Every large brokerage offers an idle cash sweep, and most pay well under 1%. Schwab’s bank sweep, Fidelity’s FCASH, Merrill Edge’s cash program, and comparable vehicles at other firms funnel uninvested balances into affiliated or partner banks that earn the full short-term rate and pass along a small fraction. US Treasury 3 Month Bill ETF (NASDAQ:TBIL) has become a common swap for investors who want the actual Treasury bill yield credited to their own account rather than retained by the intermediary. Sweeps do serve a purpose, and TBIL will not replace all of them, but the dollar gap on any meaningful balance is now hard to ignore.
Why Broker Sweeps Exist
Cash sweeps hold dividends, deposits, and trade proceeds inside an FDIC-insured wrapper, ready to redeploy at the next click. The convenience is real, and FDIC coverage matters for balances spent or invested within days. On a $500 float waiting for next week’s trade, none of this discussion matters.
Scale changes the picture. The Federal Reserve’s target rate upper bound sits at 3.75%, unchanged since December 11, 2025. Three-month Treasury bills yield 3.83%, and 52-week bills yield 4.07%. A sweep paying under 1% on a $25,000 balance delivers roughly $250 or less over a year. The spread between what the broker earns on that cash and what it pays back is intermediation profit.
What TBIL Actually Does
Tracking the ICE BofA US 3-Month Treasury Bill Index by holding on-the-run 3-month bills and rolling them at auction is what this fund does. The fund launched in August 2022, carries an expense ratio of 0.15%, and holds roughly $7.20 billion in assets. Distributions arrive monthly. Over the trailing twelve months, TBIL paid $1.86 per share against a current share price of $49.97, producing a trailing distribution yield near 3.73%. Total return over the past year was 3.88%.
Two features add value beyond the headline yield. Treasury interest is exempt from state and local income tax, which matters materially in high-tax states. Credit risk is negligible because the fund holds only U.S. Treasury bills, and the share price stays close to $50 within a narrow band as coupons accrue.
The Dollar Gap
On a $25,000 idle balance held for a year, a sweep paying 0.5% delivers about $125. TBIL at a 3.73% net yield delivers roughly $933. The roughly $800 spread is the check the broker had been writing to itself.
Compounded over five years, the same balance moved from a low-yield sweep into a T-bill ETF produces a materially larger ending value, and the gap widens as balances grow.
What You Give Up
This fund isn’t FDIC insured. U.S. Treasury bills are backed by the full faith and credit of the U.S. government, which most fixed-income investors treat as a solid backstop, but that’s a different guarantee from FDIC coverage and worth knowing before you make the switch. TBIL’s government backing is strong, but it’s not the same as deposit insurance.
Settlement also differs. Sweep cash is available instantly for new trades; ETF shares settle T+1. Active traders can keep a small working balance in sweep and move the bulk to TBIL, capturing most of the yield without disrupting execution. NAV can move by a few cents on any given day, so very short holding periods can produce small principal moves.
Tax mechanics deserve attention. Selling an appreciated equity position to fund TBIL in a taxable account can create capital gains. Moving idle cash, which has no embedded gain, avoids that friction.
Making the Move
Execution is straightforward: buy TBIL like any other ETF using the sweep cash balance. Most brokers fill the trade the same session, and the position begins accruing yield immediately. When cash is needed, sell shares and proceeds return to the sweep by the next business day. There is no minimum, no lockup, and no early withdrawal penalty.
Whether the Swap Fits Your Situation
For balances above a few thousand dollars held longer than a few weeks, the arithmetic favors TBIL. For working cash clearing the account within days, the sweep remains functional. With the Fed on pause at 3.75%, the spread persists as long as sweep rates stay anchored well below the policy rate. Readers weighing the switch should confirm their broker’s current sweep rate and their own state-tax situation before deciding how much of an idle balance to move.
Contact [email protected] for any questions or corrections.
Top Gaining Stocks
Top Losing Stocks