Costco announced today that they will be switching their co-branded credit card from AMEX to a Citibank Visa.
If you have a Costco AMEX card you’ll likely be able to switch it for a different AMEX card, though those details are still fuzzy. If you want a new Costco co-branded credit card you’ll need to apply separately for the new Citi Costco Visa.
Costco will soon begin to accept Visa credit card cards and effective 04/01/16 will no longer accept AMEX cards. You won’t have to pay with a Citibank card, any Visa will do.
Costco in Canada recently switched from AMEX to Mastercard, and going forward you’ll need to use a Mastercard in Canada and a Visa in the USA.