SellerWhy your ACoS looks high even when your ads are working
By Yaqoob Khan Zazai ·
ACoS only tells you how ads perform against ad sales. To know if advertising is helping the whole business, you need TACoS next to it.
What ACoS measures
ACoS (advertising cost of sales) divides what you spent on ads by the sales those ads directly produced. It is useful for comparing campaigns and keywords, but it only looks at the ad side of the account.
What ACoS misses
Ads do more than produce ad sales. They push a product up the search results, and better ranking brings organic sales that ACoS never counts. A campaign can look expensive on ACoS while it is quietly lifting the whole product.
Enter TACoS
TACoS (total advertising cost of sales) divides ad spend by all sales — ad and organic together. If TACoS goes down while total sales go up, ads are doing their job, even if ACoS looks high.
When a high ACoS is normal
New launches, new keywords and competitive categories usually start with a high ACoS. That is the cost of earning ranking. The question is whether organic sales follow, which is exactly what TACoS shows.
When a high ACoS is a real problem
If TACoS is flat or rising and organic sales are not growing, the spend is not building anything. That usually means wasted search terms, weak listings that don't convert the clicks, or bids set too high for the product's margin.
What we look at instead
We read ACoS and TACoS together, per product, against its margin. Each product gets a target that fits its stage — launch, growth or profit — and we adjust bids, negatives and budgets weekly against that target.