Square Charges 2.6% and Keeps About 1.1%. The Other 1.5% Was Never the Point.

In 2009, a glassblower named Jim McKelvey lost a sale of glass faucets and fittings because he couldn't take a credit card.⁸ The fix he and Jack Dorsey built was a small white plastic square that plugged into a phone's headphone jack and turned anyone into a merchant - and within roughly a year the platform had spread to tens of thousands of sellers.⁸ Fifteen years later more than 4 million sellers run $228 billion of payments a year through that ecosystem.¹ The reader still costs almost nothing. That was always the trick.

The official story is that Square is a payments company that makes its money on the 2.6% it charges to swipe a card. That number is real, it's printed on Square's own rate page, and it is almost entirely beside the point. Square does not keep 2.6%. It keeps a little over 1% - and the rest of the business it is actually building doesn't run on the swipe at all.

The rack rate everyone quotes, and the rate Square actually earns

Tap a card at a Square terminal and the seller is quoted a clean, memorable price: 2.6% + $0.15 for an in-person sale, with steeper rates for online and keyed-in transactions.⁵ It reads like Square's margin. It isn't. Most of that 2.6% leaves the building before Square sees a cent of profit - it goes out as interchange to the bank that issued the customer's card, plus card-network assessments, plus the cost of the fraud Square eats when a swipe goes bad. What's left over, the part Square keeps, is a much thinner slice. In its own SEC filings, transaction-based gross profit ran about 1.15% of the dollars processed in a recent quarter - a figure that has remained in the same narrow band across reporting periods.⁹ So the merchant pays 2.6%, and Square nets roughly 1.1%. The gap isn't profit Square is hiding. It's profit Square never had.

Once you see the real take rate, the strategy snaps into focus. A business that nets a hair over 1% on volume cannot afford to lose money winning customers - unless winning the customer unlocks something worth far more than the swipe. So look at the part of Square that loses money on purpose.

The card reader is bait, and Square says so in its filings

The white plastic square - and the terminals that followed it - is not a product line Square is trying to profit from. It's a funnel. In one recent quarter, Square's hardware brought in $43 million of revenue and ran a $25 million gross loss - a deliberate negative margin the company's own SEC filings disclose without apology, signalling that hardware is a funnel into higher-margin services rather than a revenue driver in its own right.⁶ Read that again: Square pays for the privilege of putting its reader on a counter. The thing that looks like the product is the cheapest possible way to acquire a financial-services customer. Get the reader into the seller's hand, and the swipes follow; once the swipes are flowing through Square, everything else Square sells has a captive audience that already trusts it with its money.

Why payments was never the destination

Here is the move that turns a low-margin processor into a financial-services aggregator. Once Square is sitting inside a seller's daily cash flow, it knows things a traditional bank would take weeks and a loan officer to learn: how much the business makes, when, how steadily, and whether last Tuesday was a good day. That data is the underwriting. It lets Square offer banking, loans, and software to a merchant it already understands better than any outside lender could - and sell those services at far richer margins than the 1.1% it earns on the swipe itself. The swipe is the sensor. The services are the business. In 2024 Block's $228 billion of Square volume was one input into $8.9 billion of total company gross profit (which includes Cash App and other segments), up from $7.5 billion a year earlier¹² - growth that increasingly comes from selling more to each seller, not just processing more swipes.

But isn't this just a payments company that got lucky on add-ons?

The fair objection is that this reframe overreaches - that Square is still, fundamentally, a card processor, and the banking and software are nice extras bolted onto a payments core. There's truth in it: payments are the on-ramp, and without the swipe there is no relationship to monetize. But the direction of the strategy is unambiguous in Square's own documents. Its filings now describe pursuing mid-market sellers - those doing more than $500,000 in annualized Square volume - as a deliberate growth segment, precisely because larger businesses buy 'more flexible and complex solutions' than the coffee cart ever would.⁷ That is not the roadmap of a company optimizing a swipe fee. It's the roadmap of a company that wants a bigger share of each seller's financial life. The honest counter is that none of this is locked in - free hardware and a thin take rate are easy for a rival to match, and the services layer has to keep earning its keep against real banks. The position holds because Square sees the cash flow first and underwrites off data nobody else has, not because the reader is hard to copy. One more reassurance for the 'small merchant only' story: the seller base is deliberately broad, with no single customer driving an outsized share of Square's volume,⁷ so the foundation remains distributed even as the ambition climbs upmarket.

Square makes its money on small merchants the way a bank makes its money on a checking account: not on the thing it gives you cheaply, but on everything that becomes possible once your money runs through it. The white plastic square was never a product to be sold at a profit. It was a way to stand inside 5.2 billion transactions a year¹ and watch which sellers were thriving - and then sell those sellers the loan, the deposit account, and the software they'd need next. The 2.6% is what they charge. The relationship is what they keep. And the cheapest piece of hardware in the business turned out to be the most valuable thing they ever gave away.