The IRS was founded in 1862 as a temporary tax agency during the Civil War

The Internal Revenue Service did not exist as a permanent federal agency until much later, but its origins trace to 1862, when Congress created the Office of Internal Revenue to fund the Civil War effort. That office collected income taxes, excise taxes, and stamp duties. The income tax itself was temporary — it was meant to expire when the war ended.

After the Civil War ended in 1865, the income tax was allowed to lapse. For the next 27 years, the federal government relied mainly on tariffs and excise taxes. The Office of Internal Revenue continued to exist but handled only excise and stamp taxes, not income tax.

In 1894, Congress passed a new income tax law, but the Supreme Court struck it down in 1895, ruling that a direct income tax on individuals was unconstitutional without apportionment among the states. This legal barrier stood until the 16th Amendment was ratified in 1913, which explicitly gave Congress the power to collect income tax without apportionment.

Key Takeaways

  • The Office of Internal Revenue was created in 1862 as a temporary wartime measure to fund the Civil War, not as a permanent agency.
  • The income tax lapsed after the Civil War and did not return until 1913, when the 16th Amendment made it constitutional.
  • The modern IRS took its current name and structure in 1953, consolidating earlier revenue collection agencies into one organization.
  • The IRS operates under the Department of the Treasury and is responsible for collecting federal income taxes, employment taxes, excise taxes, and other federal revenues.

The IRS became a permanent agency in 1913

Once the 16th Amendment passed in 1913, Congress immediately enacted a new income tax law. The Office of Internal Revenue, which had been handling only excise and stamp taxes, suddenly became the primary tax collection agency for the federal government. The volume of work exploded — the first income tax in 1913 affected only about 3 percent of the population, but the number of taxpayers and the complexity of the tax code grew steadily.

Throughout the 1920s, 1930s, and 1940s, the agency expanded its staff and regional offices to handle the growing workload. During World War II, income tax withholding was introduced, which meant employers began deducting taxes from paychecks. This change made the agency's role even more central to federal revenue collection.

The IRS took its current name and structure in 1953

The agency operated under the name "Bureau of Internal Revenue" for decades. In 1953, it was reorganized and renamed the Internal Revenue Service (IRS). This reorganization was part of a broader effort to modernize the federal government after World War II and to create a more efficient tax collection system.

The 1953 reorganization also established the regional structure that still exists today. The country was divided into districts, each with its own director and staff. This decentralized approach was meant to bring tax administration closer to taxpayers and to distribute the workload more evenly across the nation.

The IRS is part of the Department of the Treasury

From its creation in 1862 onward, the revenue office reported to the Secretary of the Treasury. This relationship continues today — the IRS is a bureau of the Department of the Treasury, and the Treasury Secretary is the cabinet-level official responsible for federal tax policy and revenue collection.

Within the Treasury Department, the IRS operates with a Commissioner of Internal Revenue as its head. The Commissioner is appointed by the President and confirmed by the Senate. Below the Commissioner are regional offices, district offices, and local field offices that handle tax returns, audits, and enforcement.

What the IRS does today

The modern IRS collects federal income taxes from individuals and corporations, employment taxes (Social Security and Medicare withholding), excise taxes on specific goods, and estate and gift taxes. It also administers tax credits and deductions, processes tax returns, conducts audits, and pursues tax enforcement against those who do not pay what they owe.

The IRS also administers certain benefit programs that are delivered through the tax system. The Earned Income Tax Credit (EITC) and the Child Tax Credit are two major examples — they are claimed on tax returns and result in refunds for many low-income households. This role grew significantly after 1975, when the EITC was first introduced.

How the IRS has changed since its founding

The biggest change has been the shift from paper-based to digital record-keeping and filing. In 1862, tax returns were handwritten and stored in physical files. Today, most returns are filed electronically, and the IRS maintains digital databases of tax records going back decades.

The agency has also grown in size and complexity. In 1862, the Office of Internal Revenue employed a handful of people. By 2024, the IRS employs roughly 75,000 people across the country. The tax code itself has expanded from a few pages in 1913 to over 70,000 pages today, which has made the IRS's job of interpreting and enforcing the law far more complicated.

Staffing and funding have fluctuated over time. The IRS received significant budget increases in the 1990s and 2000s, but funding was reduced in the 2010s. In 2022, Congress passed the Inflation Reduction Act, which included substantial new funding for IRS operations and enforcement, marking one of the largest budget increases the agency has received in decades.

Frequently Asked Questions

Why was the IRS created in 1862 if income tax didn't become permanent until 1913?

The Civil War required immediate funding, so Congress created the Office of Internal Revenue in 1862 to collect various taxes — income tax, excise taxes, and stamp duties. After the war ended, the income tax was allowed to expire, but the office continued to collect excise and stamp taxes. It became a permanent income tax agency only after the 16th Amendment made income tax constitutional in 1913.

What was the Office of Internal Revenue called before it became the IRS?

It was called the Bureau of Internal Revenue from the late 1800s until 1953, when it was reorganized and renamed the Internal Revenue Service. The name change reflected a modernization effort and a shift toward a more decentralized, regional structure for tax administration.

Has the IRS always been part of the Treasury Department?

Yes. From 1862 onward, the revenue office reported to the Secretary of the Treasury. This relationship has remained unchanged — the IRS is a bureau within the Department of the Treasury and operates under the Treasury Secretary's authority.

Why did income tax disappear for 27 years after the Civil War?

Congress allowed the income tax to expire in 1865 because it was originally intended as a temporary wartime measure. The federal government returned to relying on tariffs and excise taxes. An 1894 attempt to reinstate income tax was struck down by the Supreme Court in 1895, which blocked income taxation until the 16th Amendment was ratified in 1913.