An affiliate agreement, also known as an affiliate program terms of service or affiliate contract, is a legally binding document that establishes the rules and expectations of the relationship between a business (the merchant) and its affiliate partners. It protects both parties by clearly defining how the partnership works, what is expected, and what happens if terms are violated.

Key Components of an Affiliate Agreement

• Commission structure: The exact rates, payment models (CPA, CPS, CPL, recurring), and any tiered structures or bonuses.
• Payment terms: When and how commissions are paid, minimum payout thresholds, holding periods, and accepted payment methods.
• Cookie duration and attribution: The length of the attribution window and how conversions are credited to affiliates.
• Promotional guidelines: What marketing methods are permitted and prohibited. This may restrict paid search bidding on brand terms, spam, or misleading claims.
• Brand usage: Rules for using the merchant's trademarks, logos, and brand assets in promotional materials.
• Disclosure requirements: Obligations for affiliates to comply with FTC guidelines and other regulatory requirements for disclosing affiliate relationships.
• Prohibited activities: Explicit restrictions on fraud, cookie stuffing, self-referrals, and other illegitimate practices.
• Termination clauses: Conditions under which either party can end the partnership, and what happens to pending commissions upon termination.
• Liability and indemnification: Legal protections for both parties regarding claims arising from the affiliate's promotional activities.

Why Affiliate Agreements Matter

A well-drafted affiliate agreement protects your business from potential legal issues, brand damage, and financial losses. Without clear terms, disputes over commissions, promotional methods, or termination can become costly and time-consuming. The agreement sets expectations upfront, reducing misunderstandings and providing a clear framework for resolving conflicts.

For affiliates, the agreement provides confidence that they will be fairly compensated for their work and that the rules are transparent. Serious affiliates review program agreements before joining and prefer programs with clear, fair terms.

Common Mistakes to Avoid

Many programs make the mistake of using overly vague agreements that leave room for interpretation. Your commission structure should specify exact rates and conditions, not general ranges. Payment terms should include specific dates and thresholds. Prohibited activities should be listed explicitly rather than relying on generic language.

Another common mistake is failing to update the agreement as the program evolves. Commission rates, promotional guidelines, and compliance requirements change over time—your agreement should reflect current terms and be versioned so affiliates always know which terms apply.

Enforcing the Agreement

Having an agreement is only valuable if it is enforced. Monitor affiliate activities for compliance, address violations promptly, and be prepared to terminate affiliates who repeatedly violate terms. Fair and consistent enforcement maintains program integrity and protects your brand.