Taxpayers with Adjusted Gross Income (AGI) of $200,000 or more represented over 3% of all returns filed in 2008. Taxpayers whose ages were 35 to 44 filed the most returns in the years 1997 and 2007. In 2007, taxpayers whose ages were 45 to 54 accounted for the largest percentage of AGI. News Release IR-2011-67.