Because all deductions must be entered inti the Federal interview and they carry to the state (if any). Several states still allow that deduction. TurboTax has no way of knowing in advance if you will add a state that has that deduction, so if the question is not asked you might loose out on a state deduction.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
