A discount in an ad shown in ChatGPT may make a purchase more attractive, but it also reduces the amount available to pay for that advertisement. Before launching the offer, the question is not simply whether it could produce more orders. Establish how much contribution each discounted order loses and what outcome would be needed to recover that loss.
This article addresses the economics of a discounted offer promoted through paid placements in ChatGPT. The calculations are editorial decision methods. Their hypothetical inputs illustrate relationships, not prices, forecasts or measured campaign results. Start with the same product and fulfillment arrangement to isolate the price reduction.
Use the final customer price
Begin with revenue after the discount that actually applies at checkout. Specify whether the offer reduces one item’s price, applies a code across the order or creates a bundle price. If discounts can be combined, calculate the final price rather than relying on the percentage displayed in the advertisement.
Use one currency and consistent tax treatment for revenue, variable costs and advertising. The example uses SEK excluding VAT. An unused code is not a revenue deduction in an actual order report. A planning worksheet should nevertheless specify which orders are assumed to redeem the offer and which pay the regular price.
A discount primarily removes revenue. The purchase cost of the same product and the work required to pack it do not automatically fall. Some expenses, such as a percentage-based payment fee, may decrease with the selling price. Recalculate those particular items from the agreement rather than reducing every cost by the discount percentage.
Follow one order through the price change
Consider a hypothetical order without refunds. Regular net revenue is SEK 1,200 and relevant variable costs are SEK 720. Contribution before advertising is SEK 480. A 20% discount removes SEK 240 of revenue, leaving SEK 960. In this example, variable costs remain SEK 720.
Discounted contribution is therefore 960 − 720 = SEK 240. A 20% price reduction has halved contribution before advertising. The reduction applies to total revenue, while the original contribution was only part of that revenue. Reducing the previous CPA limit by 20% would give the wrong answer.
At break-even within this calculation, the advertising allowance falls from SEK 480 to SEK 240 per order. If the business wants to retain SEK 100 for fixed costs and profit, an internal working target becomes SEK 380 before the discount and SEK 140 afterward. The break-even CPA guide explains the distinction between the zero point and a target that retains contribution.
Contribution margin also changes: 480 / 1,200 = 40% before the discount and 240 / 960 = 25% afterward. The corresponding break-even ROAS threshold rises from 2.50 to 4.00 times. Revenue in the margin calculation and the ROAS numerator must share the same net basis. The margin-based ROAS calculation develops that relationship further.
Name the contribution that additional orders must replace
Suppose 100 regular-price orders contribute 100 × 480 = SEK 48,000 before advertising. Matching that amount at SEK 240 per discounted order requires 200 orders. Volume must double to preserve contribution before media cost, with all other assumptions unchanged.
A campaign decision also requires the cost of acquiring those orders. Assume hypothetically that CPA is SEK 160 in both cases. A regular order then retains SEK 320 after advertising; a discounted order retains SEK 80. The original 100 orders produce SEK 32,000. Matching that contribution after advertising now requires 400 discounted orders.
The second comparison assumes advertising cost grows with order count at an unchanged CPA. It is not a fixed-total-budget comparison or a promise that four times the volume can be acquired. With a fixed advertising budget, reassess both achievable volume and the CPA that volume implies. State the assumption behind every required-volume figure.
A 20% discount can halve order contribution
- Regular price: SEK 1,200
SEK 480 before ads, SEK 320 after CPA. Break-even ROAS: 2.50 times.
- Discounted price: SEK 960
SEK 240 before ads, SEK 80 after CPA. Break-even ROAS: 4.00 times.
- Same contribution before ads
100 regular orders contribute SEK 48,000. Matching this requires 200 discounted orders.
- Same contribution after ads
100 regular orders contribute SEK 32,000. At the same CPA, matching this requires 400 discounted orders.
Follow the offers customers actually buy
Visitors from a ChatGPT ad may purchase at the regular price, choose a different product or add other items to their baskets. Calculate campaign contribution from the order mix being evaluated. Neither the store-wide average nor the advertised product’s margin necessarily represents those purchases.
Using the example’s costs, 60 discounted orders and 40 regular orders contribute 60 × 240 + 40 × 480 = SEK 33,600 before advertising. Average contribution is SEK 336 per order. This works because the product and other costs remain identical. Different products require a complete calculation for each group.
If the offer also includes free shipping, treat the lost customer shipping payment and delivery cost separately. The shipping subsidy calculation explains how to avoid counting customer payments twice. A merchandise discount should not conceal an additional delivery concession.
Reconcile purchase values and later refunds
OpenAI Reporting describes ROAS as attributed purchase value divided by spend. Check whether your reported purchase values represent the discounted final price. OpenAI Conversion Tracking documents the event setup; your own order records must still substantiate the revenue definition.
Allow relevant returns to mature or show an explicit estimate. Adjust refunded revenue and costs that actually remain, accounting for recovered goods. Do not assume discounts automatically increase returns. Attributed purchases and observed differences also do not prove that the offer caused equivalent additional sales or profit.
OpenAI Bidding & Budgets documents bidding and budget concepts. The calculated CPA and ROAS thresholds are internal decision conditions. Retain them with the final price, discount rules, order mix and cost evidence, and revise the worksheet when the offer changes. The next campaign decision can then use the economics that actually apply.
Sources and scope
Determine how much contribution a discounted ChatGPT offer must recover through lower acquisition cost or additional purchases.
Working methods and examples are editorial suggestions. Check current platform requirements and available features before implementation.