When Amazon ACoS rises, cutting the daily budget is one possible response. But first check what changed: click costs, conversion, selling price, or the mix of products and search terms receiving spend. Each calls for a different response.
These five checks can help you find waste and decide where to keep investing. They do not guarantee lower ACoS or stable sales. Reducing spend can still be appropriate when a campaign exceeds the loss you can afford.
1. Set a target using your margin before advertising
Amazon defines ACoS as advertising spend divided by ad-attributed revenue, expressed as a percentage. There is no single target that suits every product or campaign.
For a product-level contribution break-even calculation, first subtract variable costs other than advertising from the selling price. Include product cost, applicable Amazon fees, fulfillment, and other variable costs such as expected returns. Divide what remains by the selling price.
Illustrative example, not a client result: a $30 sale with $21 in variable costs before advertising leaves $9, or a 30% contribution margin before ads. Spending $9 on advertising for that sale uses up the contribution. An ACoS below 30% leaves something toward fixed overhead and profit; it does not automatically mean the business is profitable.
Use comparable revenue and cost assumptions, and account for product mix when interpreting campaign totals. Net margin after advertising is not the input for this calculation.
Action: record the contribution margin and target ACoS for each advertised product. If you deliberately accept a loss during a launch or test, set a budget and review date for it. Our 90-day launch guide includes a related planning example.
2. Review search terms before adding targets or exclusions
Use the search-term reports available for your ad type to examine the queries receiving clicks and attributed orders. Amazon’s targeting guide explains keyword and negative targeting for Sponsored Products.
Look for relevant queries worth testing. A phrase such as “stainless steel insulated water bottle 32 oz” may describe the product closely. If it produces orders, consider testing it as an exact-match target with its own bid. One order does not prove low competition or predict future conversion.
Exclude irrelevant traffic, and investigate costly traffic. A query for a product you do not sell may warrant a negative. For relevant queries with no orders, assess spend, click volume, your economics, and the report’s attribution window before deciding. Ten clicks or a fixed conversion-rate cutoff is not a universal stopping rule.
Choose negative exact or negative phrase carefully. A broader exclusion can block useful queries as well as wasteful ones. Record what you changed and review the effect after enough new data accumulates.
3. Separate different shopping intentions where it helps decisions
Brand-name, generic category, and competitor searches can serve different purposes. A blended result may hide that one group uses much more budget for each attributed sale.
Consider separate campaigns or reporting groups when the volume supports them:
- Branded: searches for your own brand and products. Assess cost and contribution rather than assuming all branded sales are incremental.
- Generic: category and product-feature queries. Set bids against relevance, observed performance, and product economics.
- Competitor: searches or product targets involving alternatives. Define the test budget and success criteria before spending.
There are no conversion-rate ranges that apply reliably to all three groups. Separation makes performance easier to evaluate; it does not itself improve ACoS. Avoid splitting a small account so finely that each group has too little data to assess.
4. Check listing conversion before raising bids
If relevant clicks do not produce orders, inspect the offer and listing alongside the advertising. Review price, availability, delivery promise, imagery, copy, and recurring concerns in customer reviews.
Illustrative arithmetic: suppose 100 ad clicks cost $100 and each order produces $30 in attributed revenue. Eight orders produce $240 revenue and about 41.7% ACoS. Twelve orders produce $360 and about 27.8% ACoS. That is a one-third reduction in ACoS, assuming click costs, order value, and attribution stay unchanged. It is not a predicted result from a listing redesign.
Questions to review:
- Does the main image clearly show the product and comply with Amazon’s requirements?
- Do the title and bullets explain the product’s distinguishing features accurately?
- Are dimensions, compatibility, ingredients, or other purchase-critical details easy to find?
- Does A+ content answer useful questions instead of repeating the bullets?
- Do reviews reveal misunderstandings you can address honestly in the listing?
Treat listing changes as hypotheses to assess. Conversion can also change because of price, seasonality, competitors, or traffic mix, and listings need ongoing upkeep.
5. Review placement bids and scheduling carefully
For Sponsored Products, compare the placement metrics available in your account, including top of search, rest of search, and product pages. Do not assume one placement always converts better or costs less.
Amazon’s placement guidance explains the controls and reporting. Placement adjustments can increase bids for selected placements. Reducing an existing uplift is different from applying a negative adjustment. Review the base bid, bidding strategy, and other modifiers together before changing them.
If you use scheduling controls or a connected tool, check what it actually changes and whether you have enough repeated observations to support the decision. Recent attributed sales may be incomplete. A weak-looking hour is not sufficient evidence to switch advertising off every day at that time.
What to do next
Keep a simple change log: the issue, the evidence, the adjustment, the date, and the next review. Compare ACoS with attributed sales, total account sales, spend, and contribution. A lower ratio alone does not establish a better business outcome.
If you need a team to carry out these reviews, explore our Amazon PPC management service for scope, starting fees, and the information we need to review your advertising.