TurboTax will always choose the deduction option that seems to provide the best advantage for the taxpayer.
However, there are situations where the taxpayer will choose to file the deductions a different way. E.G. Married filling separate.
Therefore, TurboTax is only confirming the deduction option the you selected.
Please see: How do I change from the standard deduction to itemized (or vice-versa)?
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