4 Mistakes Treasurers Need to Avoid When Investing in a Money Market Fund

Feb 14, 2025

What Are Money Market Funds?

Money Market Funds (MMFs) are a type of mutual fund that invests in short-term, relatively liquid financial instruments. The primary goal of MMFs is to offer investors a stable and safe place to maintain cash while simultaneously earning a modest return. However, investors can still make common mistakes when deciding to invest in MMFs. Here are some common mistakes to avoid when investing in Money Market Funds. 

Common Mistakes to Avoid When Investing in MMFs

Assuming All Money Market Funds Are the Same

Money Market Funds come in various types, each with different risk profiles and investment strategies.  Funds can vary between municipal securities, government-only (T-bills and repurchase agreements), and corporate debt or non-government-backed securities. With such diversity, investors must recognize that not all Money Market Funds carry the same risks. As an investor, it is important to understand the risks associated with each fund before investing. Here are the three main types of Money Market Funds. 

Government Money Market Funds:

These fund types primarily invest in short-term government securities, such as U.S. Treasury bills, repurchase agreements (repos) backed by government securities, and other government-related instruments. Although the fund itself is not backed by the government, the underlying securities are typically viewed as safe and low-risk. Hence, the Government MMF is generally viewed as the safest and most reliable type of money market fund. Government MMFs offer minimal risk but in exchange, they typically offer lower yields compared to other types of MMFs.

Municipal Money Market Funds

These fund types invest primarily in short-term debt issued by state and local governments (such as municipal bonds or notes). Municipal MMFs are attractive to investors who seek tax advantages. This is because the interest income earned from Municipal MMFs is often exempt from federal income taxes and if applicable to the investor’s residing location, sometimes even exempt from state and local taxes. In exchange for these tax advantages, Municipal MMFs typically may yield slightly lower returns compared to other types of money market funds because of the tax exemptions.

Prime Money Market Funds

These fund types invest in a more expansive range of short-term, low-risk debt instruments. Securities in this fund type include commercial paper (corporate issued), certificates of deposit, and repurchase agreements. Prime MMFs are typically considered low-risk, but the risk is slightly higher than that of government or municipal funds due to their exposure to the creditworthiness of financial institutions and corporations. However, in times of market stress or economic uncertainty, these funds may experience more volatility, as the credit risk of corporate issuers may rise. Prime MMFs are a good choice for investors who are seeking to maximize short-term returns while still maintaining a relatively safe investment and are comfortable with a bit more risk.

Not Reviewing the Prospectus and the Fund’s Underlying Assets

A fund’s prospectus provides crucial details regarding the fund’s investment objectives, strategies, fees, risks, and underlying assets. It is required to be provided to all investors before an investment is made. It’s important for investors to review the fund prospectus as it provides the information needed in order to ensure that the fund meets the investor’s goals and aligns with the investor’s risk tolerance. Reviewing the fund’s underlying assets is vital to understanding the fund’s risk profile. Some key areas of focus in reviewing a fund’s underlying assets include:

Credit Quality of Assets

Credit quality is an estimate of the issuer’s ability to pay back its debt obligations. It is typically determined by credit ratings which are provided by independent agencies such as Moody’s, Standard & Poor’s (S&P), and Fitch. Ratings help to evaluate the risk associated with investing in a particular security. Higher credit quality typically means lower risk. In contrast, a lower credit quality generally introduces higher risk.

Asset Allocation

We previously discussed the types of Money Market funds available, whether they are government-only, Municipal MMF, or Prime MMFs. Each provides a different range of securities for different investor needs. With each fund, it is important to review the underlying assets that make up the fund. To reiterate, here are a few types of securities that may be offered in a money market fund:

• Banker’s Acceptance: Short-term debt instruments that are guaranteed by a bank

• Certificates of Deposits: Short-term deposits issued by banks

• Commercial Paper: Short-term debt issued by corporations

• Municipal Debt: Short-term debt issued by Municipalities

• Repurchase Agreements: Short-term loans collateralized by securities

• U.S. Treasury Bills: Short-term debt instruments issued by the U.S. government

It is important to understand the securities that make up the fund and to be comfortable with the risk that may be associated with it.

Fund Performance

Investors can also review how the underlying assets have been performing. The fund’s prospectus typically provides a snapshot of the fund’s historical performance over a set period of time. Investors can review yields to see if the fund is performing in line and generating competitive returns. However, with any investment, it is important to remember that past performance is not indicative of future returns.

Ignoring Expense Ratios

Expense ratios of Money Market Funds are generally low in comparison to other Mutual funds; This is due to their conservative investment strategies and priority in short-term and low-risk investments. With the relatively low-cost reputation that Money Market Funds have, investors can easily make the mistake of not paying attention to the fund’s expense ratio. Funds with higher expense ratios can quickly and easily cut into returns over time, especially if the yield is already low to begin with. Investors can diminish this risk by researching and choosing funds with a lower expense ratio. This will assist in ensuring their return is not greatly impacted by higher fees. Here are the general ranges of expense ratios for each type of MMF.

Government Money Market Funds tend to have the lowest expense ratios in comparison to the other types of MMFs. Government MMFs do not require active management as they primarily invest in low-risk, liquid government securities.  It’s important to note that government money market funds may invest in repurchase agreements,  which are typically not exempt from state tax and not obligations of the US government, so it’s important to check the detailed holdings of the individual fund.

Prime Money Market Funds typically have the highest expense ratio when compared to Government and Municipal MMFs. As its investment strategy offers a broader range of securities, investors should expect their funds to require more analysis and management. Prime MMFs typically have slightly higher expense ratios.

Municipal Money Market Funds generally have relatively low expense ratios since their focus is on short-term municipal securities. These types of funds are relatively simple to manage but do come with the added complexity of tax considerations.  Municipal money funds typically have substantially lower expected returns but are often exempt from tax, so may only be appropriate for entities in a high tax bracket.

While the expense ratios of all of these funds are relatively low, investors should pay attention before investing to maximize their overall return.

Focusing Solely on Liquidity

Liquidity is one of the main advantages of money market funds. Investors expect to easily buy and sell shares without much delay and without significant price fluctuations. This is expected as Money Market funds aim to provide a stable Net Asset Value (NAV) of $1 per share. That means investors generally expect to redeem shares at $1 per share. Although the fund’s aim is to maintain the $1 NAV, it is not a guarantee, and the NAV can fall below $1.

This instance is referred to as “Breaking the Buck”. Breaking the buck can happen when an MMF’s investment income fails to cover losses on its investment and/or its operating expenses. This is more likely to occur when interest rates fall to extremely low levels or if a fund uses leverage, which creates capital risk.

Historically, breaking the buck has happened during times of financial crisis and market stress. For example, during the 2008 financial crisis, the Reserve Primary Fund’s NAV fell under $1 per share when the Lehman Brothers filed for bankruptcy. The Reserve Primary Fund had held only 1.5% of its securities in Lehman Commercial paper, but when the bankruptcy filing occurred, those loans became worthless, thus causing the funds’ overall NAV to fall below $1. Investors in the Fund were concerned about the remaining holdings in the fund and quickly began pulling out money, which caused the fund’s assets to decline drastically in just 24 hours.

2008 Lehman bankrupvy effect on Prime MMF outflows (Source: WesternAsset)

Additionally, it is important to note that some funds may have fees on withdrawals, especially during times of market stress (especially if the fund holds illiquid assets). 

Redemption fees may be imposed if investors withdraw funds from the money market fund within a short period after investing. Some funds charge this fee to discourage short-term trading and investors who may take advantage of the fund’s liquidity. Redemption fees are more prevalent in actively managed funds. Fees can also be imposed in times when the fund is facing stress due to frequent redemptions and/or larger incoming flow. 

Redemption fees are typically not common in most standard, low-fee, and stable government money market funds. It is important for investors to examine the fund’s liquidity policy so they can confirm that the fund aligns with their needs.

Conclusion

Money Market funds can be a great investment option for investors seeking lower-risk, short-term investments.  It is important for investors to educate themselves and to ensure that the fund they are investing in, is a good overall fit for their needs. Carefully reviewing a fund’s prospectus and gathering as much information on the fund will help investors determine if the fund meets their demands. Although rare,  it is possible to lose money with a money market fund and investors need to be comfortable with any risks associated.