Treasury Bills (T-bills)

What is Treasury Bills (T-bills)?

Treasury Bills, commonly referred to as T-bills, are short-term debt instruments issued by the U.S. Department of the Treasury. They are sold at a discount to their face value and pay the full face value at maturity, with the difference representing the interest earned by the investor. T-bills are considered among the safest investments in the world due to the backing of the U.S. government.

The U.S. Treasury issues T-bills in various maturities, typically 4-week, 8-week, 13-week, 17-week, 26-week, and 52-week terms. These securities are crucial for financing the national debt and managing the government’s cash flow. Their short maturity makes them attractive to investors seeking liquidity and minimal risk.

For investors, T-bills offer a predictable return with virtually no default risk. They are a popular choice for individuals and institutions looking to preserve capital while earning a modest return, especially during periods of economic uncertainty. The secondary market for T-bills is also highly liquid, allowing investors to sell them before maturity if needed.

Key Takeaways

• T-bills are short-term debt securities issued by the U.S. Treasury, with maturities of one year or less.
• They are sold at a discount and pay the face value at maturity, with the difference being the interest earned.
• T-bills are considered very low-risk investments due to government backing.
• They offer liquidity and capital preservation, making them suitable for short-term investment goals.

Understanding Treasury Bills (T-bills)

Treasury Bills represent a fundamental tool for government financing and a cornerstone of the short-term debt market. Unlike coupon-paying bonds, T-bills do not pay periodic interest. Instead, their yield is derived from the difference between the purchase price (which is less than par value) and the face value received upon maturity.

The auction process is how T-bills are typically sold to the public. Bids can be competitive or non-competitive. Non-competitive bids are accepted at the average discount rate determined by competitive bidding, ensuring that all non-competitive bidders receive securities at the same price. Competitive bids specify the discount rate at which the bidder is willing to buy.

The yields on T-bills are closely watched as indicators of short-term interest rate expectations and overall economic health. They serve as a benchmark for other short-term borrowing costs in the economy. Their high liquidity and safety make them a primary component of many investment portfolios, particularly for those prioritizing capital preservation.

Formula

The discount yield of a Treasury Bill can be calculated using the following formula:

Discount Yield = ((Face Value – Purchase Price) / Face Value) * (360 / Days to Maturity) * 100%

Alternatively, the investment yield (also known as the money market yield or bond equivalent yield) provides a more direct comparison to other interest-bearing investments. The approximate bond equivalent yield is calculated as:

Bond Equivalent Yield = ((Face Value – Purchase Price) / Purchase Price) * (365 / Days to Maturity) * 100%

Real-World Example

Suppose an investor purchases a 13-week (91-day) Treasury Bill with a face value of $1,000 for $995. The purchase price is $995, the face value is $1,000, and there are 91 days until maturity.

Using the discount yield formula: Discount Yield = (($1,000 – $995) / $1,000) * (360 / 91) * 100% = 0.5% * 3.956 * 100% ≈ 1.978%.

Using the approximate bond equivalent yield formula: Bond Equivalent Yield = (($1,000 – $995) / $995) * (365 / 91) * 100% = 0.5025% * 4.011 * 100% ≈ 2.015%.

Importance in Business or Economics

Treasury Bills play a vital role in both fiscal and monetary policy. For the U.S. Treasury, they are a primary means of raising funds to meet short-term obligations and finance government operations without significantly impacting long-term debt levels. They provide a consistent and reliable source of funding.

From a monetary policy perspective, the Federal Reserve actively buys and sells T-bills in the open market to influence the money supply and interest rates. These