Amazon Sellers, Watch Your Ad Spend: What the FTC’s $20 Billion Allegation Means for Your Business

Amazon sellers and side-hustlers have a new reason to examine their advertising reports.

On August 31, 2026, the Federal Trade Commission and 22 state attorneys general filed a lawsuit against Amazon in the U.S. District Court for the Western District of Washington. The complaint alleges that Amazon secretly changed how its digital advertising auctions were priced, causing advertisers to pay more than they should have under the auction system Amazon described.

The FTC and states claim the alleged conduct extracted more than $20 billion from advertising customers since 2019. That figure is an allegation in a complaint, not a court-approved finding or confirmed refund amount.

For sellers who rely on Sponsored Products, Sponsored Brands, or Display Ads, the case is a reminder that advertising is not just a marketing expense. It is a cash-flow decision that can determine whether a product is profitable.

What happened in the FTC’s Amazon advertising lawsuit?

The complaint focuses on Amazon’s digital advertising auctions. Sellers bid for ad placements that appear alongside search results on Amazon’s website and mobile app.

According to the FTC, Amazon represented that its ads were sold through a generalized second-price auction. Under that model, the winning advertiser generally pays the minimum amount needed to beat the next-highest bidder, often described as one cent more than the second-highest bid.

The FTC alleges that Amazon changed this process beginning in 2019 by adding an undisclosed “soft reserve price” or surcharge. The complaint says this caused advertisers to pay substantially more than the price produced by the underlying auction.

The government further alleges that Amazon’s system increasingly caused advertisers to pay amounts close to their own winning bids. The FTC says the alleged surcharge affected more than one million advertising customers, including more than 500,000 small and medium-sized businesses.

Amazon disputes the government’s characterization of its advertising system. CNBC reported that Amazon called the lawsuit misguided and said the FTC misunderstood how advertisers operate. Amazon has not been found liable, and the company will have an opportunity to defend itself in court.

Why this matters to Amazon sellers and side-hustlers

Advertising can be one of the largest controllable expenses in an Amazon business. A seller may pay for product photography, inventory, fulfillment, storage, returns, software, and advertising before earning a meaningful profit.

Even a modest change in cost per click can have a significant effect.

Consider a simplified example:

• A seller earns $12 in gross profit before advertising on one product.
• The seller spends $4 to generate a sale through ads.
• The remaining contribution is $8 before other overhead.
• If advertising cost rises to $6 per sale, contribution falls to $6.

That is a 25% reduction in the money available to cover operating costs, taxes, owner compensation, or reinvestment.

The FTC’s allegations do not automatically show that every seller was overcharged or that every campaign was unprofitable. However, the case raises practical questions:

• Were your advertising costs rising because of greater competition, or because of changes in auction pricing?
• Did your bids increase while conversion rates stayed flat?
• Did high-volume shopping periods produce unusually expensive clicks?
• Were your advertising reports detailed enough to identify a pricing pattern?

For a small seller, the answer may affect whether a product remains worth carrying.

How the alleged auction issue could affect your numbers

The difference between a first-price and second-price auction matters because it changes bidding behavior.

In a basic second-price example:

• Your bid is $2.00.
• The next-highest qualifying bid is $1.20.
• Under the stated auction concept, you might pay approximately $1.21, subject to relevance and other platform rules.

In a first-price auction, the winning advertiser generally pays its own bid, or an amount much closer to it.

The FTC alleges Amazon represented one pricing model while using undisclosed mechanisms that pushed prices higher. The case will need to establish what Amazon promised, how the auction system actually operated, what advertisers knew, and whether the conduct violated federal or state law.

Sellers should not assume that a higher click price alone proves misconduct. Prices can change because of seasonality, product demand, competitors, conversion rates, category trends, and campaign settings.

The point is to examine your own data rather than react to headlines.

What Amazon sellers should do now

1. Audit your advertising history

Download and preserve your Amazon Ads reports, invoices, and campaign data. Review trends by:

• Campaign
• Product
• Keyword
• Date range
• Placement
• Cost per click
• Click-through rate
• Conversion rate
• Advertising cost of sales, or ACOS

Look for changes that do not match your business conditions. For example, if your bid remained stable but cost per click rose sharply while conversion performance stayed similar, document the period for further review.

Do not rely only on a current dashboard. Historical reports may be harder to retrieve later.

2. Separate advertising performance from product profitability

ACOS tells you how much advertising cost is associated with sales. It does not tell you whether the product is profitable by itself.

Use a fuller calculation that includes:

• Product cost
• Amazon selling fees
• Fulfillment and storage
• Returns and refunds
• Discounts and promotions
• Advertising
• Software and contractor costs
• Taxes

A campaign with a 20% ACOS may be acceptable for a high-margin product and unacceptable for a low-margin product. The same advertising result can have very different effects on cash flow.

3. Understand the auction, but do not overreact

Read the FTC complaint and Amazon’s public response if you want to understand the competing positions. The lawsuit is early, and the court process may take considerable time.

Do not immediately stop all advertising based on the allegation. Turning off profitable campaigns can reduce sales velocity, visibility, and inventory turnover.

Instead, consider testing:

• Lower bids on marginal keywords
• Tighter daily budgets
• Better-performing placements
• Negative keywords
• More selective product targeting
• Campaigns with clear break-even limits

A break-even ACOS calculation can help. If your contribution margin before advertising is 30%, an ACOS materially above that level may require close review. This is only a starting point, not a universal rule.

4. Diversify your traffic sources

A marketplace can provide valuable customer access, but relying on one platform for both sales and traffic increases business risk.

Depending on your product and audience, alternatives may include:

• An independent ecommerce website
• Email marketing
• Organic search
• Social media content
• Partnerships and affiliates
• Wholesale relationships
• Direct customer referrals

Diversification takes time and may involve its own costs. Still, building more than one customer-acquisition channel gives you greater control if advertising prices, policies, or algorithms change.

5. Keep records and avoid speculation

Save invoices, ad reports, account statements, and notes about campaign changes. Organize them by month and product.

If the case later leads to a claims process, restitution program, or private litigation, records may help establish your advertising activity. That outcome is not guaranteed.

Be cautious about anyone promising immediate compensation or asking for upfront fees to “claim” money from the lawsuit. Verify announcements through official government sources and consult a qualified attorney before making legal decisions.

What we do not know yet

Several important questions remain unanswered:

• Will the FTC and states prove their allegations?
• How will the court interpret Amazon’s advertising disclosures?
• What damages, if any, will be established?
• Could affected advertisers receive restitution?
• Would any remedy change Amazon’s ad pricing system?
• Would future auction rules become more transparent?
• How would a settlement or judgment identify eligible advertisers?

The alleged $20 billion figure may change as the case develops. It should not be treated as an amount that sellers can expect to recover.

The practical takeaway for sellers

The most useful response is disciplined financial management.

Review your advertising data. Calculate profitability at the product level. Set bid and budget limits. Preserve records. Develop other sources of traffic. Monitor official updates without making decisions based on speculation.

The FTC’s lawsuit may eventually change how marketplace advertising auctions are disclosed or priced. Regardless of the outcome, sellers benefit from knowing exactly how much they spend to generate each sale.

If advertising costs are affecting your broader household or business budget, our resources on key components of financial planning and budgeting for discretionary expenses can help you evaluate cash flow more systematically.

FAQs: Amazon Ad Spend

1. Is Amazon required to refund sellers now?

No. The lawsuit is pending, and no refund program has been established by the information currently available. Any financial remedy would depend on future court orders, a settlement, or another legal process.

2. Does the lawsuit prove Amazon overcharged every advertiser?

No. The complaint contains allegations by the FTC and participating states. It does not establish that every advertiser was overcharged or that Amazon is legally liable.

3. Should I stop using Amazon ads?

Not automatically. Review campaign profitability first. A profitable campaign may still be worth running, while an unprofitable campaign may need lower bids, a smaller budget, or different targeting.

4. What is ACOS?

ACOS means advertising cost of sales. It is calculated by dividing advertising spend by attributed sales. For example, $20 in ad spend that produces $100 in sales equals a 20% ACOS.

5. What is a second-price auction?

A second-price auction generally allows the highest-ranked bidder to win while paying an amount based on the next-highest qualifying bid, rather than automatically paying the full winning bid. Actual digital advertising systems can include relevance, placement, and other rules.

6. What does PPC mean?

PPC means pay-per-click. Under a PPC advertising model, the advertiser generally pays when someone clicks the ad.

7. Which Amazon ads are discussed in the complaint?

The complaint addresses Sponsored Products, Sponsored Brands, and Display Ads appearing alongside search results on Amazon’s website and mobile application.

8. How long could the lawsuit take?

There is no reliable timeline. Lawsuits involving complex technology, economic evidence, and multiple legal claims can take years to resolve.

9. Should sellers join a class action immediately?

No. Do not act based on unsolicited claims or promises of guaranteed compensation. If a formal claims process develops, review the official notice carefully and consider speaking with an attorney.

10. What records should Amazon sellers save?

Keep ad invoices, campaign reports, keyword reports, bid history, product-level profitability calculations, account statements, and notes about major changes in advertising costs.

11. Can higher ad costs be passed on to customers?

A business may change prices for many legitimate reasons, including advertising, fulfillment, inventory, and operating costs. Sellers should evaluate customer demand and competition before changing prices.

12. Where can sellers follow official updates?

The FTC’s legal library, official press releases, and court filings are better sources than social media summaries or unsolicited legal advertisements.

This article is an educational resource, not legal advice. The FTC’s case is pending, and the allegations have not been proven in court.