What Is the U.S. Treasury?: Functions & Importance

By Kristi Waterworth – Updated Jul 5, 2025 at 6:01 PM EST

Key Points

U.S. Treasury influences global economy, manages national finances, and ensures financial law enforcement.
Treasury securities like bonds, bills, and notes are stable investments, key to portfolio diversification.
Inverted yield curves in Treasury securities suggest potential economic downturns, demanding investor vigilance.

Whether you're an investor or a student of government history, the U.S. Treasury is an incredibly interesting structure with wide-ranging influence over your particular areas of interest. Find out more about how it started, where it is now, and how it affects investors.

The U.S. Treasury building. — Image source: Getty Images.

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What is the U.S. Treasury?

The U.S. Department of the Treasury, also known as the U.S. Treasury or the Treasury Department, is part of the executive branch and is responsible for much of the country's financial security. It not only maintains and monitors the country's economic and financial systems but also influences the world economy.

The U.S. Treasury is made up of nine bureaus and 16 offices:

Bureaus

The Alcohol and Tobacco Tax and Trade Bureau
The Bureau of Engraving & Printing
The Bureau of the Fiscal Service
The Financial Crimes Enforcement Network (FinCEN)
The Inspector General
The Treasury Inspector General for Tax Administration (TIGTA)
The Internal Revenue Service (IRS)
The Office of the Comptroller of the Currency (OCC)
The U.S. Mint

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Offices

Diversity, Equity, Inclusion, and Accessibility
Domestic Finance
Economic Policy
General Counsel
Inflation Reduction Act
International Affairs
Legislative Affairs
Management
Financial Research
Financial Stability
Public Affairs
Recovery Programs
Tax Policy
Terrorism and Financial Intelligence (TFI)
Treasurer of the United States
Tribal and Native Affairs

History of the U.S. Treasury

Although a treasury of sorts existed in the American colonies, it wasn't the same as the Department of Treasury, which was established in September 1789, shortly after the First Congress of the United States convened in March of the same year. It originally comprised just the secretary of the Treasury, a comptroller, an auditor, a treasurer, a register, and an assistant to the secretary of the Treasury. Alexander Hamilton was the first Treasury secretary.

Several departments have been temporarily under the control of the U.S. Treasury, including the Postal Service (until 1829), the Coast Guard (until 1967), and the Bureau of Narcotics, which is the precursor of the Drug Enforcement Agency. The Treasury Department has always been a very important, very central power in the United States government.

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What does the U.S. Treasury do today?

The U.S. Treasury Department has a hand in virtually everything related to the country's finances and financial policies. Although its duties have changed over time, it has remained a steady overseer of the country's budget and money supply since its founding.

Not only does the U.S. Treasury manage the federal government's finances and collect taxes and other money due to the United States, but it's also in charge of currency and coins, supervising national banks and thrift institutions, enforcing finance and tax laws, prosecuting tax evaders and other financial criminals, and advising other governmental departments on domestic and international financial and economic policies.

What are Treasury bonds, bills, and notes?

For investors, the U.S. Treasury is vital. After all, it issues Treasury bonds, bills, and notes and sells them to individuals and institutional investors. These are considered the most stable investments you can make outside of a traditional savings account since they can default only if the actual government goes under. At that point, your biggest problem isn't that your investment is belly-up.

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Treasury Bills (T-Bills)

A short-term debt issued and backed by the government, offering a low-risk investment with maturity typically under a year.

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Treasury bonds, bills, and notes themselves are really useful for investors looking to grow their holdings without risking them. However, they also work together to create strong economic indicators when compared to one another.

For example, the inverted yield curve has been considered a sign of impending recession. You can see the yield curve by comparing either the interest rates of 10-year Treasury bonds to two-year Treasury bonds or 10-year Treasury bonds to three-month Treasury bills. Academics tend to compare bonds to bills, but traders may prefer bonds to bonds.

Related investing topics

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How Treasury Bonds Work and How to Invest in Them

Issued by the U.S. government to raise money, T-bonds should have a place in your portfolio.

How to Calculate the Price of a Treasury Bill

Discover the security of Treasury bills, master the easy price calculation, and understand interest integration.

How to Calculate the Percentage Return of a Treasury Bill

A T-bill is a short-term government debt security that doesn't pay interest, so calculating its return is slightly different.

A History of U.S. Stock Market Crashes

What goes up must come down. Here's a look at the biggest stock market crashes.

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However you slice it, when the long-term debt's yield is smaller than the short-term debt's yield, it's generally considered a sign of instability on the horizon. Although the yield curve has been inverted since 2022 -- which should have predicted a recession 12 to 18 months later -- we're still waiting for that incoming recession to hit. The inverted yield curve does not guarantee problems to come, but it means we should all be paying attention.

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About the Author

Kristi Waterworth has been a contributing real estate and financial expert at The Motley Fool, covering real estate, investing, and personal finance topics, since 2020. Kristi has been interviewed by various TV media outlets and podcasts for her real estate investing expertise – from residential real estate to digital real estate and everything in between. Kristi’s journalist career spans over 25 years, and she has written about real estate investing, homeownership, and home construction specifically for the last decade. She was also previously a licensed Realtor and general building contractor before the Great Recession and housing market collapse. She holds a bachelor’s degree in American history from Columbia College in Missouri.

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