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ACoS vs TACoS: Differences, Formulas and Examples
ACoS (advertising cost of sales) is ad spend divided by the sales those ads generated. TACoS (total advertising cost of sales) is ad spend divided by all your sales, ads plus organic. ACoS tells you how efficient your ads are. TACoS tells you how much of your whole business you spend on ads, and whether ads are helping your organic sales grow.
Key takeaways
- ACoS = ad spend ÷ ad sales. TACoS = ad spend ÷ total sales.
- TACoS is always equal to or lower than ACoS, because total sales include ad sales.
- Your net margin is roughly your margin before ads minus your TACoS.
- Read them together: rising ACoS with falling TACoS can be a healthy sign; falling ACoS with rising TACoS is a warning.
The formulas
| Metric | Formula | Answers the question |
|---|---|---|
| ACoS | Ad spend ÷ ad-attributed sales × 100 | Are my ads efficient? |
| TACoS | Ad spend ÷ total sales × 100 | How dependent is my business on ads? |
| ROAS | Ad-attributed sales ÷ ad spend | How many dollars of ad sales per $1 spent? |
Amazon defines ACOS as ad spend divided by ad revenue, times 100, and ROAS as the inverse: ad revenue divided by ad spend. TACoS isn't a standard column in Amazon's campaign reports, so you calculate it yourself.
There is a simple link between the two:
TACoS = ACoS × (ad sales ÷ total sales)
So if 40% of your sales come from ads and your ACoS is 25%, your TACoS is 25% × 0.40 = 10%.
Worked example
Say your product sold $30,000 last month. Of that, $10,000 came from ad clicks and you spent $3,000 on ads.
- ACoS = $3,000 ÷ $10,000 = 30%
- TACoS = $3,000 ÷ $30,000 = 10%
- ROAS = $10,000 ÷ $3,000 = 3.33
- Organic share = $20,000 ÷ $30,000 = 67% of sales came without a paid click
A 30% ACoS might look expensive on its own. But the business as a whole spends only 10 cents of every sales dollar on ads. If your margin before advertising is 40%, you keep about 30% after ads.
That's the main reason to track TACoS: ACoS judges your ads; TACoS judges your profit. To work out your margin before advertising, see how to calculate Amazon profit margin.
Why TACoS matters: ads lift organic rank
Amazon's organic ranking leans heavily on sales velocity and conversion for each search term. When ads drive sales for a keyword, those sales can help your organic rank for that keyword. Over time, more of your sales come organically, and your ad spend becomes a smaller share of total revenue.
That's why TACoS often falls as a product matures, even if ACoS stays about the same. Here's how a launch might look:
| Month | Ad spend | Ad sales | Total sales | ACoS | TACoS |
|---|---|---|---|---|---|
| 1 | $2,000 | $4,000 | $5,000 | 50% | 40% |
| 2 | $2,500 | $6,250 | $9,000 | 40% | 27.8% |
| 3 | $2,800 | $8,000 | $16,000 | 35% | 17.5% |
| 4 | $3,000 | $10,000 | $25,000 | 30% | 12% |
Ad spend went up every month, but TACoS fell from 40% to 12% because total sales grew much faster. If you looked at ad spend alone, you might have cut budget in month 2 and stalled the launch. This is why launches are judged on TACoS and total sales, not ACoS alone.
How to read ACoS and TACoS together
Trends matter more than single numbers. Compare month over month (or over rolling 30-day windows):
| ACoS | TACoS | What it usually means | What to do |
|---|---|---|---|
| Down | Down | Ads are more efficient and organic sales are growing | Healthy. Consider scaling winning campaigns |
| Up | Down | Ads cost more per sale, but organic sales are growing faster | Often fine during a ranking push. Keep an eye on net margin |
| Down | Up | Ads look efficient, but organic sales are shrinking | Warning. Check organic rank, reviews, price, stock and competitors |
| Up | Up | Ads cost more and aren't lifting total sales | Fix. Cut wasted spend, review bids and targets |
| Flat | Flat | Stable | Test new keywords or placements if you want growth |
The third row is the one sellers miss most. Your ACoS can look great while your business quietly shrinks, for example if you lose organic rank and your ads are just picking up sales you used to get for free. Branded keyword campaigns are a common cause: they often show a very low ACoS, but many of those buyers would have found you anyway.
What's a healthy TACoS?
There's no universal target. It depends on your margin and your goals. Use this simple rule:
Net margin ≈ margin before advertising − TACoS
If your margin before ads is 40% and you want a 25% net margin, your TACoS ceiling is 15%. If you want to grow fast and accept a 15% net margin, you can run a 25% TACoS.
As a rough rule of thumb, many established private-label products run TACoS in the high single digits to mid teens, while new launches often run far higher for the first months. Low-margin products need a lower TACoS; high-margin products can afford more. For ACoS benchmarks, see what is a good ACoS.
Where to find the numbers
Ad spend and ad sales (for ACoS):
- Open Campaign Manager in the Amazon Ads console.
- Set the date range.
- Read the Spend, Sales and ACOS columns. For product-level data, download the Advertised Product report from Measurement & Reporting > Sponsored ads reports.
Total sales (for TACoS):
- In Seller Central, go to Reports > Business Reports.
- Open Detail Page Sales and Traffic by Child Item (or by Parent Item).
- Use Ordered Product Sales for the same date range.
Then divide total ad spend (all ad types) by Ordered Product Sales.
Common mistakes
1. Mismatched date ranges
Ad sales are tied to the date of the ad click and use an attribution window: 7 days for Sponsored Products ads run by sellers, and 14 days for Sponsored Brands and Sponsored Display. Business Reports count sales by order date. Over a few days, the numbers won't line up. Use at least 30-day windows to smooth this out.
2. Leaving out ad types
TACoS should include every ad dollar: Sponsored Products, Sponsored Brands, Sponsored Display and DSP if you use it. Counting only Sponsored Products makes TACoS look better than it is.
3. Comparing TACoS across very different products
A $12 consumable and a $90 furniture item have very different margins and buying cycles. Set TACoS targets per product or product group, not one number for the whole catalog.
4. Ignoring halo sales at the ASIN level
An ad for one ASIN (Amazon Standard Identification Number) can drive a sale of another product in your brand. Amazon credits these as ad sales on the advertised campaign. Per-ASIN TACoS can look odd as a result, so also check TACoS at the parent or brand level.
5. Chasing a low ACoS at the cost of growth
Cutting bids until ACoS looks great often cuts total sales too. If ACoS falls but total sales and organic rank fall with it, you have not improved anything.
Bottom line
ACoS measures how efficiently your ads turn spend into ad sales. TACoS measures how much of your total revenue goes to ads, and whether ads are helping organic sales grow. Track both monthly, read them together, and set targets from your own margin. Start by finding your break-even ACoS, then plug your numbers into the free Break-even ACoS & Max Bid Calculator.
Frequently asked questions
Is a lower TACoS always better?
Not always. A very low TACoS can mean you are under-investing in ads and leaving sales and rank on the table, especially in a growing category. The goal is a TACoS that leaves you a healthy net margin while total sales keep growing. Watch total sales alongside TACoS, not TACoS alone.
Can TACoS be higher than ACoS?
No, as long as you calculate both over the same period and the same ad spend. TACoS divides ad spend by total sales, and total sales always include ad sales, so TACoS is always equal to or lower than ACoS. If your TACoS comes out higher, check that you are using the same date range and the same ad types in both numbers.
Does Amazon show TACoS in Seller Central or the Ads console?
Amazon's standard campaign reports show ACOS, but TACoS needs total sales from Seller Central, so most sellers calculate it themselves in a spreadsheet or use a third-party tool. Pull ad spend from the Ads console and total sales from Business Reports for the same dates.
Should I include Sponsored Brands and Sponsored Display in TACoS?
Yes. TACoS should include all advertising spend for the product or brand, including Sponsored Products, Sponsored Brands, Sponsored Display and any Amazon DSP spend. Leaving out some ad types makes TACoS look better than it really is.
What is the difference between ACoS and ROAS?
They are the same data flipped. ACoS is ad spend divided by ad sales, shown as a percentage. ROAS (return on ad spend) is ad sales divided by ad spend. A 25% ACoS equals a ROAS of 4, and a 50% ACoS equals a ROAS of 2.
Amazon fees, policies and features change often. Figures here were checked in October 2026; confirm current rates in Seller Central before making pricing or budget decisions. Sotrics is not affiliated with Amazon.