Total Advertising Cost of Sale (TACoS) is total Amazon ad spend divided by total Amazon sales, including organic. Unlike Advertising Cost of Sale (ACoS), which only counts ad-attributed revenue, TACoS captures the organic halo your ads create when they push your products up the rankings. It's the more honest measure of how hard your ad dollars are working.
How TACoS is calculated
TACoS percent = (total ad spend divided by total sales) times 100. Total sales is the full Seller Central revenue line, ad-attributed plus organic combined.
A worked example
You spent $8,000 on Amazon ads this month. Ad-attributed sales were $32,000, so ACoS = 25 percent. But your total Amazon sales were $80,000 because the ads also lifted your organic rank. TACoS = $8,000 / $80,000 = 10 percent. The 10 percent TACoS is the real ad efficiency for the brand. The 25 percent ACoS hides the halo.
Healthy TACoS by stage
- New product launches: 25 to 50 percent (intentional investment to build rank)
- Growing sellers: 15 to 25 percent
- Mature, well-ranked sellers: 5 to 15 percent
- Defensive brands holding category share: 8 to 18 percent
The most common mistake
Reporting only ACoS to the CFO. ACoS-only reporting hides whether ads are doing real work for the brand. The right setup is TACoS as the headline operating metric, with ACoS underneath as a per-campaign diagnostic. When TACoS is dropping and total Amazon revenue is rising, your ads are compounding rank, not just buying clicks.
Browse the full ecommerce finance glossary for every metric and money term a DTC operator needs.
Frequently Asked Questions
what's actually a good tacos for my amazon brand?
Stage-dependent. New launches run 25 to 50 percent on purpose to build rank. Growing sellers should sit at 15 to 25 percent. Mature, well-ranked brands hold 5 to 15 percent. The direction matters more than the level. Declining TACoS over time means your organic flywheel is working.
tacos vs acos, why do i need both?
ACoS only counts sales Amazon credits to your ads. TACoS uses total sales including organic. When your ads drive rank, organic sales follow, and ACoS misses that completely. TACoS captures the full picture, which is why CFOs use TACoS as the headline ad metric and ACoS as a per-campaign diagnostic.
should tacos always be going down?
No, not always. New launches intentionally run high TACoS to build rank. Established brands defending category share may accept higher TACoS to hold off competitors. Rule of thumb: TACoS rising with flat revenue is a problem. TACoS rising with fast-growing revenue is intentional investment.