What is my Webfile number for paying taxes in Texas with ATX™?
According to Comptroller.Texas.Gov:
"Your Webfile number is your 'access code' to Webfile issued by the Comptroller's office. It is printed in the upper left corner of the tax report we mail to each taxpayer and on most notices. It is two letters followed by six numbers (Example: RT666666).
You need Texas taxpayer ID numbers and Webfile number(s) for each taxpayer account.
If you do not have your Webfile number, you can contact us at (800) 442-3453 24 hours a day, 7 days a week. This automated system can provide a Webfile number if you can provide confidential information from a previously filed report. You can request a duplicate report via this automated system if you cannot provide the confidential information."