Often in visualizations of taxes, including mine, the focus is on the highest rate on the highest incomes. The Tax Policy Center calculated the combined federal tax rate on a median income family. To compare I have included the combined tax rate for a family with twice the median income.
The rate is the marginal combined Federal Income and Social Security and Medicare (FICA) Employee and Employer Tax Rates. I think of this rate as for a self-employed earner since they have to pay both employer and employee taxes themselves.
Keep in mind the Tax Policy Center calculates these rates for:
4 person family including a married couple with one earner
Itemized deductions are assumed to equal 23 percent of income through 1986 and 18 percent of income thereafter