The third in series of infographics I am designing to illustrate the average federal tax rate applied to different salaries. This time I am graphing the average tax rates for married couples filing a joint tax return but with 2 incomes (same salary for each). The difference between this graph and the couple with one income is that the the Social Security Tax cut off is now $213,600 (instead of $106,800), which increases their average SSN tax rate and their combined tax rates.