How to lower ACOS on Amazon without losing sales

A high ACOS is rarely one problem. It is usually a few searches that never sell, bids set from one account-wide target instead of each product's margin, budgets spent in the wrong places, and listings that lose the click or the sale. Here is the order to fix them in, from the quickest win to the slowest.

1. Know your break-even ACOS per product

Before lowering anything, know what each product can afford. Break-even ACOS is profit per unit before ads divided by the price. A $30 product that leaves $9 before ads breaks even at 30% ACOS; one that leaves $4 breaks even at 13%. One account target of 25% over-spends on the second product and under-spends on the first. Set a target below each product's break-even ACOS, by the profit you want to keep. The break-even ACOS calculator does the arithmetic.

2. Stop the searches that never sell

Open the search term report for the last 30 to 60 days and sort by spend. Searches with enough clicks and no orders (many sellers use 10 to 15 clicks, or the cost of one order at target ACOS) become negative exact keywords. Then look at single words across many searches: words such as "free", "cheap", a size you don't sell or a competitor's brand often waste money in dozens of searches at once, and one negative phrase stops them all. This is usually the fastest ACOS improvement in an account.

3. Move bids toward the target, in steps

For keywords with enough clicks to judge, raise bids where ACOS is well under target and lower them where it is over, part of the way at a time so bids do not swing. Leave out the last two or three days: Amazon credits a Sponsored Products sale to an ad up to 7 days after the click, so recent days always look worse than they are. Keywords with very few clicks need time or a small raise, not a cut.

4. Harvest winners into exact match

Automatic and broad campaigns find searches you would not have thought of, but they share one bid across all of them. Move searches with two or more orders at or under target into an exact-match campaign with their own bid, and add them as negatives where they came from so the two campaigns do not compete. Read more about search term harvesting.

5. Check placements

Compare ACOS for top of search, rest of search and product pages. If top of search sells far better, a placement adjustment there is cheaper than raising every bid; if product pages waste money, lower or remove their adjustment.

6. Fix what ads cannot

Ads bring the click; the listing makes the sale. If a keyword gets clicks at a fair CPC but converts poorly, look at the price, the main image, reviews and whether the product has the Buy Box. Pause ads for products that are out of stock or without the Buy Box: those clicks cannot convert. Fix listing errors and missing images first; they cost conversion on every click.

7. Watch TACOS, not only ACOS

Cutting bids always lowers ACOS, and can also cut sales and organic rank. TACOS (ad spend ÷ all sales) shows the whole picture: if ACOS falls and TACOS falls while total sales hold, you won; if total sales drop, you cut too deep. Use the ACOS and TACOS calculator to track both.

A weekly routine

• Monday: search term review, negatives and harvesting.
• Wednesday: bid changes on keywords with enough data; placement check.
• Friday: stock and Buy Box check before the weekend; budgets for winners that run out.
• Monthly: break-even ACOS per product after cost or fee changes.

SellerPilot runs these steps every morning as suggestions with their reasons, or as an autopilot inside your guardrails.