I built a house in 2002 and am receiving Mortgage Interest relief at source (TRS) for it. It is my first and only house and is my main residence (PPR). Last year I decided to rent it out for a two year period amd move back in with my parents. I am still receiving TRS on the house. After the two years I will be moving back in. Is the mortgage interest I pay on the house an allowable expense against rental income even thought I am still receiving TRS? If it is how do i include this on Form 12. Do I calculate it at my standard rate of tax (20%). Any help much appreciated.