Before the 16th Amendment, US tax law required direct taxes to be directly apportioned to a state's population

The 16th Amendment paved the way for capital gains taxes

Ratified in 1913, the 16th Amendment paved the way for a far-reaching federal income tax and supercharged the country’s coffers. Before then, the US depended on import tariffs and so-called consumption taxes to raise revenue.

On July 1, 1862, the agency now known as the Internal Revenue Service was established and named the Bureau of Internal Revenue

It was created to collect the first-ever US income tax, which was created to help pay for the Civil War. After gaining their independence from Britain, Americans were skeptical about giving the federal government absolute power to collect federal income taxes. As a result, early US tax laws dictated that direct taxes, like income taxes, had to be directly apportioned to a state's population. The nation went back and forth on its federal tax laws multiple times. For instance, in 1872, the income tax from the Civil War was repealed. But it was revived in 1894, and then repealed again in 1895. In 1913, Congress passed the 16th Amendment, giving Congress the power to levy income taxes on individuals and corporations without apportioning the burden among the states in line with population, once and for all.

The US officially adopted an income tax in 1913

The US first levied income taxes during the Civil War, but modern income taxes became an American fixture in 1913. Two years earlier, Congress passed the 16th Amendment to give the government the right to tax individuals' and businesses' income. The US still technically levies the same federal income tax now as it did then—though it's evolved.

Over a century ago, fewer than 1% of Americans paid income taxes—but the cost of World War II prompted the federal government to greatly expand the number of people required to pay income taxes.

Individual income taxes are the federal government's primary revenue source, see a tracker that breaks down where the rest of the budget comes from

The US government historically makes nearly half of its total revenue last year from individual income taxes. But the US makes also makes money from a variety of other sources, including Medicare taxes and corporate income taxes. However, the federal government has run a deficit since 2001—reaching a peak of $3.13T in 2020.

How the federal income tax affected Prohibition

In the early 1900s, 30% to 40% of government tax revenue came from liquor, wine, and beer, a reliance that made Prohibition seem like a fiscal impossibility. But the passage of the federal income tax in 1913 changed the calculus, which helped allow the government to ban alcohol production and sales.

Tax policy can have a direct impact on the national debt, with past presidents' changes to tax codes inflating the deficit.

Revenue from tariffs goes to the US Treasury's general fund.

Death taxes are placed on a deceased person's estate

Death taxes can include liquid cash, property, stocks, or other financial assets they owned. There are two main types of death taxes in the US: the estate tax and inheritance tax. Death taxes are levied at the federal and state level, but are targeted towards the rich.

The IRS—a division of the US Treasury Department that enforces the Internal Revenue Code, collects taxes, and enforces tax laws—has been a frequent victim of arson over the years.

Americans between the ages of 45 and 55 pay nearly 30% of all income taxes, paying an average tax rate of around 17%.

Tariffs once fueled the US economy, historically serving as a primary source of revenue and a means to protect domestic industries.

The most taxed states in America

Some states in the US have higher taxes than others. Hawaii, for instance, has the highest total tax burden in the country at 13.9%, whereas Alaska has the lowest overall tax burden at 4.9%. New York has the highest individual income tax burden; and eight states have no individual income tax. See a map of the most-taxed US states here.

Why the rich don't pay taxes like you do

The system behind the US income tax isn't as straightforward as it looks. You earn money. Taxes get taken out. Case closed … right? Not exactly. In this episode of "1440 Explores," we break down how the US tax system actually works, from confusing deductions and misunderstood tax brackets to why the wealthiest Americans often end up paying a very different tax than everyone else.

Hawaii and New York have the highest tax burdens out of all US states, both exceeding 12% of income

The term "tax burden" in this case refers to property, income, sales, and excise taxes as a share of total personal income. Alaska and New Hampshire have the lowest total tax burdens in the US, both falling below 6%.

Read why some states are considering imposing a flat tax rate that isn't adjusted by income

Wisconsin was the first US state to impose a state income tax, close in time to when the federal income tax went into effect. Many states followed suit, but nine states to this day still don't levy wage-related taxes.

Capital gains taxes were first levied in the US in 1913

However, up until 1921, they were treated the same as ordinary income. Ever since then, rates have swung up and down.

See how income taxes in the US compare to those of other countries.

One in seven US tax dollars is collected by local governments

Local governments collect about $886B each year to support education, infrastructure, and public health. Roughly three-quarters of this funding comes from property taxes, with the rest sourced from sales, excise, and income taxes.

Understanding the low corporate tax rate in the US

Corporate taxes, which make up roughly a third of the federal government's revenue, have been calculated using a flat 21% rate since the Tax Cuts & Jobs Act of 2017. The current rate is considered low both by historic standards (it averaged over 50% in the 1950s and 1960s) and compared to other countries.

Charting where federal revenue comes from

About 50 percent of federal revenue comes from individual income taxes, 7 percent from corporate income taxes, and another 36 percent from payroll taxes that fund social insurance programs. See breakdown in charts here.

Most Americans take the standard tax deduction

A tax deductible is an expense that a taxpayer or business can subtract from adjusted gross income, reducing their taxable income and therefore reducing the amount of taxes owed. Governments often use tax deductibles as a way to reward people who do things that are considered beneficial to society, like charitable donations.

Map of each state's largest tax revenue source

While America’s federal government primarily raises revenue through personal and corporate income taxes, it's a different story for each of the 50 states. This map shows how every state raises tax revenue for government activities. New York and California, for instance, raise most of that money through personal income taxes, whereas Texas and Florida have sales tax as their largest sources of tax revenue. Click here to see the map.

See comparisons of different countries' taxation strategies

Taxes are a major revenue source for most countries, and how each government taxes citizens often reflects the country's economy. Developed countries tax at much higher rates than developing ones, and as a country grows its GDP, it also typically grows the proportional percentage of taxes it gains from its citizens.

Learn about loopholes in the American tax code, which involve everything from cat food to death to heavy machinery.

Learn how the US tax code works and why it's important

First published in 1926, the US Code is the official codification of federal statutes in the US. Title 26 of the US Code, for instance, lists all of the federal tax laws of the United States. A new edition is published every six years.

What America's 1% pays in taxes, by state

In the US, the top 1% of earners contribute 45% of all personal income taxes collected nationwide. But not all states are created equal when it comes to income tax. Some states are more dependent on the 1% than others for tax revenue. SmartAsset recently examined IRS tax return data to determine exactly how much the top 1% of earners in each state paid in taxes. Find your state here.

80% of Americans are bothered that some wealthy people don't pay their fair share of taxes

That's according to data from Pew Research Center. While most people are primarily taxed on their wages, many people in America's 1% derive much of their income from investments instead, which are often taxed at preferential capital gains rates. This structure was shaped by a series of legislative cuts that began in earnest with the 1978 Revenue Act and the 1981 Economic Recovery Tax Act.

Estate taxes are paid out of the estate, while inheritance taxes are paid by beneficiaries

When a person dies, any estate taxes owed are paid out of their finances before being transferred to their beneficiaries—unlike inheritance taxes that are paid by the beneficiaries themselves. In addition to a federal estate tax, 12 states and the District of Columbia have a state estate tax with varying rates.

Tariffs are taxes levied on goods imported from abroad.

Since 1913, Americans have paid income taxes at varying rates

In the 2020s, the top marginal tax rate has floated around 37%, relatively lower than previous eras. Some have called for boosting the rate significantly to tax the highest earners.

About one dollar in every six that are owed to the federal government aren't paid each year

That adds up to close to $1T in what's known as the "tax gap." Read a breakdown on the main drivers of tax evasion (distinct from legal tax avoidance) in the US.

Watch this video to learn how US tax brackets actually work.

Opponents of the federal estate tax began using the term 'death tax' in the 1940s to sway public opinion.

See a timeline of the IRS's history, including the introduction of standard deductions and the digitization of the filing process

The Commissioner of Internal Revenue was created in 1862 to take over federal tax collection after the President enacted a temporary income tax. That agency eventually became today's Internal Revenue Service.

Learn how tax credits are applied to income taxes

Tax credits are directly subtracted from the amount of money taxpayers owe on their annual income. Unlike tax deductions, credits reduce the owed amount while deductions reduce how much income is taxable. There are different types of tax credits that are either fully or partially paid out.

Read why the information Americans have about our tax system might be misleading

For many, filing taxes can be complicated and overwhelming. Some argue that the tax system obscures certain aspects of the US tax code, making it difficult for taxpayers to accurately assess potential reforms.

See how the federal estate tax has changed in the 21st century

In 2001, the government passed an act to completely repeal the tax. It was overturned in 2010. In 2017, the government increased the exemption threshold so fewer people would have to pay into the tax. In 2025, the exemption threshold was permanently set to $15M.

Death taxes have helped fund wars since the 1860s

Death taxes date back to 700 BCE and were used in Ancient Rome and Ancient Egypt. In the US, they've been used to finance wars since the Civil War, and have been levied on both the estate and beneficiary. The estate tax created during WWI to help finance war efforts is still in effect today.

Only 5 states have inheritance taxes

Unlike estate taxes, inheritance taxes paid by the beneficiary of the estate (the person who inherits the deceased person's financial assets). The federal government doesn't levy an inheritance tax, but five states do. They all have varying tax rates and rules.

How tax laws helped the federal government catch mob bosses during Prohibition

The IRS arrested top mob bosses during Prohibition after the Supreme Court ruled illegally-made income could be taxed. The IRS's biggest catch was Al Capone, who was charged with tax evasion and sentenced to 11 years in prison. But Capone wasn't the only bootlegger the IRS nabbed for tax evasion during this era.

Historically, only about 1% to 2% of Americans had to pay the federal estate tax

Recent IRS data shows that between 2011-16, that number dropped even lower: The federal estate tax only impacts about 0.2% of Americans. Death taxes typically only impact the rich, and the federal estate tax is no exception.

In addition to collecting taxes, issuing tax refunds, and performing audits, the IRS is tasked with enforcing the laws listed in the Internal Revenue Code

The Internal Revenue Code is also known as Title 26 of the US Code. It was enacted in 1925 and outlines income, estate, sales, payroll, and excise tax laws.

See how local, state, and federal governments divide the cost of public services

Federal, state, and local governments share responsibility for funding public services. Education, roads, and social programs are funded through a complicated mix of taxes and intergovernmental transfers.

How much tax you would owe on a $14M inheritance

“Death taxes” refer to estate and inheritance taxes—fees imposed on wealth transfers after someone passes. While the federal estate tax only applies to estates over $13.61 million in 2024, some states, like Washington, have their own taxes.

More than 15 states have estate or inheritance taxes—but Maryland is the only state with both

Eighteen states, and Washington, DC, have estate or inheritance taxes in place. Tax rates and thresholds vary per state, but most are less than the federal estate tax rate and threshold. This means an estate doesn't have to be as lucrative to be subjected to the taxes.

Most pensions are subject to federal income taxes

Those taxes kick in once someone starts taking distributions from their pension. Whether a pension is subject to state income taxes depends on the state and other factors. Learn more about how pensions are taxed in this article.

The US has carried debt since 1791

After the Revolutionary War, the US owed $75M to nations like France. Debt builds when spending exceeds revenue, funding programs, wars, and economic recovery efforts. Most debt is domestic, like Social Security bonds, with foreign nations also holding a share.

See which states contribute the most and least to the federal government.

Americans spend an average of $200 on tax preparation services like TurboTax and H&R Block

In 2025, about half of Americans were able to file taxes directly with the IRS for free. It was the second year of the agency's new program, which cuts out intermediaries. Though tax preparation has been free for many Americans, critics say tax companies upsell customers.