The surtax that has been proposed in the House of Representatives' health care bill would hit a approximately 0.35% of all tax returns, those with an adjusted gross income of $1 million or more, $500,000 or more for single filers, the Tax Foundation estimates. Above is the foundation's estimate of what percentage of income taxes those impacted by the surtax would pay if rates stay as they are, and if the Bush tax cuts are allowed to expire and if a health care surtax is enacted.