What happens to uninvested cash in a brokerage account?

By default, uninvested cash in a brokerage account is swept into a 'core position' — typically a low-yield bank sweep account or money market fund. The rate varies significantly by broker: Fidelity sweeps cash into money market funds earning 4.85–5.0% APY; Vanguard's default settlement fund earns approximately 4.5–5.0% APY; Schwab's default bank sweep pays only 0.01–0.45% APY. If you have significant cash sitting idle in Schwab or another low-sweep broker, you're leaving substantial returns on the table.

What are the best options for cash in a brokerage account?

Best options for uninvested brokerage cash: 1) Money market mutual fund — e.g., Fidelity Government Money Market (SPAXX) at ~4.85% APY, Vanguard Federal Money Market (VMFXX) at ~4.5%; 2) Treasury bills — purchase 3-month or 6-month T-bills directly in your brokerage; state tax exempt; 3) Short-term CD or bond ETF — for slightly more yield with minimal risk; 4) Move cash to a HYSA — transfer excess brokerage cash to an external high-yield account. Option 1 (money market fund) is easiest since it's within your brokerage.

What is a brokerage sweep account?

A sweep account automatically moves uninvested brokerage cash into an interest-bearing vehicle — typically a bank sweep program or money market fund — at the end of each trading day. This ensures your idle cash earns some return while remaining available for investment. The term 'sweep' refers to cash being 'swept' from your main brokerage account into the receiving vehicle. The rate on sweep accounts varies dramatically: Fidelity's money market sweep pays ~4.85%; Schwab's bank sweep pays as little as 0.01–0.45%.

Is money in a brokerage cash account FDIC insured?

It depends on the sweep vehicle: If swept into a bank deposit (Schwab, Merrill Edge), FDIC insured up to $250,000; FDIC sweep networks can provide $1–2.5M through multiple banks. If swept into a money market mutual fund (Fidelity, Vanguard), covered by SIPC (up to $500,000 including $250,000 cash) — not FDIC. Money market funds invest in short-term government securities and are extremely low risk, but unlike FDIC deposits, they are not guaranteed.

Should I keep an emergency fund in my brokerage account?

No — an emergency fund should not be in a brokerage account. The problem: selling investments in an emergency may force you to sell at a loss if the market is down. Brokerage transfers to your bank account take 1–2 business days. Emergency funds should be in a high-yield savings account: instantly accessible, FDIC insured, no market risk, currently earning 4.35–4.75% APY — competitive with brokerage money market funds without any investment risk.

What to Do With Cash Sitting in Your Brokerage Account 2026

What to Do With Cash Sitting in Your Brokerage Account

Uninvested brokerage cash earns nothing — or near nothing — in default sweep accounts at some brokers. Here is how to maximize the return on cash you’re holding between investments.

Default Sweep Rates by Major Broker (May 2026)

Broker	Default Cash Rate
Fidelity	~4.85% APY (money market fund, SPAXX default)
Vanguard	~4.5% APY (Federal Money Market Fund, VMFXX)
Schwab	0.01–0.45% APY (bank sweep — very low)
TD Ameritrade (now Schwab)	Similar to Schwab
Interactive Brokers	~4.5–4.8% APY (IBKR varies by cash tier)
Merrill Edge	~0.01% APY (bank sweep)
Robinhood	~4.9% APY (brokerage cash sweep, Gold required for highest rate)

Key finding: Schwab and Merrill Edge pay near-zero on default brokerage cash sweeps while Fidelity automatically earns ~4.85% on uninvested cash. This is a significant difference if you keep substantial cash in your brokerage.

4 Ways to Put Brokerage Cash to Work

Option 1: Switch to a Money Market Mutual Fund (Easiest)

Within your brokerage, manually set your “core position” (settlement fund) to a money market mutual fund:

Fidelity: SPAXX (Government Money Market) — default, ~4.85% APY
Vanguard: VMFXX (Federal Money Market Fund) — ~4.5% APY
Schwab: You must manually buy SWVXX (Schwab Value Advantage Money Market) to get higher rates — Schwab’s default bank sweep pays much less

How to switch at Schwab: Search for SWVXX in your account and buy shares; proceeds from sales automatically land in SWVXX rather than the default sweep.

Option 2: Purchase Treasury Bills

Buy 3-month or 6-month T-bills directly through your brokerage:

Available commission-free at Fidelity, Schwab, Vanguard, Interactive Brokers
Yields: approximately 4.2–4.4% for 6-month T-bills (May 2026)
State income tax exempt
When T-bill matures, funds return to your settlement account

Option 3: Short-Term Bond ETF

For slightly higher yield with minimal additional risk:

SGOV (iShares 0-3 Month Treasury Bond ETF): ~4.8% 30-day SEC yield
BIL (SPDR Bloomberg 1-3 Month T-Bill ETF): ~4.7% 30-day SEC yield
Highly liquid (can sell any trading day); invest dividends automatically

Option 4: Transfer Excess Cash to a HYSA

If you have cash you won’t invest for 6–12 months, transferring it to an external HYSA (4.50%+ APY) may earn similar or better rates while providing FDIC insurance and full liquidity. Downside: 1–3 business days to transfer back when ready to invest.

For Schwab Customers: The Cash Drag Problem

Schwab’s default bank sweep pays as little as 0.01% APY. On $50,000 in uninvested cash, this costs approximately $2,200/year vs Fidelity’s money market fund. The solution: buy SWVXX (Schwab Value Advantage Money Market) manually. This has no transaction fee and maintains the same liquidity.

Cash Management Accounts vs Brokerage Accounts — CMA vs brokerage
Ways to Use a Broker for Savings — brokerage as savings vehicle
Banking Basics Hub — complete banking guide

Written by WealthVieu

WealthVieu researches and writes data-driven personal finance guides using primary sources including the IRS, Bureau of Labor Statistics, Federal Reserve, and Census Bureau.

The content on Wealthvieu is for informational purposes only and should not be considered financial, tax, or investment advice. Consult a qualified professional before making financial decisions. Full disclaimer · Editorial policy