Amazon Ads Lawsuit: How the Alleged Surcharge Worked

Key takeaways

• The FTC and 22 states allege Amazon Ads secretly inflated prices in search-ad auctions used by more than 1.2 million advertisers.
• The complaint says a hidden “soft reserve price” made advertisers pay their full bid far more often than a disclosed second-price auction would.
• Amazon rejects the allegations, says relevance improved results, and estimates its model saved advertisers more than $8 billion from 2021 to 2025.
• The case is unresolved. Its biggest practical question is whether digital marketplaces must reveal enough auction data for advertisers to verify the price they paid.

Amazon Ads is facing a new federal and multistate lawsuit over how it priced sponsored search placements. The Federal Trade Commission’s August 31 complaint, joined by 22 state attorneys general, alleges that Amazon inserted undisclosed surcharges into auctions while continuing to describe them as second-price auctions. Amazon says that account is wrong and that its relevance-based system improved value for advertisers.

The case is not a finding that Amazon broke the law. It is a set of allegations filed in the US District Court for the Western District of Washington, and Amazon will be able to answer them. What makes the dispute important is the mechanism: millions of small businesses buy Amazon Ads inside a marketplace where the platform controls the auction, the search page and most of the data needed to audit the bill.

What does the Amazon Ads lawsuit allege?

The FTC says Amazon represented Sponsored Products auctions as generalized second-price auctions. Under that model, the winning advertiser does not normally pay its own maximum bid. It pays the minimum needed to beat the next eligible competitor, adjusted for the platform’s ranking rules.

According to the 181-page complaint, Amazon began using an undisclosed “soft reserve price” in 2019. Regulators allege that this internal, platform-created price acted like an extra bidder and lifted the amount charged above the price produced by advertiser competition. The FTC calls the result a secret surcharge; Amazon disputes both the description and the claimed harm.

In plain terms, the Amazon Ads lawsuit asks whether a marketplace can tell advertisers they are in a second-price auction while using a hidden platform-set value that frequently pushes the winner’s charge up to its own bid. If that description is proven, the problem is not merely a high ad price; it is that advertisers may have chosen bids using incomplete information about the auction.

Why the auction type changes advertiser behaviour

Advertisers do not bid in a vacuum. A business that expects a genuine second-price auction may submit something close to the maximum value of a click because it expects to pay only enough to beat the next competitor. In a first-price auction, where the winner pays its own bid, experienced advertisers often reduce or “shade” bids to avoid overpaying.

The FTC alleges that Amazon benefited from advertisers continuing to behave as if a second-price system was operating. Its complaint says the share of Sponsored Products auctions in which advertisers paid their own bid rose from roughly 30%–40% in 2021 to about 70% in 2022 and approximately 80% in 2024. Those figures are allegations drawn from the regulator’s evidence and have not been adjudicated.

The complaint also alleges that surcharges rose around high-volume events such as Prime Day and Black Friday. That matters for sellers because peak days combine larger traffic, more aggressive bids and tighter inventory decisions. A small percentage difference can become material when repeated across millions of clicks.

Question	FTC and states	Amazon’s response
How was the auction described?	Advertisers were led to expect a generalized second-price auction.	The FTC oversimplifies a relevance-based auction and selected internal discussions.
What set the final price?	An undisclosed soft reserve or proxy bid allegedly increased prices.	Pricing and relevancy jointly improve advertiser and shopper outcomes.
Was there harm?	More than 1.2 million advertisers allegedly overpaid; regulators say the total reached tens of billions of dollars.	Amazon estimates advertisers saved over $8 billion during 2021–2025 and says conversion improved.
What is requested?	Injunctions, monetary relief, penalties, disgorgement and restitution.	Amazon says it will defend the case.

Amazon says relevance—not a hidden fee—explains the model

In its official response, Amazon calls the lawsuit misguided. The company argues that choosing ads only by the highest bid would reduce relevance for shoppers. It says average Sponsored Products cost per click was flat after inflation from 2019 through 2024, while conversion rates rose 24% from 2021 to 2025.

Amazon also estimates that advertisers saved more than $8 billion between 2021 and 2025 because the platform prioritised relevance instead of simply accepting the highest bid. For 2026, it forecasts at least 58% higher advertiser sales and 46% better return on ad spend under its approach. Those are company estimates, not independent findings, and the litigation will test whether they answer the disclosure allegations.

The two sides are therefore arguing about related but different questions. Amazon focuses on overall results and the value created by relevancy. Regulators focus on what advertisers were told, what information was withheld and whether the final charge matched the auction description. A system can produce useful ads and still face a disclosure dispute; equally, unusual pricing is not illegal merely because it is complex.

How large is the alleged Amazon Ads impact?

The FTC says more than one million brands and sellers were affected, including over 500,000 small and medium-sized businesses. The New York attorney general, one of the state plaintiffs, puts alleged overcharges above $20 billion. The complaint does not establish that figure as a final damages award.

Associated Press reported that the action covers about 1.2 million advertising customers. Amazon’s advertising services generated $68.6 billion in 2025, according to reporting cited by Axios, which shows why auction design has become central to the economics of the marketplace. Sellers often pay Amazon both transaction-related fees and advertising costs to remain visible in crowded search results.

What sellers and advertisers should do now

The lawsuit does not require advertisers to stop Amazon Ads, and no court has ordered refunds. Businesses can, however, improve their own evidence. They should preserve campaign exports, invoices, bid histories and correspondence; compare cost per click with conversion and contribution margin; and note unexplained changes around major sales events.

Advertisers should also test whether lower bids materially change placement and sales rather than assuming the platform’s recommended bid is optimal. The broader lesson resembles the pricing question in Europe’s scrutiny of large digital platforms: transparency rules become more important when the platform owns both the marketplace and the measurement layer.

For Indian sellers advertising to US shoppers, the case is relevant even though it was filed in the United States. Cross-border brands buy the same sponsored placements, and any future disclosure or reporting remedy could change how campaign managers see auction prices. It is too early to assume that monetary relief, if any, would extend to every foreign advertiser.

What happens next in the Amazon Ads case?

Amazon can move to dismiss some claims, answer the complaint, seek discovery and challenge the regulators’ economic analysis. The plaintiffs will have to prove both the factual mechanism and the legal elements of deception or unfairness. The court could eventually order changes, damages or no relief at all.

A settlement could require clearer auction descriptions, greater access to price data, restrictions on undisclosed reserves or payments to affected advertisers. A trial and appeals could take years. Until the court tests the record, readers should treat “soft reserve,” surcharge amounts and advertiser harm as allegations, and Amazon’s savings and performance figures as the company’s defence.

Everyone else is reporting a new lawsuit; the useful question is what the auction description allowed advertisers to infer. If the case forces large ad marketplaces to expose the inputs behind a final charge, its effect could reach beyond Amazon to retail media networks, app stores and other platforms that sell visibility inside environments they control.

FAQs

What is the Amazon Ads lawsuit about?

The FTC and 22 states allege Amazon used an undisclosed soft reserve price to inflate sponsored-search auction charges while describing the system as a second-price auction. Amazon denies misleading advertisers and says its relevance-based model improved value.

Did a court find that Amazon overcharged advertisers?

No. The case was filed on August 31, 2026, and the claims have not been adjudicated. Dollar amounts discussed by regulators are allegations, not a final judgment.

Does the lawsuit affect Amazon sellers immediately?

There is no immediate court-ordered change. Sellers can preserve records, audit total advertising costs and monitor the case for future disclosure rules or monetary relief.

How does Amazon defend its ad auction?

Amazon says the FTC misunderstands a system that combines bids with ad relevance. It argues that advertisers gained better conversion, return on ad spend and billions of dollars in estimated savings.