The program chooses the deduction method that lowers your federal tax the most (standard vs. itemized). You can see which method was used or compare what happens if you override the program's selection.
Please
read this TurboTax FAQ for additional information on "How do I change from the standard deduction
to itemized (or vice-versa)?": How do I change from the
standard deduction to itemized (or vice-versa)?
