How to Locate Your Webfile Number [Official]. This official video from the Texas Comptroller of Public Accounts shows you how to locate or obtain your Webfile Number. Your Webfile number is your "access code" to the Comptroller's electronic reporting system. Your Webfile number is a six-digit number beginning with RT or XT. This number is unique to your account and tax type. Visit the Texas Comptroller's Webfile page
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