Multi-Car Liability Requirements in Illinois
Illinois requires every vehicle on a multi-car policy to carry $25,000 bodily injury per person, $50,000 bodily injury per accident, and $20,000 property damage—the 25/50/20 liability minimum. The state also mandates uninsured motorist coverage. Illinois is a fault state, so the at-fault driver's liability pays the other party's damages. The multi-car discount applies when every vehicle sits on the same policy and typically shares a garaging address.
Meeting the state minimum keeps you legal. See whether it's enough — get your Illinois quote.
Get your Illinois quoteWhat Shapes Multi-Car Costs in Illinois
Multi-car cost in Illinois depends on the vehicles you insure, the drivers on the policy, the coverage level you select per vehicle, and the multi-car discount. Illinois's average annual auto insurance expenditure per insured vehicle was $863.96 in 2023. Carriers writing in Illinois—including State Farm, Geico, Progressive, Allstate, Farmers, and Liberty Mutual—calculate the discount based on the number of vehicles and whether they share a garaging address.
What Affects Your Rate
- Illinois's 25/50/20 liability minimum is the floor every vehicle on a multi-car policy must carry; raising limits on any vehicle increases that vehicle's portion of the premium.
- The multi-car discount in Illinois typically requires every vehicle on the same policy and the same garaging address; carriers like State Farm and Geico writing here give the discount when you add a second vehicle.
- Illinois's 15.2% uninsured motorist rate as of 2023 makes uninsured motorist coverage mandatory; this coverage adds to the base premium for every vehicle on a multi-car policy.
- Adding collision and comprehensive to any vehicle on a multi-car policy raises that vehicle's cost; each vehicle that carries physical-damage coverage has its own deductible.
- Illinois's 303.1 motor vehicle thefts per 100,000 population in 2024 affect comprehensive premiums for vehicles garaged in higher-theft areas; the multi-car discount applies on top of the theft-adjusted base rate.
- Carriers writing in Illinois calculate the multi-car discount differently—some give a larger discount on the second vehicle, others spread the discount evenly across all vehicles on the policy.
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Get Your Free QuoteCoverage Types
Multi-Car Policy Structure
A multi-car policy puts two or more owned vehicles on one Illinois policy, each carrying at least the 25/50/20 liability minimum, and earns the multi-car discount when every vehicle shares the policy and typically the same garaging address.
Adding a Vehicle to Your Policy
Adding a vehicle mid-term to an Illinois multi-car policy re-rates the entire policy rather than adding a flat amount; the multi-car discount recalculates with the new vehicle's profile and coverage level.
Liability Coverage Per Vehicle
Every vehicle on an Illinois multi-car policy must carry the state's 25/50/20 liability minimum; you can raise limits on any vehicle independently while keeping the multi-car discount on the whole policy.
Full Coverage Per Vehicle
Full coverage—liability plus collision and comprehensive—is optional in Illinois and can differ per vehicle on a multi-car policy; you can carry liability only on an older vehicle and full coverage on a newer one, both earning the multi-car discount.
Combining Household Policies
Combining two separate Illinois policies into one multi-car policy requires every vehicle on the same policy and typically the same garaging address; the combined policy earns the multi-car discount on every vehicle.
Uninsured Motorist Coverage
Illinois mandates uninsured motorist coverage on every multi-car policy; this coverage pays your medical bills and vehicle damage when an uninsured driver hits you, and it applies to every vehicle and driver on your policy.
