A Vanguard Cash Plus account is a money market fund that holds your cash and pays interest while you wait to invest it elsewhere

Vanguard Cash Plus is not a bank account—it is a money market mutual fund that Vanguard offers as a place to park cash. When you deposit money into it, Vanguard invests that cash in short-term debt securities like Treasury bills and commercial paper. In return, you earn interest, which Vanguard pays out daily. The fund is designed to be stable: the share price stays at $1, so you will not see your balance go up or down based on market swings the way you would with a stock fund.

Most people use Cash Plus as a holding tank. You might deposit a lump sum you are not ready to invest yet, or keep money there while you decide where to put it. Some investors use it as an emergency reserve within their Vanguard account. Because it is a mutual fund, not a bank deposit, it is not covered by FDIC insurance—but Vanguard's Cash Plus invests only in very low-risk securities, so the risk of losing money is extremely small.

Key Takeaways

  • Cash Plus is a money market fund, not a bank account, so your deposits are not FDIC-insured but are invested in very short-term, low-risk debt.
  • You earn interest daily on your balance, and the fund's share price stays at $1 per share, making it predictable and stable.
  • You can move money out of Cash Plus into other investments within your Vanguard account without waiting for a bank transfer.
  • The interest rate Cash Plus pays changes with market conditions and is typically lower than high-yield savings accounts at banks.
  • Cash Plus works best as a temporary holding place for money you plan to invest soon, not as a long-term savings account.

How interest is calculated and paid

Vanguard calculates interest on your Cash Plus balance every day and adds it to your account. The rate you earn depends on what the Federal Reserve's interest rates are doing and what short-term debt securities are paying at any given time. When the Fed raises rates, Cash Plus yields typically rise a few weeks later. When the Fed cuts rates, yields fall.

You do not have to do anything to receive the interest—it accrues automatically. Unlike a bank savings account where interest might be credited monthly or quarterly, Cash Plus credits interest daily, which means you start earning interest on your interest right away. The exact yield changes constantly, so Vanguard publishes a current rate on their website that you can check anytime.

Cash Plus versus a bank savings account

The main difference is insurance and access. A bank savings account is FDIC-insured up to $250,000, which means if the bank fails, your money is protected. Cash Plus is not insured that way because it is a mutual fund, not a bank product. However, the risk is very low because Vanguard invests only in Treasury bills and other extremely safe short-term debt.

Bank savings accounts, especially high-yield savings accounts, sometimes pay more interest than Cash Plus—particularly when banks are competing for deposits. But Cash Plus has one advantage: if you hold it inside a Vanguard brokerage account, you can move money into stocks or bonds instantly without waiting for a bank transfer to clear. That speed matters if you see an investment opportunity and want to act quickly.

Moving money in and out of Cash Plus

If you have a Vanguard brokerage account, you can deposit money into Cash Plus by transferring it from your bank. The transfer typically takes one to three business days to arrive. Once the money is in Cash Plus, you can move it to other investments within Vanguard—stocks, bonds, mutual funds—instantly, without waiting for another bank transfer.

To withdraw money from Cash Plus back to your bank account, you request a transfer through Vanguard's website or app. That transfer also takes one to three business days. There are no withdrawal limits or penalties for moving money in and out of Cash Plus, so you can treat it as a flexible holding area.

Tax treatment of Cash Plus interest

Interest earned in Cash Plus is taxable income. If you hold the account in a regular taxable brokerage account, Vanguard will send you a 1099-DIV form at the end of the year reporting the interest you earned, and you will owe federal income tax on it. The tax rate depends on your overall income and tax bracket.

If you hold Cash Plus inside a tax-advantaged account like a traditional IRA or Roth IRA, the interest is not taxed that year. In a Roth IRA, the interest is never taxed. In a traditional IRA, you pay tax when you withdraw the money in retirement. This is one reason some investors use Cash Plus inside retirement accounts as a safe place to hold money temporarily.

When Cash Plus makes sense and when it does not

Cash Plus works well if you are saving for an investment you plan to make within weeks or months, or if you want a stable place to hold emergency money inside your Vanguard account. It also makes sense if you are waiting for a large deposit to clear and want to earn something on it in the meantime.

Cash Plus is not the right choice if you need your money to be FDIC-insured, if you want the highest possible interest rate, or if you plan to leave the money untouched for years. For long-term savings, a high-yield savings account at a bank might pay more and offer insurance. For long-term investing, stocks or bonds inside Vanguard will likely grow faster over time.

Frequently Asked Questions

Can I lose money in Cash Plus?

The risk is extremely low because Vanguard invests only in Treasury bills and other very short-term, safe debt. The share price stays at $1, so you will not see your balance decline due to market movements. However, Cash Plus is not FDIC-insured, so in a theoretical worst-case scenario involving Vanguard itself, there is a small risk—though Vanguard is a large, stable company.

Does Cash Plus have a minimum balance?

Vanguard does not publish a minimum balance requirement for Cash Plus itself, but you may need to meet a minimum to open a brokerage account in the first place. Check Vanguard's current account requirements on their website, as these can change.

How does Cash Plus compare to a money market account at a bank?

A bank money market account is FDIC-insured and sometimes pays higher interest, but it is a bank product. Cash Plus is a mutual fund that offers instant transfers within Vanguard but no FDIC insurance. If you want insurance and do not need instant access to investments, a bank money market account may be better. If you want speed and are comfortable with mutual fund structure, Cash Plus works.

Can I use Cash Plus as an emergency fund?

You can, but only if you are comfortable with it not being FDIC-insured. The money is accessible within one to three business days when you transfer it to your bank. For a true emergency fund, many people prefer a bank savings account because of FDIC insurance, even if the interest rate is lower.

What happens to my Cash Plus interest if interest rates fall?

Your yield will drop. Cash Plus interest rates follow short-term market rates, which move with Federal Reserve policy. When rates fall, the interest you earn on new deposits and existing balances will be lower. This is why Cash Plus is not ideal for long-term savings—you are exposed to falling rates over time.