My husband is a self employed contractor. In the last few years, our accountant has only deducted a percentage of our mortgage interest pd and real estate taxes based on the size of my husband's office compared to our total house size. I always thought that mortgage interest was totally tax deductable and had nothing to do with whether or not your business was ran out of your home. This year, we had a much higher interest payment ( about 7,000 more) and I would of course like to get what we are entitled to as far as a refund. Any thoughts would be appreciated.