Thanks for the repsonse, I am not sure what was my case. After mother passed away, it was empty, I need some one to use the propery while it was on sale for about 2 years. Finally sold and try to figure out the expense if I can. I do not have any expense claim except the propery tax. Rent income was small compared to the high property tax.
My question in my case, can I use the property tax as expense. If yes, all of it or only 20%? I think it is reasonable to use the 20% of propery tax as expense.
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?