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Money Market Yield


Money Market Yield (MMY) is a formula used to calculate the annualized yield of a money market instrument, such as Treasury bills or other short-term investments, based on its discount rate and the number of days to maturity. It represents the return rate an investor would receive if the short-term instruments were held for a full year. The MMY is a critical tool that helps investors to compare different money market securities.


The phonetic pronunciation of “Money Market Yield” is: Money: /ˈmʌni/ Market: /ˈmɑːrkit/Yield: /jiːld/

Key Takeaways

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  1. Liquidity and Safety: Money Market Yield investments are considered low risk and highly liquid. They allow investors to readily access their funds without incurring significant losses or penalties for early withdrawal.
  2. Variable Returns: The returns on Money Market Yield are variable and depend on the fluctuations in short-term interest rates. Despite the fact that they are lower than other investment types, they can provide a stable income stream.
  3. Inflation Risk: A main drawback of Money Market Yield is that they may not outpace inflation, possibly eroding the purchasing power of the investor’s savings over time.

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Money Market Yield (MMY) is a significant financial term as it provides an indication of the annualized rate of return for money market instruments like Treasury bills or other short-term securities. It allows investors to compare the returns of these instruments that are usually sold on a discount basis with less than one year to maturity. Since these investments are highly liquid and considered relatively low-risk, investors use MMY to identify which investments will offer them the most value for their short-term financial needs. Furthermore, it helps in making informed decisions about where to allocate capital for the most advantageous return, contributing to effective financial management and strategy planning.


The purpose of the Money Market Yield (MMY), also known as the annual percentage yield, is to reflect the annualized rate of return for money market instruments based on a 360-day year. These instruments, such as Treasury bills or commercial paper, are short-term, high-quality, liquid debt instruments issued by governments, financial institutions and corporations. By calculating the MMY, an investor or financial manager can compare the profitability of these instruments and make informed decisions about where to park their cash to receive the highest yield.MMY is used for performance evaluation and comparison. When large institutions, corporations or investors have spare cash they want to park in a safe place for a short period, they usually consider money market instruments due to their high liquidity and short maturity period. It is in this context that the MMY becomes important because it allows for the comparison of different instruments that have different discount rates and maturities. In addition, the use of MMY is common for bond investors, as it allows them to easily compare the yields of money market securities with the yields of the bonds in which they invest.


Money Market Yield (MMY), also known as the annualized yield, is a formula used to calculate the annualized yield of a money market instrument based on its discount rate and the number of days to maturity. These are typically short-term debt instruments, usually with a maturity date of less than one year. Here are three real-world examples:1. Treasury Bills: The U.S Treasury Department issues treasury bills, which are short-term securities with maturities of one year or less. They are sold at a discount and the investor receives the face value at maturity. The Money Market Yield is utilized to calculate the annualized yield of these treasury bills.2. Commercial Paper: Large corporations often issue commercial paper, which is unsecured short-term debt, to fund short-term liabilities such as inventory purchases. The yield on the commercial paper when determined through the MMY gives the investor an idea of the return they would get in a year.3. Certificates of Deposit: Banks and credit unions offer Money Market deposit accounts and Certificates of Deposit (CDs), these are short-term time deposits with specified maturity dates. The Money Market Yield can be used to calculate the annual yield, which helps depositors understand the return they would get on their investment.

Frequently Asked Questions(FAQ)

What is Money Market Yield (MMY)?

Money Market Yield is a formula used to calculate the annualized yield of a money market instrument, such as a treasury bill or commercial paper, based on its discount rate and the number of days to maturity.

How do you calculate Money Market Yield?

MMY is calculated using the formula: MMY = (Discount Yield * 360) / (360 – (Discount Yield * Days to Maturity))

What does MMY indicate?

The Money Market Yield indicates the return an investor would earn if a short-term interest-bearing security like treasury bill or commercial paper is held for one year or less up to its maturity.

How is MMY different from the Bond Equivalent Yield (BEY)?

While both MMY and BEY are used to calculate the annualized yield of a money market instrument, they operate on different compounding periods. MMY operates on simple interest, whereas BEY operates on semi-annual compounding.

Is a higher MMY always better?

Not necessarily. A higher MMY does mean a higher return, but it also might indicate a higher level of risk. It’s important to balance potential returns with risk tolerance.

Is MMY only used for treasury bills?

No. MMY can be used to calculate the yield of any money market instrument, such as treasury bills, commercial paper, bankers’ acceptances, and certificates of deposit.

How does the number of days to maturity affect MMY?

The number of days to maturity is inversely related to the MMY. The fewer days to maturity, the higher the MMY.

How often is MMY calculated?

Typically, MMY is calculated at the time of purchase and holds until the instrument’s maturity date. However, the calculation can be updated if the holder plans to sell the instrument before maturity.

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