How TxTag Tolls Work and What Happens When You Don't Pay
What TxTag is and how the payment system works
TxTag is the electronic toll collection system used on most toll roads in Texas. When you drive through a toll plaza, a reader scans a small transponder mounted on your windshield and charges your account automatically. You do not stop, do not hand over cash, and do not receive a receipt at the booth—the charge appears in your account later.
The system is run by the Harris County Toll Road Authority (for Houston-area roads) and other regional authorities depending on which toll road you use. Each authority maintains its own customer accounts and sends its own bills. If you drive tolls in multiple regions of Texas, you may have separate accounts with different authorities.
Money leaves your account through ACH withdrawal (automatic bank transfer) or credit card charge, depending on how you set up payment. Most accounts are set to auto-pay, meaning the system withdraws funds automatically when your balance drops below a certain threshold. If auto-pay is off, you receive a bill in the mail and must pay by the due date.
Key Takeaways
- TxTag charges you automatically when you drive through a toll plaza; the transponder on your windshield is scanned and your account is debited.
- You can set up auto-pay so funds are withdrawn from your bank account or charged to a credit card automatically, or you can pay by mail when you receive a bill.
- If you do not pay tolls owed, the toll authority can place a hold on your vehicle registration renewal and report the debt to a collection agency.
- You can check your balance and transaction history anytime through the TxTag website or customer portal for your specific toll authority.
- If you dispute a charge, you must contact the toll authority within a set timeframe; they will investigate and refund you if the charge was incorrect.
Setting up a TxTag account and choosing how to pay
To use TxTag, you must open an account with the toll authority that operates the roads you drive. For Harris County toll roads (the largest system in Texas), you register online at the Harris County Toll Road Authority website, provide your vehicle information and a valid payment method, and request a transponder. The transponder arrives by mail within one to two weeks.
When you set up your account, you choose between auto-pay and pay-by-mail. Auto-pay is the default and most common option: you link a bank account or credit card, and the system automatically withdraws money when your balance falls below a threshold you set (usually $10 to $25). Pay-by-mail means you receive a bill every month or every few months and must submit payment by the due date yourself.
You can change your payment method or switch between auto-pay and pay-by-mail anytime through your online account. If you use auto-pay and your linked bank account or card is declined, the system will attempt the charge again over the next few days. If all attempts fail, your account goes unpaid and you will receive a bill.
What happens if your TxTag account falls behind
If you do not pay tolls owed by the due date, the toll authority first sends you a notice. The notice includes the amount owed, the due date for payment, and instructions for paying online, by phone, or by mail. At this stage, you can still pay without penalty.
If you ignore the notice and do not pay within 30 to 60 days (the exact timeline varies by authority), the toll authority can place a registration hold on your vehicle. This means you cannot renew your vehicle registration with the Texas Department of Motor Vehicles until the toll debt is paid. The hold appears when you try to renew online or at the DMV office.
If the debt remains unpaid for several months, the toll authority may report it to a collection agency. Once in collections, the debt can damage your credit score and the collection agency can pursue you for payment through phone calls and letters. Some toll authorities also pursue legal action for large unpaid balances, though this is less common.
How to check your balance and dispute a charge
You can view your current balance, recent transactions, and payment history anytime by logging into your online account on the toll authority's website. Most systems show the date, time, location, and amount of each toll charge within one business day of driving through the plaza. You can also set up email or text alerts so you are notified when your balance drops below a certain amount.
If you see a charge you believe is wrong—for example, a duplicate charge or a toll you did not drive—contact the toll authority's customer service department. You will need to provide your account number, the date and location of the disputed charge, and an explanation of why you believe it is incorrect. The authority will investigate, which usually takes two to four weeks, and will refund you if they determine the charge was an error.
Disputes must be reported within a set timeframe, usually 60 to 90 days of the charge date. After that window closes, the toll authority may not investigate. If you notice a problem, report it as soon as you can.
What to do if your transponder is lost, stolen, or damaged
If your transponder stops working, is damaged, or is stolen, contact your toll authority's customer service and request a replacement. Most authorities replace transponders for free or for a small fee (usually $5 to $10). You will receive a new transponder by mail within one to two weeks.
Until the new transponder arrives, you can still drive toll roads, but you will be charged a higher rate or a toll-by-mail fee. Toll-by-mail means the authority photographs your license plate, identifies your vehicle, and sends you a bill for the toll plus an administrative fee (usually $2 to $5 per toll). This is more expensive than using a transponder, so it is worth requesting a replacement quickly.
If your transponder was stolen, you may also want to contact the toll authority to flag your old transponder as inactive so no one else can use it on your account.
Transferring your TxTag account to a new vehicle
If you sell your car or buy a new one, you need to update your TxTag account with the new vehicle information. Log into your online account and update your vehicle's license plate number and vehicle identification number (VIN). The transponder itself can usually stay on your new vehicle—you do not need to request a new one unless it is damaged or no longer sticks to the windshield.
If you sell your vehicle to someone else, remove the transponder from the windshield before you hand over the car. If the new owner drives through a toll plaza with your transponder still attached, the tolls will be charged to your account. Once you remove it, update your account to reflect that you no longer have that vehicle.
Frequently Asked Questions
Can I use the same TxTag transponder on multiple vehicles?
No. Each transponder is linked to one vehicle. If you own multiple vehicles and drive tolls in all of them, you need a separate transponder and account for each vehicle, or you can link multiple vehicles to one account and switch the transponder between them (though this is inconvenient). Contact your toll authority to discuss the best setup for your situation.
What if I drive a rental car through a toll plaza?
If the rental car has a TxTag transponder, the rental company's account is charged. You will see the toll charge on your rental agreement or receive a separate bill from the rental company. If the rental car does not have a transponder, the toll authority photographs your license plate and sends a bill to the rental company, which then bills you. Either way, you are responsible for paying the toll.
Can I get a refund if I overpaid my TxTag account?
Yes. If your account has a credit balance (you paid more than you owe), you can request a refund through your online account or by calling customer service. Refunds are usually processed within two to four weeks and sent to your original payment method.
What happens if I move out of Texas?
You can close your TxTag account anytime through your online account or by calling customer service. If you have a credit balance, request a refund. If you owe money, you must pay the balance before closing the account. If you do not close the account and do not pay tolls owed, the debt can still be reported to collections.
Do I have to use TxTag, or can I pay tolls another way?
Most toll roads in Texas require a transponder for the lowest rate. If you do not have a transponder, you can still drive through the toll plaza and pay by mail (the toll authority photographs your plate), but you will pay a higher rate plus an administrative fee. Some toll roads offer a cash lane where you can pay at a booth, but these are becoming less common. Check your specific toll road's website to see what payment options are available.