$3,192 a car in incentives is missing from your automotive CAC

Ask an automotive marketer what it costs to acquire a new-car buyer and you will usually get one number. According to NADA, the average dealer spent $739 on advertising for each new vehicle sold last year. The number is clean and easy to benchmark. It also understates true customer acquisition costcustomer acquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → several times over, because most of the money spent to win a car buyer never reaches the advertising line. Cox Automotive (which owns Autotrader and Kelley Blue Book and sells to dealers, so it has a stake in the channel) reports that incentive spending fell to $3,192 per vehicle, or 6.4% of ATP in July 2026. That money sits in contra-revenue at the OEM. Floorplan assistance is booked inside new-vehicle gross. Depending on whose ledger you read, OEM co-op is counted twice or not at all.

The thesis of this piece: true automotive CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → is every dollar the value chain spends to win a retail sale, counted once on the ledger of whoever pays it, and divided by the sales those dollars actually caused. Calculated that way, incentives are the biggest acquisition costacquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → in most franchises. The most important allocation decision a CMO influences is how much goes on the hood versus into media, and a CAC that stops at $739 can't inform that decision.

Why dealer cost per sale misleads automotive CMOs

Every budget owner sees one slice. The OEM CMO runs national and regional media and usually writes the co-op guidelines. The incentive budget belongs to sales and finance. The dealer group CMO sees advertising per unit. Nobody adds the slices together, so each one gets optimized on its own.

Look at the scale. According to NADA data reported by Inside Radio, the average dealership advertising spendadvertising spendAny media you pay for: display ads, search ads, social ads, and sponsorships. You buy access to someone else's audience on a per-click, per-impression, or flat-fee basis.View full definition → in 2025 was $586,246, up 7.8% over 2024, and the largest shares of the 2025 advertising budget were allocated to search engine marketingsearch engine marketingSearch Engine Marketing: reaching audiences through search engines, combining organic SEO and paid search (SEA) to capture user intent at the moment of search.View full definition → (21.1%), third-party websites (20.0%), and search engine optimizationsearch engine optimizationSearch Engine Optimization: the practice of improving your pages' natural (unpaid) rankings in search engine results pages to attract more organic traffic.View full definition → (19.5%). At $3,192 per unit, incentives are more than four times dealer advertising per unit.

Margins make the gap expensive. Dealer benchmarking data covering more than 4,000 franchised stores shows new vehicle gross profit fell 13.5% year-over-year to $1,840 per unit in Q2 2026. Sonic Automotive's 10-Q says retail new vehicle gross profit per unit decreased $559, or 16%, to $2,872 per unit in the same quarter. With front-end gross that thin, every misallocated acquisition dollar comes straight out of net profit.

Costs are also moving between parties. In Q2 2026, Cars.com reported OEM and National revenue of $13.6 million was down 18% year-over-year, while Monthly Average Revenue Per Dealer increased to $2,500 (up 3% year-over-year). OEMs are pulling back from portal advertising and dealers are paying more for marketplace exposure. A CAC model that only covers the OEM side records that shift as a saving.

The incentive line could also grow quickly. Cox's senior economist noted that prior to covid, during the 17+ million sales years, incentives were closer to 10 or 11% of the transaction price. Today's restraint reflects the fact that in the wake of tariffs, and their squeeze on profitability, it appears that more pricing discipline is the new path forward. If that discipline weakens, incentives become the fastest-growing acquisition cost in the business.

How do you load co-op, incentives and floorplan into automotive CAC?

Put each cost on the ledger of the party that ultimately pays it, remove reimbursements so nothing is counted twice, and keep money that wins customers separate from money that carries inventory. Four cost streams need specific treatment.

Co-op: count it once, at the OEM

According to Brandmovers, an agency that designs dealer incentive programs, a typical program works like this: the OEM commits a per-vehicle co-op fund accrual for each vehicle sold, and most programs require a dealer matching contribution. Stackmatix, an agency that sells co-op management, claims co-op can cover 50 to 100% of your digital ad spend on new vehicle campaigns. That is a vendor estimate, so check it against your own reimbursement history.

The trap is in the reporting. If the dealer reports gross advertising and the OEM also reports co-op payouts as marketing, the same dollar appears twice. If the dealer reports net spend and the OEM files co-op under "dealer programs," the dollar disappears. The fix is to count dealer advertising net of reimbursement and put co-op on the OEM marketing line.

This matters more now. Car Dealership Guy founder Yossi Levi predicts dealers will begin opting out of OEM co-op programs "en masse" during the next two years. If he is right, spend moves from the OEM line to the dealer line and total acquisition cost stays the same. Only a fully loaded view shows that nothing actually changed.

Lead-vendor fees: check whether they are already in the $739

Third-party websites make up 20% of NADA's dealer budget, so roughly $148 of the $739 already goes to portals. Subscriptions such as Cars.com's $2,500 monthly ARPD and CarGurus' U.S. QARSD of $8,134 per quarter (both figures from the vendors' own filings) sit inside advertising. Adding them again is the most common double count in dealer CAC decks. Per-sale fees work differently. TrueCar charges each participating dealer a fee for every car sold through TrueCar, and stores often book that fee as a selling expense or cost of sale, outside advertising. Find those fees and add them.

Incentives: load all of it, then divide by what it caused

Incentive intensity varies widely by segment. In July, Cox found spending elevated in many of the best-selling segmentssegmentsDividing a market into distinct groups of customers who share similar needs, characteristics or behaviours, so each group can be served with a tailored approach.View full definition →, including full-size pickup trucks (8.6%), compact SUVs (7.8%) and mid-size SUVs (6.8%). For EVs, EV incentive spending averaged 12% of ATP in August. For the P&L view, divide all incentive dollars by all units. To choose between levers, divide by the units the incentive caused. That requiresmeasuring which incentive dollars are incremental, usually through regional holdouts or matched-market tests.

Floorplan support: inventory money until it funds a discount

When a new vehicle arrives, the floorplan lender (often the manufacturer's captive finance company, Ford Motor Credit, GMGMGross margin is the share of revenue left after subtracting the direct cost of producing goods or services, expressed as a percentage of revenue.View full definition → Financial, Toyota Financial Services, or a bank) pays the manufacturer, and the dealership owes the floorplan lender. OEMs then pay much of that interest back. In the first quarter of 2026, Group 1 Automotive reported floorplan interest expense of $23.3 million, less floorplan assistance of $20.1 million, for net floorplan expense of $3.2 million. AutoNation explains that floorplan assistance is based on a percentage of the manufacturer's suggested retail price or a flat rate per vehicle and is accounted for as a component of new vehicle gross profit. It reported $33.9 million of assistance against $42.0 million of interest in Q2 2026.

By default, floorplan assistance is a margin transfer through wholesale pricing, and it pays for inventory, not customers. Leave it out of CAC. Add it in only when a store passes assistance or a free-flooring period through as a price cut, or when an aged-unit cash program kicks in to clear a lot. Understandinghow floorplan assistance flows through dealer gross tells you which of those situations you're in.

A worked example on 100 retail units

The example below is hypothetical and arithmetic only. It uses sourced per-unit averages and an invented co-op rate and test result.

• Dealer advertising at NADA's average: 100 × $739 = $73,900.
• Assume 30% is reimbursed through co-op: $22,170 goes on the OEM line and the dealer's net spend is $51,730.
• Incentives at Cox's July average: 100 × $3,192 = $319,200.

Wrong method: the dealer reports $73,900 and the OEM also reports $22,170, so media looks like $961 per unit. Counted once, media is $739 per unit. Fully loaded blended CAC is ($73,900 + $319,200) ÷ 100 = $3,931 per unit.

Now suppose a holdout test shows the incentive caused 15 of the 100 sales. The incentive's cost per incremental sale is $319,200 ÷ 15 = $21,280. Compare that with $1,840 of new-vehicle gross plus finance and insurance income at an all-time high of $1,769 per vehicle retailed, about $3,609 per unit. On those numbers, the incentive only pays back through service and repurchase value, or through inventory relief. If search or portals can buy an incremental sale for less, the next dollar should go there.

The rule for the whiteboard

Count every dollar once, on the ledger that pays it. Report blended CAC as all dollars over all units. Compare levers using each lever's dollars over the incremental units it caused. Floorplan money stays out until it funds a discount.

When fully loaded automotive CAC helps and when it misleads

Use it for the big allocation calls: the annual split between incentives and media, EV launch budgets where incentives run at nearly double the industry rate, decisions on whether to stay in co-op, and portal contract renewals. Those are the decisions where a $739 frame and a $3,931 frame lead to different answers.

It misleads in four situations.

First, incrementalityincrementalityThe share of results (sales, conversions, revenue) that only happened because of a marketing action, not what would have occurred anyway.View full definition → estimates are noisy. A single holdout in one region can be off by a lot, so present a range and avoid quoting false precision.

Second, it is too slow for store-level pacing. Monthly management needs cost per car sold, tracked properly. At Tracy Honda, general manager Frank Esparza found a certain amount of budget on marketing that we really can't attribute to a sale by checking GA4 and UTM data. That is the right level of rigor for weekly decisions.

Third, some "incentives" are really price corrections. Cox notes that automakers beginning to pass along tariff costs should not be underestimated. A rebate that only offsets a tariff-driven MSRP increase belongs to pricing, and loading it into CAC makes marketing look worse without helping any decision.

Fourth, there are politics and compliance. A finance team handed $3,931 without the incremental view may cut media first. On compliance, in March 2026, the FTC sent warning letters to 97 dealer groups, so incentive-led advertising carries legal exposure that a CAC figure doesn't capture.

What to do on monday

• Ask finance for last quarter's incentive spend by nameplate and region, booked as contra-revenue, and put it next to your media spend on one page.
• Pull co-op payouts from the OEM ledger and compare them with what your top dealer groups report as gross advertising. If both include the reimbursement, you have found your double count.
• Check where TrueCar and other per-sale lead fees are booked in your largest stores' financial statements, and move them into CAC if they sit outside advertising.
• Split floorplan assistance into "carried inventory" and "funded a discount," using aged-unit and stair-step program data from the last two quarters.
• Pick one incentive program and propose a two-region holdout for next month, so your next allocation meeting has an incremental number.

Most automotive CAC decks get two things wrong: they include co-op twice and incentives not at all. Fixing both usually moves the per-unit figure from a few hundred dollars to a few thousand. With that number, you can argue for where the next dollar of acquisition money should go.

The full course on this sector:Marketing in Automotive.