Every holiday season, thousands of members buy a gift at Costco in October or November and discover in January that the return window has already closed. This Costco holiday return policy guide 2026 is built to prevent that. The core rule is generous: Costco is known for a satisfaction guarantee that covers most merchandise with no time limit. But a handful of categories have deadlines or exclusions, and the most expensive gifts, electronics and appliances, are exactly the on