Your current tax proposal is not workable. I'm all for taxing capital gains but taxing my home? That's simply silly and unworkable. I would have to be able to claim any interest on loans and any upkeep and what rate would you tax 'this pretend' income at? What income am I making? Whereas, if an investor buys a house and sells it 4 years later for 100% profit he doesn't pay ANY tax on the 400k he just made? Whereas, if the house I own's value goes up by 400% I'm now going to be paying more tax. Completely mental.