Visa vs Mastercard vs Amex vs Discover (2026): What the Network Changes
Visa and Mastercard are interchangeable: choose the card, not the logo. Amex and Discover are mostly both network and lender, so their cards are only as good as their own terms, and they are taken less widely abroad. The network matters most at Costco (Visa only), at merchants that surcharge, and outside the US.
The US has four card networks, and they are not four versions of the same thing. Two are open rails that thousands of banks issue cards on. The other two mostly issue their own cards on their own rails. That split explains nearly every real difference between them.
The four networks
| Network | Model | Acceptance | Worth knowing |
|---|---|---|---|
| Visa | Open network: thousands of banks issue on it | Near-universal in the US and abroad | The only credit network Costco warehouses take |
| Mastercard | Open network: thousands of banks issue on it | Near-universal in the US and abroad | Interchangeable with Visa almost everywhere |
| American Express | Mostly closed: Amex is the network and the lender for most of its cards | Widely taken in the US; patchier abroad and at small merchants | Earn rates and travel benefits are often the draw |
| Discover | Closed: Discover issues on its own network, owned by Capital One since May 2025 | Widely taken in the US; thin abroad, through partner networks | No foreign transaction fees on its cards |
Open networks and closed ones
A Visa or Mastercard card is issued by a bank. The bank approves you, sets the interest rate, the annual fee and the rewards, and decides whether to charge a foreign transaction fee. So two Visa cards can differ completely, and comparing "Visa against Mastercard" compares almost nothing. Compare the cards.
American Express and Discover work differently. For most of their cards they are the lender as well as the network, so the card's terms come from the same company that runs the rails. Discover is now part of Capital One, which completed the acquisition on 18 May 2025, so Capital One owns both a lender and a network. Existing Discover accounts carried on unchanged.
Where each one works
Visa and Mastercard are accepted almost everywhere that takes cards, in the US and abroad. Costco is the famous exception: its US warehouses accept Visa as their only credit card network. If Costco is a regular stop, a Visa is the one network choice with a practical consequence.
American Express is taken at most US merchants that accept cards, but less reliably at small businesses and in many countries. Discover's US acceptance is broad; abroad it relies on partner networks and is the thinnest of the four. Anyone traveling with an Amex or Discover as their main card should carry a Visa or Mastercard too.
Fees that can outweigh rewards
Two charges decide more than any network's perks. In most states a merchant can add a credit card surcharge, capped by Visa at 3% or the merchant's own cost, and never on debit; Connecticut and Massachusetts ban it. Against a rewards card, a full surcharge is a loss at any common earn rate:
| Your card earns | Surcharge | Net on $100 |
|---|---|---|
| 1% | 3% | -$2.00 |
| 1.5% | 3% | -$1.50 |
| 2% | 3% | -$1.00 |
The other is the foreign transaction fee, set by the issuer, not the network. On a $4,000 trip abroad:
Fees applied to the converted purchase amount. The exchange rate itself is set by the network and differs very little between Visa and Mastercard; the issuer's fee is the number that matters.
$120 on one trip is more than most cards earn in rewards on the same spending. For travel, a no-foreign-fee card on Visa or Mastercard is the combination that matters; which of the two hardly does.
Debit is a different system
Debit cards run on the same networks but under different rules. For banks with $10 billion or more in assets, the Federal Reserve's Regulation II caps the fee a merchant pays on a debit transaction at 21 cents plus 0.05%, with a cent more for fraud prevention. That is a fraction of what a credit card earns the issuer, which is why big-bank debit cards rarely pay rewards and why surcharges cannot be applied to them.
What to compare instead
Once the network question is settled, which for most people takes one look at whether they shop at Costco and travel abroad, compare what the issuer sets: the rewards your spending earns after the fee, the purchase rate if you might carry a balance, and the foreign transaction fee. If you are carrying a balance, the rate matters far more than the rewards; see debt avalanche vs snowball. For approval odds, see FICO score ranges.
Frequently asked questions
What is the difference between Visa, Mastercard, Amex and Discover?
Visa and Mastercard are networks only: banks issue the cards, set the rate and the rewards. American Express and Discover mostly issue their own cards on their own networks, so they are both the network and the lender. That is why an Amex card's benefits come from Amex, while a Visa card's come from whichever bank issued it.
Is Visa or Mastercard better?
Neither, in practice. Both are accepted almost everywhere in the US and abroad, and the rate, fee and rewards come from the issuing bank. The one well-known difference is Costco, whose US warehouses accept Visa and no other credit card network.
Is American Express accepted everywhere?
Not quite. It is accepted at most US merchants that take cards, but less consistently at small businesses and outside the US. Many Amex users carry a Visa or Mastercard as a backup.
Who owns Discover now?
Capital One, which completed its acquisition of Discover Financial Services on 18 May 2025. Existing Discover cards and accounts continued unchanged.
Can a store charge a fee for paying by credit card?
In most states, yes. Visa limits a surcharge to 3% or the merchant's own cost, whichever is lower, and it cannot be applied to debit cards. Connecticut and Massachusetts prohibit credit card surcharges, and several other states restrict them.
Why don't debit cards earn rewards?
For banks with $10 billion or more in assets, the Federal Reserve's Regulation II caps what a merchant pays per debit transaction at 21 cents plus 0.05% of the purchase, with a cent more for fraud prevention. That leaves little to fund rewards, which is why big-bank debit cards rarely offer them.
Which network is best for travel abroad?
Visa and Mastercard, for acceptance. The bigger cost is the issuer's foreign transaction fee, often 3%, which some issuers, including Capital One and Discover, do not charge. Discover's acceptance abroad is the weakest of the four.
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Researching and writing about Canadian personal finance since 2026.
Last reviewed October 2026 · How we research
“Visa vs Mastercard vs Amex vs Discover (2026): What the Network Changes.” Vault Nerd, https://www.vaultnerd.com/learn/visa-vs-mastercard-vs-amex-vs-discover, updated October 2026.
- Capital One, 18 May 2025: Capital One completes acquisition of Discover
- Visa Rules: US credit card surcharge cap of 3%, effective 15 April 2023
- Federal Reserve Regulation II (Debit Card Interchange Fees and Routing)
No card is recommended on this page. Vault Nerd may earn commissions from some card issuers elsewhere on the site; nothing here depends on that. Figures checked October 2026.