TACoS, or Total Advertising Cost of Sales, measures Amazon advertising spend against everything the account sells, not just the orders Amazon attributes to an ad click. Where ACoS asks "were the ads efficient?", TACoS asks "how dependent is the whole business on ads?". Amazon does not show TACoS as a column in the campaign manager; sellers calculate it from the advertising report and the business report in Seller Central.
How TACoS is calculated
TACoS = (ad spend ÷ total sales) × 100, where total sales is the ordered product sales figure for the same period, including organic orders.
Worked example: a home-décor seller spends ₹40,000 on Amazon Ads in a month. Ad-attributed sales are ₹1,60,000 (ACoS 25%). Total ordered product sales for the month are ₹4,00,000. TACoS = 40,000 ÷ 4,00,000 × 100 = 10%. Ads cost ten paise for every rupee the account earned.
The gap between ACoS and TACoS is the organic contribution. If the two numbers are close, almost every sale is being bought with ads. If TACoS is far below ACoS, organic rank is carrying much of the volume.
Why TACoS matters for sellers
ACoS alone can mislead. Raising bids on a launch pushes ACoS up, but if those paid orders lift the listing's organic rank, total sales grow and TACoS falls over the following weeks. Conversely, an account that cuts ad spend to "fix" ACoS often watches organic sales fall a month later, because Amazon's ranking rewards recent sales velocity. TACoS shows that second-order effect; ACoS does not.
A falling TACoS with flat or rising ad spend is the healthiest pattern: the ads are building an asset rather than renting traffic. A rising TACoS with flat sales usually means the listing, price or reviews need work before more budget is added.
How to manage TACoS
- Track it monthly per ASIN or product family, not just at account level, so a new launch does not mask a mature product that has become ad-dependent.
- Set a phase-based target. Accept a high TACoS for the first 60 to 90 days of a launch, then expect it to trend down as organic rank settles.
- Invest in conversion, not only clicks. Better images, A+ Content and reviews raise organic sales, which lowers TACoS without touching bids.
- Protect branded search. Keep a modest branded campaign so competitors cannot take the top of search on your brand name and eat into organic sales.
- Cut spend gradually. Reduce bids in 10 to 15% steps and watch organic rank for two weeks before the next cut.
Blooprint reports ACoS and TACoS side by side for every client under marketplace ads management. The Amazon ads guide for India explains how to pull both numbers from Seller Central.