No, you can only claim the area that is rented exclusively to him.
Go into your
TurboTax return. Not sure you're in there? Click on the orange Take me to my return button.
1.
Search for rentals and then
click the "Jump to" link in the search result.
2.
Answer Yes to the
question Did you have any rental or
royalty income and expenses?
3.
Follow the on-screen instructions as you proceed through the rental and
royalties section.
When you get
to the Do any of These Situations apply to This
Property (See the attached screenshot below. Click to enlarge.)
Select I rent out part of my home.
Yes to Let Us
Calculate Your Expense Deductions for You (See the attached screenshot
below. Click to enlarge.)
Next screen
"enter use percentage" this where the % goes for TurboTax to do
the calculation.
Enter rental use
percentage
You must divide the expense between rental use and
personal use. You can use any reasonable method for dividing the expense. It
may be reasonable to divide the cost of some items (for example, water) based
on the number of people using them. The two most common methods for dividing an
expense are (1) the number of rooms in your home, and (2) the square footage of
your home.
Only the exclusive used area is considered rental
area.
Common area is available to all and is not a factor
in allocation of expenses.
