An ISA fee, short for International Service Assessment fee, is the charge that Visa, Mastercard, and other card networks add to any transaction that crosses a national border. It runs from about 0.6% to 1.4% of the purchase, depending on the network and whether a currency conversion is involved. You rarely see it on its own because your bank rolls it into the larger “foreign transaction fee” that appears on your statement. Knowing what the ISA is, and how your issuer stacks its own markup on top, is the difference between guessing at your international costs and actually understanding them.
ISA Fee vs. Foreign Transaction Fee
People use these terms interchangeably. They aren’t the same thing. The ISA is the network-level charge set by Visa or Mastercard for routing a payment across borders. Your bank or card issuer then adds its own markup on top of that. The two combined are what shows up as the “foreign transaction fee” on your statement.
A typical breakdown: the network charges roughly 0.6% to 1.4%, and your issuer adds another 1% to 2%. That’s how most foreign transaction fees land near 3% of the purchase. When a card advertises “no foreign transaction fee,” the issuer is absorbing the network’s ISA charge and waiving its own markup. The network still collects behind the scenes; the issuer just eats the cost as a product perk.
How Each Network Sets Its Rates
Visa and Mastercard don’t charge the same percentages, and both rates change depending on whether a currency conversion is involved.
Visa charges 1% when the transaction settles in U.S. dollars and 1.4% when a currency conversion is required. A purchase from a British retailer priced in pounds triggers the higher rate because Visa’s systems must convert pounds to dollars during settlement.
Mastercard’s cross-border assessment is lower: 0.6% for transactions settled in U.S. dollars and 1% for those requiring currency conversion.1Mastercard. Network Assessment Fees as of July 1, 2025 The gap between the two networks can matter on a large purchase if you carry both.
Discover charges an ISA of about 0.8% on the acquiring side, but Discover cards sold directly to U.S. consumers carry no foreign transaction fee at all.2Discover. How to Avoid Foreign Transaction Fees American Express doesn’t publish a single ISA rate the way Visa and Mastercard do. Amex’s foreign transaction fees vary by card, and several premium products waive the fee outright.3American Express. What You Should Know About Foreign Transaction Fees
What Actually Triggers the Fee
The trigger isn’t where you’re standing. It’s where the banks are. An ISA fee applies whenever the bank that issued your card sits in a different country than the bank processing the merchant’s payments. You can be at home in Ohio, buying from a .com site with prices in U.S. dollars, and still get charged an ISA fee if the merchant’s processor is based overseas.
This catches people off guard with digital services. Subscription software, cloud storage, streaming platforms, and app marketplaces sometimes route payments through acquiring banks in Ireland, Singapore, or wherever the parent company is headquartered. The website looks domestic, the price is in dollars, and the fee still lands on your statement because the money crossed a border on the back end.
Physical travel triggers the fee more predictably. Swiping or tapping at a restaurant in Paris, a hotel in Tokyo, or a shop in Mexico City almost always involves a foreign acquiring bank. So does pulling cash from an overseas ATM on a Visa- or Mastercard-linked debit card.
Dynamic Currency Conversion Stacks on Top
Dynamic currency conversion is a separate cost that can pile onto the ISA charge if you aren’t paying attention. At a foreign terminal or ATM, the machine may offer to show the price in U.S. dollars instead of the local currency. Saying yes means the merchant’s bank does the conversion on the spot, using its own exchange rate with a markup that typically runs around 1% or more.
The catch: you still pay the ISA fee to your card network and any markup from your issuer on top of that merchant conversion. You’re effectively paying for the conversion twice. Mastercard’s rules require merchants to inform cardholders of their right to choose which currency the transaction is completed in, disclose both the local and converted amounts, and show the exchange rate being applied before the cardholder selects.4Mastercard. Dynamic Currency Conversion Performance Guide
The rule of thumb is simple: always pay in the local currency. Let your card network handle the conversion. Its wholesale exchange rate is almost always better than what a merchant terminal offers, even with the ISA fee factored in.
Debit Cards and Overseas ATMs
ISA fees aren’t a credit-card-only thing. Debit cards on the Visa or Mastercard network face the same cross-border assessment for purchases and ATM withdrawals abroad. Visa charges 1% on foreign ATM withdrawals that involve a currency conversion and 0.8% when no conversion is needed. That comes on top of any flat surcharge from the ATM operator and any out-of-network fee from your own bank.
The total cost of an overseas cash withdrawal adds up quickly. Between the ISA fee, your bank’s foreign transaction fee, the ATM operator’s flat charge, and a possibly unfavorable exchange rate, a $200 withdrawal can cost $10 to $15 in combined fees. If your bank doesn’t waive foreign ATM charges, pulling out larger amounts less frequently keeps the flat portion of those fees from repeating.
Finding the Fee on Your Statement
Most banks don’t break out the ISA fee as its own line. They bundle it with their own markup into a single “foreign transaction fee.” You’ll usually see it either as a percentage listed directly under the international purchase or in the monthly fees summary section of your statement.
Some banking apps let you tap a transaction to see a cost breakdown, which may separate the network assessment from the bank’s cut. If yours only shows the bundled figure, you can still estimate the ISA portion by knowing your card’s network. A 3% foreign transaction fee on a Visa card likely includes 1% to 1.4% going to Visa and the rest going to your issuer.
Your card agreement discloses the total foreign transaction fee percentage. Federal rules require credit card issuers to list transaction charges in the account-opening disclosures that come with every new card.5eCFR. 12 CFR 1026.6 – Account-Opening Disclosures For debit cards, the Electronic Fund Transfer Act requires a similar upfront disclosure of any fees tied to electronic transactions.6eCFR. 12 CFR Part 1005 – Electronic Fund Transfers (Regulation E)
How to Avoid or Reduce ISA Fees
The most direct fix is a card that waives foreign transaction fees entirely. Dozens of credit cards from major issuers absorb both the network assessment and their own markup. Cards widely known for this include the Chase Sapphire Reserve, Chase Sapphire Preferred, Capital One Venture X, Capital One Venture Rewards, the American Express Gold Card, the American Express Platinum Card, and every Discover card.2Discover. How to Avoid Foreign Transaction Fees Capital One is worth calling out because it waives foreign transaction fees across nearly its entire lineup, not just its premium products.
Beyond picking the right card, a few habits help:
- Decline dynamic currency conversion. Always pay in the local currency so the merchant’s markup doesn’t stack on the ISA fee.
- Watch for online charges from foreign processors. If a foreign transaction fee shows up on a purchase from a site you thought was domestic, that’s confirmation. You can then decide whether to keep using the vendor or find a U.S.-based alternative.
- Use a debit account that reimburses foreign ATM surcharges and waives its own foreign transaction fee. That keeps your cash cost close to the network’s wholesale exchange rate.
- Carry a backup card on a different network. Mastercard’s cross-border fee is lower than Visa’s in most scenarios, so one of each gives you the cheaper option for a given transaction.
For anyone who travels or shops internationally on a regular basis, the savings from a no-foreign-transaction-fee card usually cover any annual fee several times over.