Ok, when it comes to interest, it is clear. Now I am curious what can be depreciated in new construction? Construction costs?
I am not a tax advisor and certainly don’t know all the semi-legal tricks. But in this case, I would take out two loans and not repay the one for the granny flat. Then I would try to allocate as much of the construction costs as possible to the granny flat. Grandma also only pays the minimum rent and in return gives bigger birthday and Christmas presents. If something breaks, it’s always in the granny flat. The depreciation on the house value, excluding the land, was increased from 2 to 3% in Jan. 23 and there is also a special depreciation for 5 years for energy efficiency.