Choose the measure that matches the decision
Customer acquisition cost (CAC) is the average cost of acquiring one new customer: acquisition spend divided by the number of new customers attributed to it. Use CAC to compare what you spent with the customers actually acquired, and to monitor whether acquisition efficiency is changing. It is a reporting measure, not automatically a spending limit.
Allowable CAC is the maximum acquisition cost your store can accept for a defined decision. Use it before launching, scaling or reducing a campaign: if observed CAC is $22 and your allowable CAC is $18, the decision is to reduce, test or stop rather than scale. The allowable figure must match the economic basis you have chosen; it should not be treated as a universal market benchmark. ORVX’s CAC calculator can help structure the calculation.
Payback period asks how long it takes to recover the acquisition cost from the customer’s contribution. Use it when cash timing matters. A campaign can sit below its allowable CAC but still take too long to repay for a cash-constrained store; another may have a longer payback that fits a store’s funding plan. Keep CAC and payback separate: one measures cost per acquired customer, while the other measures recovery time.
| Measure | What it tells you | Use it when deciding |
|---|---|---|
| CAC | Average cost to acquire one new customer | Reviewing acquisition efficiency |
| Allowable CAC | Maximum cost acceptable for the chosen economics | Scaling, reducing or stopping acquisition |
| Payback period | Time needed to recover acquisition cost | Managing cash timing and growth pace |
What belongs in acquisition cost
Set the boundary before calculating baking supplies customer acquisition cost in Australia. Include paid advertising attributable to acquiring first-time customers, plus directly related costs such as campaign management, agency fees and acquisition-specific creative. Keep the same boundary across channels and months; otherwise a Meta CAC that excludes creative is not comparable with a Google CAC that includes it.
Treat agency costs according to how they are charged. Add a campaign-specific fee in full. Allocate a monthly retainer across the campaigns or channels it supports using a documented rule, such as spend share or new-customer share. Allocate shared photography, video and design only when they support acquisition; spread a larger asset over the campaigns or period expected to use it rather than loading the entire invoice into one month.
Customer discounts normally reduce realized revenue, not acquisition cost. If the decision is promotional acquisition cost, report the discount separately or add it as an explicit cost; do not quietly mix the two measures. Exclude product cost, picking, packing, postage, payment fees and returns from CAC. Exclude email, SMS, loyalty and other ongoing retention costs unless the chosen measure is explicitly total customer acquisition and retention cost. Use GST-inclusive or GST-exclusive figures consistently, depending on whether your business can claim the GST.
Worked example with sample numbers
This example is illustrative. It uses sample numbers for a baking supplies store selling in Australia. They are made up to show the method, they are not a benchmark, and your own figures will differ.
Formula: Ceiling = margin per order x orders per customer / target ratio.
| Orders per customer | Margin earned | Ceiling at a 3:1 target |
|---|---|---|
| 1.0 | A$30.30 | A$10.10 |
| 1.5 | A$45.45 | A$15.15 |
| 2.0 | A$60.60 | A$20.20 |
| 3.0 | A$90.91 | A$30.30 |
Run the same sum with your own numbers in the free calculator, or browse guides for sellers in Australia and more baking supplies guides.
General information only: tax, duty and import rules change and depend on your situation, so check with an accountant or the official source before acting.
Eligible Shopify stores can see these numbers for their own store through the Founding 10,000 offer.
Use first-order margin as the hard ceiling
Use first-order contribution as the hard ceiling for acquisition spend. Gross profit is revenue less the product cost. Contribution is what remains after subtracting the order-level costs required to complete that sale, including payment fees, shipping subsidies, packaging and other variable fulfilment costs.
The distinction matters for baking supplies. An order can show a healthy gross margin while leaving little cash to acquire the customer. For example, the calculation is: realised order revenue − product cost = gross profit; gross profit − payment fees − shipping subsidy − other order-level costs = first-order contribution. A first-order CAC above that contribution cannot break even on the first purchase, before fixed overhead.
Use gross margin to assess product pricing and assortment. Use contribution margin to decide how much the first order can fund, and compare that amount with CAC in a CAC calculator. Keep GST separate from trading revenue when relevant: business.gov.au says registered businesses collect the GST portion, one-eleventh of the sale price. That amount is collected for the tax system, not available to fund acquisition. ORVX can show product- and collection-level profitability so the ceiling reflects the items customers actually buy, rather than an average revenue figure.
Let repeat orders expand the allowable limit
A later order can justify a higher acquisition cost, but only when its expected contribution is based on your own cohorts. Define a measurement window, then calculate: allowable CAC = first-order contribution + later-order contribution − the cost of generating those later orders. Include discounts, email or SMS costs, and any retargeting spend used to produce the repeat purchase.
For illustration only, suppose a cohort produces $18 contribution on its first delivered order. Within your chosen window, its observed repeat rate and order data show $6 of later contribution per acquired customer, after product costs and returns. If repeat-purchase activity costs $1 per acquired customer, the cohort supports up to $23 CAC before your required profit buffer. That is not a forecast that every new customer will repeat; it is an allowance tied to the measured cohort.
Timing matters. A repeat contribution received much later may not support the same cash or payback decision as one received soon after acquisition. Recalculate when reorder timing, retention, refund value or repeat-generation costs change. ORVX shows customer-level profitability and repeat behaviour, and reports returns by units and refund value against revenue, so you can base the calculation on delivered orders rather than cancelled or returned sales. Use the CAC calculator to test the assumptions.
First-order margin as a ceiling
Treat first-order contribution as a ceiling, not a target. If a new customer’s first order contributes $36 after product cost, payment fees, pick-and-pack and outbound freight, a $36 CAC is break-even before overhead and profit. A $25 CAC leaves $11 to help cover fixed costs and profit; a $40 CAC loses $4 before any repeat purchase is considered.
Use the same tax basis on both sides. For a GST-registered store pricing a product at $88 including GST, the GST portion is $8, leaving $80 of revenue for the margin calculation. business.gov.au (Australian Government) states that GST is 10% on most goods and services and that registered businesses collect one-eleventh of the sale price. Do not compare a GST-inclusive order value with GST-exclusive product costs (Source: business.gov.au (Australian Government)).
This measure is different from gross margin: gross margin helps assess product economics, while first-order contribution sets the acquisition limit. ROAS shows revenue generated per advertising dollar, but cannot establish whether that revenue covers variable costs. Use the first-order contribution ceiling when deciding whether to scale, reduce or stop a campaign; calculate a store-specific limit with the CAC calculator.
Sources
- Register for goods and services tax (GST) (business.gov.au (Australian Government), checked 26 October 2026).
How this page was made: drafted with AI from a brief, then checked by automated rules for arithmetic, sources and duplication. The sample numbers were calculated, not reported.