In this article
- Key takeaways
- Why the same ROAS can become unprofitable
- Build the cost sheet around the order you will actually fulfil
- Calculate a media ceiling, then choose a target below it
- For lead generation, work backwards through the close rate
- Ask whether the promotion created demand or moved it
- Review the promotion after the costs have caught up
- Frequently asked questions
Key takeaways
- A discount reduces revenue while many delivery costs remain. The same ROAS can produce a very different contribution.
- Calculate what remains after variable costs before setting a media-cost ceiling.
- Break-even before fixed costs is not a profit target. Leave room for overhead and the return the business needs.
- Separate attributed revenue, collected revenue and incremental profit when reviewing the promotion.
Why the same ROAS can become unprofitable
A promotion can hit the ROAS target and still leave less money to run the business. The campaign report measures revenue against advertising spend. It does not automatically account for the costs of fulfilling the orders that generated that revenue.
Imagine a $100 product with $40 in product cost and $15 in other variable costs. Before advertising and fixed costs, it contributes $45. Reduce the selling price by 20% while holding those variable costs constant and the contribution falls to $25.
At 3x ROAS, the $80 discounted order carries about $26.67 in media spend. That leaves a loss of roughly $1.67 before fixed costs. These are illustrative figures in one currency, not a client result. They show why the offer and the media target need to be evaluated together.
| Per order | Full price | 20% discount |
|---|---|---|
| Revenue | $100.00 | $80.00 |
| Product cost | $40.00 | $40.00 |
| Other variable costs | $15.00 | $15.00 |
| Contribution before media | $45.00 | $25.00 |
| Media cost at 3x ROAS | $33.33 | $26.67 |
| Contribution after media | $11.67 | -$1.67 |
Hypothetical, rounded to cents. Assumes unchanged variable costs. Excludes fixed costs, taxes and later customer purchases.
Build the cost sheet around the order you will actually fulfil
Start with the price after discount. Add the variable costs the order creates: product, fulfilment, payment processing, shipping subsidy and a reasonable allowance for refunds or returns. Use your actual accounting treatment to avoid counting the same cost twice.
Some costs change with price while others change with volume or product mix. A percentage payment fee may fall with the discounted price; delivery usually does not fall by the same percentage. The simple example above holds costs constant to make the mechanism visible, not to replace a real cost model.
For a service, translate the exercise into delivery time and capacity. Include the additional labour or contractor cost needed to serve the booked customer. If a discounted job occupies capacity that could have been sold at full price, consider that tradeoff before treating every extra booking as growth.
Calculate a media ceiling, then choose a target below it
In the discounted example, $25 is the contribution before media. Spending all $25 on acquisition leaves nothing for fixed costs or profit. Dividing $80 revenue by $25 gives a 3.2x media ROAS break-even point before those other obligations.
If the business instead needs $10 of contribution after media from each order, the illustrative media ceiling becomes $15. At $80 of revenue, that implies a ROAS of about 5.33x. This is arithmetic under stated assumptions, not a recommended target for every advertiser.
An account target is also not a guarantee that every order or campaign will meet it. Set the test budget with room for variation and decide which evidence would justify continuing. If the economics require an efficiency the campaign has never approached, reconsider the offer before increasing spend.
For lead generation, work backwards through the close rate
A service business often pays for an inquiry before it knows whether that inquiry will buy. Translate an affordable customer acquisition cost into an approximate lead-cost ceiling using a mature lead-to-customer rate.
For example, a hypothetical $200 ad-spend ceiling per new customer and a 10% lead-to-customer rate imply a $20 CPL ceiling. If the promotion changes the audience and the rate falls to 5%, that same $20 CPL now produces $400 of ad spend per customer.
Use comparable cohorts and allow time for sales outcomes. Do not combine today’s discounted inquiries with an old full-price close rate and call the forecast established. Track the rate the promotion actually produces and keep the estimate conditional until enough outcomes mature.
Ask whether the promotion created demand or moved it
Reported revenue can include people who already planned to buy. Some customers may move a purchase forward to use the discount. Others may discover the business because of the promotion. A standard attributed ROAS figure does not separate those effects.
The 2014 eBay paid-search field experiments illustrate how strongly purchase intent can distort non-experimental advertising estimates. That work involved a large marketplace with substantial existing demand, so it should not be treated as a forecast for a small service business.
The relevant lesson is to distinguish what the platform credited from what the promotion caused. Keep new-customer, returning-customer and margin views beside attribution. Use a suitably designed experiment if the business needs a causal estimate rather than a reporting comparison.
Review the promotion after the costs have caught up
Keep an early operational report and a later commercial report. The first checks spend, tracking and fulfilment problems. The second reconciles collected revenue, returns, cancellations and acquisition costs after a defined window.
If repeat purchases justify a higher initial acquisition cost, document the cohort evidence and cash-flow requirement. Future customer value can matter, but an optimistic lifetime-value estimate should not hide a promotion the business cannot finance.
A useful promotion review ends with a decision about the offer, product mix or budget. Keep the calculation that explains the decision. Next year’s team will learn more from that record than from a screenshot of an impressive ROAS.
Frequently asked questions
What ROAS should I target for Black Friday?
Calculate it from the discounted price, variable costs and required contribution after media. A target that worked at full price may fail after a discount. No single ROAS target fits every product or business.
How do I calculate break-even ROAS?
For media break-even before fixed costs, divide revenue by contribution before media. With $80 revenue and $25 contribution, the result is 3.2x. Include the costs and profit requirement relevant to your own decision.
Can a promotion lose money initially and still be worthwhile?
Possibly, if credible repeat-purchase or strategic benefits justify the cost and the business can finance it. State those assumptions separately rather than calling the initial order profitable.
