ACoS measures your ad spend against ad-attributed sales only. TACoS measures your ad spend against total sales - ads plus organic. ACoS tells you how efficient your campaigns are; TACoS tells you how dependent your whole business is on advertising. For long-term, profitable growth, you should optimize for TACoS and profit, not ACoS alone.
ACoS: campaign efficiency
ACoS = ad spend / ad sales. It answers a narrow question: how efficient is this campaign at turning spend into ad sales? It is useful for managing individual campaigns, but it ignores all the organic sales your ads may be driving.
TACoS: business health
TACoS = ad spend / total sales (ad + organic). It answers a bigger question: how reliant is the whole brand on ads? A low or falling TACoS means organic sales are growing and ads are doing their job - building rank, not just buying orders.
Why a falling TACoS is the goal
If your TACoS drops over time while sales hold or grow, your ads are compounding into organic rank and momentum. If TACoS keeps rising, you are buying more and more of your own sales - a warning sign even if ACoS looks fine.
Use both together
Manage campaigns by ACoS, but judge the account by TACoS and contribution profit. A campaign can have a great ACoS and still be part of a business with an unhealthy, rising TACoS. The two views together keep you honest.
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Frequently asked questions
- What is the difference between ACoS and TACoS?
- ACoS compares ad spend to ad-attributed sales only; TACoS compares ad spend to total sales (ads plus organic). ACoS shows campaign efficiency; TACoS shows business-wide ad dependence.
- Should I optimize for ACoS or TACoS?
- Manage individual campaigns by ACoS, but judge the overall account by TACoS and profit. A falling TACoS over time is the sign of healthy growth.
- What is a good TACoS?
- It varies by brand and stage, but a stable or falling TACoS while sales grow is healthy. A steadily rising TACoS means you are buying more of your own sales.
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