Amazon top of search bid adjustment: how to set the percentage from margin

1. 1Read the placement report

   Conversion rate per placement, 100+ clicks each

2. 2Price each click

   Price x conversion rate x target ACoS

3. 3Lower the base bid

   Set it to the weakest placement's target

4. 4Calculate the percentage

   Target CPC / base bid, minus one

5. 5Check the ceiling

   Highest bid must sit under break-even CPC

What the Amazon top of search bid adjustment does

Every Sponsored Products campaign has a bid adjustments setting. You enter a percentage for a placement, and Amazon lifts your keyword or target bid by that amount whenever the ad is eligible for that placement. A $1.00 bid with a 50% top of search adjustment bids up to $1.50 for the top row of page one and stays at $1.00 everywhere else.

Three rules matter before any math. The setting is campaign level, so every keyword in the campaign gets the same lift. The range is 0% to 900%, which means the adjusted bid can be ten times the base bid. And there is no negative adjustment: you cannot bid less for a placement, you can only bid more for the others.

• Top of search (first page): the first row of sponsored results on page one
• Rest of search: adjustable since January 9, 2024, when Amazon added it for all targeting types and bidding strategies
• Product pages: sponsored slots on detail pages
• Amazon Business: a separate field for eligible campaigns, per Seller Labs

How the adjustment stacks with dynamic bidding

The placement adjustment is applied first. The campaign bidding strategy is applied second, on the already adjusted bid, so the two multiply.

With fixed bids, the adjusted bid is the ceiling. With dynamic bids down only, Amazon can lower the adjusted bid but never raise it. With dynamic bids up and down, Amazon can raise the adjusted bid by up to 100% when it judges a click likely to convert. Emplicit and PPC Land both show the extreme case: a $1.00 bid with a 900% adjustment and up and down bidding resolves to a theoretical $20.00 per click.

• Fixed bids: ceiling is base bid x (1 + adjustment)
• Down only: same ceiling, Amazon can only go lower
• Up and down: ceiling is base bid x (1 + adjustment) x 2

What is different in 2026

Much of what ranks for this topic was written in 2019 or 2020. Helium 10's guide and Ad Badger's 2020 walkthrough describe only two adjustable placements, because rest of search could not be adjusted until 2024.

PPC Land's Sponsored Products explainer from September 2026 reports that up and down bidding now raises bids by up to 100% in every placement, where earlier documentation capped the increase at 50% outside top of search. Check the help text in your own console.

As we covered in our report on the November 11 placement report change, the rest of search row is now labelled Other on-Amazon and there is a fourth row, Off Amazon, for creator placements. Seller Sphere found that placement adjustments do not apply to off-Amazon serving, so your base bid is what buys those clicks.

The FTC and 22 states sued Amazon on August 31, 2026 over how Sponsored Products clicks are priced. PPC Land reports the complaint alleges that the share of clicks charged the advertiser's full bid rose from about 4% in late 2020 to 79.1% in 2024. Amazon denies the claims. For planning, assume you may pay close to your adjusted bid, so the ceiling has to be a price you can live with.

The gap in most guides: set the percentage from margin

The common advice is to open the placement report, find the placement with the lowest ACoS and raise it in steps of 25% to 50%. That nudges a setting. It does not tell you where to stop, or whether the click is still profitable at the new price.

Several guides repeat that top of search converts two to four times better than other placements. None of the ones we read gives a dataset, so check your own report instead of bidding on that claim.

A better method starts from what one click is worth in each placement: price multiplied by conversion rate. Multiply that by target ACoS for the most you should pay, and by break-even ACoS, your margin before ad spend, for the price above which every sale loses money. Our guide to a good ACoS for Amazon covers how to set both.

• Target CPC per placement = price x placement conversion rate x target ACoS
• Break-even CPC per placement = price x placement conversion rate x break-even ACoS
• Base bid = target CPC of your weakest placement
• Adjustment % = (target CPC of the placement / base bid - 1) x 100
• If up and down bidding is on, halve the target CPC before you calculate

A worked example with illustrative numbers

These numbers are illustrative, not from a real account. Take a $30 product with a 30% margin before ad spend, so break-even ACoS is 30%. The target ACoS is 25%. The 60 day placement report for an exact match campaign shows conversion rates of 15% at top of search, 6% in rest of search and 4% on product pages.

Target CPC at top of search is $30 x 15% x 25% = $1.13. Rest of search is $30 x 6% x 25% = $0.45. Product pages is $30 x 4% x 25% = $0.30. Break-even CPC at top of search is $30 x 15% x 30% = $1.35.

The base bid becomes $0.30, the product pages figure. Rest of search needs $0.45, so its adjustment is (0.45 / 0.30 - 1) x 100 = 50%. Top of search needs $1.13, so its adjustment is (1.13 / 0.30 - 1) x 100, or about 275%.

Now check the ceiling. On fixed bids or down only, the most you can pay at top of search is $1.13, under the $1.35 break-even. Switch the same campaign to up and down and the ceiling doubles to $2.25, which is 67% above break-even. To keep up and down, halve the top of search target to $0.56, which gives an adjustment of about 88%.

Compare that with a seller who keeps a $0.75 base bid and adds 100%. Top of search bids $1.50, over break-even, and product pages bid $0.75 against a $0.30 target. The adjustment was not the problem. The base bid was.

Steps to set and test the adjustment

Run these on one campaign first.

• Ads manager: in the Amazon Ads console under Measurement and reporting, download the Sponsored Products Placement report for the last 60 days. Metric: at least 100 clicks per placement in the campaign before you trust its conversion rate.
• Finance or brand owner: confirm margin before ad spend for each product from Seller Central fees and landed cost. Metric: a written break-even ACoS and target ACoS per product group.
• Ads manager: in a spreadsheet, calculate target CPC and break-even CPC per placement with the formulas above. Metric: every placement has a target that sits below its break-even.
• Ads manager: in the campaign's bid adjustments settings, lower base bids to the weakest placement's target and enter the calculated percentages, with the bidding strategy on fixed or down only for the test. Metric: the highest possible top of search bid is below break-even CPC.
• Ads manager: leave it alone for two weeks, then rerun the placement report. Metric: top of search share of spend is up, campaign ACoS is at or under target, and total orders have not fallen.
• Account owner: check TACoS and organic rank on the main keyword in Seller Central business reports and your rank tracker. Metric: TACoS flat or lower while ad sales grow, which shows the extra top of search sales are not just replacing organic ones.

Mistakes to avoid, and when this advice does not apply

The margin method does not fit every campaign. A launch campaign buying rank on purpose will bid above break-even at top of search for a fixed period, and that is a decision, not an error, as long as the budget and end date are written down. Campaigns with fewer than 100 clicks per placement should start at 0% and wait. Low priced products with thin margin often cannot afford top of search at any percentage. And if product pages is your strongest placement, which happens with accessories and refills, adjust product pages instead.

• Mixing branded and generic keywords: Ad Badger points out that branded terms inflate top of search results and push the percentage too high for everything else.
• Raising the adjustment without lowering the base bid: every other placement, including off-Amazon serving, keeps paying the old price.
• Boosting a keyword you already rank first for organically: IG PPC warns that a heavy premium can pay for sales you would have had anyway.
• Boosting a product that is about to stock out: more clicks only bring the stock-out date forward.

How PPC Spider handles placement bids

PPC Spider sets every target ACoS from product margin after fees, so each campaign gets a profit-capped ceiling before any placement percentage is entered. SpiderOS, our AI platform, monitors bids, budgets, search terms and stock 24x7 and changes them only when the data shows a product is off its profit target.

Amazon PPC management is a flat monthly retainer, never a percentage of ad spend: Launch at $995 a month for up to $10k of monthly ad spend, Growth at $1,250 for up to $40k and Scale at $2,200 for up to $120k, with a 90-day initial term. A free Amazon audit shows how your current placement settings compare with your margin, and our guide to Amazon PPC bidding strategies covers fixed and dynamic bids in more depth.

Sources

• Amazon Ads: Rest of Search Bid Adjustment for Sponsored Products, January 9, 2024 (advertising.amazon.com)
• PPC Land: Amazon Ad Lab names four bidding metrics, October 18, 2026 (ppc.land)
• Emplicit: Amazon Placement Bid Adjustments Explained, May 26, 2026 (emplicit.co)
• Seller Labs: Placement Bid Adjustments, updated July 30, 2026 (sellerlabs.com)
• Ad Badger, March 18, 2020 (adbadger.com); Perpetua, February 27, 2019 (perpetua.io); Helium 10, November 4, 2020 (helium10.com); IG PPC (igppc.com)

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