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Payroll taxes fund social insurance programs including Social Security and Medicare and are the second-largest source of revenues for the federal government. In 2019, the most recent year for which data were not affected by temporary distortions resulting from the pandemic, payroll taxes made up 36 percent of total federal revenues. Most working Americans are subject to payroll taxes, which are usually deducted automatically from an employee’s paycheck. Employers are also often subject to those types of taxes.
A few other types of federal payroll taxes also fund smaller programs:
The portion of FICA taxes that is dedicated to Social Security is used to fund the Old-Age and Survivors Insurance and Disability Insurance programs, which provide income on a monthly basis to retirees, people with disabilities, and their families. Payroll taxes are the primary source of funding for those programs, accounting for 88 percent of all inflows into their trust funds in 2019.
Employers and employees each pay 7.65 percent of payroll in FICA taxes; the portion dedicated to Social Security is 6.2 percent and is only levied up to a maximum income level determined annually (the remaining 1.45 percent is designated for Medicare). Self-employed individuals also contribute to these funds through Self-Employment Contributions Act (SECA) taxes. The rates for SECA taxes are identical to those for FICA taxes, with the only difference being that the individual is responsible for paying both employee and employer portions of the tax.
The tax rate for Social Security was originally set in 1937 at 1 percent of taxable earnings and increased gradually over time. The current rate was set in 1990, although it has been modified twice in response to economic downturns. In 2011 and 2012, the rate for employees was temporarily lowered to help alleviate the hardship resulting from the Great Recession. To increase take-home pay during COVID-19, employers were allowed to defer withholding some of their employees’ share of payroll taxes for Social Security from September 1, 2020 through December 31, 2020. However, employers are responsible for withholding any deferred taxes from employee wages and paying them by the end of 2021.
In 2021, Social Security received $980 billion in revenue from payroll taxes, or 4.3 percent of gross domestic product (GDP). The remainder of the program’s inflows come from taxation on Social Security benefits as well as interest on the balances of the trust funds.
The Social Security payroll tax only applies up to a certain amount of a worker’s annual earnings; that limit is often referred to as the taxable maximum or the Social Security tax cap. For 2023, the maximum earnings subject to the Social Security payroll tax jumped to $160,200, an increase of $13,200 from the 2022 level.
When the tax dedicated to Social Security was first implemented in 1937, it was capped by statute at the first $3,000 of earnings (which would be equivalent to about $56,000 in 2021 dollars). Since 1975, the taxable maximum has generally been increased each year based on an index of national average wages. Each year, about 6 percent of the working population earns more than the taxable maximum, which has been the case since 1983.
Economists consider the Social Security tax to be regressive, because as an individual’s earnings increase above the cap, the portion of total earnings that is taxed decreases.
Proponents of increasing or eliminating the limit on earnings subject to the Social Security payroll tax argue that it would make the tax less regressive and be part of a solution to strengthen the Social Security trust funds. An analysis from the Congressional Budget Office estimated that phasing out the tax cap by subjecting earnings below the current taxable maximum and above $250,000, would have raised over $1 trillion in revenues from 2019 through 2028. Another argument is that removing the taxable maximum would adjust for the fact that higher-income individuals generally have longer life expectancies and thus receive Social Security benefits for a greater amount of time.
Opponents argue that increasing or removing the taxable maximum would weaken the link between the amount individuals pay in Social Security taxes and the amount they receive in retirement benefits. Opponents also contend that while low-income earners may pay a greater share of their income in Social Security taxes than those who are wealthier, they also receive a disproportionate share of government transfer payments that are not subject to the tax. Those opponents cite programs that have been created to — at least partially — offset the regressive nature of the Social Security payroll tax.
Some economists anticipate that if the limit were lifted, employers might respond by shifting taxable compensation to a form of compensation that is taxed at a lower rate. For example, employers could decrease wages but increase retirement benefits, which are deductible under the corporate income tax, in an effort to offset the additional payroll taxes they would owe.
Employees and employers each contribute 1.45 percent of earnings by workers to Medicare, which is levied on all income. Since 2013, an additional 0.9 percent tax has been imposed on employees with earnings exceeding a threshold between $125,000 and $250,000 depending on filing status; those additional taxes are not matched by the employer.
The revenue from payroll taxes help fund Medicare’s Hospital Insurance (HI) program, which is used to pay for hospital stays and a few forms of home healthcare, such as hospice care. For 2019, HI tax revenues were 1.3 percent of GDP, an amount that has been relatively constant for 25 years. The HI tax was originally the primary source of revenues for Medicare before the program grew to include Medicare Advantage plans and prescription drug coverage. The taxes dedicated to HI now make up 36 percent of Medicare’s total inflows, a share that is projected to decrease going forward.
In addition to FICA or SECA taxes, a few other payroll taxes are levied on certain employees:
Many countries in the Organisation for Economic Co-operation and Development (OECD), a group of nations with high-income economies, also fund their social insurance programs with payroll taxes. While the Social Security systems of other countries take different forms, most provide government-financed pensions that provide income assistance for retirees, similar to that of the United States.
Despite that similarity, there is much variation in how other OECD countries impose payroll taxes on their citizens. Countries such as the Netherlands, Sweden, Germany, and Canada have caps on taxable earnings that are lower than in the United States; others, such as Norway and Ireland, tax all earnings. Generally, countries with higher payroll tax rates have lower caps, while countries with lower payroll tax rates, like the United States, tend to have higher caps or no caps at all. In some OECD countries, social insurance programs are funded through other sources such as income taxes or excise taxes.
Certain countries, like the United Kingdom and Austria, have a bracketed payroll tax structure that levies the payroll tax at different rates depending on total income, similar to how the United States levies income taxes. In the United Kingdom, that bracketed system is regressive in structure, while in Austria it is progressive.
Payroll taxes are an important component of America’s system of taxation and they fill an essential role in keeping social insurance programs funded and operational. Payroll taxes represent the second-largest source of federal revenues, after income taxes. On the household level, payroll taxes are often the primary federal tax an individual will incur; in fact, about two-thirds of households pay more in payroll taxes than income taxes, according to the Tax Policy Center.
Social insurance programs, primarily Social Security and Medicare, face serious financial challenges. Those challenges will likely accelerate due to the decline in economic activity and payroll tax revenues caused by the COVID-19 pandemic and legislation in response to it. Understanding how programs are funded through payroll taxes is important for developing reforms that will ensure that those programs can continue to provide benefits to the recipients who depend on them.