Vanguard Cash Plus is not a savings account—it's a money market fund that holds cash and short-term bonds

Vanguard Cash Plus (ticker VMFXX) is a money market mutual fund, not a deposit account. The difference matters because it changes how your money is protected, what rate you earn, and how quickly you can access it. Money market funds invest in very short-term debt—usually maturing in under 90 days—which keeps them stable but also means the rate fluctuates daily based on market conditions. A high-yield savings account, by contrast, is a bank deposit product with a fixed or variable rate set by the bank, FDIC insurance up to $250,000, and no investment risk.

Vanguard Cash Plus does pay interest, and that rate has been competitive with high-yield savings accounts during periods of higher interest rates. But the rate is not may provide. It moves with the broader money market, which means your yield can drop if the Federal Reserve cuts rates or if market conditions change. You won't see the same rate protection you get from a bank deposit account.

Key Takeaways

  • Vanguard Cash Plus is a money market mutual fund that invests in short-term debt, not a bank savings account, so it carries market risk and no FDIC insurance.
  • The interest rate on Cash Plus changes daily and is not may provide, unlike a fixed-rate savings account or money market account at a bank.
  • Your money is not protected by FDIC insurance in a mutual fund, though money market funds are considered very low-risk investments.
  • You can withdraw money from Cash Plus, but it may take one to two business days to settle, whereas a savings account withdrawal is usually instant.
  • If you want may provide FDIC protection and a locked-in rate, a bank high-yield savings account or money market account is a better choice than a mutual fund.

How Vanguard Cash Plus invests your money

Cash Plus holds a portfolio of short-term securities: U.S. Treasury bills, commercial paper (short-term corporate debt), and certificates of deposit. The fund manager buys these instruments because they mature quickly—usually within 60 to 90 days—which keeps the fund's value stable and liquid. The interest you earn comes from the yield on those underlying securities, minus Vanguard's expense ratio (currently around 0.20% annually, though this can change).

Because the fund holds actual investments rather than just holding cash in a bank account, the value of your shares can move slightly, though money market funds are designed to stay very close to $1 per share. If interest rates rise, new securities in the portfolio will pay more, so your yield goes up. If rates fall, your yield falls. You have no control over this—it's determined by market conditions and the fund manager's decisions about which securities to hold.

FDIC insurance and what happens if Vanguard fails

Money market mutual funds are not covered by FDIC insurance. FDIC protection only applies to bank deposits—savings accounts, checking accounts, money market accounts, and CDs held at banks and credit unions. If you hold Vanguard Cash Plus in a Vanguard brokerage account, your shares are protected by SIPC insurance (Securities Investor Protection Corporation) up to $500,000, but only against Vanguard's failure, not against losses in the fund itself.

In practice, money market funds are extremely safe. They are heavily regulated, and a fund collapse is rare. But the protection is different from a bank deposit. If you need absolute certainty that your principal is protected and insured, a bank savings account or money market account is the right choice, even if the rate is slightly lower.

How the interest rate compares to bank savings accounts

During 2023 and early 2024, when the Federal Reserve held interest rates high, Vanguard Cash Plus's yield was competitive with or sometimes higher than many high-yield savings accounts. The fund's 7-day yield (the standard way money market funds report returns) tracked closely with the federal funds rate. However, as the Fed began cutting rates in late 2024, the yield on Cash Plus declined along with it, and the same happened to bank savings accounts.

The real comparison depends on timing. At any given moment, you can check the current yield on Cash Plus against the current APY on a high-yield savings account at your bank. Neither rate is may provide to stay the same. The difference is that a bank may lock in a promotional rate for a set period, whereas Cash Plus's rate changes continuously. Over a long period, the two products may deliver similar returns, but the path to get there is different.

How quickly you can access your money

You can request a withdrawal from Vanguard Cash Plus at any time, but it is not instant. Mutual fund redemptions typically settle in one to two business days, meaning the cash hits your bank account one to two days after you request it. A bank savings account withdrawal is usually available immediately, either through an ATM, debit card, or transfer to another account.

If you need money urgently or want the flexibility of immediate access, a bank savings account is more practical. If you are holding money for a medium-term goal (three months to a year) and don't need to touch it frequently, the slightly higher yield on Cash Plus might be worth the one- to two-day settlement delay.

Tax treatment of money market fund interest

Interest earned in Vanguard Cash Plus is taxable as ordinary income in the year you earn it, just like interest from a savings account. If you hold the fund in a taxable brokerage account, you'll receive a 1099-DIV form at tax time showing the dividends (interest) paid. If you hold it in a tax-advantaged account like an IRA or 401(k), the interest is not taxed until you withdraw from the account.

The tax treatment is the same as a savings account, so this is not a reason to choose one over the other. The real difference is the account type (investment fund versus bank deposit) and the protection that comes with it.

When Cash Plus makes sense versus a savings account

Choose Vanguard Cash Plus if you already have a Vanguard brokerage account and want to park cash there while you decide what to invest in, or if you are comfortable with the small amount of price movement that comes with a mutual fund. It can also make sense if you have more than $250,000 to deposit and want to avoid the FDIC insurance limit—though in that case, you'd be better off spreading money across multiple banks rather than using a mutual fund.

Choose a bank high-yield savings account or money market account if you want FDIC insurance, a may provide rate (even if promotional), and instant access to your money. Most people who are simply looking for a place to earn interest on cash should use a bank product, not a mutual fund. The rate difference is usually small, and the protection and simplicity of a bank account outweigh the potential yield advantage of a money market fund.

Frequently Asked Questions

Can I lose money in Vanguard Cash Plus?

Losing money is extremely unlikely. Money market funds are designed to maintain a stable $1 share price, and Cash Plus invests only in very short-term, low-risk securities. However, it is technically possible for the share price to fall below $1 if interest rates drop sharply or if one of the underlying securities defaults. A bank savings account has no such risk because deposits are FDIC insured.

Is the interest rate on Cash Plus may provide?

No. The rate changes daily based on the yield of the securities in the fund's portfolio and current market conditions. A bank savings account may offer a promotional rate that is may provide for a set period, but Cash Plus's rate is always variable and can drop at any time.

What happens to my money if Vanguard goes out of business?

Your shares are protected by SIPC insurance up to $500,000 against Vanguard's failure. However, this is different from FDIC insurance. If you want absolute protection of your principal, use a bank savings account, which is FDIC insured up to $250,000 per depositor.

Can I use Vanguard Cash Plus as an emergency fund?

It's not ideal. While the money is accessible, redemptions take one to two business days to settle. An emergency fund should be in a bank savings account where you can withdraw instantly. Cash Plus works better for money you know you won't need for at least a few weeks.

Do I pay taxes on Cash Plus interest?

Yes, interest is taxable as ordinary income in the year you earn it, just like savings account interest. If held in a taxable brokerage account, you'll receive a 1099-DIV form at tax time. In a retirement account, taxes are deferred until withdrawal.