FL has no state income tax. You will be filing a federal tax return. You are not even required to enter a DL to e-file a federal return, but if you are going to enter a DL, use your current AZ license.
And..make sure your tax return has your new AZ mailing address so the IRS knows where to send you a letter or a check.
**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.**
