ACoS vs. TACoS: Which Metric Actually Matters

When I audit Amazon accounts, I almost always hear the same sentence: „Our ACoS is at 25 percent, is that good?“ My answer: it depends. Because ACoS alone tells you less than you think.

What ACoS Actually Measures

ACoS (Advertising Cost of Sale) is simple: ad spend divided by ad revenue. If you spend €100 and generate €400 through ads, your ACoS is 25 percent.

The problem: ACoS only looks at directly attributed ad revenue. It completely ignores what your ads do for your organic ranking, brand awareness, and overall profitability.

Why TACoS Is the Better Metric to Steer By

TACoS (Total Advertising Cost of Sale) puts your ad spend in relation to total revenue, meaning ad revenue plus organic revenue. And this is where it gets interesting.

A declining TACoS alongside growing total revenue means your ads are building organic momentum. You’re becoming less dependent on paid visibility. That’s the goal.

A rising TACoS with flat revenue means you’re pumping in more money without a lasting effect. That’s an orange alert.

How to Actually Calculate Your TACoS

Amazon doesn’t show you TACoS anywhere directly, you have to calculate it yourself. You need two numbers from two different reports:

• Total revenue: from the Business Report (detail page sales and traffic by ASIN), any time period.
• Ad spend: from the Sponsored Ads report for the same period, summed across all campaign types.

TACoS = ad spend ÷ total revenue. Calculate it weekly at the account level and monthly at the product level. A single snapshot tells you little, the trend across several weeks tells you everything.

A Practical Example

Brand A has an ACoS of 30 percent. Sounds high. But their TACoS is 8 percent, because 70 percent of their revenue comes organically. The ads pay for themselves through the flywheel effect.

Brand B has an ACoS of 18 percent. Sounds great. But their TACoS is 16 percent, because almost all revenue runs through ads. Turn off advertising, and everything collapses.

Which brand is in better shape? Clearly Brand A.

TACoS Benchmarks by Product Lifecycle Stage

A healthy TACoS isn’t a fixed number, it depends on which phase your product is in:

Phase	Share of Sales from PPC	Target TACoS	Focus
Launch	50–90%	30–60%+	Ranking, reviews, sales velocity
Expansion	30–50%	15–25%	Aggressive scaling
Harvest	20–30%	8–15%	Profit maximization

A 40 percent TACoS during launch is normal and no reason for concern. The same number in the harvest phase would be a clear warning sign. I break down what these three phases actually look like in my 90-day plan for Amazon product launches.

How to Use TACoS in Practice

Set TACoS targets instead of ACoS targets. For most categories outside the launch phase, a TACoS between 5 and 12 percent is a healthy range.

If your TACoS is above 15 percent, you have either a listing problem (conversion rate too low) or a structural problem (too much budget on non-converting keywords). You can check both against the bid formula: ideal bid = revenue per click × target ACoS. If your actual bid sits well below that, you’re leaving volume on the table, not saving margin.

The Most Common Mistake: A „Good“ ACoS That’s Actually a Problem

A 5 percent ACoS against a 25 percent target looks like a win. Most of the time it means your bid is set too low and you’re leaving sales volume on the table, not that your campaign is running exceptionally efficiently. I cover how to set up campaign structure and bids so this doesn’t happen in my overview of current PPC strategies for 2026.

Bottom Line

ACoS isn’t irrelevant, but it’s a tactical tool, not a strategic one. TACoS gives you the full picture. And only with the full picture can you make informed decisions.

Weighing tactical campaign numbers against the strategic big picture like this is exactly the first step in every Marketplace Audit I run for Amazon brands.

Frequently Asked Questions About ACoS and TACoS

What’s a good ACoS value?

There’s no universal good number, it depends on your margin and your product’s phase. A 25 percent ACoS can be bad for an established, high-margin brand and completely normal for a fresh launch.

What’s a good TACoS value?

Outside the launch phase, a healthy TACoS for most categories sits between 5 and 12 percent. During launch, 30 to 60 percent or more is normal, since there’s no organic revenue yet.

How do I calculate TACoS if Amazon doesn’t show it directly?

Take your total revenue from the Business Report and your ad spend from the Sponsored Ads report for the same period. TACoS is ad spend divided by total revenue.

Why can a low ACoS still be a problem?

A very low ACoS against a higher target usually means your bid is set too low. You’re missing out on sales volume you could actually afford at your target margin.

Should I steer my campaigns by ACoS or TACoS?

Use ACoS for tactical control of individual campaigns and keywords. Use TACoS as your strategic target at the account and product level, to see whether your advertising is moving things in the right direction overall.

How often should I track TACoS?

Weekly at the account level, monthly at the product level. Individual weeks fluctuate, the trend across several weeks shows you whether you’re actually becoming less dependent on paid visibility.

Does my target TACoS change by product phase?

Yes, significantly. Launch phases can tolerate a TACoS of 30 to 60 percent or more. In the harvest phase, it should come down to 8 to 15 percent once organic revenue and reviews are established.