Despite the actual tax rate reductions for this Jobs and Growth Tax Relief Reconciliation Act of 2003, leading marginal tax bracket for many retirees is really a whopping fouthy-six.3%. Why? Because Social Security benefits are subject to income taxation. Those affected are Social Security recipients who have the good fortune (misfortune?) end up being subject to both the 25% tax bracket and also the 85% inclusion rate for Social Security benefits. There's a change between, "gross income," an...