What Is a Treasury Index?

What Is a Treasury Index?

3 Min.

The Treasury index is a commonly used benchmark for determining interest rates, like mortgage rates. It is based on recent auctions of U.S. Treasury bills, which means that it is derived from the yields of 5- and 10-year Treasury notes and futures contracts. There are several types of treasury indices that influence other securities. U.S. Treasury index rates are an important indicator of how much risk investors are willing to take on.


Various financial entities like Vanguard, Fidelity, and Northern Trust meticulously compile and disseminate Treasury indices. They, underpinning Treasury mutual funds offered by these firms, find substantial application in shaping interest rates, including mortgage rates. The benchmarks stem from recent U.S. Treasury bill auctions, making them pivotal in the financial world.

Exploring Treasury Index Metrics

Treasury indexes, rooted in recent U.S. Treasury bill auctions or the Treasury's daily yield curve, encompass various facets. Among them, the most prevalent index draws its essence from 5- and 10-year Treasury notes and futures contracts.

These Treasury index rates serve as influential forces on diverse securities, portraying investors' risk tolerance. Comprising weighted averages of five-year, 10-year, and bond-futures contracts, each component accommodates distinct investment horizons, harmonizing their contribution to the index.

Lenders often rely on a Treasury index to determine interest rates for variable-rate mortgages. It also serves as a yardstick for assessing capital market investment performance, signifying a readily attainable rate of return. It's worth noting that the calculation methodologies for Treasury indexes and their components can vary between financial institutions.

Understanding the Spectrum of U.S. Treasury Debt Instruments

U.S. Treasury debt instruments exhibit diverse maturities, ranging up to 30 years. Treasury bills (T-bills) are short-term with maturities under a year, while Treasury notes (T-notes) mature in 10 years or less. The lengthiest options are Treasury bonds (T-bonds), featuring 20 and 30-year maturities. These government instruments, like other bonds, maintain an inverse relationship between price and yield. As prices rise, yields decline.

The foundation of a Treasury index lies in the U.S. Treasury's daily yield curve, reflecting returns on government debt. This yield curve dictates government borrowing rates and influences returns for securities purchasers. Treasury indices also drive interest rates on loans from financial institutions.

The Treasury yield curve serves as a barometer for economic sentiment. Elevated long-term Treasury yields signal positive economic prospects, coinciding with rising interest rates due to the government's increased yield demands to attract investors.


Treasury indices are crucial for shaping interest rates, including mortgages, based on recent U.S. Treasury bill auctions and yields of 5- and 10-year Treasury notes. These indices influence various securities and reflect investor risk tolerance.

U.S. Treasury debt spans short-term Treasury bills to long-term Treasury bonds, with an inverse price-yield relationship. These instruments are linked to the U.S. Treasury's daily yield curve, which serves as an economic barometer. Higher long-term Treasury yields signify a positive economic outlook, often leading to rising interest rates. Treasury indices and the debt instrument spectrum provide essential insights into the financial markets and the economy.

Treasury Index
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