The IRS was founded in 1862 as the Office of Internal Revenue
The Internal Revenue Service did not exist until the Civil War forced the federal government to find new money. In 1862, Congress created the Office of Internal Revenue as a temporary measure to tax income, alcohol, and tobacco to pay for the war effort. The office was part of the Treasury Department, and it stayed that way. When the war ended in 1865, the income tax was repealed, but the agency itself remained.
The name changed to the Bureau of Internal Revenue in 1913, the same year the 16th Amendment made a permanent federal income tax constitutional. That amendment allowed Congress to tax income without apportioning it among the states — a power it did not have before. The bureau kept growing as income tax became the government's main source of revenue. It was not called the Internal Revenue Service until 1953, when it was reorganized and renamed.
Key Takeaways
- The IRS began in 1862 as the Office of Internal Revenue, created to fund the Civil War through taxes on income, alcohol, and tobacco.
- The agency became permanent even after the income tax was repealed in 1865, because the government needed ongoing revenue sources.
- The 16th Amendment in 1913 made a permanent federal income tax legal, and the bureau expanded to handle it.
- The agency took its current name, the Internal Revenue Service, in 1953 as part of a major reorganization.
Why the Civil War forced the creation of a tax agency
The federal government before 1862 relied mainly on tariffs — taxes on imported goods — to fund itself. The Civil War was expensive, and tariffs alone could not cover the cost of armies, supplies, and weapons. Congress needed a new source of money fast, so it created the Office of Internal Revenue to collect taxes directly from people and businesses inside the country.
The first taxes the agency collected were on income, but also on luxuries like alcohol and tobacco. These were meant to be temporary — a wartime measure only. Many people expected the income tax to disappear once the war ended, and it did. In 1872, Congress repealed the income tax entirely. But the Office of Internal Revenue stayed open, because the government still needed to collect taxes on alcohol, tobacco, and other goods.
How the 16th Amendment changed everything in 1913
For decades after the Civil War, the federal government tried to tax income again, but the Supreme Court blocked it. In 1895, the Court ruled that an income tax was unconstitutional without an amendment. Congress responded by proposing the 16th Amendment, which stated straightforward that Congress could tax income "without apportionment among the several States." The amendment was ratified in 1913.
That same year, the income tax came back permanently. The Bureau of Internal Revenue (as it was now called) suddenly had a much larger job. Millions of people and businesses now had to file tax returns and pay income tax every year. The bureau grew from a small office into a large agency with offices in every state. By the 1920s, it was one of the biggest federal agencies.
The reorganization that created the modern IRS in 1953
By the mid-20th century, the Bureau of Internal Revenue had become unwieldy. It was organized by geography — each state had its own regional office — but the system was inefficient and prone to corruption. In 1952, Congress ordered a complete reorganization. The agency was restructured by function instead of location, and it was renamed the Internal Revenue Service in 1953.
This reorganization created the structure that still exists today. The IRS was divided into divisions that handled different types of taxes and different types of taxpayers. The agency also began using computers in the 1960s, which allowed it to process millions of returns much faster than before. The modern IRS took shape during this period and has kept roughly the same structure ever since, though technology has changed dramatically.
What the IRS looked like in its first decades
In the 1860s and 1870s, the Office of Internal Revenue was small and local. Tax collectors were appointed by the government and worked out of local offices. They would visit businesses and homes to assess taxes owed. There was no standard form — the process was informal and varied from place to place. Corruption was common, because collectors had a lot of power and little oversight.
When the income tax returned in 1913, the process became more formal. Taxpayers had to file written returns and send them to the Bureau. The bureau hired thousands of clerks to sort, check, and file these returns by hand. Everything was done on paper. A return could take months to process. The system was slow, but it worked well enough for the number of people filing at the time.
How the IRS expanded after World War II
World War II brought another surge in tax revenue needs. The government raised income tax rates and lowered the threshold for who had to pay, bringing millions of new taxpayers into the system. The Bureau of Internal Revenue had to hire thousands more employees and open new offices. After the war, the number of taxpayers stayed high, and the agency stayed large.
The 1950s reorganization was partly a response to this growth. The agency needed a better structure to handle so many returns and so many taxpayers. The shift to a functional organization — with divisions for individual income tax, corporate tax, excise tax, and so on — made the agency more efficient. By the 1960s, the IRS was using computers to store and process tax data, which was revolutionary at the time.
The IRS today compared to its origins
The IRS of 2024 is vastly different from the Office of Internal Revenue of 1862, but the basic mission is the same: collect taxes owed to the federal government. The agency now processes over 150 million individual tax returns per year, mostly electronically. Taxpayers file online, and the IRS uses computers to check returns against income records from employers and banks.
The agency is also much larger and more complex. It has divisions for different types of taxes, different types of taxpayers, and different regions. It employs tens of thousands of people. It has enforcement divisions that investigate tax fraud and criminal cases. It has a criminal investigation unit that works with the FBI. None of this existed in 1862. But the core function — collecting the taxes Congress has authorized — remains unchanged.
Frequently Asked Questions
Was there an income tax before 1862?
No. The federal government before the Civil War funded itself almost entirely through tariffs on imported goods. An income tax was considered too invasive and was not politically possible. The Civil War created the financial pressure that made an income tax acceptable for the first time.
Why did the income tax come back after being repealed in 1872?
The Supreme Court blocked it for decades. Congress tried to reinstate an income tax in the 1890s, but the Court ruled it unconstitutional in 1895. The 16th Amendment, ratified in 1913, changed the Constitution to allow it. Once the amendment passed, Congress when ready brought back the income tax.
Did the IRS always have the power to audit people?
The agency has always had the power to examine tax returns and verify that the information is correct. But the formal audit process, with rules about what the IRS can ask for and how long it can take, developed over time. Modern audit procedures are much more regulated than they were in the early 1900s.
When did people start filing taxes electronically?
Electronic filing began in the 1980s, but it was optional and rare at first. Most people filed on paper. The IRS did not make e-filing the standard until much later. Today, the vast majority of returns are filed electronically, and the IRS is pushing to make it the only option.