How do Amazon PPC bid adjustments work?
Bid adjustments let you multiply your base bid by placement (top of search, rest of search, product pages) and by audience segment. Top-of-search adjustments often move ACoS the most: raising the top-of-search modifier by 50% on a winning campaign can add 20%+ in sales at similar efficiency. Product page adjustments rarely pay off outside of ASIN targeting.
The three placements
Top of search: the first row of results. Highest CTR and conversion. Rest of search: results further down. Lower CTR. Product pages: your ad shows on other listings. Lower CTR still, but strong for ASIN targeting against competitors.
Which adjustments actually work
Top-of-search adjustments (+25% to +100%) on proven campaigns almost always add profitable volume. Product-page adjustments only help on Sponsored Products with explicit competitor ASIN targeting. Rest-of-search adjustments rarely need touching.
Bid strategies (up/down vs fixed)
Fixed bids: what you set is what you pay. Dynamic bids down only: Amazon can cut in real time on low-conversion impressions. Dynamic bids up and down: Amazon can raise up to 100% on high-conversion impressions. Start with 'down only' for launch, move to 'up and down' once conversion data stabilises.
Frequently asked questions
Should I use dynamic bids up and down?
Only on campaigns with 60+ days of conversion history. Otherwise Amazon overspends on immature signals.
How high can the top-of-search modifier go?
Up to +900%, but the practical sweet spot is +25% to +100% on profitable campaigns.
Do bid adjustments compound?
Yes. A +50% top-of-search modifier on a $2 base bid with dynamic bids up and down at +100% can push the actual paid bid to $6.
Where is this in Ads console?
In the campaign settings under 'Bidding strategy' and 'Placement bid adjustments'.
See this in Nova
Nova surfaces this metric per SKU in near real time so you can act before your next monthly close catches it.
Try Nova free for 14 daysRelated questions
What is a good ACoS for Amazon PPC?
A good ACoS on Amazon depends on your target margin. Break-even ACoS equals your pre-ad contribution margin (usually 25% to 40%). Profitable ACoS sits 5 to 10 points below that: most private-label brands aim for 15% to 25%. Launch campaigns often run at 40% or higher for the first 30 days on purpose.
How do I audit wasted Amazon ad spend?
A 30-minute weekly audit catches most wasted PPC spend. Pull the search term report for 14 days, negative-out any term with 10+ clicks and zero orders, cut bids on keywords with ACoS 2x above target, and pause any SKU whose product-level ad spend exceeds its net profit for the period.
Sponsored Brands vs Sponsored Products: which should I run first?
Sponsored Products first, every time. SP drives direct sales on ready-to-buy queries and gives the fastest read on unit economics. Sponsored Brands adds top-of-funnel brand exposure and store traffic but usually shows a longer payback and needs SP data first to know which keywords deserve the SB budget.
Is dayparting worth it on Amazon ads?
Dayparting (adjusting bids by hour or day) helps most on Sponsored Products campaigns spending $50+/day where conversion rate varies more than 30% across the day. For most sellers under $30/day, dayparting adds complexity without meaningful savings. Use hourly rules only after basic negatives and bid adjustments are dialed in.
How do I lower TACoS on Amazon?
Lower TACoS by growing organic sales faster than ad spend. The three levers that move it most are: cut wasted ad spend on non-converting search terms, raise listing conversion rate so ads earn more per click, and build organic rank on branded and long-tail keywords so you buy less of your own traffic.