to undercut the others is sometimes quoting a configuration that would not be issuable, and the difference disappears at bind.
Illinois supports a deep bench of regional carriers and mutuals alongside the national names, and usage-based programmes are widely available. For a low-mileage Chicago driver in particular, the spread between a mileage-rated programme and a conventional policy can be substantial.
One habit matters more than any single carrier choice: re-check every year or two, and again after anything that changes your risk profile — a move across town, a new vehicle, a driver added or removed, or a violation ageing off your record. Carriers re-weight their rating factors continuously, so the one that priced you best three years ago is often not the one that prices you best today.
If you need an SR-22 in Illinois
Illinois requires an SR-22 filing under its Safety and Financial Responsibility Law after certain suspensions, including being uninsured in a crash and DUI-related suspensions. The filing is made by your insurer with the Secretary of State, and the policy cannot be cancelled without notice to the state. Confirm the filing period that applies to your specific case with the Secretary of State before buying, since it runs from the reinstatement date.
Illinois auto insurance FAQ
- What is the minimum car insurance required in Illinois?
- Liability coverage of at least $25,000 per person and $50,000 per accident for bodily injury, plus $20,000 for property damage. Illinois additionally requires uninsured motorist bodily injury coverage of at least $25,000 per person and $50,000 per accident on every policy.
- Is uninsured motorist coverage required in Illinois?
- Yes. Unlike most states, Illinois compels uninsured motorist bodily injury coverage — you cannot decline it. If you buy UM limits above the minimum, the carrier must also provide matching underinsured motorist coverage.
- How does Illinois check whether I have insurance?
- Electronically. The Secretary of State verifies each registered vehicle’s liability policy at least twice a year through a vendor linked to every carrier writing vehicle liability in Illinois. A lapse can surface without any traffic stop.
- Why is car insurance so much more expensive in Chicago than downstate?
- Carriers rate by garaging ZIP, and the underlying loss costs genuinely differ — traffic density, theft and vandalism frequency, uninsured-driver rates and repair labour costs are all higher in the Chicago metro. The intra-state spread in Illinois is among the widest in the country.
- Is Illinois an at-fault or no-fault state?
- Illinois is an at-fault state. The driver who caused the crash is responsible for the resulting damage, and their liability coverage pays up to the policy limits.
Sources
Requirements on this page were verified against Illinois’s own regulator and motor vehicle agency on the date shown at the top. Rules change — if you are making a decision that turns on an exact figure, confirm it at the source.
- Illinois Secretary of State — Mandatory insurance
- Illinois Secretary of State — Safety and Financial Responsibility Law
- Illinois DOI — Auto insurance shopping guide
Consumer help in Illinois: Illinois Department of Insurance, (866) 445-5364.