Costco Case Study: Membership Economics and Customer Loyalty Strategy 2026
Why the retailer with the highest Experience score in retail built its customer loyalty strategy on a promise rather than a programme.
Every year, somewhere in the mid-autumn calendar, roughly 79 million households worldwide open an envelope or an email telling them their Costco membership is due for renewal.
Almost all of them pay without thinking twice.
That is not customer loyalty in the conventional sense. There is no gamified app tracking their purchases. No tiered status system awarding them points toward a free flight. No ambient store environment is curated to make them feel good about spending money. The warehouse they shop in is deliberately industrial. The sales floor associates are trained to replenish shelves, not to sell. The product assortment is curated to a fraction of what a conventional superstore carries, by design.
Yet in 2026, G&COI.’s Acumen platform records Costco at 97/100 on the Experience score: the highest of any brand in the retail category, with a +2 movement tied directly to checkout technology investments and member satisfaction improvements. In the same period, Forrester’s 2025 global Customer Experience Index found that North American CX quality had hit an all-time low. Twenty-five percent of brands declined for the second consecutive year. Seven percent improved. Costco, which operates no personalisation platform and runs no loyalty programme in any conventional sense, moved in the opposite direction.
The explanation is not complicated, but it requires accepting something that most loyalty programme architects resist: that the renewal rate of 92.7% in the US and Canada is not the result of Costco’s customer loyalty strategy. It is the result of Costco’s business model. The two are not the same thing.
The lesson for enterprise brand leaders has nothing to do with warehouses.
The fee that is not a fee: why Costco's membership model is a commitment architecture, not a revenue mechanism
Most enterprise brands treat customer loyalty as a commercial objective, something to be achieved through rewards, points, tiered status, and personalised communication. Costco treats it as the structural consequence of a specific commercial model. The annual membership fee, $65 for Gold Star, $130 for Executive, is not Costco's primary revenue mechanism. In fiscal year 2025, membership fee revenue reached $5.3 billion and contributed the majority of Costco's operating income, while net merchandise sales of $249 billion operated on product margins deliberately capped at 14% for regular items and 15% for Kirkland Signature products. Membership fees generated $2.68 billion in the first 24 weeks of fiscal 2026 alone, a figure that exceeded the $2.4 billion in operating income generated from merchandise sales across $134.2 billion in net sales. Costco's profitability does not come from selling products. It comes from convincing members to renew.
That distinction reshapes how Costco makes every operational decision. When a retailer's primary profit mechanism is merchandise margin, the incentive is to widen the gap between cost and price. When it is membership renewal, the incentive is to make the membership so valuable that the fee renewal becomes automatic. The 92.7% US and Canada renewal rate and 90.2% worldwide renewal rate, maintained even after a September 2024 fee increase from $60 to $65 for Gold Star and $120 to $130 for Executive that caused only a 0.1% renewal rate decline, is the commercial proof that Costco's commitment architecture is working. For enterprise brands evaluating their CRM and loyalty programme design, the Costco model asks a fundamental question: does your loyalty programme align your commercial incentives with your members' interests, or does it extract value from members while appearing to reward them?
The Executive membership tier reveals the depth of this architecture. At $130 annually, double the Gold Star fee, Executive members receive a 2% reward on qualifying Costco purchases. As of Q3 FY2025, Executive memberships represent 37.6 million of 79.6 million paid memberships, or 47% of the total member base. Yet Executive members account for 73.1% of global sales. The tier is not a loyalty programme add-on. It is a commercial model that deepens Costco's alignment with its highest-value members: as those members spend more, their 2% reward grows, making the $130 fee increasingly rational. Costco makes more money from members who spend more, and those members receive proportionally more value. The incentive structures are identical.
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The 14% rule: how a pricing cap operationalises a promise at enterprise scale
Most retail brands express their value proposition through marketing. Costco expresses it through a pricing constraint that is embedded in how the business operates and communicated, at least in its outcome, to every member who shops there. The 14% markup cap on regular merchandise and 15% on Kirkland Signature products is not a marketing message. It is an operational rule that shapes supplier negotiations, category selection, SKU count, and warehouse format simultaneously. Where a conventional retailer might carry 30,000 to 60,000 SKUs, Costco carries approximately 3,700 to 4,000 in any given warehouse. That constraint is not a limitation, it is the mechanism that makes the pricing promise commercially sustainable at scale.
The logic is architectural. A limited SKU count means Costco buys in extremely high volume from a small number of suppliers. High volume buying power enables price negotiation that produces the cost basis required to maintain a 14% cap while still generating enough gross margin to fund operations. The warehouse format eliminates the retail overhead, display fixtures, sales associates, and curated environments that conventional retailers pass on to consumers through higher prices. Every element of the Costco operating model is in service of the same promise: that the price the member pays is as low as it can commercially be. What drives customer loyalty in retail is rarely the sophistication of the loyalty programme. It is the confidence that the brand's commercial model is genuinely aligned with the member's interests. Costco's 14% cap is that confidence, operationalised.
The pricing discipline extends to proactive price reductions. When Costco's commodity costs fall, the company passes those reductions to members without waiting for competitive pressure. This behaviour is commercially irrational under a conventional retail margin model, you hold the lower cost and capture the expanded margin. Under Costco's membership renewal model it is rational: every action that reinforces the member's perception that Costco is on their side increases renewal probability and justifies future fee increases. The 2024 fee increase, the first in seven years, was absorbed with near-zero membership defection precisely because years of pricing discipline had built a trust reserve that a $5 or $10 fee increase could draw from without depleting.
Kirkland Signature as trust infrastructure: quality proof embedded in the product
Kirkland Signature is the most commercially significant private label brand in US retail. Annual sales reached approximately $86 billion in fiscal 2024, representing 33% of Costco's total revenue, a figure that exceeds the combined retail sales of many nationally recognised consumer goods brands. But Kirkland's commercial role in Costco's model is more precise than its revenue contribution suggests. It is the physical embodiment of the membership promise. Every Kirkland product that a member buys and finds to be of equal or superior quality to the national brand equivalent at a significantly lower price is a renewal event, a moment at which the member's confidence in the value of membership is reinforced. Kirkland is not a cost-reduction strategy with a private label wrapper. It is a brand intelligence mechanism that makes the membership promise tangible and verifiable at the product level.
The quality standard Costco applies to Kirkland products is deliberately higher than most private label programmes. Where conventional store brands compete on price against national brands by reducing quality to reduce cost, Kirkland competes on price parity at quality equivalence or better, with the constraint that the Costco markup cap applies to Kirkland products at 15%. That constraint requires Costco to source from manufacturers capable of producing at the required quality level within the cost structure that a 15% markup ceiling permits. The result is a private label that members trust not because it is cheap but because it is consistently good, and because they have experienced enough Kirkland products to have generalised that trust across the category.
The strategic implication for enterprise brands is that private label or owned-brand programmes built on cost reduction rather than quality commitment produce the opposite of the Kirkland effect. They train customers to regard the brand as a value-down option rather than a quality-forward signal. Kirkland's 33% share of Costco's total revenue, achieved without mass media advertising, is the commercial proof that a private label programme anchored to quality and price transparency can become a primary loyalty driver rather than a margin improvement tool. Consumer brand intelligence derived from Acumen platform tracking confirms that Costco's multi-segment member base, budget-conscious families, tech-forward professionals, and trend-seeking shoppers, all respond positively to the Kirkland range, across entirely different behavioral profiles and for entirely different reasons, because the quality promise is consistent regardless of the category.
The counterintuitive CX paradox: 97/100 without a personalisation app, ambient design, or trained sales floor
The 97/100 Acumen Experience score sits against an industry backdrop that makes it analytically remarkable. Forrester's 2025 global CX Index found that North American CX quality hit an all-time low, with 25% of brands recording declining scores for the second consecutive year. The brands that declined did so despite investing in the tools that the customer experience strategy in retail industry considers standard: personalisation platforms, mobile apps, loyalty programme redesigns, ambient store environments, and associate training programmes. Costco invested in none of these things in any conventional sense. The warehouse format is deliberately spare. The sales floor associates are trained to replenish and operate, not to sell. There is no personalisation engine surfacing product recommendations. There is no app-based loyalty mechanic rewarding purchase behaviour. Yet the Experience score is the highest in the retail category.
The resolution to this paradox is that Costco and its high-spending peers are measuring different things when they measure customer experience. Conventional CX programmes measure the quality of individual interactions, was the checkout fast, was the associate helpful, was the recommendation relevant. Costco's 97/100 score reflects something more durable: the member's generalised confidence that the commercial relationship is honest. A member who walks into a Costco warehouse does not need to evaluate whether the price is fair, whether the quality is genuine, or whether the staff member is trying to upsell them. The business model has already answered those questions structurally. The experience is not excellent because individual interactions are optimised. It is excellent because the conditions that produce distrust, opaque pricing, quality uncertainty, misaligned commercial incentives, have been removed from the model entirely.
This is the lesson for enterprise brands investing in CX programmes that are not producing the loyalty outcomes they expected: experience investment that does not address the structural conditions of trust will not produce durable loyalty improvements. A faster checkout, a better app, a more empathetic associate script, all of these improve individual interactions without changing the fundamental question that drives renewal decisions: does this brand's commercial model work in my interest? Brands that score below Costco on experience metrics despite spending significantly more on CX infrastructure are typically brands where that question has not been satisfactorily answered.
The digital tension: e-commerce growth at 14.8% and what higher online churn reveals about trust-based commerce
Costco's e-commerce performance in Q3 FY2025 was strong by any conventional measure: comparable e-commerce sales up 14.8% year-over-year, adjusted for foreign exchange effects up 15.7%, site traffic up 20%, average order value up 3%, and Costco Logistics deliveries up 31%. The digital channel is growing at nearly twice the rate of comparable in-warehouse sales. Yet the emerging tension in Costco's membership model is precisely here: online members show modestly higher churn rates than in-warehouse enrollees, and the renewal rate dipped 0.1 percentage points after the 2024 fee increase, with the composition of the member base shifting toward a larger proportion of online-recruited members. Understanding this tension requires understanding how the trust architecture that drives Costco's in-warehouse loyalty model translates, or fails to translate, to digital omnichannel commerce.
In the warehouse, the trust signals are immediate and physical. A member can verify the Kirkland product quality by opening the package. They can observe the warehouse format and draw their own conclusions about operating cost and pricing. They can watch the checkout process and confirm the price they pay. The membership promise is self-evident in the physical environment in a way that requires no explanation and builds experiential confidence with every visit. Online, those same signals require translation. A member who enrolls digitally, shops primarily through costco.com, and experiences Costco primarily as a delivery service is receiving the commercial benefit, the pricing, the Kirkland quality, without the experiential reinforcement that cements the in-warehouse member's renewal conviction. The trust architecture is intact, but the mechanism that makes it viscerally believable has been removed.
Costco's digital growth strategy must therefore navigate a specific challenge: how to translate the physical trust signals that drive 92.7% US and Canada renewal rates among in-warehouse members into digital experiences that produce equivalent renewal conviction among online-recruited members. This is not a conversion or acquisition problem. It is a brand experience architecture problem, the same class of problem that confronts any enterprise brand attempting to maintain the quality of the commercial relationship it delivers in its strongest channel as it expands into channels where the trust-building mechanisms are different. Costco's partnership with Affirm for flexible payment plans and its 20% site traffic growth confirm that digital investment is accelerating. The strategic question is whether that investment is directed toward replicating the warehouse's trust architecture online or toward optimising the digital funnel metrics that measure something else entirely.
The financial proof: when trust is the business model, the membership fee becomes the margin
The commercial proof of Costco's trust-based model is visible in its financial architecture in a way that is structurally unusual for a retailer. In the first 24 weeks of fiscal year 2026, Costco reported membership fee revenue of $2.68 billion. In the same period, operating income from merchandise sales across $134.2 billion in net sales was $2.4 billion. Membership fee revenue exceeded merchandise operating income. Costco is, by the most direct financial reading, a membership business that operates a retail warehouse to justify the membership rather than a retail business that charges a fee as a supplementary revenue stream. That reversal of the conventional retail profit model is the commercial consequence of building a business on a trust architecture rather than on a margin extraction model.
The durability of this model across economic cycles is confirmed by the renewal rate stability. In fiscal year 2025, membership renewal rates held at 90.2% worldwide and 92.7% in the US and Canada despite a fee increase, a challenging consumer environment characterised by persistent inflation, and an industry-wide CX decline documented by Forrester. Costco's diluted EPS grew at a 13% CAGR from fiscal 2015 to fiscal 2025. The Executive membership tier: the highest-fee, highest-commitment member segment, now represents 73.1% of global sales, indicating that the members most committed to the relationship are also the most commercially valuable. In retail industry terms, the correlation between depth of trust and depth of commercial value is rarely this clean or this well-documented.
The strategic implication for enterprise brand leaders evaluating their loyalty economics is specific. A loyalty programme that generates headline renewal rates but does not structurally align the brand's commercial incentives with the member's interests is building retention on convenience rather than conviction. Members retained by convenience defect when a more convenient alternative emerges. Members retained by conviction, the kind that produces a 92.7% renewal rate after a fee increase in a deflationary consumer environment, do not defect because no alternative offers the same structural alignment. Costco's EPS growth, its membership revenue-to-operating-income ratio, and its renewal rate stability are not three separate performance metrics. There are three readings of the same commercial fact: that trust, when it is the actual business model rather than a programme objective, produces financial results that conventional loyalty mechanics cannot replicate.
Executive takeaways
– Brands whose primary profit mechanism is membership renewal develop commercial incentive structures that are fundamentally different from brands whose profit mechanism is merchandise margin, and that difference produces loyalty outcomes no overlay programme can replicate.
– Organisations that attempt to improve customer experience scores without addressing the structural conditions of trust, pricing transparency, quality consistency, incentive alignment, consistently find that CX investment produces diminishing returns at the loyalty layer.
– Private label programmes anchored to cost reduction rather than quality commitment train members to regard the owned brand as a value-down option, generating the opposite dynamic from Kirkland Signature's 33% revenue share and cross-segment trust signal.
– The divergence between in-warehouse and online renewal rates in Costco's member base reveals a pattern visible across enterprise commerce: the trust architecture that drives loyalty in the highest-performing physical channel does not automatically transfer to digital channels, and the investment required to replicate it digitally is different in kind from standard digital experience optimisation.
– Loyalty programmes that generate high renewal rates under stable conditions but cannot sustain them through fee increases, competitive entries, or economic pressure are programmes built on inertia rather than conviction; the distinction is commercially significant when conditions change.
Why this matters now
Forrester's 2025 global CX Index identified a structural deterioration in consumer experience quality that predates and outlasts any single economic cycle: 21% of brands globally declined, 73% remained unchanged, and only 6% improved. In North America specifically, CX quality hit an all-time low for the second consecutive year, with brands across retail, financial services, and consumer goods investing more in experience infrastructure while delivering less of the experience quality that drives renewal decisions. The gap between the experience brands intend to deliver and what consumers actually experience is, by Forrester's own assessment, widening. Costco's +2 movement in the Acumen platform during this same period is not a minor data point. It is a directional signal about what is actually driving consumer trust at a moment when most brands are moving in the opposite direction.
The urgency for enterprise brand and commerce leaders is that the conditions producing industry-wide CX deterioration are not temporary. Economic volatility, consumer price sensitivity, and the proliferation of loyalty programmes that compete on mechanics rather than on genuine value alignment have created a market environment in which the trust deficit between brands and consumers is structurally deepening. Costco's model, built before the era of personalisation platforms, AI-driven recommendations, and mobile loyalty apps, is outperforming those technologies not because it is simpler but because it is more honest. The brands that recover trust in this environment will be those that ask the question Costco answered structurally forty years ago: does our commercial model actually work in our members' interest, and is that alignment visible and verifiable at every touchpoint?
Conclusion
There is a detail in the Costco story that tends to get lost in the analysis of renewal rates and membership economics. Costco did not set out to build the highest-scoring retail brand in consumer experience tracking. It set out to build a business that made the membership fee worth more than it cost. The 97/100 Acumen Experience score, the 92.7% US and Canada renewal rate, the 13% EPS CAGR across a decade, these are byproducts of that original intention, compounded across forty years of consistent operational decisions. Costco did not plan to become the trust benchmark for retail. They just refused, consistently, to do the things that erode trust.
That is the uncomfortable truth the Costco case study contains for most enterprise brand leaders. The conditions producing industry-wide CX deterioration, documented by Forrester across 25% of brands declining for a second consecutive year, are not mysterious. Brands are investing in experience infrastructure while widening the gap between their commercial incentives and their members’ interests. Loyalty programmes reward behaviour without aligning the business model. Personalisation platforms improve individual interactions without addressing the structural conditions of trust. Costco’s model, built before any of those platforms existed, is outperforming them not because it is simpler but because it answered a question most brands have not yet asked: does our commercial model actually work in our members’ interest? The brands that recover trust in the coming years will not do it by optimising their loyalty mechanics. They will do it by examining whether their business model deserves the loyalty they are spending to retain.
G&CO. works with enterprise brands in retail, financial services, and luxury to audit and redesign the commercial architectures that determine whether customer loyalty is structural or purchased. If the Costco model raises questions about your own membership economics, pricing discipline, or loyalty programme design, submit an inquiry to G&CO. on our contact page or click on the blue “Click to Contact Us” button on the bottom right corner of your screen for your convenience. We look forward to hearing from you.
Frequently asked questions
What drives Costco's customer loyalty strategy?
Costco's customer loyalty strategy is driven by a structural alignment between the company's primary profit mechanism, membership fee renewal, and the member's interest in receiving maximum value for their annual fee. Unlike conventional retail loyalty programmes that reward purchase behaviour with points or discounts, Costco aligns its commercial incentives with members by capping product markups at 14% and using membership fee revenue, rather than merchandise margin, as its primary profit source. This creates a commercially self-reinforcing model: every decision that increases member value, proactive price reductions, Kirkland Signature quality investment, limited SKU curation, directly increases the renewal probability that drives Costco's profitability. The 92.7% renewal rate in the US and Canada is the measurable consequence of that structural alignment, not of a loyalty programme.
What can brands learn from Costco's customer loyalty model?
What brands can learn from Costco's customer loyalty model is the distinction between loyalty built on structural alignment and loyalty built on programme mechanics. Most enterprise loyalty programmes reward behaviour without changing the underlying commercial relationship, the brand still optimises for margin extraction, and the loyalty programme is an overlay designed to reduce the churn that extraction produces. Costco's model removes the conditions that produce churn at the structural level: pricing transparency, quality consistency, and a fee structure that makes the brand's profitability dependent on genuine member satisfaction rather than on purchase volume. Enterprise brands in retail, financial services, and subscription commerce can apply this lesson by auditing whether their commercial model's incentive structures are aligned with or opposed to their members' interests, and whether the loyalty investment they are making is addressing programme mechanics or model fundamentals.
How did Costco achieve the highest retail Experience score without a conventional CX strategy?
Costco achieved a 97/100 Experience score in Acumen platform tracking, the highest recorded for any retail brand, without a personalisation app, ambient store design, or trained sales floor associates because it built the conditions of trust into its business model rather than into individual customer interactions. The warehouse format, the 14% markup cap, the Kirkland Signature quality commitment, and the membership fee structure collectively eliminate the conditions that produce consumer distrust: opaque pricing, quality uncertainty, and misaligned commercial incentives. A member who shops at Costco does not need to evaluate individual interactions for signs of fairness because the model has answered the fairness question structurally. This is why Costco's Experience score has moved in the opposite direction from the industry-wide CX decline documented by Forrester's 2025 global CX Index, the score reflects confidence in the commercial relationship, not satisfaction with individual touchpoints.
What does Costco's membership economics model reveal about what drives customer loyalty in retail?
Costco's membership economics reveal that what drives customer loyalty in retail at the most durable level is not rewards, personalisation, or service quality, it is the member's confidence that the brand's commercial model works in their interest. Costco's membership fee revenue of $5.3 billion in fiscal 2025, contributing the majority of operating income on net sales of $249 billion, demonstrates that a business model built on genuine value alignment produces financial outcomes that conventional merchandise margin retail cannot match for durability. The 0.1% decline in renewal rates following the 2024 fee increase, the first in seven years, confirms that members who trust the model absorb price increases without defecting, because the fee increase does not change the fundamental nature of the commercial relationship. For enterprise retail brands, the implication is that loyalty investment directed at model alignment, pricing discipline, quality commitment, incentive structure, produces more durable renewal outcomes than loyalty investment directed at programme optimisation.
