Yes, Square accepts American Express cards both in-person and online

Square's payment system processes American Express transactions through its standard card reader and online checkout tools. When a customer swipes, inserts, or taps an Amex card at a Square reader, or enters the card details on a Square Online store, the transaction goes through the same system as Visa or Mastercard. You do not need to set up anything special or use a different reader — Amex works automatically once you have a Square account.

The main difference between Amex and other cards shows up in the fee you pay, not in whether the card works. Square charges a different rate for Amex transactions than it does for Visa or Mastercard, and that rate can vary depending on which Square pricing plan you use.

Key Takeaways

  • Square accepts Amex cards at all its readers and online checkout without any extra setup or configuration.
  • Amex transactions process at a higher fee rate than Visa or Mastercard on most Square plans.
  • The exact Amex fee depends on your Square pricing plan — standard, subscription, or custom rates.
  • Customers can use Amex the same way they use any other card: swipe, insert, or tap at the reader, or enter details online.

How Amex transactions work on Square readers

When a customer presents an Amex card at your Square reader, the card is processed through the same hardware and software that handles all other card types. The reader accepts contactless payments (tap), chip cards (insert), and magnetic stripe (swipe) from Amex just as it does from Visa or Mastercard. The transaction settles into your Square account the same way, and the funds deposit on your normal schedule.

You see the Amex transaction in your Square Dashboard with the card type labeled as "American Express" so you can track which cards your customers use. The receipt printed or emailed to the customer shows the Amex logo and last four digits of the card, the same as any other card type.

Amex fees on Square pricing plans

Square charges different rates depending on which pricing plan you use. On the standard pay-per-transaction plan, Amex typically carries a higher percentage fee than Visa or Mastercard. On Square Subscriptions (a fixed monthly fee plan), Amex may be included in the flat rate or charged separately depending on your contract. If you have a custom rate negotiated with Square, your Amex rate is part of that agreement.

The exact percentage varies and can change, so check your current pricing in the Square Dashboard under Settings > Pricing to see what you are being charged for Amex versus other card types. If you process a high volume of Amex transactions, the difference in rate can add up, and it may be worth asking Square about your options.

Accepting Amex online through Square Online

Square Online, the e-commerce platform, accepts Amex cards at checkout the same way it accepts Visa and Mastercard. A customer entering their Amex details into your online store sees no difference in the checkout flow — the card type is detected automatically when they enter the card number. The transaction is processed and settled the same way as in-person Amex transactions.

Amex fees on Square Online transactions follow the same rate structure as in-person transactions on your plan. If you use Square Online Checkout (the embedded payment form for invoices or links), Amex is also accepted and charged at your standard Amex rate.

What happens if an Amex transaction is declined

If a customer's Amex card is declined at your Square reader, the decline message appears on the screen just as it would for any other card. The customer can try a different card, contact their bank, or use another payment method. Square does not treat Amex declines differently from Visa or Mastercard declines — the reason (insufficient funds, fraud block, expired card) comes from the cardholder's bank, not from Square.

You can ask the customer if they want to try again, use a different card, or pay by another method. If the customer disputes the transaction later, Amex handles the chargeback through the same process as other card networks.

Amex corporate and business cards on Square

Square accepts Amex corporate cards, small business cards, and personal Amex cards without distinction. The reader does not separate business Amex from personal Amex — it processes all Amex cards the same way. If you need to track whether a customer used a business or personal card, you would have to ask them directly; Square's system does not display that information.

Some Amex business cards carry different rewards or benefits for the cardholder, but that does not affect how Square processes the transaction or what you pay in fees.

Comparing Amex fees to other card networks on Square

On Square's standard pay-per-transaction pricing, Amex typically costs more per transaction than Visa or Mastercard. For example, if Visa costs 2.6% plus $0.10 per transaction, Amex might cost 3.5% plus $0.10 — but these numbers vary by region and can change. Debit cards often have a lower rate than credit cards across all networks.

If you process many Amex transactions, the higher rate compounds. A business that accepts a lot of Amex might save money by negotiating a custom rate with Square or by comparing Square's rates to other payment processors. Square's pricing page and your Dashboard both show your current rates so you can do the math on your own transaction mix.

Frequently Asked Questions

Do I need a different Square reader to accept Amex?

No. All Square readers — the Square Reader for contactless and chip, the Square Reader for magstripe, and the Square Stand — accept Amex cards without any special setup or additional hardware. Amex works automatically on any Square reader.

Why does Amex cost more on Square than Visa?

Amex charges Square a higher interchange rate than Visa or Mastercard do, and Square passes that cost to you. Amex is a closed network (it issues its own cards and processes its own transactions), while Visa and Mastercard are open networks. The higher cost reflects Amex's business model and the benefits Amex cardholders often receive.

Can I refuse Amex payments on Square?

Square does not offer a built-in setting to block Amex while accepting other cards. If you want to decline Amex, you would have to tell customers at the point of sale or remove Amex from your accepted payment methods manually — though this is not a standard Square feature and may require contacting Square support.

Does Square report Amex transactions differently for taxes?

No. All card transactions, including Amex, appear in your Square Dashboard and are reported the same way for tax purposes. Square provides the same records and 1099-K reporting for Amex as for any other card type.

What if a customer's Amex card is flagged as fraud?

If Amex's fraud system declines the card, the decline message appears at your reader the same way it would for any other card. The customer must contact Amex to resolve the fraud hold. Square does not intervene in Amex's fraud decisions.