SG&A as a percentage of gross profit is an auto-retail efficiency measure comparing selling, general, and administrative expense with total gross profit.
SG&A as % of gross profit = SG&A expense ÷ gross profit × 100%
If an auto retailer reports $720 million of SG&A and $1.0 billion of gross profit, the ratio is 72%.
That leaves 28% of gross profit before other operating items included below SG&A.
Why gross profit is the denominator
A dealership can sell a $50,000 vehicle while retaining only a small fraction of that amount as gross profit.
Revenue therefore does not always describe the economic pool available to cover personnel, advertising, occupancy, corporate functions, and other overhead.
Gross profit combines contributions from new vehicles, used vehicles, finance and insurance, parts and service, and other dealership operations. Comparing SG&A with that pool gives a useful view of operating leverage.
Group 1 Automotive reports SG&A expense as a percentage of gross profit as a key operating metric.
Lower is not automatically better
A falling ratio can indicate good cost control, but the denominator can improve for many reasons.
The ratio can fall because gross profit rises faster than overhead, acquisitions add efficient stores, cost reductions lower SG&A, vehicle margins recover, or high-margin F&I and service mix strengthens.
It can rise even with disciplined spending if vehicle gross profit compresses sharply.
Gross-profit mix matters
Two dealer groups with similar revenue can show different SG&A ratios if one earns a larger share of gross profit from aftersales or F&I.
For example, stronger Parts-and-Service Gross Margin can expand the gross-profit denominator even if SG&A dollars are stable.
Likewise, falling new-vehicle GP per unit can pressure the ratio without a large increase in overhead.
Adjusted versions need scrutiny
Some companies publish both reported and adjusted SG&A as a percentage of gross profit.
Adjusted figures may exclude acquisition costs, restructuring, impairments, legal items, or other company-defined expenses. They can be useful, but investors should reconcile the exclusions and keep definitions consistent across periods.
Same-store versus consolidated efficiency
Acquisitions can change both SG&A and gross profit.
A same-store ratio can isolate efficiency at the existing dealership base. A consolidated ratio captures the full corporate result.
Neither is inherently superior. They answer different questions.
Primary-source examples
- Group 1 Automotive second-quarter 2026 earnings release
- AutoNation second-quarter 2026 earnings release
For dealership analysis, this ratio is best read after understanding what drove gross profit: vehicle units, per-unit margins, F&I, and aftersales.
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