What Is a Treasury Bill (T-Bill)?

What Is a Treasury Bill (T-Bill)?

7 Min.

A Treasury Bill, also known as T-Bill, is a type of short-term debt obligation that is backed by the U.S. Treasury Department. These bills have a maturity period of one year or less, and are usually sold in denominations of $1,000, although some can reach a maximum denomination of $5 million. The interest rates on T-bills are determined by expectations of interest rates.


Within financial instruments, Treasury bills (T-Bills) emerge as short-term debt obligations of the U.S. government. Underpinned by the Treasury Department, these instruments boast a maturity of one year or less. Typically issued in $1,000 increments, certain T-Bills can attain a maximum denomination of $5 million through non-competitive bids, rendering them appealing to risk-averse investors.

To distribute these securities, the Treasury Department orchestrates auctions employing both competitive and non-competitive bidding methods. Non-competitive bids, also referred to as non-competitive tenders, determine their price based on the average of all competitive bids submitted. This ensures a seamless and structured process for investors seeking secure and low-risk investment opportunities.

Exploring Treasury Bills (T-Bills)

Treasuries, commonly known as T-bills, serve as a financial tool for the U.S. government to finance diverse public endeavors, encompassing initiatives like school and highway construction. Investors engaging in T-bill acquisitions effectively receive a government-backed IOU, establishing these instruments as a secure and risk-averse investment.

Typically, T-bills remain in the possession of investors until their designated maturity date. Nevertheless, some holders may opt for an early exit, capitalizing on short-term interest gains by liquidating their investment within the secondary market.

T-Bill Durations Unveiled

The maturation periods for T-bills vary, spanning a mere few days, with durations outlined by the Treasury at four, eight, 13, 17, 26, and 52 weeks. In times of anticipated rising interest rates, extended maturity timelines yield higher returns compared to their shorter counterparts. Conversely, when expectations point toward declining interest rates, longer maturities may exhibit reduced interest rates. Distinguishing between T-bills, T-notes, and T-bonds can be challenging. A helpful mnemonic is associating T-bills with short-term obligations, reflecting the urgency of imminent payment.

T-Bill Redemptions and Accrued Interest

T-Bills are initially issued at a discount, signifying a purchase price below the par value (also known as the face value). For instance, a $1,000 bill may be acquired by an investor for $950. When the bill reaches its maturity date, the investors receive the complete face value, which is also known as the par value. Should the face value exceed the purchase price, the variance represents the accrued interest for the investor.

T-Bills deviate from coupon bonds' conventional interest payment structure, lacking regular interest disbursements. Nevertheless, the interest component is inherent in the final payment made upon maturity.

Tax Implications of T-Bill Interest Income

Interest income derived from T-bills is exempt from state and local income taxes, presenting a tax advantage. However, it remains subject to federal income tax. For comprehensive tax details, investors are encouraged to consult the research division resources available on the TreasuryDirect website.

Methods of Acquiring T-Bills

Procuring T-bills is facilitated through two avenues: direct acquisition from the government or participation in the secondary market via a broker.

Acquiring T-Bills From TreasuryDirect

Freshly issued T-bills are obtainable through government auctions hosted on the TreasuryDirect platform. These auctions employ a competitive bidding system, attracting a spectrum of participants, including individual investors, hedge funds, banks, and primary dealers.

Successful bidders may subsequently engage in selling these bills to other investors within the secondary market. Competitive bids determine a discounted price relative to the T-bill's par value, enabling bidders to stipulate their desired yield. Non-competitive bids allow investors to propose a bid for a fixed dollar amount of bills, with the yield contingent on the average auction price.

Purchasing T-Bills on the Secondary Market

Alternatively, T-bills are available for purchase through banks or licensed brokers. Upon completion of the transaction, the government issues a confirmation, affirming that the investor is entitled to the invested funds in accordance with the bid's terms.

Distinctions Among Treasury Debt Instruments

Within the spectrum of debt instruments offered by the U.S. Department of the Treasury, Treasury bills, Treasury bonds, and Treasury notes emerge as distinct categories. These various debt products share the commonality of fixed-term obligations.

Diverging primarily in their maturity periods, Treasury bills constitute short-term commitments, maturing within a few days to 52 weeks. Meanwhile, Treasury notes signify medium-term securities, maturing over periods ranging from two to 10 years. Treasury bonds, with the lengthiest lifespan, reach maturity over a 30-year duration.

Evaluation of T-Bills: Pros and Cons

T-Bills stand as a secure investment, boasting minimal default risk. However, this safety net comes with certain trade-offs. While T-bills offer a stable income through a fixed interest rate, they face vulnerability during periods of rising interest rates. In such scenarios, existing T-bills may become less attractive compared to prevailing market rates, exposing bondholders to interest rate risk and potential missed opportunities for higher yields in the future.

Despite their impeccable default risk profile, T-bills typically yield lower returns compared to corporate bonds and select certificates of deposit. Sold at a discounted price relative to the face value, T-bills do not provide periodic interest payments. The ultimate gain materializes upon maturity, representing the variance between the purchase price and face value.

Nevertheless, should an early sale occur, the outcome hinges on prevailing bond prices. In essence, an early sale may result in a gain or loss, with the sale price potentially falling below the initial purchase price.


  • Default Risk: T-Bills carry no default risk due to the U.S. government guarantee.
  • Low Minimum Investment: T-Bills present a minimal entry threshold, requiring only a $100 investment.
  • Tax Benefits: Interest income is exempt from state and local taxes, though subject to federal income taxes.
  • Market Accessibility: T-Bills are easily tradable in the secondary bond market.


  • Low Returns: T-Bills yield lower returns compared to alternative debt instruments.
  • Interest Payment Absence: T-Bills do not provide interest payments before maturation.
  • Cash Flow Impact: T-Bills may impede cash flow for investors seeking consistent income.
  • Interest Rate Risk: In a rising-rate environment, T-Bill rates may lose attractiveness, posing interest rate risk.

Factors Influencing T-Bill Prices

T-Bill prices experience fluctuations akin to other debt securities, influenced by diverse factors such as macroeconomic conditions, monetary policy, and overall Treasury supply and demand.

Maturity Dates

Maturity dates play a pivotal role in determining T-Bill prices. Longer-dated T-Bills tend to yield higher returns during rising interest rate environments, while short-term T-Bills may be discounted less in such scenarios. Conversely, during rate decreases, short-term T-Bills may face higher discounts.

Market Risk

Market risk is intertwined with investors' risk tolerance, impacting T-Bill prices. Economic expansions and reduced perceived risk in alternative investments, such as equities, can lead to lower T-Bill prices. Conversely, during recessions, T-Bills become a preferred safe haven, driving up demand.

The Federal Reserve

The Federal Reserve's monetary policy, reflected in the federal funds rate, significantly influences T-Bill prices. Changes in the rate, driven by the Fed's efforts to manage the money supply, impact short-term rates, including those for T-Bills. Hiking rates prompt T-Bill sales due to their fixed rates being less attractive, while rate reductions draw investors to T-Bills, elevating prices.

The Fed's role as a major purchaser of government debt further affects T-Bill prices. Expansionary monetary policies involving T-Bill purchases elevate prices, whereas selling debt securities diminishes them.

Inflation poses another challenge to T-Bill prices as they compete with rising prices in the economy. In periods of high inflation, T-Bills may lose appeal to investors seeking higher yields. For instance, a T-Bill with a 2% yield during 3% inflation results in an actual loss for the investor, prompting a shift towards more lucrative investments. In summary, the intricate interplay of these factors shapes the dynamic landscape of T-Bill prices in the market.

Treasury Bill Purchase Example

An instance of a Treasury Bill acquisition occurred on May 13, 2023, involving the final issuance of a 52-week T-Bill by the Treasury in April. This particular T-Bill, trading at $95.419667 per $100, was obtainable for $954.19667 when purchasing a $1,000 denomination. Upon maturity, the investor received the full face value of $1,000, resulting in an interest gain of $45.80.


At its core, Treasury Bills, denoted as T-bills, embody brief debt commitments facilitated by the Treasury. Bolstered by the U.S. government, these instruments are synonymous with minimal risk, albeit offering modest returns.

Treasury Bill