The bottom 50 percent of taxpayers (taxpayers with AGIs under $36,055) faced an average effective income tax rate of 3.3 percent. As taxpayer AGI increases, the IRS data shows that average income tax rates rise. For example, taxpayers with AGIs between the 10th and 5th percentile ($125,195 and $175,817) pay an average effective rate of 13.3 percent—four times the rate paid by those in the bottom 50 percent.