When Should I Use Rest of Search Bid Adjustment?
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Quick answer
Rest of Search bid adjustment is a placement-level bid modifier in Amazon Ads that changes how competitive a campaign is for search placements beyond top-of-search and product pages. It becomes worth using when account data shows those non-top placements are producing high wasted spend or low conversion relative to top-of-search placements. In that situation, a negative or reduced Rest of Search adjustment can redirect budget toward placements that are converting more efficiently.
Amazon gives you the option to adjust bids by placement, but the Rest of Search setting is easy to ignore. If your reports show solid top-of-search performance but weak results elsewhere, this is one of the most direct levers for tightening spend without pausing entire campaigns.
Signals That Support Rest of Search Adjustment
Adjust this lever when your placement or search term data shows a clear split: top-of-search clicks are converting, while rest-of-search placements are eating budget with low ROAS or no sales. Look for high click share outside top-of-search paired with poor conversion, or a rising ACoS on those placements over several days.
- Non-top placements account for meaningful spend but few orders
- Conversion rate on rest-of-search is consistently lower than top-of-search
- You are already using negative keywords but still see wasted spend
How to Validate the Decision Before Changing Bids
Do not make the change based on a single day. Use a consistent lookback window and compare at least a week of placement performance. An analytics tool like Amazon Negative Keyword Tool by Todoza can surface search terms and spend patterns across campaigns, making it easier to see whether the waste is coming from rest-of-search placements or from specific keywords that should be negated first.
The goal is to isolate placement behavior from keyword-level issues. If most of the waste comes from a small set of search terms, negating those terms may be a cleaner fix than adjusting the Rest of Search bid for the entire campaign.
When This Matters
This matters most for campaigns with limited daily budget or tight ACoS targets. If a campaign is profitable overall, a broad Rest of Search reduction may be unnecessary. But when every dollar of ad spend needs to work toward a target ACoS, controlling non-top placements can help reduce wasted spend quickly.
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Related guides
Rest of Search bid adjustment is not a set-and-forget setting. It is one part of a broader Amazon Ads strategy that should be reviewed alongside search term analysis, negative keyword management, and placement performance. For more on the timing and mechanics of Amazon Rest of Search bid adjustments, revisit the main guide.