Charles Schwab Gives Away Trading Because the Real Money Is in Your Idle Cash

On October 1, 2019, Charles Schwab did something that should have been suicidal for a brokerage: it dropped its trading commission to zero.⁵ The headlines treated it as the death of the discount broker, the moment the business model finally ate itself. Schwab's own CFO put a price on the move — up to $100 million per quarter in lost revenue.⁵ It sounds like a wound. It was a rounding error. By that same disclosure, commissions were only about 4% of total net revenue.⁵ Schwab was not giving away its business. It was giving away the part of its business that barely mattered — to protect the part nobody talks about.

The official story is that Schwab is a brokerage that makes money when you trade. It hasn't been true for years. Schwab does not get rich when you buy a stock. It gets rich on the cash sitting still in your account between trades — money you've forgotten about, earning you almost nothing, quietly funding a spread that runs into the billions.

The real product is the cash you're not using

Here is the mechanism, stripped to its bones. When you open a Schwab account and leave cash in it — between trades, after a dividend, while you decide what to do — Schwab sweeps that cash into its own bank. It pays you a low rate on it, often close to nothing. Then it invests that money at a higher rate, in Treasuries and mortgage securities and the like, and keeps the difference. That difference is net interest revenue, and it is the engine. In 2022, with the Federal Reserve hiking aggressively, that spread machine produced $10.7 billion in net interest revenue — up 33% in a single year.² The same year, total revenue was roughly $20.8 billion.² Roughly half the company, from money that costs Schwab relatively little to hold. Free trading isn't charity. It's the funnel that fills the bank.

This is why the $0 commission was so easy to swallow. Robinhood had been offering commission-free trading since its public launch in 2015 — years before Schwab moved — and by 2019 the incumbent brokers had little choice but to follow. But for a company that earns the bulk of its keep on swept deposits, the commission was a tollbooth on the wrong road. Drop it, and you pull in more accounts, more assets, more idle cash — which is the only raw material the real business needs. By the end of 2024, Schwab held a record $10.10 trillion in total client assets across 36.5 million active brokerage accounts.⁹ Every one of those accounts is a tiny reservoir of cash Schwab would like to keep still.

The rates that built the machine are the rates that break it

Here is the part that turns a great business into a fragile one. The spread widens when rates rise — but rising rates also wake the customer up. When a client realizes their swept cash is earning a fraction of a percent while a money-market fund offers far more, they move it. Schwab's term for this is cash sorting, and it is exactly what it sounds like: clients sorting their dollars away from the low-yield sweep toward something that pays. In 2022, that sorting shrank Schwab's balance sheet by $115 billion — a 17% contraction — even as net interest revenue was hitting its peak.² The peak and the leak arrived together.

Then the bill came due. When client cash drains faster than expected, Schwab has to replace it with funding that actually costs money. In Q1 2023, borrowings from the Federal Home Loan Bank surged to $45.6 billion — nearly three times the prior quarter's level, and from a base of zero, since Schwab hadn't tapped the FHLB at all through the first three quarters of 2022.⁴ By Q1 2024, the damage showed in the headline number: net interest revenue fell $537 million, down about 19% year over year, as interest-earning assets dropped 13% on cash moving to higher-yielding alternatives.³ The exact same force — high rates — that produced the $10.7 billion peak was now hollowing it out.

Didn't the 2023 cash crisis just blindside them?

The fair objection is that this all looks like a company caught flat-footed — that cash sorting was a 2023 ambush, exposed when Silicon Valley Bank collapsed and markets started eyeing every balance sheet full of deposits and long-dated bonds. Not quite. Schwab's own CFO commentary from October 2022 described cash sorting plainly as an anticipated, ongoing process tied to the Fed's rate cycle — management knew the dollars would move and said so months before SVB.⁶ The honest counter, though, is that knowing a thing is coming is not the same as surviving its speed. The Fed tightened faster than almost anyone modeled, and sorting that was expected to be gradual became acute — which is exactly why Schwab found itself reaching for $45.6 billion of FHLB funding in a single quarter.⁴ The vulnerability wasn't ignorance. It was that the business is structurally long cheap deposits and short patience, and rising rates attack both ends at once.

There's a second crack worth naming, because it rhymes with the first. In June 2022, the SEC ordered Schwab to pay $187 million to settle charges that its Intelligent Portfolios robo-advisor — marketed as having no advisory fee — quietly allocated client money to a cash position that earned revenue for Schwab, effectively a hidden fee paid through lower returns.⁷ Same instinct, smaller scale: monetize the cash the customer isn't watching. When your business model is built on idle dollars, the temptation to keep dollars idle never fully goes away.

Schwab makes its money the way a bank does, while wearing the friendly face of a broker. The trades are free because the trades were never the point. The point is the cash that pools in tens of millions of accounts between decisions, swept into a bank that pays you little and earns a lot. In 2024 that machine was still vast — $19.6 billion in net revenue, $5.9 billion in net income, assets above $10 trillion.⁹ But the engine's genius and its weakness are the same fact: it runs on idle money in a world where money refuses to stay idle when rates are high. Schwab didn't give up commissions. It traded a tollbooth for a reservoir — and then learned the reservoir leaks fastest exactly when it's fullest.