How Old Do You Have to Be to Rent a Car in Illinois?

To rent a car in Illinois, you generally have to be at least 21. State law itself sets no minimum age — 625 ILCS 5/6-305 only requires that a renter hold a valid, unexpired driver’s license — but the statute lets rental companies set their own age and driving-record requirements, and virtually every major company in Illinois draws the line at 21.¹

Why 21 Is the Practical Minimum

Illinois law allows a rental company to enforce “minimum age and driver’s record requirements” as long as it applies them uniformly to every customer.¹ Companies have used that discretion to standardize on 21 across the industry. So while nothing in state law blocks a licensed 18-year-old from renting, in practice you will not find a company in Illinois willing to hand over the keys before your 21st birthday.

The one narrow route around that ceiling runs through federal travel, not state law. See the section below on government and military renters.

Young Renter Fees for Ages 21 to 24

Turning 21 gets you the keys, but not at the same price an older renter pays. Drivers between 21 and 24 face a daily “young renter fee” from nearly every company operating in Illinois.

Typical rates run between $20 and $30 per day, though some locations and vehicle classes charge more. On a week-long rental, the surcharge alone can add $140 to $210 to your bill before taxes. The fee is applied per day of the rental, not once per contract, so longer trips feel it more.

The surcharge normally drops off the day you turn 25. If your birthday falls during a rental, that’s worth asking about at the counter, since some companies will re-price the remaining days.

Renting Under 21 for Government or Military Travel

Travelers as young as 18 can rent in Illinois when they’re on official federal business. The mechanism is the U.S. Government Rental Car Agreement, a contract between the federal government and participating rental companies. It is not the Servicemembers Civil Relief Act, which covers interest rate caps, lease terminations, and court protections and has nothing to do with rental age minimums.²

To use the exception, you have to prove official travel status. The agreement recognizes three ways to do that:

Travel authorization or orders, the standard approach for military personnel on temporary duty or a permanent change of station.
A Government Travel Charge Card, which on its own is enough when you’re on authorized travel.
Government or military identification, which the rental company can accept as evidence of federal employment if you don’t have orders or a travel card.²

A few limits apply even inside the exception. Renters aged 18 to 20 may still be charged an underage driver fee. They must be listed on the agreement as the renter or as an additional driver. And the exception does not extend to 10-, 12-, or 15-passenger vans, which require every driver to be at least 25.

Spouses and Additional Drivers

Age rules interact with who else is allowed to drive the car. Illinois defines an “authorized driver” to include the renter’s spouse, provided the spouse is licensed and meets the company’s minimum age requirement.³ Because the statute already covers your spouse, you generally do not need to add them as an “additional driver” on the contract, and doing so voluntarily can trigger a daily fee you weren’t required to pay. If your spouse has an accident while driving, their status as an authorized driver under the statute means the company cannot deny the claim solely because they weren’t listed.

Non-spouse additional drivers are treated differently. Each one generally has to appear at the counter, present a valid license, and be added to the agreement. Most companies charge a daily additional-driver fee for them, and many require these drivers to be at least 25 rather than 21. Policies vary by company and location, so confirm before you arrive.

What You Bring to the Counter

Whatever your age, Illinois law requires the rental company to inspect your driver’s license — including electronically or digitally — and confirm that it is unexpired before releasing the vehicle.¹ A valid license from your home state or country satisfies this requirement if you’re a nonresident.

You’ll also need a payment card. Rental companies place a hold, not a charge, to cover the estimated rental plus a cushion for incidentals. If you plan to use a debit card instead of a credit card, expect stricter treatment: many companies limit debit-card renters to mid-range vehicle classes, run a credit check at the counter, and place a larger hold, often $500 or more above the estimated charges, that ties up real cash in your bank account until the rental closes out. Younger renters relying on a debit card should build extra funds into their travel budget for exactly this reason.

Insurance You Still Have to Carry

Meeting the age minimum doesn’t relieve you of Illinois’s insurance requirements. Every driver in the state must carry minimum liability coverage, and that obligation follows you into a rental. The current minimums are $25,000 per person for bodily injury, $50,000 per accident for bodily injury, and $20,000 per accident for property damage.⁴

If your personal auto policy already meets those limits, you can decline the coverage the rental company offers at the counter. If you don’t own a car and have no personal policy — a common situation for renters in their early 20s — you’ll need to buy coverage through the rental company or use a credit card that provides rental car insurance as a benefit. Driving off without either is where a routine rental can turn into a serious financial problem after a single accident.

1
Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/6-305 – Renting Motor Vehicle to Another
2
Department of Defense. US Government Rental Car Agreement 5
3
Illinois General Assembly. Public Act 90-0113
4
Illinois Department of Insurance. Auto Insurance Shopping Guide