If you deduct the home office as a business expense, then the percentage that is used for business will be deducted on Schedule C, and the rest will go to Schedule A as an itemized deduction. Even if TurboTax assigned some of your home office expenses as an itemized deduction, there is a chance that they might not exceed your standard deduction amount, if they do exceed it, you can choose to use the standard deduction.
If you select the standard deduction, you will still claim the home office business expense as a business deduction.
@GerryLP
