# Calculating 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 → across dealer and digital channels
A dealer principal in Ohio once told his 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 → the online leads were "basically free" while the newspaper ads were bleeding money. Six months of clean allocation later, the truth flipped: each online sale cost around $600 to acquire, while each showroom walk-in that closed cost closer to $1,400 once you loaded in the fixed showroom overhead attributable to marketing. Same dealership, wildly different economics, and nobody had done the math.
That math is 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 →, or 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 →: the total marketing and sales spend required to produce one paying customer. In 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 deceptively hard because a single sale gets touched by digital ads, a third-party lead, a co-op campaign, and a salesperson on the floor. This lesson shows you how to allocate those costs honestly.
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 → includes the money you spend to attract and convert a buyer. Nothing else.
Include:
Exclude:
Co-op advertising is the shared ad spend where a manufacturer (the OEM, or original equipment manufacturer, like Toyota or Ford) reimburses the dealer for part of a campaign. Crucially, only the dealer's net out-of-pocket portion belongs in that dealer's 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 →. If a $10,000 campaign is 50% co-op reimbursed, the dealer's 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 → math uses $5,000.
$$\text{CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →} = \frac{\text{Total acquisition spend for a channel}}{\text{Number of sales attributed to that channel}}$$
Simple to write, hard to populate. The two challenges are: allocating shared costs, and attributing sales to a channel.
Start with a clean monthly spend table. Direct costs are easy. The hard part is shared cost like the showroom itself.
Floor traffic (walk-ins) is not free. The salaried greeter, the sales floor lighting and space, the manager who works a deal: a portion of that is an 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 → for walk-in buyers. A common, defensible method is to allocate the marketing-attributable share of sales-floor labor and facility cost to the walk-in channel, because that channel is what the physical showroom exists to convert.
A buyer who clicked a Google ad, then walked in, is not purely a walk-in. This is the attributionattributionA framework for assigning credit to the touchpoints that contributed to a conversion, so you can measure which channels and interactions actually drive results.View full definition → problem. Two practical models:
For 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 → comparison, many dealers use lead-source attribution: whichever channel produced the identifiable lead (a form fill, a phone call tracked to an ad, a marketplace handoff) gets the sale. Walk-ins with no prior tracked touch are counted as pure showroom.
If you want a primer on attributionattributionA framework for assigning credit to the touchpoints that contributed to a conversion, so you can measure which channels and interactions actually drive results.View full definition → logic before going deeper, Google's free explainer on attribution models in Analytics is a clean starting point.
Take a single mid-size US franchise dealer in one month. These are illustrative figures for teaching, not benchmark data.
Digital channel:
$$\text{Digital CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →} = \frac{30{,}000}{50} = \$600 \text{ per sale}$$
Showroom / walk-in channel:
$$\text{Showroom CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →} = \frac{42{,}000}{30} = \$1{,}400 \text{ per sale}$$
Now the dealer principal's instinct is upended. Digital looks cheaper per sale. But do not stop here, because 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 → alone can mislead.
A $1,400 walk-in buyer who buys a loaded trim, finances through the dealer, and returns for service for five years may be worth far more than a $600 online price-shopper who bought the base model and never comes back.
This is why 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 → must be read against customer lifetime value (LTV): the total gross profit a customer generates over their relationship, including repeat purchases and service. The health ratio marketers watch is LTV to CAC. In many consumer industries a ratio of roughly 3:1 is treated as a rough rule of thumb for a healthy business, though automotive varies widely because service and repeat-buy cycles are long (buyers often replace a vehicle every 6 to 8 years, per commonly cited industry estimates).
For a dealer, service retention is often where LTVLTVLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition → is really made. A cheap-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 → online buyer who never books service can be worth less than an expensive walk-in who does.
Precise, universal 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 → benchmarks are hard to pin down because reporting varies by brand, region, and whether the vehicle is new or used. Treat all of the following as directional estimates, not audited figures, and verify against your own numbers.
The takeaway: do not import a benchmark blindly. Compute your own close rate first, because a 6% versus 10% close rate changes digital 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 → by nearly double.
Knowledge check
1. The Ohio dealership example, where online sales turned out to cost less to acquire than showroom walk-ins, primarily illustrates which principle about CAC?
2. Why does the cost of the vehicle itself get excluded from CAC?
3. A $20,000 co-op campaign is 40% reimbursed by the OEM. What amount belongs in the dealer's CAC calculation, and why?
4. Select ALL correct answers. Which of the following should be INCLUDED in a dealership's customer acquisition cost?
Select all the correct answers.
5. Select ALL correct answers. What makes CAC 'deceptively hard' to calculate in automotive retail?
Select all the correct answers.
Counting gross leads, not net sales. Cost-per-lead flatters digital. Always divide by actual sales.
Ignoring co-op reimbursement. Using gross campaign cost overstates dealer 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 →. Use the net out-of-pocket figure.
Treating the showroom as free. Walk-ins consume real, allocable marketing and sales-floor cost. Zeroing that out makes digital look artificially expensive by comparison and hides the true trade-off.
Double-counting cross-channel buyers. Pick one attribution modelattribution modelA framework for assigning credit to the touchpoints that contributed to a conversion, so you can measure which channels and interactions actually drive results.View full definition → and apply it consistently. Inconsistency is worse than an imperfect model.
Blending new and used. Used-vehicle acquisition economics and margins differ sharply from new. Segment them.
Once you trust the numbers, 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 → drives real choices:
The goal is not the lowest 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 →. It is the best spread between what a customer costs to acquire and what they are worth.