Yahoo! Finance: Where’s the best state for you to retire? Here’s a good place to start your search: These five impose the lowest taxes on retirees in the contiguous U.S., according to our research. All these retiree tax heavens exempt Social Security benefits from state income taxes. Many of them exclude government and military pensions from income taxes, too, or offer blanket exclusions up to a specific dollar amount for a wide variety of retirement income.