Why is the installation of a banister tax deductible, but the preparatory work in the workshop not? And why do citizens have to pay for road improvements on their doorstep, but don't get a tax discount on their expenses? The Federal Fiscal Court (BFH) will soon decide on such contentious work around the house and yard. There is a lot of money involved. In addition, various savings opportunities have already opened up that no longer end at the property line or at the front door. There is also scope in new buildings. What works so far - and how to get the most out of it.