Costco only takes Visa credit cards in the U.S. because it has an exclusive partnership with Visa that dramatically lowers the card fees Costco pays, helping it keep member prices down. This trade‑off limits card choice at checkout but saves Costco tens of millions in processing costs each year.

Quick Scoop

The core reason

  • Credit card companies charge merchants around 1.5–3% per transaction, which adds up to huge sums for a high‑volume retailer like Costco.
  • Costco negotiated an exclusive deal where it routes all credit transactions through Visa in exchange for extremely low processing fees (reported under 0.4% in some analyses).
  • Those lower fees let Costco maintain its “everyday low margin” model and pass savings on through cheaper bulk prices and gas.

How the Visa deal happened

  • For years, Costco had a similar exclusive arrangement with American Express, then the two sides failed to agree on renewal terms around 2015.
  • Visa (with Citi as the co‑branded card issuer) stepped in with a better financial offer, locking in exclusivity at U.S. warehouses and gas pumps.
  • The logic is simple: Costco funnels billions in volume through one network; in return, Visa gives rock‑bottom rates that other networks didn’t match.

What cards and payments Costco actually accepts

Even though it “only takes Visa,” that phrase mainly applies to credit cards in U.S. warehouses:

  • Accepted in most U.S. warehouses:
    • Visa credit cards only.
* Most **debit** cards (including ones issued on other networks) still work because they clear differently.

* Cash, checks (where allowed), EBT, some mobile wallets, and other non‑credit methods are generally accepted.
  • Country wrinkle: In Canada, Costco’s exclusive partner is Mastercard , not Visa, showing this is a negotiated business choice, not a technical requirement.

Why not “take everything” like other stores?

From a forum and business‑strategy angle, people often ask why Costco doesn’t accept all card networks:

  • Taking every network would raise average processing fees and eat into Costco’s thin margins.
  • Costco bets that most members are willing to adapt—by getting a Visa card, using debit, or paying another way—in exchange for lower prices on big‑ticket and bulk items.
  • Some shoppers do complain or even skip membership over this limitation, but the volume Costco brings to Visa suggests the partnership is still highly profitable for both.

Mini TL;DR

  • Exclusive Visa deal = ultra‑low fees for Costco.
  • Ultra‑low fees = lower prices and preserved margins.
  • Trade‑off: You lose credit card flexibility at checkout, but Costco and Visa gain a huge, tightly controlled payments pipeline.

Information gathered from public forums or data available on the internet and portrayed here.