If you rented the whole house for less than fair rental, you would not list the house as a rental. Since you rented 20%, that could have been a room you rented and tried to rent more. Not knowing any more of your story, the 20% property tax deduction for the 20% rental makes sense if you qualify to claim the rental. Again, please see Publication 527 (2020), Residential Rental Property for full instructions for your situation.
Begin first with -Did you hold out the whole house for rent?
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