How to calculate break-even ROAS with VAT and product costs
The calculator first removes entered sales VAT from revenue, then removes recoverable VAT from each eligible cost. The remaining net revenue minus COGS, shipping, transaction fees, and other per-order costs is the break-even CPA: the most advertising cost the order can absorb before contribution reaches zero.
Use the ROAS conversion-value selector to match the numerator to your ad platform. Choose gross order value when reported conversion value includes VAT, or net sales value when the platform excludes VAT. The calculator keeps the profit model on net revenue in both modes.
Review VAT treatment and break-even assumptions
Break-even ROAS = reported order revenue ÷ break-even CPABreak-even ROAS vs break-even CPA for ecommerce advertising
Break-even ROAS is the minimum revenue multiple an ad campaign must produce. Break-even CPA is the maximum amount the business can pay to acquire one order. They describe the same margin limit from opposite directions and are most useful when monitored together.
A media buyer can compare platform ROAS with the ROAS floor and compare platform CPA with the CPA ceiling. A campaign is below break-even when ROAS is too low, CPA is too high, or both metrics are based on inconsistent revenue attribution.
How product margin changes break-even and target ROAS
Higher non-ad costs leave less contribution available for advertising, so break-even ROAS rises. Improving price, product cost, shipping, fulfillment, return rate, or payment fees can lower the ROAS floor even when media performance does not change.
The 10% and 20% targets shown by the calculator reserve that share of gross order value as profit before calculating the advertising allowance. When the desired profit is larger than the available contribution, the target is marked not feasible instead of returning a misleading negative number.
Which ecommerce costs belong in break-even ROAS
Include costs that change with an order or can be allocated consistently to the order being evaluated: product cost, outbound shipping, fulfillment, payment processing, marketplace fees, expected returns, and sales tax that is not revenue. Keep the revenue and cost basis consistent so VAT or refunds are not removed twice.
Fixed salaries, rent, software, and agency retainers require a deliberate allocation rule. Add an amount per order only when that is how the business manages contribution; otherwise test fixed-cost recovery in a monthly profit model. The calculator does not insert hidden overhead or a generic cost percentage.
Worked break-even ROAS example for a VAT-inclusive order
Suppose a $120 order includes 20% VAT, leaving $100 net sales. If COGS is $40, shipping is $8, payment and fulfillment fees are $4, and other variable cost is $3, then $45 remains for acquisition. That $45 is the break-even CPA before fixed overhead and profit.
If the ad platform reports the $120 customer-paid value, break-even ROAS is $120 divided by $45, or 2.67x. If it reports $100 net sales, the comparable floor is 2.22x. Neither number is a profit target: operating at the floor leaves zero first-order contribution after ads.
Break-even ROAS calculator FAQ for ecommerce and dropshipping
Is break-even ROAS the same as 1.0 ROAS?
No. A 1.0 ROAS only means attributed revenue equals ad spend. The business still has to cover product, fulfillment, payment, tax, and operating costs, so the true break-even ROAS is usually higher than 1.0.
Should fixed overhead be included?
Per-order break-even normally starts with variable contribution margin. Allocate fixed overhead per order or use a monthly model if the decision must cover salaries, rent, software, and other fixed expenses.
Does this calculator support VAT-free markets?
Yes. Set sales VAT and every recoverable cost VAT field to None or 0%. The amounts will be used as entered.
Should break-even ROAS use gross or net revenue?
Use the same conversion-value basis shown in the advertising report you will compare against. Select gross for customer-paid revenue including VAT or net when the platform reports revenue after VAT.