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Manage both, but for different jobs. ACoS (ad spend divided by ad-attributed sales) tells you whether a specific campaign pays for itself. TACoS (ad spend divided by total sales, including organic) tells you whether advertising is growing the whole business. Use ACoS to tune bids and keywords; use TACoS to judge overall ad strategy and account health.
Here is the short version before the detail:
- ACoS is a campaign-level efficiency check; TACoS is an account-level health check.
- Rising TACoS with flat total sales is a warning sign; falling TACoS with rising total sales is the goal.
- A high ACoS on a launch campaign can be fine if TACoS stays controlled and organic rank improves.
- Never optimize bids to ACoS alone on a mature listing — you can starve organic growth.
- Track both weekly, but make budget decisions monthly against total sales and margin.
What is the difference between ACoS and TACoS?
ACoS is advertising cost of sales: ad spend divided by ad-attributed sales, expressed as a percentage. TACoS is total advertising cost of sales: the same ad spend divided by total sales, including organic sales. ACoS isolates campaign performance; TACoS shows how much of your entire revenue is being spent on advertising.
Both metrics use the same numerator — ad spend — but a different denominator. That single difference changes what the number is telling you. If you sell $10,000 in a month and spend $1,000 on ads, your TACoS is 10%. If only $5,000 of that revenue came from ads, your ACoS is 20%. Same spend, two very different readings.
How do you calculate ACoS and TACoS?
ACoS equals ad spend divided by ad-attributed sales. TACoS equals ad spend divided by total sales (ad-attributed plus organic). Both are usually shown as percentages. Amazon's advertising console reports ACoS directly; TACoS you calculate yourself from total ordered product sales.
Worked example (illustrative)
Say a listing generates $30,000 in total sales this month. $12,000 of that is attributed to Sponsored Products and Sponsored Brands campaigns, and you spent $2,400 on ads.
- ACoS = $2,400 ÷ $12,000 = 20%
- TACoS = $2,400 ÷ $30,000 = 8%
At 20% ACoS the campaign looks borderline. At 8% TACoS the account looks healthy. Both statements are true. The mistake is picking one and ignoring the other.
ACoS vs TACoS: side-by-side comparison
ACoS is a campaign diagnostic and TACoS is a portfolio diagnostic. ACoS answers "is this keyword or ad group profitable?" TACoS answers "is my ad budget producing enough total revenue?" You need the first to make bid changes and the second to set budgets.
| Factor | ACoS | TACoS |
|---|---|---|
| Formula | Ad spend ÷ ad sales | Ad spend ÷ total sales |
| Scope | Campaign, ad group, keyword | Account, brand, product line |
| Best used for | Bid and keyword decisions | Budget and strategy decisions |
| Blind spot | Ignores organic sales | Hides poor campaign performance |
| Healthy direction | Below your break-even ACoS | Falling while total sales rise |
| Reporting source | Amazon Ads console | Calculated from business reports |
Which metric should you manage day to day?
Manage ACoS day to day and TACoS month to month. Daily bid and negative-keyword decisions belong to ACoS because campaigns are where you actually make changes. Budget allocation and launch strategy belong to TACoS because those decisions affect organic rank and total revenue, not just ad efficiency.
Techtwist Editorial Team, E-commerce Operations at Techtwist, notes that the most common operator error is treating ACoS as a single pass/fail number. ACoS is a tool for comparison — between keywords, between ad types, between months — not a target you hit once and stop watching.
Break-even ACoS is the ceiling. It equals your product margin before ad spend. If a product has a 30% pre-ad margin, an ACoS above 30% loses money on ad-attributed sales. Many sellers aim for a target ACoS below break-even and a TACoS that trends down as organic rank builds.
When should you accept a high ACoS?
Accept a high ACoS during launches, on strategic defense campaigns, and on products where ad-attributed sales undercount the real lift. A new listing often runs above break-even ACoS for weeks while it accumulates reviews and organic rank. Cutting it too early kills the organic flywheel before it starts.
Defensive campaigns — bidding on your own brand terms — often show high ACoS because you are paying for clicks you might have gotten free. That is fine if the alternative is a competitor appearing above you. Judge these campaigns by TACoS and total sales, not by ACoS.
- Launch phase: tolerate ACoS above break-even if TACoS stays within budget.
- Mature phase: tighten ACoS toward break-even and watch TACoS fall.
- Defensive: accept high ACoS to protect brand terms and buy-box share.
What TACoS trends should worry you?
Rising TACoS with flat or falling total sales is the clearest warning sign in Amazon advertising. It means you are spending more to stand still — often because organic rank is slipping or ad-attributed sales are cannibalizing organic sales. Falling TACoS with rising total sales is the healthy pattern.
A single month is noise. Look at a rolling eight to twelve weeks. Seasonal products distort TACoS badly in Q4, so compare like months. If TACoS climbs for two consecutive months while total sales are flat, audit campaign structure, search-term reports and listing conversion rate before adding budget.
For sellers running multiple channels, the same logic applies on Walmart and eBay, though the reporting tools differ. Techtwist manages advertising across Amazon, Walmart, eBay and Shopify, and the rule is consistent: measure ad efficiency at the campaign level, measure ad health at the account level.
How do you put both metrics into a weekly routine?
Review ACoS weekly inside each campaign and TACoS monthly across the account. Weekly ACoS reviews catch wasted spend fast; monthly TACoS reviews catch strategy drift. Keep a simple spreadsheet or dashboard that pulls ad spend, ad sales and total sales from the same date range.
- Monday: pull last week's ACoS by campaign. Pause keywords above break-even with no conversions.
- Wednesday: check search-term reports for new negatives and new exact-match opportunities.
- Month end: calculate TACoS. Compare to the prior three months and to the same month last year.
- Quarterly: reset target ACoS by product based on current margin, not last year's margin.
If you want this run for you rather than added to your own to-do list, Techtwist's PPC management service manages campaigns against profit, and the marketplace management team keeps listings and organic rank moving alongside the ads.
People Also Ask
Is a lower TACoS always better?
No. A very low TACoS can mean you are underinvesting and leaving organic growth on the table. The goal is a TACoS that supports total sales growth, not the lowest possible number. Compare TACoS against total sales trend, not in isolation.
Can ACoS be lower than TACoS?
No, not if the numbers cover the same period and the same ad spend. Ad-attributed sales are a subset of total sales, so the ACoS denominator is smaller. If ACoS appears lower than TACoS, the two figures are probably using different date ranges or attribution windows. Check the reporting period first.
What is a good ACoS for Amazon?
There is no universal good ACoS. It depends on your margin before ad spend. A 15% ACoS is healthy for a high-margin product and unprofitable for a low-margin one. Calculate break-even ACoS from your own cost sheet, then set targets below it.
If your ACoS and TACoS are telling different stories and you are not sure which to trust, talk to Techtwist and we will walk through the numbers with you.
