"Sweep in" means cash moved into your settlement fund. "Sweep out" means cash left it. At Vanguard the settlement fund is VMFXX, the Vanguard Federal Money Market Fund. A sweep-in line appears when you deposit money, sell something, or receive a dividend. A sweep-out line appears when you buy something or withdraw. Neither one is a trade you need to act on.
The lines look alarming because they show up in your transaction history looking like purchases and sales of a fund you never chose. They are bookkeeping. Vanguard does not let cash sit idle in a brokerage account, so every dollar that is not invested is automatically parked in a money market fund, and every movement of that cash gets a line.
What each label means
| You see | What happened | Typical trigger |
|---|---|---|
| Sweep in | Cash was moved into VMFXX | A bank transfer arrived, you sold shares, or a dividend was paid |
| Sweep out | Cash was taken out of VMFXX | You bought an ETF or fund, or withdrew to your bank |
| Dividend (VMFXX) | The settlement fund paid its monthly interest | End of each month |
So a day where you buy $2,000 of VTI shows two lines: the VTI purchase, and a $2,000 sweep out of VMFXX to pay for it. One decision, two entries.
Why it is VMFXX and not a bank account
VMFXX is the default settlement fund for Vanguard Brokerage accounts. It is a government money market fund: it holds short-term US government securities and repurchase agreements, aims to hold a steady $1.00 share price, and pays out interest monthly. It charges a 0.11% expense ratio.
A money market fund is an investment, not a bank account, and it is not FDIC insured. Your account at the brokerage is covered by SIPC up to $500,000 if the firm itself fails, which is a different protection from deposit insurance and does not cover a fund losing value.
What the default is earning, and what it leaves on the table
For a default, VMFXX is a good one. Many brokers sweep idle cash into a bank program paying close to nothing. Vanguard's default pays a money market yield at a low fee, so cash you forget about is still earning.
The gap that matters is state tax. VMFXX holds a mix of Treasuries, agency debt, and repurchase agreements, and only part of its income counts as US government obligations that states exempt. A Treasury-only holding passes through far more of that exemption. In a high-tax state the difference in what you keep can be larger than the difference in yield. We run that comparison in SGOV vs VMFXX.
Every cash option on one page
The Cash Parking Cheat Sheet: SGOV, T-bills, money market funds, and savings accounts compared on fee, access, and state-tax treatment. One printable page.
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Other places Vanguard cash can sit
- VUSXX, the Vanguard Treasury Money Market Fund. More Treasury-heavy than VMFXX, 0.09% fee, $3,000 minimum, and you have to buy it on purpose. See SGOV vs VUSXX.
- SGOV, a Treasury bill ETF. 0.09% fee, no minimum, holds essentially only T-bills. Unlike the sweep, it is a trade: you buy and sell it yourself. See the SGOV guide.
- Leaving it in VMFXX. For small balances or cash you will spend soon, the convenience of the automatic sweep is the whole point.
A sweep line is the account working as designed. The only decision hiding in it is whether the cash you leave parked for months belongs in the default or in something more Treasury-heavy. For a few hundred dollars waiting on your next purchase, it does not matter. For a five-figure emergency fund in California or New York, it is worth ten minutes.
VMFXX sweep in and sweep out
- Sweep in: cash moved into VMFXX, your Vanguard settlement fund. Sweep out: cash left it to fund a purchase or withdrawal.
- They are automatic bookkeeping entries, not trades you placed or need to respond to.
- VMFXX is a government money market fund with a 0.11% fee that pays interest monthly.
- It is not FDIC insured. SIPC covers the brokerage account, which is a different protection.
- For larger balances in high-tax states, a Treasury-only option keeps more after state tax.
Common questions
Sweep in means cash was automatically moved into the Vanguard Federal Money Market Fund, VMFXX, which is the settlement fund for Vanguard Brokerage accounts. It happens when money arrives in the account, for example from a bank transfer, a sale, or a dividend. It is a bookkeeping entry, not a trade you need to act on.
Sweep out means cash was taken from your settlement fund to pay for something, usually a purchase of an ETF or mutual fund, or a withdrawal to your bank. A single purchase typically shows two lines: the purchase itself and the matching sweep out of VMFXX.
No. VMFXX is a money market mutual fund, which is an investment rather than a bank deposit, so FDIC insurance does not apply. Brokerage accounts are covered by SIPC up to $500,000 if the brokerage firm fails, but SIPC does not protect against a fund losing value.
VMFXX is a low-cost default that pays a money market yield, which makes it a reasonable place for cash waiting to be invested or spent soon. Investors holding larger balances for longer, especially in high-tax states, often compare it with Treasury-only options because more of that income is exempt from state tax. This is educational information, not advice.