This only works in some magical tax depreciation scheme. In reality, monthly mortgage costs in an area are going to be market driven as are rental prices for the exact same property, and while the two axis aren't completely orthogonal they are somewhat independent. My experience is that in any given year in most regions rent income will not cover house payments/taxes/upkeep without tying up absurd amounts of down payment. I finally bought the house I was renting and my mortgage alone is more than I was paying in rent. Only reason I did it was that it was a long term hedge on the 10% rent increases in my region that I'd been seeing and expecting for another few years at least. I'll let you know if it was a smart play in 30 years...