Core formulas
The formulas to keep straight
ACOS = ad spend / ad-attributed sales x 100TACoS = ad spend / total sales x 100ROAS = ad revenue / ad spendBreak-even ACOS = contribution margin before adsTarget TACoS = ad spend / profitable total salesWhat does TACoS mean on Amazon?
TACoS means total advertising cost of sales. It divides ad spend by total sales, then turns the result into a percentage. A product with $300 ad spend and $3,000 total sales has 10% TACoS.
The point is simple: ACOS tells you how ads performed against ad-attributed sales. TACoS tells you how much total revenue depended on ad spend. Use both, because each one catches a different problem.
A product with $300 ad spend and $3,000 total sales has 10% TACoS.
TACoS formula example, verified July 4, 2026
| Metric | Formula | Example | Result |
|---|---|---|---|
| ACOS | Ad spend / ad sales | $300 / $1,200 | 25% |
| ROAS | Ad sales / ad spend | $1,200 / $300 | 4.00x |
| TACoS | Ad spend / total sales | $300 / $3,000 | 10% |
| Organic sales | Total sales - ad sales | $3,000 - $1,200 | $1,800 |
What is a good TACoS?
A good TACoS is one that fits your margin and growth stage. For a mature product, TACoS should usually fall or stay steady while total profit grows. For a launch, TACoS can run higher while ads build ranking, reviews, and keyword data.
Do not judge TACoS alone. If TACoS falls because you cut ads and total sales collapse next week, that is not healthy. If TACoS falls while total sales and contribution profit rise, the account is getting stronger.
A 10% TACoS spends $10 on ads for every $100 in total sales.
How to read TACoS by product stage
| Product stage | TACoS pattern | Best reading |
|---|---|---|
| Launch | High or uneven | Acceptable if ranking and data improve |
| Early traction | Falling slowly | Good if total sales rise |
| Mature product | Stable or low | Healthy if profit is protected |
| Discount push | Can look low | Check profit after coupons |
| Declining product | Low but sales falling | Not enough by itself |
What is the difference between ACOS and TACoS?
ACOS uses ad-attributed sales. TACoS uses total sales. That means ACOS is better for judging campaign efficiency, while TACoS is better for judging whether ads are taking too much of the whole business.
Amazon Ads defines ACOS as ad spend divided by ad revenue. That is campaign math. TACoS is a seller-side business metric, so you calculate it from total sales in your account or SKU report.
ACOS can improve while TACoS gets worse if total sales fall faster than ad spend.
- Use ACOS to audit campaign and keyword efficiency.
- Use TACoS to audit blended business pressure.
- Use margin to decide whether either number is profitable.
- Use total profit to decide whether growth is worth the spend.
How do you lower TACoS without hurting sales?
Lower TACoS by fixing the product economics before cutting spend. Improve listing conversion, remove wasteful keywords, protect profitable campaigns, and raise price only when the offer can carry it.
The lazy move is to cut ads until TACoS looks good. The better move is to make each dollar work harder while watching total sales. A beautiful TACoS with shrinking profit is not a win.
If ad spend stays $300 and total sales rise from $3,000 to $4,000, TACoS falls from 10% to 7.5%.
- Check break-even ACOS before scaling.
- Separate branded, defensive, and discovery campaigns.
- Cut spend where clicks do not convert.
- Fix listing conversion before raising the budget.
- Track total sales, ad sales, ad spend, and profit each week.
Decision table
TACoS decision rules
| Signal | Likely meaning | Best move |
|---|---|---|
| ACOS high, TACoS high | Ads are expensive and total sales depend on them | Fix margin and targeting |
| ACOS high, TACoS low | Organic sales may be carrying the SKU | Audit ad campaigns carefully |
| ACOS low, TACoS high | Ads efficient, but spend is large versus total sales | Check budget mix |
| TACoS falling, profit rising | Healthy efficiency gain | Scale carefully |
| TACoS falling, sales falling | Spend cut may be starving growth | Rebuild demand |
Worked examples
Examples you can compare against your own numbers
Example: same ACOS, better TACoS
An Amazon seller spends the same $300 on ads in two different months.
| Month 1 total sales | $3,000 | TACoS is 10% |
|---|---|---|
| Month 2 total sales | $4,000 | TACoS is 7.5% |
| Ad spend | $300 | Same spend both months |
| Decision | Month 2 is better | Only if profit also rose |
Takeaway: Lower TACoS matters when it comes from stronger total sales, not just lower spend.
Action checklist
Before you use this number in the real business
- 1Record ad spend for the SKU or account.
- 2Record ad-attributed sales.
- 3Record total sales.
- 4Calculate ACOS and TACoS separately.
- 5Compare both numbers with contribution margin.
- 6Make budget decisions from profit, not TACoS alone.
Common mistakes
Mistakes that make the answer look better than reality
FAQs
Questions people ask before making the decision
What is TACoS on Amazon?
TACoS is ad spend divided by total sales, shown as a percentage. It tells you how much of total revenue is being spent on ads.
How do you calculate TACoS?
Divide ad spend by total sales and multiply by 100. If ad spend is $300 and total sales are $3,000, TACoS is 10%.
Is TACoS better than ACOS?
No. TACoS and ACOS answer different questions. ACOS checks campaign efficiency, while TACoS checks total business pressure from ads.
Should TACoS always go down?
No. A launch can have high TACoS while ads build ranking. For a mature product, TACoS should usually stabilize or fall while profit holds.
What is the TACoS formula?
The formula is ad spend divided by total sales, multiplied by 100. Use total sales, not only ad-attributed sales.
Sources and notes
Where the assumptions come from
Official Amazon Ads guide defining ACOS and ROAS.
FeeProofed guide for converting ACOS and ROAS.
FeeProofed guide for judging ad spend from contribution margin.