Excerpts from the Center on Budget and Policy Priorities (CBPP)
Based on CBO data:
- In 2007, the share of after-tax income going to the top 1 percent hit its highest level (17.1 percent) since 1979, while the share going to the middle one-fifth of Americans shrank to its lowest level during this period (14.1 percent).
- Between 1979 and 2007, average after-tax incomes for the top 1 percent rose by 281 percent after adjusting for inflation — an increase in income of $973,100 per household — compared to increases of 25 percent ($11,200 per household) for the middle fifth of households and 16 percent ($2,400 per household) for the bottom fifth (see Figure 1).
- If all groups’ after-tax incomes had grown at the same percentage rate over the 1979-2007 period, middle-income households would have received an additional $13,042 in 2007 and families in the bottom fifth would have received an additional $6,010.
- In 2007, the average household in the top 1 percent had an income of $1.3 million, up $88,800 just from the prior year; this $88,800 gain is well above the total 2007 income of the average middle-income household ($55,300). 
Income Gains at Top Have Outpaced All Other Groups Since 1979