This article is for educational purposes only and is not investment advice. All yields are variable and change with Federal Reserve policy; figures reflect data available as of August 2026 and were verified against named primary sources before publication. Verify current rates directly with your broker before acting.
TL;DR — Quick Verdict
- Schwab’s standard bank sweep pays as little as 0.05%–0.45% on uninvested cash, while its own money market fund SWVXX yields roughly 4.97% — a gap that costs about $2,200/year on $50,000 in idle cash.
- Fidelity is the outlier: its default core position (SPAXX) auto-earns a 3.30% 7-day yield, so most Fidelity holders lose little without lifting a finger.
- Vanguard sweeps idle cash into VMFXX at a 3.58% 30-day SEC yield by default — near-parity with its top money funds.
- Head-to-head, Fidelity wins for passive savers; Schwab wins only if you manually buy a money fund. Vanguard sits in between.
- Recommendation: Check your broker’s default sweep rate today. If it’s under 1%, move idle cash into a government money market fund or T-bills — the switch takes minutes and keeps same-day liquidity.
In August 2024, the effective federal funds rate hit 5.33%, yet millions of brokerage customers earned as little as 0.05% on the cash sitting in their accounts. That spread — the difference between what your broker earns lending your cash and what it pays you — became so lucrative that the SEC fined Wells Fargo, Merrill Lynch, and LPL Financial a combined $78 million in early 2025 for sweep programs that regulators said weren’t designed in clients’ best interests. The problem hasn’t vanished with falling rates. Even at 2026 yields, a low-paying default sweep quietly drains hundreds to thousands of dollars a year from ordinary investors.
This report compares the default cash sweep rates at Fidelity, Charles Schwab, and Vanguard, models the real dollar cost of leaving cash in the wrong place, and shows exactly which brokers make you do the work to earn a fair yield. Every rate here comes from the brokers’ own disclosures or filings, cross-checked against Kiplinger and Morningstar data.
What a Cash Sweep Actually Is — and Why the Rate Varies So Much
A cash sweep automatically moves the uninvested cash in your brokerage account — dividends, deposits, proceeds from a sale — into an interest-bearing holding place called your “core position” or “settlement fund.” The catch is that brokers choose the default, and those defaults fall into two very different buckets.
Bank sweeps park your cash in an affiliated bank, where it earns FDIC insurance but often a rock-bottom rate. Money market fund sweeps buy shares of a government money market fund, which typically pays far more but carries SIPC protection instead of FDIC coverage. The gap between the two is where your lost yield lives. Understanding this distinction is the foundation of controlling your total brokerage account cost structure.
Rates vary because each firm sets its own default and its own spread. A broker earning 4% on your swept cash while paying you 0.05% keeps the difference as net interest income. When you compare brokers on more than commissions — as you should in any major brokerage cost comparison — the sweep rate is frequently the single largest hidden cost, dwarfing the $0 trading commissions every major firm now advertises.
2026 Cash Sweep Rates: Fidelity vs Schwab vs Vanguard
The numbers below separate each broker’s automatic default from the higher-yielding fund you can hold instead. Note the semantic distinction held throughout this article: “default sweep rate” means what you get with no action, while “money market fund yield” means what you get after manually selecting a fund.
Sources: Fidelity Trading FAQs (SPAXX 7-day yield, verify at fidelity.com); Vanguard Federal Money Market Fund 30-day SEC yield as of June 30, 2026 (advisors.vanguard.com); Schwab Cash Features Disclosure and Schwab.com cash-investments page (verify at schwab.com). SWVXX yield per WealthVieu analysis of Schwab data.
The headline finding is stark. Fidelity and Vanguard default their customers into money market funds, so the cash you forget about still earns north of 3%. Schwab defaults into a bank sweep paying a fraction of a percent unless you manually buy its Schwab Value Advantage Money Market Fund (SWVXX). This same manual-versus-automatic split shows up when you evaluate low-cost brokerage accounts for beginners, where a forgotten default can quietly undo the savings from commission-free trading.
The Real Dollar Cost: Modeling Lost Yield on Idle Cash
Percentages hide the sting. Dollars don’t. Consider an investor holding $50,000 in uninvested cash — not unusual for someone between trades, holding dry powder, or parking an emergency fund inside a brokerage account.
At Schwab’s low-end default sweep of 0.05%, that $50,000 earns $25 a year. Moved into SWVXX at 4.97%, the same balance earns $2,485. The lost yield is $2,460 annually — for cash that never left the account and stayed just as liquid. Even at Schwab’s higher-cited default of 0.45%, the balance earns $225, still leaving roughly $2,260 on the table.
The math scales linearly, so the calculation is easy to run on your own balance: multiply your idle cash by the yield gap. Here is the full model across common balances, using the 0.05% Schwab default against a 4.97% money fund.
Modeled calculation by Real Cost Report using a 0.05% default sweep rate and a 4.97% money market fund yield (verify current rates at schwab.com). Figures are illustrative single-year estimates; actual yields fluctuate with Fed policy.
These are one-year figures at a single rate. Because money fund yields track the fed funds rate, the gap narrows as the Fed cuts — but it rarely closes, because the default sweep floor tends to stay near zero regardless. Investors who keep meaningful cash while weighing a taxable brokerage versus Roth priority decision should factor this drag into their projections.
Fidelity vs Schwab: Which Is Better for a Cash-Heavy Investor?
For an investor who routinely holds cash — a retiree drawing income, a trader between positions, someone dollar-cost-averaging into the market — the default sweep behavior matters more than any other single feature. Here the two firms diverge sharply.
Fidelity automatically places new accounts’ cash into SPAXX, a government money market fund yielding a 3.30% 7-day yield. The yield is already net of the fund’s 0.42% expense ratio, so no further math is needed. A Fidelity customer who does nothing still earns a competitive rate. Schwab, by contrast, defaults into a bank sweep paying 0.05%–0.45% and requires the customer to manually buy SWVXX to reach roughly 4.97%. Schwab’s fund actually yields more than Fidelity’s once you act — but the operative words are “once you act.”
The behavioral reality is that most people don’t act. Schwab’s model bets on that inertia; the firm earns the spread on every dollar left in the default sweep. Fidelity’s model earns less on idle cash but removes the trap entirely. For anyone comparing these platforms alongside fractional share availability and hidden costs, the sweep default deserves equal weight.
Verdict
For a passive, cash-heavy investor, Fidelity wins decisively — its 3.30% auto-earning default protects you from your own inattention. Schwab is the better choice only for a disciplined investor who will reliably buy SWVXX and capture its higher 4.97% yield. If you know you’ll never log in to move cash, choose Fidelity; if you actively manage every dollar, Schwab’s manual money fund edges ahead on raw yield.
What Most People Get Wrong About Cash Sweeps
Three mistakes account for most of the yield investors leave behind. Each is fixable in minutes.
Mistake 1: Assuming all brokers default to a decent rate. The consequence is a Schwab or E*TRADE customer earning 0.05% while believing their cash is “in a money market.” The correct action is to check your actual core position label in account settings — if it reads “bank sweep” or “cash,” you’re likely in the low-yield default and should buy a money fund manually.
Mistake 2: Double-counting the expense ratio. Investors see SPAXX’s 0.42% expense ratio and subtract it from the quoted 3.30% yield, concluding they earn less. The consequence is bad comparison math. The correct action: a fund’s 7-day SEC yield is already net of fees, so the quoted number is what you actually receive — never subtract the expense ratio again.
Mistake 3: Chasing FDIC insurance you don’t need. Some investors stay in a low-yield bank sweep for FDIC protection on balances well under the $500,000 SIPC securities limit. The consequence is sacrificing 300+ basis points for insurance that a SIPC-covered government money fund effectively duplicates for most retail balances. The correct action is to weigh whether FDIC coverage is worth roughly $2,200 a year per $50,000 — for most, it isn’t. This same insurance-versus-yield tradeoff appears when you assess robo-advisor cash allocation costs, where swept cash can silently reduce your effective return.
Is Moving Your Cash Worth It? Who Should Act
Not every investor needs to touch their sweep. The decision follows simple conditional logic based on how much idle cash you hold and where you hold it.
If you’re a Fidelity or Vanguard customer, you’re already defaulted into a 3.30%–3.58% money fund, so action is optional — you might squeeze out extra yield with a Treasury fund like VUSXX in a high-tax state, but the baseline is fine. If you’re a Schwab, E*TRADE, Merrill, or Morgan Stanley customer, the default is likely near zero, and any balance above a few thousand dollars justifies the two-minute move into a money fund.
The break-even is trivial. Buying a money market fund carries no transaction fee at any major broker and preserves same-day liquidity for trades. On $10,000 the switch recovers roughly $492 a year; on $100,000 it recovers nearly $4,920. The only investors who can rationally skip it are those holding minimal cash or those who genuinely need FDIC insurance on very large balances. If you’re also reviewing your advisor relationship, the sweep question pairs naturally with a look at fee-only versus AUM advisor costs and whether your advisor flagged this drag at all — a fiduciary should have. You can confirm that duty using the fiduciary versus non-fiduciary distinction and verify any advisor’s record through BrokerCheck credential verification.
Frequently Asked Questions
Is my swept cash safe if it’s not FDIC insured?
Cash in a government money market fund like SPAXX or VMFXX is covered by SIPC, which protects up to $500,000 in securities (including a $250,000 cash sub-limit) against brokerage failure. SIPC does not cover market losses, but government money funds hold short-term U.S. government debt and maintain a stable $1.00 share price, making them very low risk. FDIC insurance applies only to bank sweeps, not money funds.
Why did Schwab, Wells Fargo, and Morgan Stanley get sued over cash sweeps?
Investors and the SEC alleged these firms funneled idle cash into low-yielding affiliated bank sweeps to capture the spread, without acting in clients’ best interests. In January 2025, Wells Fargo subsidiaries paid $35 million, Merrill Lynch $25 million, and LPL Financial $18 million to settle SEC charges. Multiple class-action lawsuits over the same practice remain active, with one filing alleging Ameriprise earned over $2.5 billion from its sweep program in a single year.
Does moving cash into a money market fund reduce my liquidity?
Barely. At Fidelity and Vanguard the money fund is your settlement position, so it liquidates automatically to fund trades or withdrawals. At Schwab, selling SWVXX settles the next business day if you sell by 4 p.m. Eastern, so cash is available for same-day trading with one extra step. For most investors the minor timing difference is far outweighed by the roughly 4.9-point yield improvement.
How We Researched This Article
Every rate in this report was drawn from a primary or named institutional source and verified before publication. Default sweep and money market fund yields for Fidelity came from Fidelity’s Trading FAQs and Cash Management Account disclosures at fidelity.com. Schwab’s default bank sweep behavior and its Intelligent Portfolios Sweep rate came from Schwab’s official Cash Features Disclosure Statement and sweep rate pages at schwab.com. Vanguard’s VMFXX 30-day SEC yield and expense ratio came from the fund’s official page at vanguard.com and were cross-checked against Morningstar and Kiplinger.
Regulatory and litigation figures — the January 2025 SEC settlements and pending class actions — were sourced from Bloomberg Law, Banking Dive, and Financial Planning coverage of the SEC actions. The federal funds effective rate used for context reflects the August 2024 peak of 5.33% as reported in regulatory filings cited by Bloomberg Law.
The lost-yield tables are modeled calculations, not measured returns. They multiply stated balances by the spread between a 0.05% default sweep and a 4.97% money market fund yield to produce single-year illustrations; they assume static rates and do not compound or account for taxes. Because money fund yields move daily with Fed policy, readers should treat all yield figures as point-in-time snapshots and verify current rates with their broker. Schwab’s default sweep is reported as a 0.05%–0.45% range because published sources disagreed on the exact current figure; where sources conflicted, we reported the range rather than a single point. This research was last conducted in August 2026. All figures were verified against named primary sources before publication.