What I-PASS is and how it works

I-PASS is an electronic toll collection system used on Illinois toll roads, including the Illinois Tollway, Chicago Skyway, and Indiana Toll Road. Instead of stopping at a booth to pay cash, you mount a small transponder on your windshield that communicates with toll readers as you drive through. The toll is charged automatically to a prepaid account you set up.

When you drive through a toll plaza with an active I-PASS transponder, the reader scans it and deducts the toll amount from your account balance. If your balance runs low, you receive a notice and can replenish it online, by phone, or by mail. Tolls charged to I-PASS accounts are typically lower than the cash rate at the same location.

You do not need to be an Illinois resident to use I-PASS, though the account holder must be at least 18 years old and have a valid payment method on file.

Key Takeaways

  • I-PASS transponders mount on your windshield and charge tolls automatically to a prepaid account, with rates lower than cash tolls.
  • You can open an account online at ipass.com, by phone at 1-800-UC-IPASS, or at a customer service center, and you will receive your transponder by mail in 5 to 10 business days.
  • Your account balance must stay positive; the system sends you a notice when it drops below a threshold, and you can add funds online anytime.
  • If you drive a rental car or borrowed vehicle, you can use a temporary I-PASS transponder or pay tolls by mail using the vehicle's license plate.

Opening an I-PASS account and getting your transponder

To open an account, visit ipass.com, call 1-800-UC-IPASS (1-800-824-4727), or visit an I-PASS customer service center in person. Online is the fastest route: you will need your driver's license number, vehicle license plate, and a valid credit card or debit card to set up payment.

When you open the account, you choose how much money to deposit upfront—typically $25 to $100. The I-PASS transponder itself is free. The system will mail it to you within 5 to 10 business days. Once you receive it, mount it on the inside of your windshield, centered near the top, and set up it through your online account or by calling customer service. Do not use it until you have activated it, or tolls will not be charged to your account.

If you need a transponder faster, some I-PASS customer service centers can issue one on the spot. Check the I-PASS website for center locations and hours near you.

Adding money to your account and managing your balance

I-PASS accounts work on a prepaid model. You load money into your account, and tolls are deducted each time you pass through a toll plaza. When your balance drops below a set threshold (usually $10), the system sends you an email or text notification.

You can add funds online at ipass.com using a credit or debit card, by phone at 1-800-UC-IPASS, or by mailing a check to the address on your account statement. Online replenishment is when ready; phone and mail take 1 to 3 business days to process. You can also set up automatic replenishment, which adds a fixed amount to your account whenever the balance falls below a level you choose.

Check your account balance anytime by logging into ipass.com or calling customer service. Your online account also shows a history of every toll you have paid, the date, and the location.

What happens if your account balance runs out

If you drive through a toll plaza and your account balance is zero or negative, the toll is not charged. Instead, the system records the violation using your license plate. You will receive a notice in the mail with instructions to pay the unpaid toll plus a penalty fee. The penalty varies but is typically $25 to $50 per violation on top of the toll amount.

To avoid this, respond to low-balance notices promptly and add funds before your balance reaches zero. If you do receive a violation notice, pay it within the timeframe stated on the notice. Unpaid violations can result in additional fees and may affect your vehicle registration renewal.

Using I-PASS with rental cars and borrowed vehicles

If you are driving a rental car, ask the rental company whether it has an I-PASS transponder already installed. Many rental agencies in Illinois offer this service, sometimes for a daily fee. If the rental does not have one, you have two options: purchase a temporary I-PASS transponder for the duration of your rental, or pay tolls by mail using the vehicle's license plate.

To pay tolls by mail, do nothing at the toll plaza—drive through normally. The toll authority will photograph your license plate and send an invoice to the vehicle's registered owner. The owner can then pay online or by mail. This method is slower and may include a processing fee, so using a temporary I-PASS transponder is usually faster and cheaper if you will be using tolls more than once.

You can order a temporary I-PASS transponder online or by phone before your trip. It works the same way as a regular transponder but is designed to be returned after your rental period ends.

Transponder problems and what to do

If your transponder stops working, tolls will not be charged to your account and you will receive violation notices instead. Common problems include a transponder that has fallen off the windshield, been damaged, or has a dead battery (though most modern transponders last 5 to 7 years).

If you suspect a problem, log into your account and check whether tolls are being charged. If not, call 1-800-UC-IPASS to report it. Customer service can send you a replacement transponder at no charge, or you can pick one up at a service center. In the meantime, you may be able to request a temporary exemption while waiting for a replacement, though this varies by situation.

If you see charges on your account that you did not make, or if you were charged twice for the same toll, contact customer service with the date, time, and location. They can review the transaction and issue a refund if an error occurred.

I-PASS rates and toll discounts

I-PASS rates are lower than cash rates on every Illinois toll road. The exact discount varies by location and vehicle type. For example, a passenger car might pay $1.50 with I-PASS versus $2.00 in cash at a particular toll plaza. Trucks and vehicles with more than two axles pay higher tolls in both categories.

Some I-PASS accounts also may have access to for additional discounts if you drive the same toll road frequently. Check your account page or call customer service to see whether you are enrolled in any discount programs.

Tolls increase periodically, and the I-PASS system will notify you of changes. You do not need to do anything when rates change—your account will straightforward charge the new rate the next time you use a toll road.

Frequently Asked Questions

Can I use I-PASS in other states?

I-PASS works on Illinois toll roads and the Indiana Toll Road. It does not work on toll roads in other states. However, many states participate in interoperability programs that allow their transponders to work on Illinois roads. If you have a transponder from another state, check whether it is compatible before relying on it.

What if I move or change my vehicle?

Log into your I-PASS account and update your vehicle license plate and address. You do not need a new transponder unless your old one is damaged. If you sell your vehicle, update your account when ready so tolls are not charged to the wrong vehicle.

Can I transfer my I-PASS account to someone else?

No. Each account is tied to the account holder's name and payment method. If someone else will be using the transponder regularly, they should open their own account. You can have multiple transponders on the same account if you own multiple vehicles.

What if I dispute a toll charge?

Contact I-PASS customer service with the date, time, and location of the toll. They will review the transaction and can issue a refund if an error occurred. Keep records of your trips in case you need to reference them.

Do I need I-PASS to drive on Illinois toll roads?

No. You can pay tolls in cash at toll plazas that accept cash, or you can pay by mail using your license plate. However, I-PASS rates are significantly lower and you avoid stopping at booths, so most regular users find it worthwhile.