Costco Reports Surging Q4 Profits as Tariff Refunds Fuel Price Reductions and Legal Battles

Issaquah, Washington — Costco Wholesale Corporation has reported a stellar financial close to its fiscal year, driven by robust consumer demand, strong top-line growth, and a windfall of federal tariff refunds. However, the retail giant’s strategy for handling those returned millions has thrust the warehouse club into a complex web of consumer litigation and ongoing market scrutiny.

During the company’s fourth-quarter and fiscal year 2026 earnings call on Thursday, CEO Ron Vachris and top financial executives revealed that Costco has "predominantly" used the influx of initial International Emergency Economic Powers Act (IEEPA) tariff refunds to directly lower prices for its shoppers. While the move has been praised as a win for consumers battling persistent economic headwinds, it has also sparked controversy, positioning Costco at the center of proposed class-action lawsuits.

Despite these legal hurdles, the Issaquah-based retailer posted impressive financial metrics for the quarter, cementing its status alongside Amazon and Walmart as one of the undisputed "Big 3" market share gainers in modern retail.

Main Facts

The core narrative emerging from Costco’s fiscal 2026 fourth-quarter report centers on three major developments: massive financial growth, the tactical deployment of federal tariff refunds, and the macroeconomic realities shaping consumer goods pricing.

• Strong Financial Performance: Costco reported a net income of $2.99 billion for the fourth quarter, marking a significant increase from the $2.6 billion recorded during the same period in fiscal 2025. Total net sales surged 11.2% year-over-year to reach $93.9 billion.
• Tariff Refund Deployment: Following a landmark U.S. Supreme Court decision in February invalidating certain tariffs imposed under the IEEPA by former President Donald Trump, U.S. Customs and Border Protection began issuing massive refunds to importers. Costco leadership confirmed that these unexpected capital infusions have been funneled primarily into lowering store prices rather than padding corporate margins or issuing direct customer rebates.
• Legal Friction: The decision to lower prices instead of issuing direct refunds to historical buyers has ignited consumer backlash. Costco is currently defending itself against proposed class-action lawsuits—most notably a high-profile case initiated by an Illinois shopper—alleging deceptive trade practices.
• Macroeconomic Climate and Inflation: Executives noted that inflation remains relatively stable in the low single digits, though volatility persists. While items like eggs, dairy, and butter showed signs of deflation, geopolitical tensions in the Middle East drove inflation in gas, motor oil, and petroleum-based resins.

Chronology of Events

To understand how Costco arrived at its current financial and legal standing, it is necessary to trace the timeline of regulatory changes, corporate policy shifts, and legal confrontations that have defined the past several years.

The Legislative and Judicial Catalyst (Early 2025)

The foundation of the current financial landscape was laid during the implementation and subsequent legal dismantling of executive tariffs. Imposed under the IEEPA, these tariffs raised the cost of importing various goods into the United States. Retailers absorbed these costs initially, frequently passing them on to consumers through higher retail pricing.

The Supreme Court Decision (February 2026)

In a pivotal ruling, the U.S. Supreme Court struck down the administration’s use of the IEEPA to levy these specific tariffs, declaring them unconstitutional and beyond the scope of executive authority. This ruling triggered a massive refund mechanism through U.S. Customs and Border Protection, allowing major importers like Costco to recoup billions of dollars in duties previously paid.

The May 2025 Earnings Call and Early Legal Salvos (Spring 2025)

During a previous earnings call, CFO Gary Millerchip remarked that Costco views raising prices as a "last resort." This philosophy, however, did not prevent the retailer from adjusting prices upward during peak tariff pressures. Seizing on these comments, an Illinois customer filed a proposed class-action lawsuit against Costco in March 2025. The plaintiff argued that because customers bore the ultimate cost of the IEEPA tariffs through inflated retail prices, any subsequent refunds should be shared directly with them, rather than used by the company to subsidize future operational pricing.

Costco’s Legal Pushback (May – September 2026)

In May, Costco’s legal team filed a motion to dismiss the lawsuit, arguing that the claims lacked legal merit. Attorneys maintained that consumers received the exact goods they paid for at explicitly stated prices, and Costco never contractually or implicitly promised retroactive refunds. As of September 2026, the retailer is awaiting a definitive judicial ruling on the dismissal motion.

The Q4 Earnings Reveal (September 25, 2026)

During the September 25 earnings call, executives provided updated clarity on how the IEEPA refunds are being managed, confirming that the bulk of the money has been utilized to aggressively lower prices across multiple product categories. Executives also announced that because tariff adjustments, non-recurring items, and reinvestments will continue to color their books, they will provide dedicated updates on these metrics throughout fiscal 2027.

Supporting Data and Financial Health

Financial analysts have responded favorably to Costco’s fourth-quarter numbers, pointing to strong top-line expansion despite minor friction points in membership metrics.

In a client note published on Friday following the earnings release, analysts at Citigroup maintained a "neutral" rating on Costco, labeling the company a "crown jewel in retail." Citi highlighted that Costco’s Q4 results delivered a clear "upside on sales and margins," though this was slightly tempered by a minor deceleration in membership growth rates.

Key Financial Indicators:

• Q4 Net Income: $2.99 billion (up from $2.6 billion year-over-year).
• Q4 Net Sales: $93.9 billion (an 11.2% increase compared to the previous year).
• Inflation Tracking: Low single digits overall, marked by stark divergence across sectors. Deflation was observed in basic agricultural and dairy commodities (eggs, milk, butter), while inflation spiked in electronics, motor oil, and fuel due to foreign supply chain pressures and Middle Eastern conflicts.

Citi’s analysis solidifies Costco’s standing alongside retail behemoths Walmart and Amazon as the dominant forces commanding market share in the post-pandemic retail economy.

Official Responses and Corporate Culture

While corporate finance and litigation formed the backbone of the earnings call, Costco leadership also maintained its long-standing tradition of blending serious economic disclosures with lighthearted consumer-focused announcements.

Addressing the Class-Action Lawsuits

Costco executives largely steered clear of deep legal commentary regarding the ongoing class-action litigation during the formal question-and-answer session. However, court filings make the company’s defensive posture clear. Costco’s legal counsel emphasized that retail transactions are final at the point of sale and that utilizing refunded tariff revenue to lower prices benefits the broader consumer base equitably, rather than selectively enriching past buyers through administratively complex retroactive rebates.

The Return of a Fan Favorite

Amidst dense economic forecasting regarding oil volatility, supply chain vulnerabilities, and trade policy uncertainty, CFO Gary Millerchip took a moment to address a vital piece of internet culture: the food court menu.

"I do want to address the speculation that’s been blowing up our social media feed and confirm that the rumors are true, for a limited time the food court churro will be returning to all our U.S. locations," Millerchip announced, nodding to a viral teaser recently posted on the company’s official Instagram account.

This lighthearted touch underscored Costco’s unique brand loyalty model—maintaining customer engagement through staple value offerings (such as its famously unwavering $1.50 hot dog and soda combo) even as the company navigates complex macroeconomic storms.

Implications for the Retail Sector and Fiscal 2027

As Costco looks ahead to fiscal 2027, the company faces a multifaceted operational landscape defined by external volatility and internal strategic adjustments.

Macroeconomic Uncertainty

CFO Gary Millerchip expressed caution regarding future economic projections, citing the unpredictability of international conflicts and their direct transmission into energy markets.

• "We think it’s difficult to predict what’s going to happen with inflation," Millerchip stated during the call. "I think especially because of the uncertainty around the situation with the Middle East and how long that might impact and what you might see in terms of volatility in prices on oil and oil-related items. And then, of course, there’s still uncertainty around potentially where exactly we land on the tariffs that exist today or could exist in the future."

Precedent for Tariff Refunds

The outcome of Costco’s ongoing legal battles over the IEEPA refunds will likely carry profound implications for the entire retail and import sector. If courts side with the consumer plaintiffs, it could establish a legal precedent forcing corporations to distribute federal regulatory windfalls directly back to historical purchasers. Conversely, a victory for Costco will affirm the traditional corporate prerogative to treat tax and tariff adjustments as general corporate revenue to be deployed at management’s discretion—whether through margin expansion, operational investment, or broad-based price deflation.

For now, Costco remains committed to its consumer-facing strategy: absorbing macro shocks, keeping price points competitive through regulatory rebates, and keeping its millions of loyal warehouse members well-fed with affordable hot dogs and returning menu favorites.