Despite the tax rate reductions belonging to the Jobs and Growth Tax Relief Reconciliation Act of 2003, leading marginal income tax bracket for many retirees can be a whopping fouthy-six.3%. Why? Because Social Security benefits are subject to income in taxes. Those affected are Social Security recipients who have the good fortune (misfortune?) pertaining to being subject to both the 25% income tax bracket as well as the 85% inclusion rate for Social Security benefits. Delinquent tax retu...