The Costco return policy 2026 — formally the "Risk-Free 100% Satisfaction Guarantee" — is one of the most commercially consequential and most psychologically powerful consumer protections in all of American retail. As of February 17, 2026, Costco's official policy page continues to offer its Risk-Free 100% Satisfaction Guarantee, with most products not subject to any return timeline. No receipt required for most categories. No original packaging required for most items. No re