Yes. Enter the full amount of each of your expenses and Turbo Tax will calculate the amount that is deductible as a rental expense as well as any amounts that you can take as itemized deductions, if you qualify to itemize.

To enter your expenses in Turbo Tax:

• log in to your Turbo Tax account
• click on "take me to my return"
• click on "federal taxes" tab
• click on "wages and income"
• scroll down to rental properties and royalties" and click on "edit/add"
• Turbo Tax will start asking you questions about your rental property. Be sure to indicate that you are renting out a duplex that you also live in. 
• You will see a screen that says, "let us calculate your expense deductions for you". Answer "yes" I will enter total amounts and let Turbo Tax do the math.