AutoZone (NYSE: AZO) delivered a Q4 earnings beat. It looks better on the surface than it does underneath. Diluted EPS of $56.05 topped the $54.08 consensus by nearly 4%, and net sales of $6.6 billion rose 5.6% from last year. But the beat was engineered in gross margin, not in traffic. Same-store sales on a constant-currency basis came in at just 1.5% for the quarter, down sharply from 5.1% a year ago. The headline number cleared the bar. The underlying trajectory is softer.
Gross margin expanded 182 basis points to 53.3%, a striking move for a mature retailer. The drivers, however, are largely non-operational. Tariff refunds contributed 145 basis points, and a non-cash LIFO benefit added another 105 basis points. Strip those out, and the underlying margin was roughly flat, with higher commercial mix acting as a partial offset. This is not a story of pricing power or procurement gains. It is a story of accounting tailwinds that will not repeat at the same magnitude.
Operating expenses deleveraged to 33.4% of sales from 32.4% a year ago, a 100-basis-point drag management attributed to growth initiatives. That is a meaningful offset. The company is spending aggressively on store expansion — 175 new stores opened in Q4 alone, including 16 new Mega Hubs in the U.S. — and those investments are compressing near-term margins. Operating profit still grew 10.1% to $1.3 billion, but the leverage ratio is moving in the wrong direction for a retailer that historically runs a tight P&L.
The commercial business, AutoZone's key growth engine, posted domestic commercial sales of $1.9 billion, up 8.6% year-over-year. That is a deceleration from the 10.6% full-year pace and from the 6.0% growth in last year's Q4. Average sales per commercial program per week rose just 2.7%, down from 9.0% in the prior-year quarter. The commercial rollout is still adding doors — 6,443 stores now have commercial programs, up from 6,098 — but the per-program productivity is flattening. That is the metric to watch in FY2027.
International same-store sales on a reported basis were 10.7%, but constant-currency international comps were just 1.3%. The gap is almost entirely FX translation, not organic acceleration. Mexico and Brazil remain long-term growth stories — 78 of the 175 new stores opened in those two countries — but the near-term contribution to same-store sales is negligible. The international expansion is a capital allocation story, not a comp driver.
Share repurchases continued at a steady clip: $697.5 million in Q4, $2.0 billion for the full year, with $1.6 billion remaining under authorization. The diluted share count fell to 16.6 million from 17.2 million a year ago, a 3.3% reduction that contributed roughly $1.80 to EPS. Buybacks remain a structural support for EPS growth, but the pace is roughly in line with historical norms. There is no acceleration here.
CEO Phil Daniele noted that sales strengthened in the last eight weeks of the quarter and expressed confidence in acceleration across all three countries in fiscal 2027. That is a forward-looking claim the Q4 data does not yet support. The constant-currency comp deceleration from 5.1% to 1.5% is a wide gap to close. The company is investing heavily in store count and inventory — inventory rose 10.1% year-over-year, outpacing sales growth — and the payoff will depend on whether the late-quarter momentum is a genuine inflection or just noise.
The print is not a miss, but it is a warning. AutoZone's earnings beat was manufactured in gross margin by non-recurring items, while the core operating story — same-store sales growth and commercial productivity — is decelerating. The FY2027 outlook hinges on whether the last-eight-weeks trend holds. If it does, the current investment cycle will look prescient. If it does not, the SG&A deleverage will become a structural headwind rather than a temporary one.