Automotive CAC: adding $3,192 incentives to the $739 ad cost

0:05Host:MBA Training. Ten minutes on $3,192 a car in incentives is missing from your automotive CAC.

0:11Expert:Picture a conference room in a dealer group's head office, Tuesday morning. The marketing director has a slide that says cost per sale: seven hundred thirty-nine dollars. The CFO leans over and asks where the rebates are. Silence. Nobody in that room had ever put the hood money and the media money on the same page.

0:31Host:And that silence is this episode. The article we're working from is titled "$3,192 a car in incentives is missing from your automotive CAC." CAC is customer acquisition cost, what you spend to win one buyer. My guest is a chief marketing officer who has sat in that room more than once. Let's start with the seven-thirty-nine. Where does it come from?

0:51Expert:NADA, the National Automobile Dealers Association. Their average dealer spent $739 on advertising for each new vehicle sold last year. It's a clean number and easy to benchmark, which is exactly why everybody quotes it. It's also wrong by a factor of about five.

1:08Host:That's a big claim.

1:10Expert:Cox Automotive reports incentive spending of $3,192 per vehicle in July 2026. That's 6.4% of ATP, the average transaction price, what people actually pay. Quick caveat: Cox owns Autotrader and Kelley Blue Book and sells to dealers, so they have a stake in the channel. Still, incentives come out to more than four times dealer advertising per unit, and almost no marketing deck includes them.

1:39Host:Why not? Nobody's hiding rebates.

1:41Expert:They aren't hidden, they're just scattered. The OEM, the original equipment manufacturer, meaning Ford or Toyota, books incentives as contra-revenue, a deduction from sales rather than a marketing expense. The incentive budget belongs to sales and finance. The OEM's CMO, the chief marketing officer, runs national media. The dealer group CMO sees advertising per unit. Each person optimizes their own slice, and nobody adds them up.

2:13Host:Zoom out for me. Strip away cars. What's the principle?

2:17Expert:Every dollar the value chain spends to win a sale gets counted once, on the ledger of whoever actually pays it, and divided by the sales those dollars caused. That holds whether you sell trucks or software. The best operators learned it the hard way: a cost doesn't become free because it sits in somebody else's department.

2:36Host:Fine, but car margins have been fat for years. Does a fuzzy number really hurt anyone?

2:41Expert:Those years are over. Dealer benchmarking across more than 4,000 franchised stores shows new-vehicle gross profit down 13.5% year over year to $1,840 per unit in Q2 2026, the second quarter. Sonic Automotive's 10-Q, their quarterly filing with the SEC, the Securities and Exchange Commission, shows retail new gross per unit down $559, or 16%, to $2,872. When front-end profit is that thin, a misallocated acquisition dollar comes straight out of net.

3:18Host:Let's get into the mechanics. Co-op first, and define it.

3:22Expert:Co-op is cooperative advertising money. The OEM accrues a fund per vehicle sold, and the dealer usually has to match it. That description comes from Brandmovers, an agency that designs these programs. Stackmatix, which sells co-op management, claims co-op can cover 50 to 100% of digital spend on new-vehicle campaigns. They sell the service, so check that against your own reimbursement history before you believe it.

3:49Host:And where does the counting go wrong?

3:51Expert:In two opposite directions. The dealer reports gross advertising, the OEM reports the co-op payout as marketing, and the same dollar shows up twice. Or the dealer reports net, the OEM files co-op under "dealer programs," and the dollar disappears. The fix is boring. Dealer advertising goes in net of reimbursement, and co-op sits on the OEM marketing line.

4:15Host:Boring fixes rarely get done. Is there pressure to do this one now?

4:19Expert:Yossi Levi, founder of Car Dealership Guy, predicts dealers will start opting out of OEM co-op "en masse" over the next two years. If he's right, spend migrates from the OEM line to the dealer line. Total acquisition cost doesn't move, but every siloed report will show a story. Only the fully loaded view shows that nothing actually changed.

4:42Host:Portals. Cars.com, CarGurus, TrueCar. Add them on top?

4:47Expert:Usually no, and that's the most common double count I see. Third-party websites are about 20% of NADA's dealer budget, so roughly $148 of the $739 already goes to portals. Subscriptions sit inside advertising: Cars.com reports monthly average revenue per dealer of $2,500, and CarGurus reports quarterly average revenue per subscribing dealer of $8,134. Both numbers come from the vendors' own filings. TrueCar is different. It charges a fee per car sold, and stores often book that as a cost of sale, outside advertising. Go find those fees and add them in.

5:30Host:There's a shift hiding in the Cars.com numbers, isn't there?

5:34Expert:OEM and national revenue fell 18% to $13.6 million in Q2 2026, while revenue per dealer rose 3%. Manufacturers are pulling back from portals and dealers are paying more. A model that only covers the OEM side records that as a saving, when the cost has just moved to another ledger.

5:56Host:Floorplan. My listeners' eyes are glazing over already.

5:59Expert:Then keep it short. Floorplan is the loan dealers use to carry inventory, often from the captive lender, Ford Motor Credit, GM Financial, Toyota Financial Services. OEMs pay much of the interest back as floorplan assistance. Group 1 Automotive had $23.3 million of floorplan interest in Q1 2026, less $20.1 million of assistance, for a net of $3.2 million. AutoNation books assistance inside new-vehicle gross profit. My rule is to leave it out of CAC, because it pays for inventory, not customers.

6:38Host:Always?

6:39Expert:Unless it funds a discount. If a store passes a free-flooring period through as a price cut, or an aged-unit cash program fires to clear the lot, that money is buying a customer, and it goes in.

6:51Host:Walk me through one store, with real arithmetic.

6:54Expert:It's a hypothetical, using sourced averages plus a made-up co-op rate and test result. Take 100 retail units. Advertising at $739 comes to $73,900. Say 30% is reimbursed by co-op: $22,170 goes to the OEM line, and the dealer's net is $51,730. Incentives at $3,192 come to $319,200. The wrong method double-counts co-op and shows media at $961 a unit. Counted once, media is $739. Fully loaded blended CAC is $3,931 a unit.

7:39Host:Which makes marketing look five times more expensive. Thanks for that.

7:43Expert:It gets worse before it gets useful. Suppose a holdout test, where you withhold the incentive in a comparable region, shows the incentive caused only 15 of those 100 sales. Its cost per incremental sale is $319,200 divided by 15, or $21,280. Set that against $1,840 of new gross plus F&I, finance and insurance income, at an all-time high of $1,769, about $3,609 per unit. That incentive only pays back through service, repurchase, or inventory relief. If search can buy an incremental sale for less, the next dollar should go to search.

8:28Host:That's where it gets uncomfortable. Hand a CFO $3,931 and they'll cut your media budget first.

8:36Expert:That's the real political risk, so never show the blended number without the incremental one next to it. There are other traps too. Holdouts are noisy, so present a range. Some rebates simply offset a tariff-driven MSRP increase, MSRP being the manufacturer's suggested retail price. That's pricing, not marketing. And in March 2026 the FTC, the Federal Trade Commission, sent warning letters to 97 dealer groups, so incentive-led ads carry legal exposure no CAC figure captures.

9:09Host:Does the store GM need any of this for weekly decisions?

9:12Expert:No, it's too slow for that. Week to week, you want clean cost per car sold. Frank Esparza at Tracy Honda used GA4, Google Analytics 4, along with UTM tags, the tracking codes on links, and found budget they couldn't tie to any sale. That's the right level of rigor for weekly pacing. Fully loaded CAC is for the big calls: the annual split between incentives and media, EV launches where electric-vehicle incentives hit 12% of ATP in August, staying in co-op, and portal renewals.

9:46Host:And if incentive discipline cracks?

9:48Expert:Cox's senior economist noted that before covid, in the 17-million-unit sales years, incentives were around 10 or 11% of transaction price. Tariffs forced restraint. If that restraint weakens, incentives become the fastest-growing acquisition cost in the business, and a CMO still quoting $739 won't even see it coming.

10:11Host:Give me one thing to do on Monday.

10:13Expert:Ask finance for last quarter's incentive spend by nameplate and region, booked as contra-revenue, and put it on one page next to your media spend. Just one page, both numbers. The argument about where the next dollar goes starts from there.

10:27Host:Sources: Insideradio, Cox Automotive Inc. and Digitaldealer. Every link is in the show notes. Done for today. There's a new CMO piece every morning at mba-training.com.