What is TACoS?

TACoS (total advertising cost of sale) is your ad spend expressed as a percentage of all your sales, organic and ad-attributed together. Where ACoS asks what the ad-driven sales cost, TACoS asks how much of the business's total revenue goes to advertising.

The difference is the denominator. ACoS divides spend by the sales Amazon credits to an ad click. TACoS divides the same spend by every sale in the period, including sales from organic search, from repeat customers, and from any organic visibility your advertising helped to earn. To do that it combines two data sources: spend from your advertising reports and total sales from your seller account.

The formula

TACoS = Ad Spend ÷ Total Sales × 100
      = ACoS × (Ad-Attributed Sales ÷ Total Sales)

The second line is the one to remember. TACoS is ACoS scaled by the share of your sales that came through ads, so it can move for two different reasons: the ads became more or less efficient, or the organic share of sales changed.

Worked example

The figures below are example inputs chosen for round arithmetic. They are not taken from any account.

Suppose that in one month a brand spends $2,000 on ads, Amazon attributes $8,000 of sales to those ads, and total sales across the brand are $20,000.

• ACoS = $2,000 ÷ $8,000 × 100 = 25%
• Share of sales from ads = $8,000 ÷ $20,000 = 40%
• TACoS = $2,000 ÷ $20,000 × 100 = 10%, which is 25% × 40%

Now suppose the next month's spend and attributed sales are unchanged, but total sales rise to $25,000. ACoS is still 25%. TACoS falls to $2,000 ÷ $25,000 = 8%. Nothing changed in the ad account, so the ads alone do not explain the drop. A price change, a seasonal lift or a new batch of reviews could produce the same movement.

Set your own TACoS ceiling

A TACoS target should come from your margin, the same way a break-even ACoS does. Start from contribution margin before advertising, as a share of total sales. If advertising is the only cost between that margin and what you want left over, then:

Max TACoS = Contribution Margin % − Profit % to keep after ads

Example inputs: total sales of $20,000 leave $7,000 of contribution margin before advertising, which is 35%. To keep at least 15% of sales, or $3,000, after advertising, TACoS can be at most 35% − 15% = 20%. That is an ad budget of up to $4,000 at this level of sales. Spend beyond it eats into the margin you set aside.

Check the arithmetic for any month with the TACoS calculator.

How to use TACoS to make decisions

Read it as a trend, next to its parts. One month's TACoS says little on its own. Track it alongside total sales and the share of sales from ads. Falling TACoS with rising total sales and steady spend is the pattern sellers hope advertising produces. Falling TACoS because spend was cut, while total sales fell too, is a different story behind the same headline number.

Use it as the guard rail for a deliberate push. A launch or a ranking push can run an ACoS above break-even on purpose. TACoS shows what that push costs the whole business, and your ceiling tells you when to stop or scale back. Set the ceiling and an end date before the push begins.

Test the organic effect instead of assuming it. That advertising lifts organic sales is plausible, but it is not guaranteed for any given product. If you raise spend and want to know whether organic sales followed, compare organic sales (total sales minus ad-attributed sales) before and after over settled windows of the same length, and check organic rank for the search terms you pushed.

Common mistakes

• Copying a benchmark. A TACoS that is healthy for a high-margin product can be ruinous for a thin one. Use the ceiling above, built from your own margin.
• Mismatched scopes. Account-wide ad spend divided by one product's sales, or Sponsored Brands spend that covers several products divided by the sales of one of them, gives a meaningless ratio. Keep spend and sales on the same products and the same dates.
• Mismatched revenue bases. Total sales before refunds and promotions give a lower TACoS than revenue after them. Both are valid. Pick one and label it.
• Ignoring tax. Where listed prices include VAT, check whether each figure includes it before dividing one by the other.
• Crediting ads for every organic gain. TACoS falls when total sales rise for any reason, including reasons that have nothing to do with advertising.
• Reading the split on fresh days. Amazon reports ad sales on the date of the click, and attribution for a date stays incomplete until the lookback window has ended (Amazon Ads attribution help, checked 2026-10-03). Until then, the latest days overstate the organic share. See attribution window.

How TACoS relates to other metrics

How Shurq helps

• TACoS on the dashboard by default. TACoS is one of the four default tiles on Shurq's dashboard cards, next to Orders / Units, PPC Spend and PPC Sales.
• TACoS and ACoS by marketplace and product. The dashboard tables show both for each marketplace, parent ASIN and child ASIN.
• Gross and net, with the split beside them. The profit and loss view reports TACoS against total sales and against revenue after promotions and refunds, with rows for the share of sales from ads and from organic. The same view carries the contribution margin rungs (CM1 to CM3) that the ceiling above is built from.