Costco Beat on Earnings. About $0.15 a Share of It Was a One-Time Tariff Refund.

Costco reported fiscal Q4 EPS of $6.75, up 15% year over year, and revenue of $95.7 billion, up 11%, both ahead of consensus; however, EPS included a non-recurring $0.15-per-share tariff-refund benefit. Excluding the refund, EPS was $6.60 and rose about 12%, while adjusted comparable sales increased 6.7% and worldwide traffic grew 3.3%. Membership-fee income growth slowed to 7.3% from 14% in fiscal Q1 as the prior fee-hike benefit rolls off, raising concerns over Costco's 43x earnings valuation despite shares already falling 18% from their 52-week high.

Analysis

COST's risk is not demand deterioration but earnings-quality deceleration colliding with a premium multiple. The recurring profit engine is reverting to its underlying member-growth rate while merchandise margin remains structurally constrained by the company's value proposition; consequently, even stable mid-single-digit comp growth may not support the current earnings multiple. Refund-related price investment can preserve traffic near term, but it also makes reported sales and member value harder to translate into sustainable gross-margin expansion.

Over the next 1-3 months, the relevant catalyst is FY27 membership-income guidance and renewal-rate/executive-member disclosure, not another headline EPS beat. A shift toward high-single-digit fee-income growth lowers the probability of consensus double-digit EPS estimates being sustained, creating downside through both revisions and multiple compression. The first quarter may still be flattered by additional refunds, raising the risk that investors misread a transient benefit as improved operating leverage.

The second-order beneficiary is Walmart (WMT): it has comparable grocery-led traffic exposure but materially greater advertising, marketplace, fulfillment and membership monetization optionality, which diversifies its margin engine. A COST derating would also challenge the premium valuation umbrella for warehouse retail, though BJ's Wholesale (BJ) has lower valuation risk and more room to monetize private label and digital engagement. Consensus may over-focus on the stock's drawdown from its peak; absent an acceleration in recurring profit growth, a lower share price alone does not establish value when the earnings multiple remains elevated.

The bear case is falsified if Costco demonstrates recurring ex-fee operating leverage: sustained ex-fuel comp above 7%, accelerating renewal/executive penetration, and gross-margin expansion excluding refunds for two consecutive quarters. Conversely, a guide-down in membership income, normalization of traffic after refund-funded pricing, or a sub-10% EPS growth outlook would likely force a sharper valuation reset over 6-12 months.

Key Decisions for Investors

• Initiate a 3-6 month relative-value position: short COST / long WMT, sized beta-neutral. Target a 10-15% narrowing in COST's valuation premium if FY27 recurring EPS expectations reset; exit if COST reports two quarters of >7% ex-fuel comps plus >10% recurring membership-income growth.
• For directional exposure, buy COST 6-month put spreads struck roughly 5% and 15% below spot rather than naked puts. The thesis requires an estimate or multiple catalyst, and the spread limits premium decay if operational execution remains solid; reassess immediately after FY27 first-quarter guidance.
• Avoid adding long COST solely on a post-peak drawdown. Put an alert on management's disclosed renewal rate, executive-member mix, ex-refund gross-margin change, and FY27 fee-income outlook; upgrade only if these show renewed recurring-profit acceleration.
• Monitor BJ as a lower-multiple warehouse-retail substitute, but do not initiate until its next comparable-sales and membership trend confirm share gains. A COST-specific de-rating can spill over to the group initially, offering a more attractive entry if BJ's fundamentals remain intact.