By the end of this section, you will be able to:
- Differentiate among a regressive tax, a proportional tax, and a progressive tax
- Identify major revenue sources for the U.S. federal budget
There are two main categories of taxes: those that the federal government collects and those that the state and local governments collect. What percentage the government collects and for what it uses that revenue varies greatly. The following sections will briefly explain the taxation system in the United States.
Just as many Americans erroneously think that federal spending has grown considerably, many also believe that taxes have increased substantially. The top line of Figure 1 shows total federal taxes as a share of GDP since 1960. Although the line rises and falls, it typically remains within the range of 17% to 20% of GDP, except for 2009, when taxes fell substantially below this level, due to recession.
Figure 1 also shows the taxation patterns for the main categories that the federal government taxes: individual income taxes, corporate income taxes, and social insurance and retirement receipts. When most people think of federal government taxes, the first tax that comes to mind is the that is due every year on April 15 (or the first business day after). The personal income tax is the largest single source of federal government revenue, but it still represents less than half of federal tax revenue.
The second largest source of federal revenue is the (captured in social insurance and retirement receipts), which provides funds for Social Security and Medicare. Payroll taxes have increased steadily over time. Together, the personal income tax and the payroll tax accounted for about 80% of federal tax revenues in 2014. Although personal income tax revenues account for more total revenue than the payroll tax, nearly three-quarters of households pay more in payroll taxes than in income taxes.
The income tax is a , which means that the tax rates increase as a household’s income increases. Taxes also vary with marital status, family size, and other factors. The (the tax due on the next dollar of income) for a single taxpayer range from 10% to 35%, depending on income, as the following Clear It Up feature explains.
How does the marginal rate work?
Suppose that a single taxpayer’s income is $35,000 per year. Also suppose that income from $0 to $10,000 is taxed at 10%, income from $10,001 to $36,900 is taxed at 15%, and, finally, income from $36,900 and beyond is taxed at 25%. Since this person earns $35,000, their marginal tax rate is 15%, but since the first $10,000 is only taxed at 10% they end up only paying about 13.6% of their total income in taxes.
The key fact here is that the federal income tax is designed so that tax rates increase as income increases, up to a certain level. The payroll taxes that support Social Security and Medicare are designed in a different way. First, the payroll taxes for Social Security are imposed at a rate of 12.4% up to a certain wage limit, set at $118,500 in 2015. Medicare, on the other hand, pays for elderly healthcare, and is fixed at 2.9%, with no upper ceiling.
In both cases, the employer and the employee split the payroll taxes. An employee only sees 6.2% deducted from his or her paycheck for Social Security, and 1.45% from Medicare. However, as economists are quick to point out, the employer’s half of the taxes are probably passed along to the employees in the form of lower wages, so in reality, the worker pays all of the payroll taxes.
We also call the Medicare payroll tax a ; that is, a flat percentage of all wages earned. The Social Security payroll tax is proportional up to the wage limit, but above that level it becomes a , meaning that people with higher incomes pay a smaller share of their income in tax.
The third-largest source of federal tax revenue, as Figure 1 shows is the . The common name for corporate income is “profits.” Over time, corporate income tax receipts have declined as a share of GDP, from about 4% in the 1960s to an average of 1% to 2% of GDP in the first decade of the 2000s.
The federal government has a few other, smaller sources of revenue. It imposes an —that is, a tax on a particular good—on gasoline, tobacco, and alcohol. As a share of GDP, the amount the government collects from these taxes has stayed nearly constant over time, from about 2% of GDP in the 1960s to roughly 3% by 2014, according to the nonpartisan Congressional Budget Office. The government also imposes an on people who pass large amounts of assets to the next generation—either after death or during life in the form of gifts. These estate and gift taxes collected about 0.2% of GDP in the first decade of the 2000s. By a quirk of legislation, the government repealed the estate and gift tax in 2010, but reinstated it in 2011. Other federal taxes, which are also relatively small in magnitude, include tariffs the government collects on imported goods and charges for inspections of goods entering the country.
State and Local Taxes
At the state and local level, taxes have been rising modestly as a share of GDP over the last few decades to match the gradual rise in spending, as Figure 2 illustrates. The main revenue sources for state and local governments are sales taxes, property taxes, and revenue passed along from the federal government, but many state and local governments also levy personal and corporate income taxes, as well as impose a wide variety of fees and charges. The specific sources of tax revenue vary widely across state and local governments. Some states rely more on property taxes, some on sales taxes, some on income taxes, and some more on revenues from the federal government.
The two main federal taxes are individual income taxes and payroll taxes that provide funds for Social Security and Medicare; these taxes together account for more than 80% of federal revenues. Other federal taxes include the corporate income tax, excise taxes on alcohol, gasoline and tobacco, and the estate and gift tax. A progressive tax is one, like the federal income tax, where those with higher incomes pay a higher share of taxes out of their income than those with lower incomes. A proportional tax is one, like the payroll tax for Medicare, where everyone pays the same share of taxes regardless of income level. A regressive tax is one, like the payroll tax (above a certain threshold) that supports Social Security, where those with high income pay a lower share of income in taxes than those with lower incomes.
Burman, Leonard E., and Joel Selmrod. Taxes in America: What Everyone Needs to Know. New York: Oxford University Press, 2012.
Hall, Robert E., and Alvin Rabushka. The Flat Tax (Hoover Classics). Stanford: Hoover Institution Press, 2007.
Kliff, Sarah. “How Congress Paid for Obamacare (in Two Charts).” The Washington Post: WonkBlog (blog), August 30, 2012. http://www.washingtonpost.com/blogs/wonkblog/wp/2012/08/30/how-congress-paid-for-obamacare-in-two-charts/.
Matthews, Dylan. “America’s Taxes are the Most Progressive in the World. Its Government is Among the Least.” The Washington Post: WonkBlog (blog). April 5, 2013. http://www.washingtonpost.com/blogs/wonkblog/wp/2013/04/05/americas-taxes-are-the-most-progressive-in-the-world-its-government-is-among-the-least/.
- corporate income tax
- a tax imposed on corporate profits
- estate and gift tax
- a tax on people who pass assets to the next generation—either after death or during life in the form of gifts
- excise tax
- a tax on a specific good—on gasoline, tobacco, and alcohol
- individual income tax
- a tax based on the income, of all forms, received by individuals
- marginal tax rates
- the tax rate that must be paid on the next dollar of income
- payroll tax
- a tax based on the pay received from employers; the taxes provide funds for Social Security and Medicare
- progressive tax
- a tax that collects a greater share of income from those with high incomes than from those with lower incomes
- proportional tax
- a tax that is a flat percentage of income earned, regardless of level of income
- regressive tax
- a tax in which people with higher incomes pay a smaller share of their income in tax
a tax based on the income, of all forms, received by individuals
a tax based on the pay received from employers; the taxes provide funds for Social Security and Medicare
a tax that collects a greater share of income from those with high incomes than from those with lower incomes
the tax rate that must be paid on the next dollar of income
a tax that is a flat percentage of income earned, regardless of level of income
a tax in which people with higher incomes pay a smaller share of their income in tax
a tax imposed on corporate profits
a tax on a specific good—on gasoline, tobacco, and alcohol
a tax on people who pass assets to the next generation—either after death or during life in the form of gifts