“Usually when people sell property at a profit, that profit is considered income and taxed,” said Steve Wamhoff, senior fellow for federal tax policy at the nonpartisan Institute on Taxation and Economic Policy. “But some investors are able to set up deals so that technically they are just ‘trading’ one property for another, and they tell the IRS that it was just a trade, not a sale, so there is no income to tax. (This is called a like-kind exchange.)