Affiliate marketing has no dedicated federal statute. It runs on the prohibition of deceptive acts and practices in section 5 of the Federal Trade Commission Act, 15 U.S.C. 45, layered with three rulebooks program owners discover late. First come the Guides Concerning the Use of Endorsements and Testimonials in Advertising, 16 CFR Part 255, revised in 2023 to widen who counts as an endorser and to require that disclosure of a material connection be unavoidable rather than merely present on the page. A commission link is one. The duty to disclose it sits with the merchant as heavily as with the affiliate, so an affiliate agreement has to impose it as an enforceable term.
Next is the Rule on the Use of Consumer Reviews and Testimonials, 16 CFR Part 465, in force since late 2024, which turned several endorsement failures into civil penalty exposure per violation. Paying a partner more for a positive review now breaks a trade regulation rule, not an advisory guide.
Then there is FTC v. LeadClick Media, LLC, 838 F.3d 158 (2d Cir. 2016), where the Second Circuit held an affiliate network directly liable under section 5 for fake news pages built by its publishers, because it recruited them, paid them and had authority to control their content. Section 230 of the Communications Decency Act gave no shelter. Authority to control is the operative phrase: a merchant who reserves approval rights and never uses them stands in a worse position than one who audits.
Email adds a layer. Under 15 U.S.C. 7705 the promoted business answers for a partner's unlawful commercial email where it knew of the promotion, took an economic benefit and did nothing reasonable to stop it, as the Cornell Legal Information Institute text of the statute on businesses promoted by unlawful email sets out. Sector rules can bar the payment outright. RESPA section 8, 12 U.S.C. 2607, prohibits fees for referring settlement service business on federally related mortgage loans, which reshapes any program touching lending or a residential purchase agreement used by American buyers and sellers, and the Anti-Kickback Statute, 42 U.S.C. 1320a-7b(b), does the same in health care.