Treasury Securities: T-Bills, T-Notes, T-Bonds, and TIPS Explained

Treasury securities represent the primary instrument through which the U.S. federal government borrows money from domestic and international investors. The four main categories — Treasury bills, Treasury notes, Treasury bonds, and Treasury Inflation-Protected Securities — differ in maturity length, interest payment structure, and sensitivity to inflation. Understanding these distinctions is foundational to interpreting the broader landscape of government debt management and fiscal operations.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps
• Reference table or matrix

Definition and scope

The U.S. federal government's outstanding publicly held debt exceeded $26 trillion as of fiscal year 2023 (U.S. Bureau of the Fiscal Service, Monthly Treasury Statement), and Treasury securities constitute the mechanism by which that debt is financed. Each security is a direct obligation of the U.S. government, backed by the full faith and credit of the United States under 31 U.S.C. § 3102–3104.

Treasury securities are issued by the U.S. Department of the Treasury through the Bureau of the Fiscal Service and sold to the public via competitive and noncompetitive auctions administered through TreasuryDirect and the Federal Reserve's auction system. Purchases can be made through TreasuryDirect accounts, financial institutions, or broker-dealers.

The four instrument types serve distinct financing and investment functions:

• Treasury bills (T-Bills): Short-term instruments maturing in 4, 8, 13, 17, 26, or 52 weeks.
• Treasury notes (T-Notes): Intermediate instruments maturing in 2, 3, 5, 7, or 10 years.
• Treasury bonds (T-Bonds): Long-term instruments with a 20- or 30-year maturity.
• Treasury Inflation-Protected Securities (TIPS): Inflation-indexed instruments available in 5-, 10-, and 30-year maturities.

Savings bonds (Series EE and Series I) are a separate retail instrument class and are not auctioned; they are discussed in greater detail on the savings bonds overview page.

Core mechanics or structure

T-Bills are issued at a discount to face value. An investor purchases a 26-week bill at, for example, $980 and receives $1,000 at maturity — the $20 difference constituting the return. T-Bills pay no periodic coupon; the yield is entirely embedded in the purchase discount. The minimum purchase amount is $100 (TreasuryDirect, Treasury Bills).

T-Notes pay a fixed coupon rate semiannually and return face value at maturity. The coupon rate is set at auction based on market demand. A 10-year note paying a 4.5% coupon on a $1,000 face value generates $45 per year in two $22.50 payments. Secondary market prices fluctuate inversely with interest rates.

T-Bonds operate identically to T-Notes in coupon structure but carry maturities of 20 or 30 years. Their longer duration makes their prices significantly more sensitive to changes in prevailing interest rates — a property formally measured as modified duration. A 30-year bond has substantially higher duration risk than a 5-year note holding all else equal.

TIPS carry a coupon rate, but the principal is adjusted semiannually according to changes in the Consumer Price Index for All Urban Consumers (CPI-U), as published by the U.S. Bureau of Labor Statistics (BLS, Consumer Price Index). When inflation rises, the principal increases; coupon payments, calculated as a fixed percentage of the adjusted principal, rise accordingly. If deflation occurs, the principal declines, but at maturity investors receive no less than the original face value — a deflation floor built into the instrument by statute.

Interest from all four instrument types is subject to federal income tax but exempt from state and local income taxes under 31 U.S.C. § 3124.

Causal relationships or drivers

Several interconnected factors drive demand, pricing, and issuance patterns across Treasury security types.

Federal deficit financing: When the federal government runs a deficit, the Treasury must issue new securities to cover the gap between outlays and revenues. Larger deficits mechanically increase supply; holding demand constant, higher supply pushes yields up. The relationship between national debt management and issuance volume is direct and structural.

Federal Reserve policy: The Federal Reserve's target for the federal funds rate anchors short-term yields. When the Fed raises rates, newly auctioned T-Bill yields rise to reflect the new rate environment. Long-term bond yields are influenced more by inflation expectations and term premium than by the federal funds rate directly.

Inflation expectations: TIPS pricing reflects the market's implied inflation forecast through the "breakeven inflation rate" — the yield difference between a nominal Treasury and a same-maturity TIPS. If the 10-year nominal yield is 4.2% and the 10-year TIPS yield is 1.8%, the implied 10-year breakeven inflation rate is 2.4%. This breakeven is tracked closely by the Federal Reserve as a real-time indicator of market inflation expectations.

Flight-to-safety demand: During financial stress events, global demand for Treasury securities increases as investors reduce risk exposure. This demand suppresses yields, sometimes to negative real levels for shorter maturities.

Foreign official holdings: Foreign central banks and governments held approximately $7.7 trillion in U.S. Treasury securities as of 2023 (U.S. Department of the Treasury, Major Foreign Holders of Treasury Securities), making foreign demand a structural driver of Treasury pricing.

Classification boundaries

The four instruments are formally classified under 31 U.S.C. § 3102 (bills) and § 3103 (bonds and notes). The Treasury treats "notes" and "bonds" as distinct categories primarily by maturity at original issuance — instruments with original maturity of 10 years or less are notes; those beyond 10 years are bonds. TIPS are a subclass of notes or bonds depending on maturity (TreasuryDirect, TIPS).

Floating Rate Notes (FRNs) represent a fifth category — introduced in 2014 — with a 2-year maturity and quarterly coupon payments indexed to the most recent 13-week T-Bill rate. FRNs are not discussed in depth on this page but are part of the full marketable securities family.

Non-marketable securities (primarily savings bonds) are issued to retail investors and cannot be traded on secondary markets. Marketable Treasury securities — T-Bills, T-Notes, T-Bonds, TIPS, and FRNs — are freely transferable after issuance and traded in the world's largest and most liquid government bond market.

Tradeoffs and tensions

Duration risk vs. yield: Longer-maturity instruments typically offer higher yields to compensate investors for committing capital over a longer period. However, a 30-year bond's price will decline substantially more than a 1-year bill's price for any given increase in interest rates. A 1-percentage-point rise in yields reduces a 30-year bond's price by roughly 15–20% depending on coupon structure, while a 26-week bill's price movement is negligible.

TIPS vs. nominal bonds — real yield uncertainty: TIPS protect purchasing power only if actual CPI-U inflation exceeds the breakeven rate. If realized inflation falls short of the breakeven, nominal bond holders outperform TIPS holders. Investors must assess the probability distribution of inflation outcomes, not simply whether inflation will be "high" or "low."

Liquidity premium across the curve: On-the-run securities (most recently issued for a given maturity) trade at tighter bid-ask spreads than off-the-run securities of the same maturity. This means investors accepting slightly lower yields for on-the-run issues receive superior liquidity in return — a tradeoff relevant to institutional portfolio management.

Short vs. long financing from the government's perspective: The Treasury faces a tension in debt maturity composition: issuing short-term bills reduces current borrowing costs (assuming an upward-sloping yield curve) but increases refinancing risk if rates rise before roll-over. Issuing long-term bonds locks in rates but at higher initial cost. The Office of Debt Management publishes a quarterly refunding statement disclosing issuance decisions and the rationale behind maturity mix choices.

Common misconceptions

Misconception: Treasury bonds are risk-free. Treasury securities carry no credit default risk under normal conditions, but they do carry interest rate risk, inflation risk (for nominal instruments), and reinvestment risk. The term "risk-free" in finance refers exclusively to credit risk and applies only as a convention.

Misconception: T-Bill yields directly equal the federal funds rate. The federal funds rate influences but does not determine T-Bill yields. T-Bill yields are set at auction by market participants and can diverge from the federal funds rate based on supply, demand, collateral value, and market conditions.

Misconception: TIPS are always superior during inflation. If TIPS are purchased at high real yields already priced into valuations — for example, when the 10-year TIPS yield exceeds 2% — they may not outperform nominal bonds even in inflationary environments. The relative performance depends on realized inflation versus the breakeven at time of purchase.

Misconception: Secondary market price changes affect the original investor's return. For investors who hold to maturity, secondary market price fluctuations are irrelevant. The coupon payments and par value at maturity are contractually fixed (or CPI-adjusted for TIPS) regardless of trading prices.

Misconception: TIPS principal can fall below original face value at maturity. As noted under core mechanics, the deflation floor provision ensures TIPS mature at no less than their original face value, even if cumulative CPI changes are negative over the holding period.

Checklist or steps

Steps for verifying Treasury security characteristics before purchase or analysis:

1. Identify the instrument type — confirm whether the security is a T-Bill, T-Note, T-Bond, TIPS, or FRN by CUSIP lookup on TreasuryDirect or the Federal Reserve Bank of New York's FRED database.
2. Confirm maturity date and original issue date — these determine whether the security is on-the-run or off-the-run and its remaining duration.
3. Locate the coupon rate — T-Bills have no coupon; all others carry a stated annual rate paid semiannually.
4. For TIPS: check the current index ratio — the index ratio reflects cumulative CPI-U adjustment since original issuance and affects the current adjusted principal and thus the effective coupon payment.
5. Identify the tax treatment — federal taxability applies to all four types; state and local exemption applies under 31 U.S.C. § 3124.
6. Verify auction versus secondary market acquisition — price, yield, and accrued interest calculations differ between primary auction purchases and secondary market transactions.
7. Cross-reference yield data — the Treasury yield curve published daily by the U.S. Department of the Treasury provides par yields for standard maturities as a benchmark.

Reference table or matrix

Sources: TreasuryDirect Marketable Securities, 31 U.S.C. § 3102–3104