Here is a number that should not make sense: Costco earns roughly three cents of net profit on every dollar of merchandise it sells. Three cents. A corner bodega does better than that. Yet Costco is one of the most consistently profitable retailers on earth, and the explanation sits in a single line of its income statement that most shoppers never think about: the annual membership fee.
The membership fee is not a side business. Costco’s net margin has held in a narrow band across every year from fiscal 2021 through fiscal 2025, even as revenue grew by roughly forty percent. The merchandise is essentially a break-even proposition, priced to keep members coming back. The fee is where the money actually lives, and the question worth examining right now is how durable that engine really is.
In one breath
Costco’s filed numbers show that membership fees, though a sliver of total revenue, account for an estimated two-thirds or more of operating profit, meaning the merchandise operation barely covers its own costs. The stock trades at a premium that assumes the membership machine keeps growing without a hitch. The open question is whether a fee that just rose for the first time in seven years can keep attracting new members and holding existing ones at the same rate, or whether the price of admission is finally approaching a ceiling.
How the machine was built
Costco’s model is old enough to have grandchildren. The core logic, established in the 1980s, is that a paid membership creates a self-selecting customer: someone who has already committed money before walking through the door is motivated to shop enough to justify the fee. That psychology lets Costco price merchandise at cost plus a thin markup, undercutting almost everyone, which in turn makes the membership feel worth renewing, which funds the next year of thin-margin selling. The flywheel is elegant and, as the filed numbers show, remarkably stable.
The fee hike history, sourced from Mashed’s documented timeline, shows a disciplined cadence: increases spaced years apart, each modest enough that it rarely triggers cancellations. The most recent hike came in September 2024, the first in seven years, and Inc. reported it paid off: membership fee revenue grew strongly in the period following the increase, while the renewal rate barely budged.
For a saver trying to understand what makes this business tick, the key insight is that the fee is nearly pure profit. There is no inventory to buy, no warehouse space consumed, no truck to load. Every dollar of fee revenue flows almost directly to the bottom line, which is why a line item representing a small share of sales can fund the majority of operating profit.
What the Q3 2026 filing actually shows
The most recent filed figures come from Costco’s third-quarter fiscal 2026 report, covering the period ended May 10, 2026. Membership fee income for the quarter reached $1.37 billion, up roughly eleven percent from the same quarter a year earlier. Stripping out currency effects, the underlying growth was still nearly double the rate of the broader economy.
The member count tells a similar story. Total paid members reached 82.9 million, and a growing share held Executive memberships, the higher-priced tier that now accounts for roughly half the member base. That Executive share matters because those members pay twice the base fee and, as TheStreet reported, are upgrading in growing numbers, drawn partly by new perks introduced in 2026: a monthly purchase credit and early shopping access seven days a week.
The renewal rate is the number that underpins everything else. In the U.S. and Canada, 92.2% of members renewed as of Q3 2026. Think of it this way: if a gym had nine of every ten members automatically re-sign each year without being asked, the gym’s revenue would be almost perfectly predictable. Costco’s membership revenue is close to that. High predictability is worth a premium, and the market is paying one.
The renewal rate is the filed number that most directly reflects how sticky the fee is, the metric investors and analysts typically weight most heavily when evaluating the durability of the membership model.
The mood the market is in
Our data shows Costco’s shares sitting roughly fourteen percent below the fifty-two-week high as of late July 2026, after a year of flat-to-negative returns. The price-to-earnings multiple, a measure of how much investors are paying for each dollar of annual profit, stands at 51.8 times, just above the stock’s own decade median. The price-to-sales ratio is also slightly above its historical average.
In plain terms: the market is paying a slight premium to Costco’s own history, even after a year of weak returns. That is not a bargain price. It is a price that assumes the membership machine keeps compounding without a stumble. Bernstein analyst Zhihan Ma, writing in early July 2026 and cited by TheStreet, published a higher valuation estimate and an outperform rating, noting that inflation pressures push budget-conscious shoppers toward bulk buying, which she argued reinforces Costco’s value proposition. That view is one data point in the analyst landscape, not a conclusion this analysis adopts. It is also already baked into a premium multiple.
Where math and mood pull apart
The bull reading is straightforward. The membership profitability structure is genuinely unusual: for the first half of fiscal 2026, membership fees alone exceeded the operating income generated by all merchandise sales combined. That is a business where the product is almost free to the company, and the access fee is the product. Executive membership growth running well ahead of the overall member base suggests members are voluntarily paying more, not less.
The bear reading is about valuation math. A premium multiple on a business growing earnings in the mid-teens leaves almost no room for error. Amazon Prime, with an estimated two hundred million U.S. members per Yaguara’s compiled data, bundles streaming, shipping, and grocery delivery at a higher annual price. Walmart+ offers a competing bundle priced below Prime, though still above Costco’s base membership. Costco competes on bulk groceries and gas. The value proposition is different, not obviously superior, and the competitive landscape is not standing still.
CEO Ron Vachris stated on the Q3 2026 earnings call that Costco’s goal is “to be the first to lower prices and the last to raise them.” That discipline is real and documented across decades. It also means the next fee increase, whenever it comes, will be modest and infrequent, which caps the upside from fee growth alone.
The honest tension is this: the filed numbers describe a business that is genuinely excellent. The current price describes a market that already knows it.
What would change the read
The fiscal year 2026 annual report, which Costco typically files in October, will show the full-year membership fee total and the year-end renewal rate. If the worldwide renewal rate holds near its current level and Executive membership share continues climbing past half the base, the math supporting the current multiple gets stronger. If renewal rates slip meaningfully, or if member growth decelerates well below recent trends, the mood premium built into today’s multiple becomes harder to justify on filed evidence alone. The Q4 2026 earnings call, expected in September, is the next data point.
Reading the numbers
$1.37 billion in quarterly membership fee income. This is the total Costco collected in membership fees during the three months ended May 10, 2026, per the Q3 2026 filing. It matters here because this single revenue line, representing less than 2% of total sales, is estimated to fund roughly two-thirds of the company’s operating profit. A household analogy: imagine a landlord whose rental income is a small fraction of total property value, but covers nearly all living expenses. The merchandise business is the property; the fee is the rent check that actually pays the bills.
92.2% U.S. and Canada renewal rate. This is the share of expiring memberships that were renewed in the most recent quarter, per the Q3 2026 filing. In practical terms, for every 1,000 members whose cards expired, 922 paid again without being asked. That near-automatic renewal is what makes membership revenue so predictable, and high predictability is the characteristic that has historically commanded premium multiples in subscription-model businesses, though whether the current multiple is warranted remains the central analytical question. A renewal rate that dropped even to 88% would remove hundreds of millions of dollars from annual fee income.
P/E of 51.8 times. A price-to-earnings multiple is simply the price tag investors are paying per dollar of annual profit. At 51.8 times, a buyer of Costco shares today is paying $51.80 for every $1 the company earns in a year, per our published methodology. The company’s own decade median is 50.3 times, so today’s price is slightly above average for Costco itself, and well above the broad market average of roughly 20 to 25 times. The multiple is not extreme by Costco’s own history, but it leaves little cushion if membership growth slows or a fee increase triggers unexpected churn.
For the standing yardsticks on Costco Wholesale — the price tag, the filed record, and the four gauges, refreshed with each edition — see the BullScope Evidence Sheet: Costco Wholesale.
Sources
- Costco Q3 2026 Earnings Call Transcript, The Motley Fool
- Costco Q3 2026 Earnings Release, StockTitan
- Costco Earnings Data, 24/7 Wall St.
- Costco Membership Fee Increase Analysis, Inc.
- Every Time Costco Raised Membership Prices, Mashed
- More Costco Members Paying Double, TheStreet
- Costco Stock Outlook, Bernstein via TheStreet
- Costco Deep Dive, Massive Moats
- Amazon Prime Statistics, Yaguara
- Costco Sales and Membership Growth, The Motley Fool
Corrections (July 21, 2026): An earlier version said revenue roughly doubled from fiscal 2021 through fiscal 2025; it grew by about forty percent. It also described Walmart+ as lower-priced without saying compared to what; Walmart+ costs less than Amazon Prime but more than Costco’s base membership.
