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What is TACoS?
Total Advertising Cost of Sales — ad spend as % of total revenue.
Detailed Explanation
TACoS (Total Advertising Cost of Sales) measures total ad spend as a percentage of total revenue, including both paid and organic sales. Unlike ACOS which only considers ad-attributed revenue, TACoS provides a holistic view of advertising efficiency by accounting for the 'halo effect' — how advertising boosts organic rankings and sales. TACoS = (Total Ad Spend ÷ Total Revenue) × 100. A healthy TACoS for most Amazon sellers is 5-15%. If TACoS is decreasing while sales grow, it indicates your advertising is successfully building organic momentum. TACoS is the preferred metric for long-term brand building assessment.