Federal income tax rates for 2006 Taxable income Tax Not over $36,378 Over $36,378 but not over $72,756 Over $72,756 but not over $118,285 Over $118,285 15% $5,457+22% of excess over $36,378 $13,460+ 26% of excess over $72,756 $25,297 + 29% of excess over $118,285