Car Care Products Customer Acquisition Cost in New Zealand: What You Can Afford

Define the customer and the cost before calculating

Customer acquisition cost (CAC) is the amount spent to acquire one new customer: acquisition spend divided by the number of first-time customers acquired in the same period. The denominator is a customer, not an order. If one buyer places an initial $120 order and a second $60 order, that is two orders but one newly acquired customer. Count a customer when their first order is delivered, rather than counting cancelled or returned orders as realised revenue.

Use one definition consistently when comparing measures. Blended CAC is useful for deciding whether the store’s overall acquisition effort is affordable. Channel CAC, such as Meta spend divided by new customers attributed to Meta, is useful for reviewing a channel, but attribution can omit customers influenced by other channels or misassign credit. MER and attributed ROAS are not CAC: they compare spend with revenue, so they are useful for checking efficiency at store or channel level, not for setting the cost of acquiring one customer. Keep GST treatment consistent; GST in New Zealand is charged at a rate of 15% (Inland Revenue (Te Tari Taake), GST). A CAC calculator can help keep the denominator and comparison period explicit (Source: Inland Revenue (Te Tari Taake)).

What belongs in acquisition cost

Include every incremental cost used to win a first-time buyer during the period: Meta, Google, TikTok and other paid media; the ad platform’s charges; campaign-specific creative, photography and video; and agency or freelancer fees for acquisition work. Include acquisition-focused software or platform fees where they can be separated reliably. If a promotion was offered specifically to secure the first order, include its funded cost once, such as a $10 welcome discount or a free-gift cost, but do not also treat the same amount as a media expense.

Keep the accounting basis consistent. GST in New Zealand is charged at a rate of 15% (Inland Revenue (Te Tari Taake), GST); a GST-registered store will normally compare ex-GST costs with ex-GST revenue, while a store that cannot recover GST should use the amount it actually pays. Use the same treatment in an CAC calculator (Source: Inland Revenue (Te Tari Taake)).

• Exclude product cost, packaging, pick-and-pack, freight, delivery subsidies, payment fees, refunds and returns from acquisition spend. These belong in order economics and reduce the profit available to support CAC.
• Exclude email, SMS, loyalty, customer service and other retention costs when measuring new-customer acquisition. Allocate shared costs only when there is a defensible method; otherwise report them separately rather than creating false precision.
• Do not count cancelled or returned orders as acquired customers. Match spend to first-time customers and define whether agency retainers, creative production and promotions are allocated by campaign, channel or period.

First-order margin is the first ceiling

First-order margin sets the hard ceiling for profitable acquisition. Calculate it as: realized first-order revenue − product cost − payment fees − packaging − shipping and fulfilment − other variable order costs. The result is the maximum CAC at which that order breaks even before acquisition spend. If the margin is NZ$24 and CAC is NZ$30, the first order loses NZ$6; if CAC is NZ$18, it contributes NZ$6 after advertising. Use delivered-order revenue, not cancelled or returned orders. For a GST-registered store, keep the calculation consistent by using GST-exclusive figures where GST is recoverable. Inland Revenue states that “GST in New Zealand is charged at a rate of 15%.” (Source: Inland Revenue (Te Tari Taake)).

This measure is the right one for setting a launch or scaling guardrail: it tells you how much acquisition spend the first transaction can carry without relying on future behaviour. Compare actual CAC with this ceiling by product or collection, because a high-margin detailing kit can support more spend than a low-margin refill. The CAC calculator can structure the calculation; ORVX can compute product costs and show contribution after advertising by product and collection. First-order margin is not the same as overall business profit: overhead, inventory costs and later customer activity require separate measures.

Repeat orders change the allowable limit

A repeat order can raise the CAC you can afford, but only by its expected contribution, not by its revenue. Start with the first order’s contribution, then add the contribution from later purchases that are likely to occur within your measurement period. Subtract product cost, payment fees, packaging, discounts and any incremental cost used to generate the repeat order, such as email, SMS or retargeting spend.

For illustration only, suppose the first order contributes $18 after variable costs. If 60% of acquired customers place a second order within 90 days, that order contributes $22 after product and fulfilment costs, and costs $3 to generate, expected repeat contribution is 0.60 × ($22 − $3) = $11.40. The implied acquisition limit is therefore $29.40, before fixed overhead and tax. The timing matters: contribution received in 90 days cannot support the same cash position as contribution received next week.

Retention must be measured by cohort, not assumed from a single loyal customer. Compare CAC with contribution from customers who actually reorder, at a defined interval, and include the cost of producing those orders. Customer-level profitability and repeat behaviour make this visible; the CAC calculator can model the limit, while your store data should validate retention and timing.

Read the worked example as a decision rule

Use the worked example as a decision rule, not as a target copied from another store. First identify which allowable CAC the example is testing: the first-order limit, or the limit that includes expected repeat contribution. Then compare that limit with your store’s actual CAC for the same period, customer definition and currency.

The comparison determines the next question. If actual CAC is below the relevant allowable CAC, acquisition is economically viable under those assumptions; check whether the result still holds by product and collection. If actual CAC is above it, do not use repeat revenue without checking whether it is supported by observed behaviour. Recheck realised revenue, costs, attribution and repeat behaviour, then decide whether to reduce acquisition cost, improve first-order economics or stop the affected activity. A gap is not a reason to raise prices or ad spend automatically. Run your own inputs through the CAC calculator and keep first-order and repeat-inclusive limits visible as separate measures.

• Act on the first-order limit when cash recovery and initial-order profitability are the immediate constraint.
• Act on the repeat-inclusive limit only when observed repeat behaviour supports the contribution used in the example.