The plan, if ever enacted, could touch almost all Americans. The rich would see tax increases, the poor and the elderly would get smaller annual increases in their benefits, and middle income taxpayers would slip into higher tax brackets despite Obama's repeated vows not to add to the tax burden of the middle class. His proposed changes, once phased in, would mean a cut in Social Security benefits of nearly $1,000 a year for an average 85-year-old, smaller cuts for younger retirees.