How to Lower Your ACoS (and When Not To)

ACoS, your advertising cost of sale, is the share of ad revenue you spend on ads. A high ACoS means your ads are eating your profit, so lowering it is one of the most common goals in Amazon PPC. But lower isn't always better, and chasing it blindly can cost you more than it saves.

Most high ACoS comes from paying for clicks that don't convert. Find and cut those first.

• Irrelevant search terms. Read your search-term report and add terms that get clicks but no sales as negative keywords, so you stop paying for them.
• Bids set too high. If you're winning clicks at a cost the sale can't cover, lower the bid. You'll lose some volume, but the sales you keep will pay.
• Broad targeting you haven't pruned. Broad match finds new terms, which is useful, but it needs regular weeding or it wastes spend on loose matches.
• A listing that doesn't convert. If clicks come but sales don't, the problem may be the listing, not the bid. No amount of PPC tuning fixes a page that doesn't sell.

Lower ACoS by improving efficiency, not by slashing bids across the board. Shift budget toward the keywords and campaigns that already convert, pull it back from the ones that don't, and keep feeding proven terms from your automatic campaigns into tightly targeted manual ones. The aim is to spend the same money on better clicks, not to spend less and disappear.

Sometimes you want a high ACoS on purpose. On a launch, sellers often accept a painful ACoS to win sales velocity and organic rank, knowing that rank brings cheaper organic sales later. This is where TACoS matters: it measures ad spend against your total revenue, organic included, so a high ACoS with a healthy and falling TACoS usually means your ads are buying real, lasting growth. Judge advertising by whether it's building the whole product, not by ACoS alone.