That's not really how the Texas WebFile numbers work. Your WebFile number is the same every year, and it's printed on every piece of correspondence you get from Texas, including a mailing sent right before the unextended due date of the Texas Franchise Tax Return. You can call a 24/7 toll-free number to look it up. Texas doesn't use a signature document; they use the WebFile number as proof the taxpayer has requested the return be filed.

This is a first-year return issue that only applies to entity returns, including Single Member LLCs.