The property tax was separate, and it happens regardless. The 15% is the long term capital gain rate - if the value of an asset increases (say 300k->500k) I have a 200k gain. I don't pay tax on that 200k until I sell, but if there were an in-process gain tax, I would. So instead of owing taxes on my profit/gain when I sell, I would pay the gain each year (and carry over a loss if the value of the house decreased). Coming up with 30k (200kx15%) would be a tough think to do simply because my neighborhood got popular in the Real Estate market.