5 Secret Costco Return Perks Every Member Should Know

Updated: February 2026 | Insider Tips by US Return Master

Costco is famous for its "Risk-Free 100% Satisfaction Guarantee." While most people know they have a great policy, there are several "secret" perks that even long-time members often miss.

1. The "Lifetime" Return Window

Unlike almost any other retailer, Costco does not have a formal time limit on most returns. Whether you bought a vacuum cleaner two years ago or a set of plates last month, if it breaks or you aren't satisfied, you can usually return it for a full refund.

2. No Receipt? No Problem

Because every purchase is tied to your membership card, Costco has a digital record of everything you've ever bought. You don't need to save paper receipts; just show your membership card at the returns desk.

3. Returning Opened Food

Did you try a new snack and hated the taste? Costco allows you to return opened food items for a full refund. The only unofficial rule is that at least 50% of the product should still be in the package.

4. Electronics: The 90-Day Exception

While most items are "lifetime," electronics have a strict 90-day limit. This includes TVs, computers, major appliances, and cameras. However, Costco offsets this by providing free technical support and often extending the manufacturer's warranty.

5. Diamonds and Jewelry

Costco sells high-end jewelry, but these have special rules. Diamonds over 1.00 carat require all original paperwork (GIA certificates) and will undergo a 48-hour verification process by a gemologist before a refund is issued.