Published: 2026-09-10 — Ari
Advertising Law Basics Every Founder Should Know
Most founders learn advertising law the hard way — from a cease-and-desist letter, a competitor complaint, or an FTC inquiry. The rules aren't complicated once you understand the framework, and knowing them before you need them is significantly cheaper than learning them in response to an enforcement action.
The legal framework for advertising in the U.S.
U.S. advertising is regulated at the federal level primarily by the FTC under the FTC Act, which prohibits unfair or deceptive acts or practices in commerce. Specific industries have additional overlay: the FDA regulates health and food advertising claims, the CFPB oversees financial product advertising, and the FCC governs broadcast advertising.
State consumer protection laws add a parallel layer. Most states have statutes modeled on the FTC Act, and state attorneys general actively enforce them. For businesses operating nationally, compliance with both federal and the most restrictive state standards is the practical approach.
Truth in advertising: the core standard
The foundational rule: advertising must be truthful, not misleading, substantiated, and fair. Truthful means the claims are accurate. Not misleading means the overall impression is accurate, not just the literal words. Substantiated means you have evidence before you make the claim.
The 'overall impression' standard matters because technically true statements can be legally deceptive if the clear implication for a typical consumer is false. A claim that '9 out of 10 customers saw results' may be literally accurate but deceptive if the 'results' were trivial or the sample was selected to produce the statistic.
Comparative advertising: the rules
Comparing your product to a competitor's is legal and widely used — but it comes with elevated substantiation requirements. Every comparative claim must be substantiated, and the comparison must be fair and accurate. If you claim superiority, your evidence must show superiority on the specific attribute claimed.
Disparagement — making false statements of fact about a competitor's products — creates liability for commercial defamation (trade libel) independent of FTC compliance. Puffery ('we're the best') is generally protected; specific false factual claims are not.
Digital advertising: specific regulations to know
- Email: the CAN-SPAM Act is one of the laws that commonly applies to commercial email; confirm what applies to your messages with counsel
- Text/SMS: the TCPA is one of the laws that commonly applies to marketing texts and calls; confirm what applies to your program with counsel
- Online behavioral advertising: Regulators encourage disclosure of data collection practices and choice mechanisms
- Dark patterns: deceptive design in subscription flows and online checkouts is actively enforced by the FTC
- Native advertising: content that looks editorial must be clearly labeled as advertising
Sweepstakes, contests, and promotions
Promotions that involve a prize are an area where laws commonly apply, and the rules vary by state and by how the promotion is structured. Confirm the approach with counsel before launching one. Running a promotion without clear terms and disclosures can create legal risk.
Social media platform rules for promotions add another compliance layer — each major platform prohibits certain types of promotions and requires specific disclosure language. Platform rules don't replace legal requirements; they stack on top of them.
Building legally sound marketing campaigns
A pre-flight compliance checklist for every campaign: Are all claims substantiated? Are material connections disclosed? Are the appropriate opt-in or consent mechanisms in place for the channels being used? Does any campaign element require regulatory notice (sweepstakes, financial products, health claims)?
For campaigns with significant budget or reach, a legal review before launch is worth the investment. The cost of compliance review is predictable; the cost of enforcement is not.