The federal government levies payroll taxes on wages and self-employment income and uses most of the revenue to fund Social Security, Medicare, and other social insurance benefits. In fiscal year 2014, federal payroll taxes generated $1.02 trillion, which amounts to 5.9 percent of the nation’s Gross Domestic Product (GDP), or 34 percent of all federal revenues (see Policy Basics: Where Do Federal Tax Revenues Come From? ).
Main Payroll Taxes Fund Social Security and Medicare
The two main federal payroll taxes levied on wages are known as Federal Insurance Contributions Act (FICA) taxes. Employees and employers both pay FICA taxes: employees usually have them withheld from their paychecks, while employers pay them in addition to any other taxes they owe. However, most economists agree that employees bear the true cost of employer payroll taxes in the form of lower wages. The two FICA taxes are:
- Social Security tax. also known as the Old Age, Survivors, and Disability Insurance (OASDI) tax. It is levied at a rate of 12.4 percent (split evenly between employees and employers) up to a maximum amount of an employee’s wages ($118,500 in calendar year 2015). This wage cap is adjusted annually to take account of increases in average wages. The revenues go toward funding Social Security, which pays benefits to retirees, persons with disabilities, and survivors of deceased workers (see Policy Basics: Top Ten Facts About Social Security and Policy Basics: Social Security Disability Insurance ).
- Medicare tax. also known as the Medicare hospital insurance (HI) tax. It is levied at a rate of 2.9 percent of wages (split evenly between employees and employers); unlike the Social Security tax, there is no wage cap. Married filers’ earnings over $250,000 (and singles’ earnings over $200,000) are taxed at an additional 0.9 percent, for a total of 3.8 percent on this income. Revenues from the Medicare
tax support the hospital insurance portion of Medicare. (There is a 3.8 percent tax on investment income for high-income taxpayers as well, but it isn’t withheld through the payroll tax or reserved for the Medicare Hospital Insurance trust fund.)
People who work for themselves pay a self-employment tax — the Self Employment Contributions Act (SECA) tax — to fund Social Security and Medicare. These taxes are equivalent to FICA taxes; the same basic rates and caps effectively apply.
A third federal payroll tax is the Federal Unemployment Tax Act (FUTA) tax. Employers pay an effective rate of 0.6 percent on the first $7,000 of a worker’s wages, up to $42 per worker per year. The revenues mainly go toward financing the administration of state unemployment insurance programs. Each state collects an additional unemployment payroll tax to further finance unemployment benefits. (For more, see Introduction to Unemployment Insurance .)
Payroll Taxes Have Larger Impact on Lower-Income People
Payroll taxes are regressive: low- and moderate-income taxpayers pay more of their incomes in payroll tax than do high-income people, on average. The bottom fifth of households paid an average of 6.6 percent of their incomes in payroll tax in 2014, according to Tax Policy Center estimates, while the top fifth paid 5.9 percent and the top 1 percent of households paid just 2.3 percent. This figure includes the employer and employee shares of the payroll tax.
As policymakers have strengthened social insurance programs like Social Security and Medicare over time, payroll taxes have become an increasingly important part of the federal budget. In 1938, just after the introduction of Social Security and unemployment insurance, payroll taxes accounted for 23 percent of federal revenues, or 1.7 percent of GDP. Today, payroll taxes as a whole account for 34 percent of federal revenues, or 5.9 percent of GDP.