CarMax's Tuesday Print Tests a Used-Car Floor That Just Tipped Negative for the First Time in 2026

CarMax is uniquely exposed to the lower-credit consumer because three of its four margin engines all clear through the same balance sheet. Q1 FY27 already showed the trifecta: retail gross profit per unit fell $230 from the prior year's all-time record to $2,177, wholesale gross profit per unit slipped to $1,046 from $1,047, and CarMax Auto Finance income dropped 1% year-over-year to $140.2 million. Total gross profit for the quarter fell 4.4% to $854.4 million even as revenue rose 6.2% to $8.0 billion — a setup that puts each margin line directly in front of tomorrow's print.

Wholesale used-vehicle prices have stalled and then rolled. The Manheim Used Vehicle Value Index fell to206.2 in the first 15 days of September — down 1% from August's 208.2 and down 0.4% versus September 2025 — the first year-over-year decline since the index resumed rising in early 2026. From the March 2026 peak of 215.3, the index has now shed roughly 4.2%, with non-adjusted wholesale prices down 1.1% year-over-year, a sharper signal than the mix-adjusted figure. With wholesale inventory days' supply at 27.8 as of Sept. 15 (up 2.4 days year-over-year) and sales conversion averaging 55.8% (down 1.4 points year-over-year), the cycle has flipped from price tailwind to particle short for KMX's appraisal operation.

Tax-season relief masked the credit deterioration in 1H, but July ripped the cover off. Fitch's U.S. subprime 60+ delinquency index fell to 5.80% in1H26 (from 6.50% at year-end 2025) on tax-refund-driven borrower healing, with annualized net losses easing to 8.42% from 10.00%. That reprieve was always seasonal: Fitch's August2026 update showed July subprime delinquencies snapping back to 6.13%, just 77 bps below the 6.90% January peak — a 32-year record. The New York Fed's broader 90+ day auto delinquency measure climbed to 5.60% in Q1 2026, up from 5.21% a quarter earlier. The cycle has now re-accelerated into KMX's print, and CarMax Auto Finance provisions will be the first place it shows up in the company's results.

Carvana is the closest pure-play comp and it just printed pressure of its own. Q2 2026 delivered record volume (197,325 units, +38% year-over-year) and record revenue ($7.376B, +52%), yet total gross profit per retail unit fell to $7,014 — down $412 year-over-year though up $231 sequentially. Retail gross profit per unit of $3,547 topped consensus of $3,282, but the trajectory is the same: even with volumes surging, the per-unit economics are softening. If CarMax reports flat or down same-store used unit sales alongside a further drop in retail GP/unit, the read is unambiguous — the demand softness that hit Carvana in Q2 is now bleeding into KMX's Q2 FY27.

Ally Financial is the cleanest pure lender read. Retail used auto loans accounted for 63% of Ally Financial's Q2 2026 originations, and management described delinquencies as \"stubbornly high\" — net income was $410M on revenue of $4.07B despite the auto portfolio flag. Ally Financial does relatively little subprime lending, so its drag is the prime-borrower side; CarMax's CAF, by contrast, sits closer to the subprime tier and is the first place true subprime stress shows up in earnings. KMX's allowance commentary on the call will set the marker for whether Ally Financial and Capital One need to step up reserves into year-end.

Short-term (days to quarters): Tuesday's print is the catalyst. Consensus has revenue at roughly $6.97B and EPS at $0.72 versus the year-ago quarter's $6.59B and $0.64 — that implies ~6% revenue and ~13% EPS growth. If Q1 FY27's −$230 retail GP/unit slide extends, the consensus growth gets cut in half. Watch the revisions cycle: Q1 FY27 triggered a 7.6% single-day drop on the print, and any disappointment in same-store units or CAF provisions risks a similar move. The set-up is asymmetric for downside into Tuesday's open, since the macro backdrop has deteriorated against a still-positive growth consensus.

Long-term (1–3 years): The structural question is whether the used-car floor resets lower or whether the cycle re-inflates. Manheim's 4.2% drawdown from the March peak is modest by historical standards — the index dropped 14% from peak-to-trough in 2022 — so a deeper reset is plausible if subprime delinquencies continue re-accelerating toward the6.90% January peak. CarMax's new four-pillar growth strategy (introduced with Q1) bets on unit growth re-accelerating; if same-store comps stay negative through fiscal Q3 (Nov) and Q4 (Feb), will have to reset its unit-volume narrative and the TTM EV/Sales of 1.0x may compress toward the FY24 trough. The bull case is that CAF income stabilizes as the captive writes to higher-FICO borrowers and wholesale margins recover once tax-season resets the credit cycle in 1H27.