What I-PASS Is and How It Works

I-PASS is an electronic toll collection system run by the Illinois Toll Highway Authority (ITHA) that lets you pay tolls automatically as you drive on Illinois toll roads instead of stopping at a booth. When you have an I-PASS account, a small transponder mounted on your windshield communicates with readers at toll plazas, and the toll is deducted from your prepaid account balance.

The system covers Illinois toll roads including the Chicago Skyway, the Tri-State Tollway (I-94 and I-90), the Reagan Tollway (I-88), and the Veterans Memorial Tollway (I-355). You can also use I-PASS on toll roads in Indiana, Ohio, and other states that participate in the E-ZPass network, though rates may vary by state.

Without I-PASS, you pay cash or use a credit card at toll plazas, which is slower and costs more per toll. With I-PASS, you get a discount on every toll you pay — typically 30 to 50 percent less than the cash rate, depending on the road and your vehicle type.

Key Takeaways

  • I-PASS is a prepaid electronic toll account that deducts tolls automatically from your balance as you drive.
  • You receive a discount on every toll when you use I-PASS instead of paying cash, usually 30 to 50 percent less.
  • You can set up an account online at ipass.illinois.gov, by phone at 1-800-UC-IPASS, or at a customer service center.
  • Your transponder must be mounted on your windshield in the correct position, and you need to replenish your account balance when it runs low.
  • If you move out of state or no longer need I-PASS, you can close your account and receive a refund of any remaining balance.

How to Set Up an I-PASS Account

You can open an I-PASS account online, by phone, or in person. The fastest route is the ITHA website at ipass.illinois.gov, where you create a login, enter your vehicle information (license plate, vehicle type, and weight), and provide a payment method. You will need a valid driver's license or state ID and a credit card or bank account for automatic replenishment.

If you prefer to speak with someone, call 1-800-UC-IPASS (1-800-824-4727) and a representative will walk you through the process. You can also visit a customer service center in person — locations are listed on the ITHA website. There is no fee to open an account, though you will need to prepay a minimum balance to set up your transponder.

Once your account is open, the ITHA mails you a transponder (the small device that communicates with toll readers). The transponder arrives within 7 to 10 business days. You mount it on the inside of your windshield in the location shown in the instructions — usually the upper driver's side or passenger's side. The placement matters: if the transponder is not positioned correctly, the reader may not detect it and you could be charged the cash rate or sent a violation notice.

Prepaid Balances and Automatic Replenishment

Your I-PASS account works like a prepaid card. You load money into it, and each toll you pay is deducted from that balance. The minimum opening balance varies but is typically $25 to $50. You can add more money at any time through your online account, by phone, or at a customer service center.

Most I-PASS holders set up automatic replenishment, which means the system adds money to your account automatically when your balance drops below a certain threshold you choose. This prevents your account from running empty and keeps you from being charged the cash rate on a toll. You can set your replenishment amount and threshold in your online account settings.

If your balance does run out while you are driving, you will be charged the cash toll rate for that transaction. Your account will show a negative balance, and you will need to add funds before you can use I-PASS again. Letting your account go negative for too long can result in a violation notice or suspension of your transponder.

Understanding Toll Rates and Discounts

I-PASS toll rates are lower than cash rates on every Illinois toll road. The exact discount depends on which road you are using and what type of vehicle you have. Cars typically get a 30 to 50 percent discount, while trucks and vehicles with more axles pay a different rate structure.

Rates also vary by time of day on some roads. The Chicago Skyway and Tri-State Tollway use congestion pricing in certain areas, meaning tolls are higher during peak traffic hours and lower during off-peak times. Your I-PASS account shows the toll amount when ready after you pass through a plaza, so you can see exactly what you paid.

You can view your toll history and account balance anytime by logging into your online account or calling customer service. The website shows each transaction date, location, toll amount, and your remaining balance.

What to Do If Your Transponder Is Lost, Damaged, or Not Working

If your transponder stops working, is damaged, or is lost, contact the ITHA when ready. Call 1-800-UC-IPASS or log into your account online to report the problem. The ITHA will deactivate your old transponder so it cannot be used fraudulently and will mail you a replacement at no charge.

While you wait for the replacement, you can pay tolls using the cash lane or a credit card. However, you will pay the full cash rate instead of the I-PASS discount. Once your new transponder arrives, mount it in the correct position and your account will work normally again.

If you are charged a toll you believe is incorrect, or if you were charged the cash rate when your transponder should have been read, you can dispute the charge through your online account or by calling customer service. The ITHA will investigate and may adjust your account if an error is found.

Moving Out of State or Closing Your Account

If you move out of Illinois or no longer drive on toll roads, you can close your I-PASS account. Log into your account online, call 1-800-UC-IPASS, or visit a customer service center and request account closure. The ITHA will refund any remaining balance in your account, usually within 7 to 10 business days, to the payment method you used to fund the account.

You do not have to return the transponder, though you should destroy it or remove the batteries so it cannot be used. If you move to another state that uses E-ZPass, you may be able to transfer your account or use your transponder on that state's toll roads — contact the ITHA to confirm before you close your account.

If you plan to return to Illinois later, you can reopen an account using the same process. Your old account history will not carry over, but there is no penalty for closing and reopening.

Frequently Asked Questions

Can I use I-PASS in other states?

Yes. Your Illinois I-PASS transponder works on toll roads in Indiana, Ohio, Pennsylvania, New York, and other states that are part of the E-ZPass network. However, toll rates and discounts vary by state, and some states may charge you a different rate than Illinois does. Check the E-ZPass website or contact the ITHA before traveling to confirm rates in the state you are visiting.

What happens if I drive through a toll plaza without a working transponder?

If your transponder is not detected, you will be charged the full cash toll rate. If this happens repeatedly, the ITHA may send you a violation notice. If you believe your transponder should have been read, contact customer service with the date, time, and location of the toll, and they can investigate whether an error occurred.

Can I have more than one transponder on my account?

Yes. You can register multiple vehicles to a single I-PASS account and have a transponder for each one. All tolls from all transponders are deducted from the same account balance. This is useful if you have multiple cars or if you share driving responsibilities in a household.

What if I forget to mount my transponder correctly?

If your transponder is not in the correct position on your windshield, the toll reader may not detect it and you will be charged the cash rate. Check the instructions that came with your transponder and make sure it is mounted on the inside of the windshield in the location shown. If you are unsure, contact customer service and they can confirm the correct placement for your vehicle.

How long does it take to receive my transponder after I open an account?

The ITHA typically mails transponders within 7 to 10 business days of account opening. If you need a transponder faster, some customer service centers may have transponders available for when ready pickup, though this varies by location. Call 1-800-UC-IPASS to ask about same-day or next-day pickup options near you.