What TxTag is and how payment works
TxTag is the toll collection system used on Harris County toll roads in the Houston area, including the Sam Houston Tollway, Hardy Toll Road, and Fort Bend Tollway. When you drive through a toll plaza, sensors read your TxTag transponder (a small device mounted on your windshield) and charge your account. You do not stop or hand over cash — the system records the toll and bills you later.
Your account balance decreases each time you use a toll road. When your balance runs low, you receive a notice asking you to replenish it. If your balance goes negative and you do not pay within a set period, late fees and penalties begin to accumulate, and the Texas Department of Motor Vehicles can suspend your vehicle registration.
Payment is straightforward: you add money to your account in advance so tolls are deducted as you drive. The amount you prepay depends on how often you use the toll roads — some people add $25 at a time, others add $100 or more.
Key Takeaways
- You can pay your TxTag account online through the Harris County Toll Road Authority website, by phone, by mail, or in person at a payment location.
- Online payment is the fastest method and lets you set up automatic replenishment so your account never goes negative.
- If your account balance goes negative, you have a grace period before late fees explore, but the exact length depends on your account type.
- Late fees and penalties can add up quickly, and unpaid tolls can result in vehicle registration suspension through the Texas Department of Motor Vehicles.
- You need your TxTag account number or vehicle license plate to make a payment, and most methods process within one to three business days.
Paying online through the Harris County Toll Road Authority website
The fastest way to pay is through the official Harris County Toll Road Authority website at www.hctra.org. Log in with your account number and password, or create an account if you do not have one yet. Once logged in, you can see your current balance, transaction history, and any outstanding charges.
To add funds, select the payment option and enter the amount you want to prepay. The site accepts credit cards, debit cards, and bank account transfers. Credit and debit card payments typically process within one business day. Bank transfers may take two to three business days to appear in your account.
The website also lets you set up automatic replenishment, which is the easiest way to avoid a negative balance. You choose a minimum balance (for example, $10) and a replenishment amount (for example, $50). When your balance drops below the minimum, the system automatically charges your card or bank account and adds the replenishment amount. This means you never have to remember to pay manually.
Paying by phone, mail, or in person
If you prefer not to pay online, you can call the Harris County Toll Road Authority customer service line at 1-281-875-TOLL (8655). A representative can process a payment over the phone using your credit card, debit card, or bank account information. Phone payments typically take one to three business days to post to your account.
You can also mail a check or money order to the address listed on your toll bill or on the HCTRA website. Include your account number or license plate number on the check so the payment is credited correctly. Mail payments take longer — usually five to seven business days — so mail a payment well before your balance goes negative.
Some TxTag customer service centers accept in-person payments, though locations and hours vary. Check the HCTRA website for the nearest payment location and current hours before you go.
What happens if your account goes negative
If you drive through a toll plaza and your account balance is insufficient to cover the toll, your account goes negative. You then enter a grace period during which you can pay the negative balance without penalty. The length of this grace period depends on your account type — some accounts have 30 days, others have longer or shorter periods.
If you do not pay the negative balance before the grace period ends, the Harris County Toll Road Authority adds late fees to your account. These fees can range from $5 to $25 per unpaid toll, depending on the amount of the toll and how long it remains unpaid. The longer you wait, the more fees accumulate.
If your account remains unpaid for several months, the debt can be referred to a collection agency, and the Texas Department of Motor Vehicles may suspend your vehicle registration. Once your registration is suspended, you cannot legally drive the vehicle until the toll debt is paid and the suspension is lifted.
Setting up automatic replenishment to avoid problems
Automatic replenishment is the single most effective way to prevent a negative balance and avoid late fees. When you set it up through the HCTRA website, you choose both a trigger balance (the point at which replenishment happens) and a replenishment amount (how much money to add each time).
For example, if you set a trigger of $10 and a replenishment amount of $50, the system will automatically charge your card whenever your balance drops to $10 or below, adding $50 to bring you back above the trigger. You can change these settings anytime through your online account.
Automatic replenishment requires a valid credit card or bank account on file. The charges appear on your statement just like any other recurring payment. If your card expires or is declined, the system will attempt to use a backup payment method if you have one on file, or it will notify you to update your payment information.
Disputing a toll charge or incorrect balance
If you believe a toll charge is wrong — for example, you were charged twice for the same crossing, or the amount seems incorrect — you can dispute it through your online account or by calling customer service. Have your transaction history ready, including the date, time, and location of the disputed toll.
The HCTRA will review your dispute and respond within a set timeframe, usually 10 to 15 business days. If the dispute is valid, they will credit your account. If it is not valid, they will explain why the charge stands. Disputes do not stop late fees from accumulating, so pay any undisputed balance while your dispute is being reviewed.
Frequently Asked Questions
Can I pay someone else's TxTag account?
Yes, you can make a payment toward any TxTag account if you have the account number or the vehicle license plate number. You do not need to be the account holder. This is useful if you borrowed someone's vehicle or want to help a family member pay their toll bill. Call customer service or use the online payment portal and enter the account or plate number you want to pay toward.
What if I lost my TxTag transponder?
Contact the Harris County Toll Road Authority to report the lost transponder and request a replacement. You will need to pay a replacement fee, which varies but is typically around $25 to $35. Once you receive the new transponder, mount it on your windshield and link it to your account through the website or by calling customer service. Your old transponder will be deactivated so it cannot be used fraudulently.
Do I have to use a TxTag, or can I pay tolls another way?
On Harris County toll roads, a TxTag transponder is the standard payment method. If you do not have a TxTag, the toll plaza cameras will photograph your license plate and you will receive a bill by mail. However, this method is slower and may include additional processing fees. Having a TxTag account is the most efficient way to use the toll roads regularly.
What if I move out of state — can I keep my TxTag account?
Yes, you can keep your account active even if you move. You can continue to pay online or by phone from anywhere. However, if you no longer plan to use Harris County toll roads, you can close your account and request a refund of any remaining balance. Contact customer service to close the account and arrange the refund.
How do I know if my vehicle registration has been suspended for unpaid tolls?
The Texas Department of Motor Vehicles will send you a notice if your registration is suspended due to unpaid tolls. You can also check your registration status through the DMV website or by calling your local county tax assessor-collector's office. To lift the suspension, you must pay the toll debt in full to the Harris County Toll Road Authority and then contact the DMV to confirm the debt has been resolved.