2026-06-11 · 10 min read
Amazon ACoS vs TACoS: What They Mean and Which One Actually Matters
ACoS and TACoS measure Amazon PPC performance differently. This guide explains both metrics, how to calculate them, and what benchmarks to target.
ACoS (Advertising Cost of Sales) is the metric Amazon shows you by default in Campaign Manager. It tells you how much you spent on ads relative to the revenue those ads directly generated. TACoS (Total Advertising Cost of Sales) is the metric most experienced sellers use instead. It measures ad spend against total revenue, including sales that were not directly attributed to a click.
The difference matters a lot when you are deciding whether your advertising is profitable.
How ACoS is calculated
ACoS = ad spend divided by attributed sales, multiplied by 100.
If you spent $100 on ads and those clicks generated $500 in attributed sales, your ACoS is 20%. Amazon shows this number prominently in Campaign Manager.
The problem with ACoS in isolation: attributed sales only count purchases that came directly from a sponsored ad click within the attribution window (usually 7 days for Sponsored Products). If a buyer sees your ad, does not click, searches your brand later, and buys organically, that sale is not counted in your attributed sales. ACoS looks worse than your actual advertising contribution.
How TACoS is calculated
TACoS = ad spend divided by total store revenue (ad-attributed plus organic), multiplied by 100.
If you spent $100 on ads and your total revenue that week was $2,000 (including $1,500 in organic sales), your TACoS is 5%.
TACoS tells you what percentage of your total business you are spending on advertising. That is the number that tells you whether your PPC investment is sustainable and whether it is building organic momentum over time.
What good benchmarks look like
ACoS benchmarks vary widely by category and business stage. For established products with strong organic rank: target ACoS between 10% and 20%. For new product launches where you are buying rank: 30% to 50% ACoS is acceptable short-term. Defensive campaigns to protect your brand terms: ACoS above 50% can still make sense if the alternative is a competitor owning your brand searches.
TACoS benchmarks: under 10% TACoS is healthy for a mature product. Between 10% and 20% means advertising is doing significant work. Above 20% suggests you are heavily dependent on ads to generate revenue, which is a profitability risk as CPC costs rise.
Break-even ACoS
Break-even ACoS is the ACoS at which advertising neither adds nor subtracts from profitability. Calculate it by subtracting all costs from your selling price and dividing by your selling price.
Example: product sells for $30. Cost of goods: $8. FBA fees: $6. Referral fee: $4.50. Your margin before advertising is $11.50, which is 38.3% of the selling price. Your break-even ACoS is 38.3%. Any campaign running below that ACoS is contributing to profit. Any campaign above it is losing money per click.
When to optimize for ACoS vs TACoS
Optimize for ACoS when: you are managing profitability on a product that already ranks well organically, you are cutting unprofitable keywords, or you are in a mature product lifecycle.
Optimize for TACoS when: you are launching a new product and willing to accept short-term ad losses to build organic rank, you are evaluating the overall health of your advertising spend relative to business size, or you are comparing advertising efficiency across multiple products.
The halo effect problem
One reason ACoS overstates the cost of advertising: PPC drives ranking. Higher ranking drives organic sales. Those organic sales do not appear in attributed sales but they would not exist without the ad investment. TACoS captures this halo effect because it includes all revenue in the denominator.
Sellers who only look at ACoS often cut campaigns that are actually building organic rank, then wonder why organic sales dropped a month later.
How to track both metrics
Amazon Campaign Manager shows ACoS automatically. TACoS requires pulling total revenue from the Business Reports section and dividing ad spend by it manually. Many third-party tools (Scale Insights, Perpetua, Helium10 Adtomic) calculate TACoS automatically if you connect your ad account.
Track both weekly. If ACoS is rising but TACoS is holding steady or falling, your organic sales are growing and the ads are working. If both are rising together, your ad spend is outpacing revenue growth and something needs adjustment.