Despite brand new tax rate reductions among the Jobs and Growth Tax Relief Reconciliation Act of 2003, the superior marginal income tax bracket for many retirees can be a whopping 46.3%. Why? Because Social Security benefits are subject to income financial. Those affected are Social Security recipients who have the good fortune (misfortune?) end up being subject to both the 25% taxes bracket and the 85% inclusion rate for Social Security benefits. I was paid $78,064, which I'm taxed on for So...