Which is more important, ACoS or TACoS?

TACoS is more important for long-term brand health. ACoS is more useful for short-term campaign optimization. Mature brands report both, but make strategic decisions based on TACoS trends.

Can ACoS be low while TACoS is high?

Yes, if your campaigns are efficient but you depend heavily on ads for total revenue. This usually means weak organic rank — fixing it requires investing in content, reviews, and listing optimization, not just bid changes.

Can TACoS be low while ACoS is high?

Yes, and it can be a healthy signal. It means your ad campaigns are inefficient on their own, but your organic sales are large enough that total ad pressure remains low. Test whether pausing weak campaigns hurts organic rank.

What ACoS to TACoS ratio is healthy?

A common rule of thumb: TACoS should be roughly 30-50% of ACoS. If TACoS is closer to ACoS, you are over-indexed on paid. If TACoS is far below ACoS, organic is doing the heavy lifting.

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Profitability

Advertising ROI

ACoS vs TACoS

Essential Amazon seller metric for profitability

What is ACoS vs TACoS?

ACoS and TACoS both measure Amazon ad efficiency, but with different denominators. ACoS = Ad Spend / Ad-Attributed Sales. TACoS = Ad Spend / Total Sales (organic + paid). ACoS is for tuning individual campaigns. TACoS is for measuring whether your brand is becoming healthier over time.

Data Source

Advertising + Business Reports

Update Frequency

Daily

Measurement Units

Percent

Available at: Account, Brand

Formula

ACoS = Ad Spend / Ad Sales × 100 · TACoS = Ad Spend / Total Sales × 100

Worked Example

A brand spends $4,000 on ads. Those ads drove $20,000 in ad-attributed sales. Total brand revenue for the period was $80,000. • ACoS = 4000 / 20000 = 20% • TACoS = 4000 / 80000 = 5% The ACoS tells you each ad campaign was profitable. The TACoS tells you ads are only 5% of total revenue — a healthy ratio with strong organic flow.

When each metric matters most

Tier	Range / Signal
Good	Use TACoS for monthly executive reporting and brand-level decisions
Average	Use ACoS for daily bid optimization and campaign-level decisions
Watch out	Looking at ACoS in isolation often hides over-reliance on paid traffic

Frequently Asked Questions