Look at the Form 1040. Just above the section that says "Sign here" there is a section for a Third Party Designee---that is what you want to use if your granddaughter wants to allow you to talk with the taxing authorities for her.
You do not sign the return as if you are a paid tax preparer. When you use TurboTax, even when you prepare a return for a family member or friend, the return is considered to be "self-prepared."
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
