I own a two-family house (duplex) and live on the first floor. Traditionally I've been reporting half the taxes and mortgage interest as expenses against the rental income, and the other half as my mortgage deduction.
This year I have plenty of expenses to deduct since I had to have some repairs made and took over utilities to rent the place out on AirBnB. The result of that is my interest and tax don't lower my tax bill any further.
On the other hand, I could list the Mortgage Interest and Property Taxes in the personal deduction section instead my tax bill goes down quite a bit. But is that actually allowed?