Understanding & lowering TACoS on Amazon

Most sellers manage their Amazon advertising via ACoS. That's not wrong, but it's incomplete – and it often leads to decisions that look good in the short term and cost you revenue in the long run. The more meaningful metric is called TACoS. Once you understand it, you can tell whether advertising is genuinely moving the product forward or just buying revenue at a high price.

What TACoS means.

TACoS stands for Total Advertising Cost of Sales: ad spend divided by the total revenue of a product – that is, ad sales plus organic sales. Example: £1,000 in ad spend against £10,000 in total revenue gives a TACoS of 10%.

The difference from ACoS is crucial. ACoS looks only at the ad-driven share: if the same £1,000 in ad spend produces £4,000 in ad sales, the ACoS is 25%. Both figures are correct – but they answer different questions.

MetricAnswersPerspective

ACoSHow efficient is my advertising?Campaign level

TACoSHow dependent is my product on advertising?Product level

ROASHow much revenue per advertising pound?Campaign level, inverse of ACoS

Why TACoS is the better metric to steer by.

Picture two products, both with an ACoS of 25%. For product A the TACoS is 22% – almost all the revenue comes through advertising. For product B the TACoS is 7% – the vast majority of sales happen organically, advertising only tops it up.

Product B is healthy: it ranks, it sells by itself, advertising opens up extra volume. Product A, on the other hand, collapses the moment you switch the campaigns off. ACoS alone would never have shown this difference.

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The most important movement: Revenue rises, TACoS falls. It means organic sales are increasing and advertising has to carry proportionally less. That's exactly what we optimise for in our management work.

Which TACoS is good?.

Blanket target values are dangerous, because margin, category and product phase vary enormously. As a rough guide:

PhaseTACoS rangeTarget

Launch25–40 %Buy visibility and first sales, build up ranking

Growth12–20 %Consolidate rankings, open up new search terms

Established5–12 %Hold position, fend off competitors, maximise margin

ClearancevariableClear stock – here TACoS is deliberately secondary

More important than the absolute value is how it develops over time. A TACoS of 18% that has been falling for three months is a better sign than a TACoS of 11% that has been rising for three months.

Five levers to lower your TACoS.

Build organic rankings

The single most effective lever: every position you win organically permanently reduces your need for advertising. An optimised listing, clean keyword coverage, good reviews – all of that works for you permanently, without click costs.

Improve the conversion rate

When 100 clicks turn into 12 purchases instead of 8, your cost per sale drops by a third – without you touching the bids. The main image, price, reviews and A+ Content are the levers here.

Exclude unprofitable search terms

In every ad account there are terms that eat clicks and never sell. Exclude them as negatives regularly – that saves budget immediately without losing revenue.

Steer bids by ranking position

For search terms where you rank 1 to 3 organically, you often need less aggressive bids. The budget moves instead to terms where you aren't yet visible organically.

Secure your stock

Going out of stock costs twice over: the revenue disappears, and the hard-won rankings deteriorate. Once you're back in stock, advertising has to help out expensively, which pushes the TACoS up for weeks.

Common mistakes in TACoS management.

Slashing advertising drastically because the TACoS looks too high. If visibility drops, the organic rankings fall too – the TACoS gets worse afterwards, not better. You reduce advertising gently and keep an eye on the rankings as you go.

Looking at TACoS averaged across all products. A launch product at 35% and an established one at 6% average out to 20% – a figure that tells you nothing. Always assess per product.

Optimising for ACoS only. If you push the ACoS down at any cost, you often switch off exactly the campaigns that create visibility for new search terms – and then you stagnate.

How we work with it.

In unserer PPC-Management we evaluate TACoS per product and per week – not per campaign. Our own AISellercore continuously adjusts bids and flags when a product's TACoS drifts out of the target corridor. That way we spot problems in days rather than months.

And we'll tell you honestly when advertising isn't the problem: sometimes a high TACoS isn't down to the campaigns but to a weak main image, too high a price or missing reviews. In that case we work on that first.

Frequently asked questions.

What's the difference between ACoS and TACoS?

ACoS relates ad spend only to the revenue generated through advertising. TACoS relates it to total revenue – that is, including organic sales. This means TACoS shows how dependent your product is on advertising overall.

What is a good TACoS?

It depends on the phase and the margin. At launch 25–40% is normal, in the growth phase 12–20%, for established products 5–12%. What matters is the trend: a falling TACoS alongside rising revenue is the goal.

Why is my TACoS suddenly rising?

Common reasons: more competition and therefore higher click prices, a loss of ranking on a main keyword, out-of-stock periods, or a drop in conversion rate after listing or price changes.

Can TACoS be too low?

Yes. A very low TACoS can mean you're leaving growth potential on the table – your product runs organically, but you're no longer opening up new search terms or new customers.

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Understanding and lowering TACoS: the most important advertising metric on Amazon.