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What Are Treasury Bills and How Do They Work

Treasury Bills, often called T-Bills, are short-term loans you can make to the United States government. When you purchase a Treasury Bill, you are essentially lending money to the federal government. In return, the government promises to pay you back with interest after a set period of time. Think of it like this: you give the government $1,000 today, and they promise to give you back slightly more than $1,000 on a specific future date.

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The U.S. Department of the Treasury issues these bills to fund government operations. Instead of the government borrowing from banks, it borrows directly from citizens and investors like you. This is one of the safest ways to invest money because the full backing of the U.S. government stands behind these bills. The U.S. government has never defaulted on its debt obligations in its history.

Treasury Bills come with different time periods. The most common options are 4 weeks, 8 weeks, 13 weeks, 26 weeks, and 52 weeks. The number of weeks tells you how long until the government pays you back. A 13-week T-Bill means you will receive your money back in approximately three months. A 52-week T-Bill means you will wait one year.

The way T-Bills generate income is slightly different from other investments. You do not receive interest payments along the way. Instead, you purchase the bill at a discount. For example, you might pay $990 for a T-Bill that matures at $1,000. When the bill matures, you receive the full $1,000, and that $10 difference represents your earnings. This discount method is called "issued on a discount basis."

According to the U.S. Department of the Treasury, as of 2024, Treasury Bills are one of the most widely held securities in the world. Over $2 trillion in T-Bills are held by investors globally. This popularity exists because they combine safety with reasonable returns. In recent years, T-Bill rates have ranged from near zero during certain periods to over 5 percent in 2023-2024, depending on market conditions and Federal Reserve policy.

Practical Takeaway: Understanding that T-Bills work as discounted loans to the government helps you see why they are considered safe and predictable. Unlike stock investments where values fluctuate daily, T-Bills have a fixed maturity date and a known return amount from the moment you purchase them.

Current Interest Rates and Recent Market Conditions

Interest rates on Treasury Bills change regularly based on economic conditions, inflation, and Federal Reserve decisions. In 2022 and 2023, the Federal Reserve raised interest rates significantly to combat inflation, which pushed T-Bill rates to their highest levels in many years. By late 2023, newly issued 4-week T-Bills were paying rates above 5 percent, and 52-week bills offered rates around 5.3 percent.

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These rates represent a substantial change from the years 2010 through 2020, when T-Bill rates hovered near zero percent. Many investors during that period earned almost nothing from Treasury Bills, which made them undesirable compared to other investments. The recent increase in rates has renewed interest in T-Bills as a way to earn money with minimal risk.

It is important to understand that T-Bill rates are determined through an auction process. The U.S. Department of the Treasury holds regular auctions where investors bid on bills. The rates that result from these auctions fluctuate based on demand. When many investors want to buy T-Bills, rates tend to be lower because the government does not need to offer high rates to attract buyers. When fewer investors are interested, the government raises rates to make the bills more attractive.

The Federal Reserve also influences T-Bill rates through its monetary policy decisions. When the Fed raises its benchmark interest rate, yields on Treasury Bills typically increase as well. Conversely, when the Fed lowers rates, T-Bill yields usually fall. As of early 2024, the Federal Reserve has paused rate increases and many financial observers expect that rates may eventually decline, though this is not certain.

Real-world example: An investor who purchased a $10,000 52-week Treasury Bill in September 2023 at a rate of 5.3 percent would have received $10,530 when it matured one year later. That same investor in 2019 would have earned only about $150 on a $10,000 investment due to the much lower rates available at that time. This difference illustrates how significant rate changes can be over different economic periods.

A guide about Treasury Bills will typically include tables showing historical interest rates, which help you understand rate trends over time. These historical perspectives demonstrate that the current rate environment is temporary and will change based on economic conditions.

Practical Takeaway: Checking current T-Bill auction results before making any purchase decision allows you to compare rates across different maturity lengths and make an informed choice about which time period works best for your situation.

Minimum Investment Amounts and Purchase Options

One common misconception about Treasury Bills is that you need a large amount of money to invest. In reality, the minimum investment for Treasury Bills is quite affordable for many people. The U.S. Department of the Treasury sets the minimum purchase at $100 for T-Bills. This means you could purchase a single T-Bill with as little as $100 of your own money.

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Beyond the $100 minimum, you can purchase T-Bills in increments of $100. So you could buy one bill for $100, or three bills for $300, or ten bills for $1,000. This flexibility makes Treasury Bills accessible to people with various income levels and savings amounts. You do not need to be wealthy to invest in T-Bills, though of course, the more you invest, the more income you will earn.

There are several ways to purchase Treasury Bills. The most direct method is through TreasuryDirect, which is the official government website where the Treasury holds auctions. You can create a free account on TreasuryDirect.gov, link it to your bank account, and bid on T-Bills during regularly scheduled auctions. The website walks you through the process step by step. You can hold T-Bills in a TreasuryDirect account indefinitely, and the government will pay you directly into your bank account when bills mature.

A second option is to purchase T-Bills through your bank or brokerage firm. Most banks and investment brokerages can purchase T-Bills on your behalf. The advantage of this method is that if you already have an account at your bank or brokerage, you can manage your T-Bill investment alongside your other accounts. The disadvantage is that banks and brokerages may charge small fees for this service, whereas TreasuryDirect charges no fees.

A third option involves purchasing T-Bills on the secondary market. After Treasury Bills are initially sold through auctions, some owners sell them to other investors before they mature. This secondary market for T-Bills exists through brokerages and financial firms. You can purchase a T-Bill that was originally issued weeks or months ago but still has time remaining before it matures. Prices on the secondary market fluctuate based on current interest rates and the amount of time remaining until maturity.

For someone just learning about T-Bills, a guide will typically explain the advantages and disadvantages of each purchase method. TreasuryDirect offers the lowest cost and most direct connection to the government, making it popular for individuals. Banks and brokerages offer convenience if you prefer managing all your investments in one location. The secondary market may be useful if you want to purchase a bill with a specific maturity date that does not align with upcoming auctions.

Practical Takeaway: Starting with TreasuryDirect and your initial $100 purchase allows you to learn how T-Bills work without significant complexity or cost. You can always expand to larger purchases or other purchase methods once you feel more confident.

Tax Implications and Reporting Requirements

Understanding the tax treatment of Treasury Bill earnings is essential for anyone considering this investment. The interest income you earn from T-Bills is subject to federal income tax, which means you must report this income on your annual tax return. However, earnings from T-Bills receive favorable tax treatment compared to some other types of income.

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Specifically, the interest income from Treasury Bills is exempt from state and local income taxes. This is a significant advantage if you live in a state with high income tax rates. For example, if