Advertising dispute trends to watch in 2026

For in-house counsel and marketing teams, 2026 is shaping up to be an active year for advertising disputes.

Regulators, competitors, and consumers are converging on familiar concerns – truthfulness, transparency, and data-driven targeting – even as marketing tools and channels evolve. Enforcement remains active at both the federal and state levels.

National Advertising Division (NAD) challenges play an increasingly strategic role in advertising disputes, while Lanham Act and consumer class actions continue to address questions of substantiation and consumer perception.

In practical terms, heightened scrutiny of performance claims, green and social‑impact messaging, pricing representations, and influencer content may be expected, with artificial intelligence (AI) and retail media creating risks and opportunities.

In this article, we highlight eight trends in advertising disputes to watch in the year ahead.

Substantiation standards harden for performance, health, and “AI-powered” claims

In 2026, advertising disputes may center on whether advertisers have “competent and reliable” support for express and implied claims, with three themes drawing particular attention.

First, performance and superiority claims remain in focus, especially where advertisers rely on internal analytics, model‑based testing (rather than real-world trials), or novel methodologies. Competitor challenges at NAD and in Lanham Act suits may be expected to probe test protocols, sample sizes, environmental conditions, and statistical significance, as well as scrutinize whether study populations reflect the real‑world use cases suggested by the ad.

Second, health‑related and “clinically proven” claims are still high risk across supplements, beauty, and functional foods. Disputes increasingly turn on the quality hierarchy of evidence, the match between endpoints and advertised benefits, and the net impression of qualifiers.

Third, claims like “AI‑powered,” “autonomous,” and “smart” are drawing the same rigor applied to traditional performance claims. Plaintiffs and competitors are challenging whether machine-learning features are material to outcomes and whether training data, validation, and error rates are adequately described. Advertisers can assume substantiation will be tested not only for accuracy, but also for fit with the consumer takeaway conveyed by creative design, headlines, and testimonials.

Sustainability, recyclability, and climate transition claims face scrutiny

Green claims have become a complex dispute category that blends environmental science with consumer perception. Claims like “recyclable,” “compostable,” “plastic-neutral,” “low-carbon,” and “net zero” are being reviewed for the availability and accessibility of recycling or composting programs, the conditions required to achieve environmental benefits, and accounting for offsets versus actual emissions reductions.

Many recent competitor challenges have focused on whether general environmental benefit claims imply broader attributes than the advertisers can support, and whether qualifications are sufficiently prominent to avoid net impression issues. More disputes around supply chain claims, including sourcing, deforestation-free assertions, and labor-related “ethical” designations, may be expected.

Standards are evolving, but the bar for specificity, clarity, and substantiation remains high. In practice, this means aligning claims with product‑level evidence, avoiding broad sustainability messaging when support is programmatic or aspirational, and ensuring claims do not outpace verifiable progress.

Pricing, “junk fees,” and reference price litigation escalate

Pricing representations remain a flashpoint. “Was/now” comparisons, “up to” savings, list price references, and “limited time” offers continue to attract class actions and competitor challenges.

Disputes focus on whether reference prices reflect bona fide, recent market prices; whether “up to” claims are representative of typical savings; and whether mandatory fees are disclosed early and clearly enough to avoid deception. Disputes over drip pricing in travel, ticketing, hospitality, and local services – and growing attention to “free” offers conditioned on data sharing or subscription enrollment – may increase.

Retailers and platforms may expect audit trails of pricing histories and fee disclosures to play a key role in defense strategies.

Influencer, native, and social commerce content: Disclosure and control

Influencer marketing and native advertising continue to face challenges where endorsements are not clearly identified or where material connections are insufficiently disclosed.

In 2026, enforcement and competitor challenges may increasingly focus on short‑form video and live commerce formats in which disclosures can be fleeting. Recent disputes have also focused on advertisers’ control and monitoring obligations – what policies, training, and takedown procedures are in place, and how promptly non-compliant content is remediated.

Testimonials and user-generated content that imply typical results, product safety, or comparative superiority call for the same level of substantiation as traditional ads. Marketers are encouraged to ensure that disclosures are unavoidable on mobile, persist through resharing and stitching, and are adapted to the platform’s native user interface.

Dark patterns, data-driven targeting, and adtech transparency collide

As various state privacy laws have taken effect, the overlap between consumer protection and advertising disputes has become more pronounced.

Challenges increasingly allege that interface designs steer consumers toward consent, enroll them in subscriptions unintentionally, or obscure material terms. Subscription auto-renewal, cancellation flow, and trial-to-paid transitions may be central to disputes.

At the same time, disclosures about data-driven targeting – lookalike audiences, sensitive-category inferences, and cross-device tracking – are an expanding area of advertising claim risk.

Where ads rely on audience segmentation to deliver promised relevance or performance, litigants may question whether the “audience” definition and data provenance align with the ad’s message.

Advertisers are encouraged to monitor cases that combine deception theories with state privacy law claims, and disputes over whether privacy labels and ad disclosures are consistent across channels.

NAD as a first-stop forum – and a roadmap for litigation

NAD continues to be a nimble venue for resolving comparative and performance disputes.

In 2026, NAD may increasingly rely on expedited tracks for limited issues, sharpen its focus on net impression, and extend its analysis beyond messaging to product design elements that contribute to consumer takeaway.

NAD decisions remain influential in shaping substantiation norms, and challengers may use them as springboards to refine pleadings in later Lanham Act or class actions.

For in-house teams, developing substantiation dossiers and creative briefing materials aligned with NAD’s standards may be useful in the event of a dispute.

Survey evidence and the evolving “reasonable consumer”

Consumer surveys continue to play a central role in both NAD challenges and litigation. The debate has shifted from whether a survey is necessary to which designs are most probative in digital environments.

Courts and self-regulatory bodies are looking closely at ads or content selected for survey participants, real-world validity on mobile screens, attention and exposure controls, and the treatment of disclaimers and hyperlinks.

Surveys that do not replicate the path to purchase or that fail to reflect the speed and context in which ads are consumed may face more challenges.

At the same time, courts are seeing allegations that apply the “reasonable consumer” standard to net impressions formed in dynamic feeds.

Advertisers can expect evidentiary showings to account for format, sequencing, and interactivity.

Retail media and retailer claims: Who owns the risk?

As retail media networks expand, the line between retailer and brand advertising has blurred, complicating questions regarding responsibility for claims, targeting, and placement.

Disputes increasingly raise questions about who substantiates comparative claims embedded in retail pages, who manages disclosures around sponsored ranking, and how algorithmic placements intersect with competitor trademarks.

Contractual allocation of risk – and the operational reality of approval rights, data access, and takedown speed – may be critical. Multi-party disputes involving brands, retailers, and adtech intermediaries could increase, with content moderation and ad‑serving controls emerging as central issues.

Conclusion

The following practical takeaways may be considered for advertising dispute trends in 2026:

• Invest early in substantiation that matches the consumer takeaway.
• Sharpen disclosures for emerging formats.
• Align pricing practices with both legal and consumer expectations.
• Treat data-driven advertising as part of the advertising claim itself.

Regulators and private challengers are largely focusing less on formal labels and more on outcomes – how consumers actually perceive, pay for, and use products in a mobile-first, increasingly AI-enabled marketplace.

In-house counsel and marketing leaders who build cross-functional processes – bringing together legal, insights, sustainability, privacy, and product teams – may be best positioned to reduce dispute risk while retaining creative agility.

For more information, please contact the authors.