Ask any Amazon PPC manager what metric they optimise for, and the answer is almost always ACoS — Advertising Cost of Sales. ACoS has dominated Amazon advertising conversations for years. But it only tells part of the story.
TACoS — Total Advertising Cost of Sales — is the metric that gives you the complete picture. And for serious Amazon sellers, it is arguably more important than ACoS.
Already know the theory? Jump straight to our free Amazon TACoS Calculator to run your own numbers and see how your advertising health stacks up.
What Is ACoS?
ACoS (Advertising Cost of Sales) measures how efficiently your ads convert spend into ad-attributed revenue.
Example: You spend $500 on ads and generate $2,000 in ad-attributed sales. Your ACoS is 25%.
ACoS answers the question: For every dollar of revenue my ads generated, how much did I spend on those ads?
A 25% ACoS means you spent $0.25 in ads for every $1 of ad revenue. Whether that is good or bad depends entirely on your product margin.
What Is TACoS?
TACoS (Total Advertising Cost of Sales) measures your ad spend as a percentage of your total revenue — not just your ad-attributed revenue.
Example: You spend $500 on ads, generate $2,000 in ad-attributed sales, but your total store revenue is $8,000. Your TACoS is 6.25%.
TACoS answers a more important question: What percentage of my entire business revenue am I spending on advertising?
Why TACoS Matters More Than ACoS Alone
Here is a scenario that shows why ACoS alone can mislead you:
| Seller | Total Revenue | Ad Revenue | Ad Spend | ACoS | TACoS |
|---|---|---|---|---|---|
| Seller A | $10,000 | $9,000 | $1,800 | 20% | 18% |
| Seller B | $10,000 | $3,000 | $600 | 20% | 6% |
Both sellers have identical ACoS (20%). But their businesses are very different. Seller A is spending $1,800 on ads and 90% of their revenue comes from paid traffic — they are heavily ad-dependent. Seller B spends only $600 and 70% of their revenue is organic. Seller B has a far healthier, more sustainable business.
TACoS reveals this difference. ACoS hides it.
What Is a Good TACoS for Amazon Sellers?
| TACoS Range | Rating | What It Means |
|---|---|---|
| 0–5% | Excellent | Very strong organic sales base; ads are supplementary |
| 5–10% | Good | Healthy mix of organic and paid; ads are helping without dominating |
| 10–15% | Average | Normal for growing brands and products building organic rank |
| 15–25% | High | Heavy reliance on ads; needs review unless in launch phase |
| 25%+ | Very High | Potentially unsustainable; immediate campaign optimisation needed |
Context always matters. A 25% TACoS for a product in its first 60 days of launch may be completely intentional and strategic. The same TACoS for a 2-year-old established product is a red flag. Always interpret TACoS in the context of your product lifecycle stage.
The Relationship Between TACoS and Organic Rank
This is the most powerful insight TACoS gives you — and it is why successful sellers watch it so closely.
When your ads drive sales, those sales send positive signals to Amazon's A9 algorithm — signals that your product is relevant and converts well. This helps your product rank higher in organic search results. As your organic rank improves, more customers find you without ads, which grows your organic revenue and naturally lowers your TACoS over time.
This means:
- A rising TACoS over time suggests your organic rank is slipping — ads are doing more heavy lifting than before
- A falling TACoS over time (with stable or growing revenue) is a sign your organic rank is improving — ads are working strategically
- A stable TACoS suggests your organic and paid mix is stable
TACoS vs ACoS: Side-by-Side Summary
| Feature | ACoS | TACoS |
|---|---|---|
| Formula | Ad Spend ÷ Ad Revenue | Ad Spend ÷ Total Revenue |
| What it measures | Ad campaign efficiency | Overall ad impact on business |
| Includes organic sales? | No | Yes |
| Best for | Campaign-level optimisation | Business health assessment |
| Typical target | Below your break-even ACoS | Below 10% for established products |
| Launch phase target | Higher is acceptable | Higher is acceptable |
What Is Break-Even ACoS?
Your break-even ACoS is the maximum ACoS at which you neither make nor lose money on ad sales. It equals your product profit margin percentage. For example, if your product margin is 28%, your break-even ACoS is 28%. Any ACoS above that means you are losing money on ad-driven sales; below it means you are profitable on ads.
This is why knowing your FBA profit margin (from our FBA Calculator) is essential before interpreting your ACoS.
How to Calculate Your TACoS
You need two numbers from Amazon Seller Central:
- Total Revenue: Seller Central → Reports → Business Reports → Ordered Product Sales for your chosen period
- Total Ad Spend: Amazon Advertising Console → Campaign Manager → Total Spend for the same period
Then: TACoS = (Ad Spend ÷ Total Revenue) × 100
Or use our free calculator to do it instantly and see your organic revenue split at the same time:
Calculate Your TACoS Now
Get your TACoS, ACoS, ROAS, and organic revenue split instantly.
Use the TACoS Calculator →Frequently Asked Questions
Yes — and it almost always is, unless 100% of your revenue comes from ads. Since TACoS uses total revenue (organic + paid) in the denominator and ACoS only uses ad-attributed revenue, TACoS will typically be lower. If your TACoS is higher than your ACoS, something is wrong with the data you are using.
Monthly is a good cadence for most sellers. Weekly can be useful during product launches or aggressive campaign periods. Avoid daily TACoS checking — day-to-day variation is too noisy to be meaningful. Look for trends over 30, 60, and 90-day periods.
Yes. A useful approach is to set a maximum TACoS equal to your target advertising spend as a percentage of revenue. For example, if you want advertising to account for no more than 8% of your total costs, your TACoS target is 8%. Work backwards from this to set campaign-level ACoS targets for your individual products.