US Treasury Bonds: How They Work and Whether They Belong in Your Portfolio

For investors looking for a safe, low-risk place to put their money, US Treasury bonds are worth understanding. Backed by the full faith and credit of the United States government, Treasury bonds are considered one of the safest investments available anywhere in the world, though like all investments, they come with trade-offs worth understanding before committing your money.

This guide covers how Treasury bonds work, where to buy them, how the secondary market operates, and how they compare to other low-risk alternatives.

How Do US Treasury Bonds Work?

A bond is essentially a loan, an agreement between a lender and a borrower where the borrower pays interest on the principal amount and returns the total amount at a set date. The interest rate on a bond is called the coupon rate, and the date the money is paid out is called the maturity date.

A US Treasury bond is a special type of bond issued by the United States government to raise money for governmental initiatives. When you purchase a Treasury bond, you are loaning money to the US government, and in return, the government promises to pay you a fixed rate of interest every six months until the bond matures, at which point you receive your original investment back.

For example, if you purchased a Treasury bond for $1,000 with a 4% coupon rate and a 30-year maturity date, you would receive $40 in interest payments each year, paid in two $20 installments every six months, and receive your original $1,000 back when the bond matures.

Key characteristics of Treasury bonds:

• Maturity: 30 years, though bonds with maturities of 10 to 30 years are available

• Interest payments: Twice per year at a fixed rate

• Tax treatment: Exempt from state and local taxes, subject to federal income tax

• Risk level: Considered essentially risk-free since they are backed by the US government

• Minimum purchase: $100 through TreasuryDirect.gov

The trade-off for this safety is a relatively modest yield compared to higher-risk investments. Since Treasury bonds are considered so safe, they typically offer lower yields than corporate bonds or other fixed-income securities.

Where Can You Buy US Treasury Bonds?

Treasury bonds are issued in denominations ranging from $100 up to $5 million per bidder at auction. They are sold through auctions conducted by the government and can be purchased in two ways:

TreasuryDirect.gov — the US government’s official platform for purchasing Treasury securities directly, with no broker fees or commissions. This is the most cost-effective option for most individual investors.

Through a broker — Treasury bonds can also be purchased through most major brokerages, including Vanguard, Fidelity, and Charles Schwab. This is convenient if you already have a brokerage account and want to hold Treasury bonds alongside other investments.

Bidders at auction do not control the price, it is set through the competitive auction process and must be accepted as offered.

Buying and Selling Treasury Bonds on the Secondary Market

After the initial auction, Treasury bonds can be bought and sold on the secondary market before they reach maturity. Here is how secondary market pricing works:

• Selling at a premium — if a bond is sold for more than its original purchase price, it is sold at a premium

• Selling at a discount — if a bond is sold for less than its original purchase price, it is sold at a discount

Treasury bonds have two distinct values on the secondary market:

• Face value — the original purchase price used to calculate the coupon interest rate

• Price value — the price at which the bond is sold in the secondary market

The amount you earn from a Treasury bond depends on the face value, the price you paid, and the coupon interest rate. For most individual investors, holding Treasury bonds to maturity is the most straightforward approach, collecting the fixed interest payments and receiving the face value at maturity without worrying about secondary market fluctuations.

Best Alternatives to Treasury Bonds

Treasury bonds are one of several low-risk investment options worth considering. Here is how they compare to some current alternatives:

Series I Savings Bonds

I Bonds are inflation-indexed savings bonds backed by the US government. The current composite rate for I Bonds issued May through October 2026 is 4.26%, combining a fixed rate with an inflation adjustment that resets every six months. I Bonds can be purchased for up to $10,000 per person per year through TreasuryDirect.gov and offer both federal tax deferral and state and local tax exemption on interest. For investors concerned about inflation eroding purchasing power, I Bonds can be a compelling complement to Treasury bonds.

Treasury Bills and Treasury Notes

For investors who do not want to commit to a 30-year maturity, shorter-term Treasury securities offer competitive alternatives:

• Treasury bills — mature in 4 to 52 weeks and are currently offering competitive short-term yields

• Treasury notes — mature in 2 to 10 years and pay interest every six months like Treasury bonds

All three types can be purchased through TreasuryDirect.gov with the same state and local tax exemption.

High-Yield Savings Accounts

High-yield savings accounts are currently offering up to 5.00% APY with full FDIC protection, significantly above the national average of 0.38%. For a savings balance of $15,000, a 5.00% APY translates to an additional $750 per year by simply choosing the right savings account. Unlike Treasury bonds, high-yield savings accounts offer full liquidity with no maturity date and no early redemption penalty.

For investors who want a safe place to park cash with immediate access, a high-yield savings account at an online bank or a division of First Citizens Bank, which now includes the former CIT Bank following their January 2022 merger, offers competitive rates worth comparing.

Bond ETFs

Exchange-traded funds focused on bonds allow you to invest in a diversified basket of Treasury bonds and other fixed-income securities rather than a single bond. Bond ETFs trade on the stock market just like a stock, offer more liquidity than individual Treasury bonds, and can be purchased commission-free through most major brokerages. For investors who want broad bond market exposure without managing individual bonds, a low-cost Treasury bond ETF is a straightforward option.

How Treasury Bonds Fit into a Diversified Portfolio

Treasury bonds work best as a conservative component of a diversified investment portfolio, providing stability and income while other assets, such as stocks and REITs, provide growth. They are particularly valuable for:

• Investors on a fixed income who need predictable, reliable interest payments

• Investors approaching retirement who want to reduce overall portfolio volatility

• Investors looking for state and local tax-exempt income

• Those seeking a true safe-haven asset during periods of economic uncertainty or market volatility

For military members, Treasury bonds can complement a TSP portfolio, particularly for those closer to retirement who want to shift their allocation toward more conservative investments. The TSP’s G Fund and F Fund already provide significant exposure to government and bond securities at extremely low cost, so military investors should evaluate whether separate Treasury bond purchases add meaningful diversification beyond what the TSP already provides.

Are US Treasury Bonds Right for You?

US Treasury bonds remain one of the safest investments available, backed by the US government with a long history of reliability. The state and local tax exemption, predictable interest payments, and the ability to hold to maturity without worrying about price fluctuations make them a valuable tool for conservative investors.

However, with high-yield savings accounts now offering competitive rates with full FDIC protection and I Bonds offering inflation-adjusted returns, Treasury bonds face more competition from other low-risk alternatives than they did in the low-rate environment of recent years. The right choice depends on your time horizon, liquidity needs, and overall portfolio strategy, and in many cases, a combination of Treasury securities, high-yield savings, and bond ETFs will serve most investors better than any single option alone.