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Join early accessTACoS
Total advertising cost of salesAmazon ad spend as a percentage of total Amazon revenue, organic included.
TACoS (total advertising cost of sales) is ad spend divided by total Amazon revenue — organic sales included. Unlike ACoS, it shows how dependent your whole Amazon business is on ads. A low and falling TACoS usually means ads are lifting organic rank; a rising TACoS means you're leaning harder on ads to hold sales.
In practice
TACoS is the metric that catches what ACoS hides. Because the denominator is total revenue rather than ad-attributed revenue, it answers a question ACoS structurally cannot: how much of this product's business is actually being bought with ad spend? A product doing well on ads and badly organically looks fine in ACoS and poor in TACoS — and the second reading is the one that predicts next quarter.
The useful signal is the direction of the two together. Steady sales with a falling TACoS is the pattern you want: ads are earning rank, and organic is picking up more of the load. Steady sales with a rising TACoS means you're paying more to stand still, which is usually a listing, price or competitor problem that no bid adjustment will fix.
Formula
TACoS = Ad spend ÷ Total revenue × 100
Example: $3,000 spend on $40,000 total revenue = 7.5% TACoS.
What a good result depends on
Depends on stage — launches run 20%+, mature products often settle around 5–15%. Watch the trend.
Common mistakes
- Using TACoS for campaign decisions — that's ACoS's job.
- Ignoring whether total revenue is actually growing with the spend.
Questions people ask
- What's the difference between ACoS and TACoS?
- The denominator. ACoS divides ad spend by ad-attributed revenue; TACoS divides the same spend by total revenue including organic. ACoS judges the campaign, TACoS judges the product's dependence on ads.
- Is a falling TACoS always good?
- Only if revenue is holding or growing. TACoS also falls when you slash ad spend, so read it next to total sales — falling TACoS on falling revenue is a business shrinking, not improving.
- What TACoS should I aim for?
- It depends heavily on stage: launches commonly run high while you buy rank, and mature products settle lower. There's no universal target — your own trend over several months is the meaningful benchmark.