Treasury Bonds Explained: How US Government Debt Works and Why It Matters

By James Whitfield, CFA  ·  June 1, 2026  ·  10 min read

US Treasury securities are the bedrock of the global financial system. They are used as collateral in trillions of dollars of transactions daily, they set the "risk-free rate" that underpins every other asset valuation in the world, and they are the primary tool through which the federal government borrows money to fund its operations. Yet many individual investors treat Treasuries as an afterthought — something retirees hold to be safe — without understanding how they work, why they matter for equity valuations, or how to use them strategically.

This guide covers the full picture: the different types of Treasury securities, how the auction process works, what the yield curve tells us about the economy, why Treasury yields affect everything from your mortgage rate to the price-to-earnings multiple on stocks, and how to buy Treasuries directly or through funds.

The Four Types of Treasury Securities

The US Department of the Treasury issues debt across a range of maturities and structures. Understanding the differences is the starting point.

Treasury Bills

T-bills are the simplest Treasury instrument. They are issued at a discount — meaning you pay less than face value — and receive the full face value at maturity. The difference is your return. A 52-week T-bill purchased for $950 and maturing at $1,000 yields approximately 5.26%. There are no coupon payments; you simply receive the face value when the bill matures. T-bills are the closest thing in financial markets to a truly risk-free investment, and their yield is widely used as a proxy for the risk-free rate in financial models.

Treasury Notes and Bonds

Notes (2–10 year maturities) and bonds (20–30 year maturities) pay a fixed coupon rate semiannually. The coupon is set at issuance based on prevailing market rates; after issuance, the price of the security fluctuates in the secondary market so that its yield matches current market rates. This inverse relationship between bond prices and yields is fundamental: when rates rise, existing bond prices fall, and vice versa.

The 10-year Treasury note yield is arguably the single most important number in global finance. It is the benchmark rate against which mortgages, corporate bonds, and equity valuations are measured. When the 10-year yield rises significantly, it creates headwinds for nearly every asset class.

TIPS: Treasury Inflation-Protected Securities

TIPS are uniquely structured to protect against inflation. The principal value of a TIPS adjusts daily based on the Consumer Price Index (CPI). If you hold $10,000 in TIPS and inflation runs at 3% over the year, your principal grows to $10,300. Your coupon payment is a fixed percentage of the (now higher) principal — so you earn more in nominal terms when inflation is higher. At maturity, you receive the greater of the inflation-adjusted principal or the original face value (providing deflation protection as well).

The yield on TIPS is a "real yield" — stripped of inflation compensation. The difference between a nominal Treasury yield and the equivalent TIPS yield is called the breakeven inflation rate: the market's implied forecast of future inflation. If the 10-year Treasury yields 4.5% and the 10-year TIPS yields 2.0%, the breakeven is 2.5% — meaning markets expect roughly 2.5% average annual inflation over the next decade.

How Treasury Auctions Work

The Treasury does not sell new debt by calling up banks and asking for a price. It runs a formal competitive auction process called a Dutch auction (or uniform-price auction), which ensures transparent price discovery and equal treatment for all buyers.

Here is how a typical auction unfolds:

1. Announcement: The Treasury announces the auction details — the security type, maturity, offering amount, and auction date — typically a week or more in advance.
2. Competitive bidding: Primary dealers (large banks like JPMorgan, Goldman Sachs, and Citi that are authorized to trade directly with the Federal Reserve) submit bids specifying the yield they will accept and the amount they want to purchase.
3. Non-competitive bidding: Individual investors can submit non-competitive bids through TreasuryDirect.gov or their broker, agreeing to accept whatever yield the auction clears at. This guarantees they receive securities at the auction price without needing to guess the right yield.
4. Stop-out rate: The Treasury accepts competitive bids from the lowest yield upward until the offering is fully subscribed. The highest yield accepted is the "stop-out rate" or "high yield" — and every winning bidder (competitive and non-competitive alike) receives that same yield. This is the uniform-price feature: no one pays more than necessary.
5. Bid-to-cover ratio: The total bids received divided by the amount offered. A ratio above 2.0 indicates strong demand; a weak ratio can signal concern about the Treasury's ability to finance its debt at low yields.

The Yield Curve and What It Signals

The yield curve plots the yields of Treasury securities across different maturities — from 1-month T-bills to 30-year bonds — at a single point in time. Under normal conditions, the curve slopes upward: longer maturities yield more, because investors demand compensation for lending money for longer periods (duration risk) and for the uncertainty of future inflation.

The shape of the yield curve is one of the most watched macroeconomic indicators because it encodes the market's collective view of future growth and monetary policy:

The most commonly watched spread is the 2-year/10-year spread (the 10-year yield minus the 2-year yield). When this turns negative — meaning the 2-year yield exceeds the 10-year — the curve is "inverted." The New York Federal Reserve publishes a monthly recession probability model based on this spread; probabilities above 30% have historically corresponded to near-certain recessions within 12 months.

Why Treasury Yields Affect Everything

The 10-year Treasury yield is called the "risk-free rate" because it represents the return available from the safest possible investment — the full faith and credit of the US government — with a meaningful duration. Every other investment is priced relative to this benchmark.

Mortgages and Consumer Credit

The 30-year fixed mortgage rate closely tracks the 10-year Treasury yield, typically running 1.5–2 percentage points above it. When the 10-year yield jumped from 1.5% in early 2022 to 5% in late 2023, mortgage rates surged from around 3% to over 8% — the fastest increase in decades — crushing home affordability and housing market activity.

Corporate Bond Spreads

Corporate bonds are priced as a "spread" over equivalent-maturity Treasuries. An investment-grade corporate bond might yield 5.5% when the 10-year Treasury yields 4.5% — a spread of 100 basis points (1%). If Treasury yields rise, corporate bond yields typically rise too, even if the spread stays constant, because the underlying risk-free rate has shifted higher.

Equity Valuations

In the discounted cash flow (DCF) framework, the fair value of any stock is the present value of its future cash flows, discounted at a rate that incorporates the risk-free rate. When risk-free rates rise, the discount rate rises, and future cash flows are worth less today — which mechanically reduces fair-value estimates for stocks, especially long-duration growth stocks whose earnings are concentrated far in the future.

This explains the 2022 equity bear market: the Fed's rapid rate hikes pushed Treasury yields sharply higher, which repriced growth stocks downward even before earnings deteriorated. The NASDAQ Composite fell 33% in 2022 despite many of its constituent companies reporting solid earnings — the pain came primarily from multiple compression driven by higher discount rates.

TIPS vs. Nominal Treasuries: When to Use Each

The choice between TIPS and nominal Treasuries comes down to your inflation outlook relative to current breakeven rates:

• Buy TIPS if you believe actual inflation will exceed the breakeven rate implied by the current gap between nominal and TIPS yields. If breakevens are 2.3% but you expect 3.5% inflation, TIPS will outperform.
• Buy nominal Treasuries if you believe inflation will come in below the breakeven rate. If breakevens price 2.3% inflation but you expect deflation or very low inflation, nominal bonds will outperform.
• Hold both if you are uncertain — a barbell of nominal Treasuries and TIPS provides inflation protection without entirely sacrificing nominal yield.

For practical portfolio purposes, the most straightforward TIPS exposure is through the iShares TIPS Bond ETF (TIP) or Vanguard Short-Term Inflation-Protected Securities ETF (VTIP). The shorter-duration VTIP is less sensitive to interest rate changes, which makes it more attractive when real yields are rising.

The Role of Treasuries in a Portfolio

Treasuries serve multiple functions that go beyond simply "earning interest":

Flight-to-Quality Diversification

During equity market crises, investors historically have rushed into Treasuries as a safe haven, causing bond prices to rise. This negative correlation with stocks — the tendency for Treasuries to appreciate when stocks fall — is the foundation of the traditional 60/40 stock-bond portfolio. However, this relationship is not guaranteed. In 2022, both stocks and bonds fell sharply as inflation spiked, breaking the negative correlation and exposing the limitations of relying on Treasuries as a pure hedge.

Cash Management and Liquidity

Short-term T-bills — particularly 3-month and 6-month maturities — are an excellent home for emergency funds and short-term savings. In the 2023–2025 environment with yields above 5%, T-bills offered far better returns than most savings accounts with equal or better safety. Unlike bank accounts, T-bill interest is exempt from state and local income taxes (though not federal), which improves their after-tax yield for investors in high-tax states.

Duration Management in Bond Ladders

A Treasury bond ladder — holding bonds that mature at regular intervals (e.g., every year from 1 to 10 years) — provides predictable cash flows, manages reinvestment risk, and avoids the need to time the market. As each rung matures, you reinvest at current rates. If rates rise, you benefit from higher reinvestment yields; if rates fall, you still hold bonds purchased at higher yields. This strategy is particularly well-suited for retirement income planning.

How to Buy Treasuries

Individual investors have three main options for accessing Treasury securities:

1. TreasuryDirect.gov: Buy new-issue Treasuries directly from the government with no commission. Best for buy-and-hold investors who want to hold to maturity. The interface is dated but functional, and the cost is unbeatable — zero.
2. Brokerage account: Buy new-issue or secondary-market Treasuries through your brokerage. Most major brokers offer T-bill auctions with no commission. Secondary market purchases may involve a small markup but provide more liquidity and flexibility to sell before maturity.
3. Treasury ETFs and mutual funds: Funds like BIL (SPDR 1–3 Month T-Bill ETF), SHY (iShares 1–3 Year Treasury Bond ETF), IEF (iShares 7–10 Year Treasury Bond ETF), and TLT (iShares 20+ Year Treasury Bond ETF) provide instant diversification and intraday liquidity. The trade-off is the expense ratio (0.03%–0.15%) versus buying Treasuries directly.

Treasuries may lack the excitement of equity investing, but their role as the global risk-free benchmark — and their practical utility for cash management, inflation protection, and portfolio stabilization — makes them an indispensable part of a complete investment education.