TACoS vs ACoS on Amazon: which number tells you ads are making money
ACoS (advertising cost of sales) is ad spend divided by the sales those ads produced. TACoS (total advertising cost of sales) is ad spend divided by all sales, ads plus organic. ACoS tells you whether a campaign pays for itself; TACoS tells you whether advertising grows the business or buys sales the listing would have made anyway. Track both. When they disagree, TACoS is usually the one that matches your profit.
How are ACoS and TACoS calculated?
ACoS and TACoS share a numerator, ad spend, and differ only in what you divide it by. Amazon’s own guide to advertising cost of sales gives the ACoS formula as ACOS = (ad spend ÷ ad revenue) × 100, with the example of $50 spent and $100 earned for a 50% ACoS. That guide does not define TACoS, so sellers calculate it themselves from total sales in Seller Central.
| Metric | Formula | Result | What it answers |
|---|---|---|---|
| ACoS | ad spend ÷ ad-attributed sales × 100 | 30.0% | Does this campaign pay for itself? |
| TACoS | ad spend ÷ total sales × 100 | 14.8% | How much of all revenue goes back into ads? |
| ROAS | ad-attributed sales ÷ ad spend | 3.33 | ACoS turned upside down |
| Organic share | (total − ad-attributed sales) ÷ total sales | 50.7% | Is the listing selling without ads? |
What is break-even ACoS for my product?
Break-even ACoS equals your profit margin before advertising. Amazon puts it bluntly in the same guide: your ACOS “needs to be lower than your profit margin. Otherwise, you will be spending more on ads than you’re earning.” The hard part is calculating that margin honestly, with every Amazon fee inside it.
Here are real unit numbers from a party card game a brand we work with sells on Amazon for about $29. Production plus freight to the US costs $6. Amazon referral and FBA fulfillment fees take roughly $10. That leaves $13 a unit, so break-even ACoS is 13 ÷ 29 = 44.8%. The referral part is easy to check on Amazon’s selling fees page: 15% in many categories, Toys and Games and Home and Kitchen among them, with a $0.30 minimum per item; the Professional selling plan adds $39.99 a month on top.
| Line | Per unit |
|---|---|
| Selling price | $29.00 |
| Production and freight to the US | −$6.00 |
| Amazon referral and FBA fees | about −$10.00 |
| Left before advertising | $13.00 |
| Break-even ACoS (13 ÷ 29) | 44.8% |
Why can a lower ACoS make less money?
A lower ACoS can make less money when the ads take sales from your own organic listing instead of adding new buyers. The table below runs two sellers through the unit economics above (44.8% kept before ads). The figures are illustrative; the pattern is the one to look for in your own account.
| Seller and month | Total sales | Ad spend | Ad sales | ACoS | TACoS | Left after ads |
|---|---|---|---|---|---|---|
| Seller A, month 1 | $20,000 | $1,500 | $6,000 | 25.0% | 7.5% | $7,466 |
| Seller A, month 2: spend doubled | $20,300 | $3,000 | $10,000 | 30.0% | 14.8% | $6,100 |
| Seller B, month 1 | $20,000 | $3,300 | $6,000 | 55.0% | 16.5% | $5,666 |
| Seller B, month 3: organic rank up | $31,000 | $3,800 | $6,900 | 55.1% | 12.3% | $10,097 |
Judge these rows by ACoS alone and you would scale Seller A (a comfortable 30%, far under break-even) and cut Seller B (55%, above break-even). TACoS says the opposite. Seller A doubled spend, ad sales went up by $4,000, total sales went up by $300; the ads simply caught buyers who would have bought anyway, and $1,366 a month disappeared. Seller B paid a high ACoS while the listing climbed, total sales grew by more than half, and TACoS fell. The profit column agrees with TACoS.
What is a good TACoS on Amazon?
A good TACoS is one that stays below your margin before ads minus the profit you want to keep. For the $29 game that means 44.8% minus a 25% profit goal, so TACoS should stay under about 20%. Published “good TACoS” benchmarks skip this step, and a benchmark built on somebody else’s margin tells you very little about yours.
The trend matters as much as the level
During a launch TACoS runs high, because nearly every sale comes from ads. If organic rank is building, TACoS falls month by month even while ad spend stays flat, and the boxes keep going out without each one being paid for twice.
If TACoS climbs while total sales stay flat, the ads are buying sales you already had. That is the moment to cut bids on branded and top-of-search placements before you cut anything else.
What if break-even ACoS says ads cannot work?
Sometimes break-even ACoS shows that Amazon PPC cannot pay at the current price, and no amount of bid tuning will change that. The $29 game keeps $13 a unit to cover advertising and profit together. With a 44.8% ceiling and competitive clicks, there is very little room left once you also want to earn something.
Our recommendation for that brand was to stop tuning bids and change the basket: a bundle of two or three games at $69 to $79 leaves roughly $30 to $35 per order, which finally gives advertising something to work with. Fixing price and basket before ads is also why our Amazon PPC management starts from unit economics, and why weak listings go to listing optimization before they get more budget.
How do I track TACoS every week?
- Export ad spend and ad-attributed sales for the week from the Amazon Ads console.
- Take total ordered product sales for the same dates from Seller Central business reports.
- Calculate ACoS, TACoS and organic share, one row per week, in one sheet.
- Compare TACoS with your ceiling (margin before ads minus target profit) and read the four-week direction, not a single week.
- When ACoS is above break-even but TACoS is falling, check organic rank before you cut the campaign.
Questions sellers ask about TACoS and ACoS
Is a high ACoS always bad?
A high ACoS is bad when it sits above break-even and total sales are not growing. During a launch, or while a listing climbs in organic rank, an ACoS above break-even can be a deliberate investment, as long as TACoS falls over the following weeks.
Where do I get total sales for TACoS?
Total sales for TACoS come from Seller Central business reports (ordered product sales) for the same dates as the ad report. If you divide by ad-attributed sales from the ad console instead, you have calculated ACoS again.
Should TACoS go down over time?
For a product that is gaining organic rank, TACoS should fall even while ad spend holds steady. A TACoS that rises for several weeks while total sales stay flat means ads are replacing organic sales instead of adding to them.
What is the difference between ACoS and ROAS?
ROAS is ACoS upside down. Amazon’s guide gives ROAS = ad revenue ÷ ad spend and ACOS = ad spend ÷ ad revenue × 100, so a 25% ACoS is the same campaign as a ROAS of 4.
Not sure your ads are adding sales?
Send us 8 weeks of ad spend, ad sales and total sales. We will calculate break-even ACoS and TACoS for your products and show where the money goes.