Korea's Exchange Fee — 2,500 Won per $100, Where It Goes, and How to Pay Less (2026)

There is a reason “no exchange fee” still leaves you feeling shortchanged: the cost is sitting in the exchange rate, not the fee box.

So this article answers three things. How much you actually lose, where the money leaves, and how to pay less of it. The figures are traced from what two Korean banks printed on their own currency-exchange screens.

What does changing $100 cost you?

The short answer for US dollar cash is about 25 won per dollar. Traced back from two bank apps, the figures came out at 24.98 and 25.30 won — roughly 1.73% and 1.75%. In money:

Amount exchanged	No preferential rate	With a 90% preferential rate	Difference
$100	about 2,500 won	about 250 won	2,250 won
$500	about 12,500 won	about 1,250 won	11,250 won
$1,000	about 25,000 won	about 2,500 won	22,500 won
$3,000	about 75,000 won	about 7,500 won	67,500 won

Change $3,000 for a trip and the preferential rate alone decides 67,500 won. None of it appears anywhere labelled “fee.” It is inside the rate.

And a 90% preferential rate does not take it to zero. It takes 1.73% to 0.17%. On $3,000 that still leaves about 7,500 won.

Where does the money leave?

The rate printed large at the top of the app screen is the answer. Here is one screen exactly as it appeared.

What the screen showed	Value
Large, at the top	USD 1 = KRW 1,471.30 (▼ −0.50)
Amount	USD 100 = KRW 147,130
Preferential rate	1,448.53 won
Amount discounted	2,277 won (90% preferential)
Estimated debit	144,853 won

The screen shows neither the base rate nor the spread. But if “90% preferential” means 90% off the fee, then what is left is the remaining 10% of that fee — so the original fee can be worked backwards.

Check	Calculation	Screen
① Won amount	100 × 1,471.30 = 147,130	147,130	matches
② Estimated debit	100 × 1,448.53 = 144,853	144,853	matches
③ Amount discounted	147,130 − 144,853 = 2,277	2,277	matches
④ The rate at the top	base 1,446.00 + fee 25.30 = 1,471.30	1,471.30	matches to two decimals

The fourth row is the point. “USD 1 = KRW 1,471.30,” printed large at the top, equals “base rate plus fee” to two decimal places. That number is not today's exchange rate — it is the bank's selling price with the fee already in it.

At the same moment the base stood at 1,446.00 while the app displayed 1,471.30. A gap of 25.30 won. Reading the top of the screen as “today's rate” means reading a fee as a rate.

Ninety percent of what?

What gets discounted is not the rate but the fee layered on top of it. The industry calls that fee the spread, and the customer rate is built as base rate ± spread. Today’s published base rate, currency by currency, is on the exchange rate page.

Which is why the preferential percentage on its own tells you nothing. If the underlying fee differs, the same 90% lands somewhere different.

Underlying fee	With the preferential rate	What you actually pay
1.75%	1.75% × (1 − 0.9)	0.175%
1.0%	1.0% × (1 − 0.9)	0.1%
0.5%	0.5% × (1 − 0.5) — only 50% off	0.25%

Look at the third row. Fifty percent off a low fee can beat ninety percent off a high one. “What preferential rate do I get?” is a question that cannot be answered usefully.

Even the reference rate differs by bank

The definition above says banks add a spread to the base exchange rate. Yet the bottom of another bank's screen carried this line in small type:

Traced the same way, the two screens sit side by side like this.

Traced value	Screen A	Screen B
Base rate (reverse-engineered)	1,445.10 won	1,446.00 won
Underlying fee	24.98 won	25.30 won
Fee rate	about 1.73%	about 1.75%
Still paid after 90% off (on $100)	about 250 won	about 253 won
What the screen called its reference	“a cost rate, not the base exchange rate”	no such note — “the currently posted rate”

Both landed in the 1.7% range, so roughly 1.7% is a fair working figure for US dollar cash. But under the identical phrase “90% preferential,” what the 90% applies to differs — the reference rate, the underlying fee, the currency and the qualifying conditions can all vary.

Worth knowing too: the base exchange rate is yesterday's average. Trades on the Seoul FX market between 9:00 and 15:30, weighted by volume, are posted as the next business day's base rate. Even the reference line you see at the counter is a day behind. (That method changes on 1 January 2027 to a time-weighted average around 16:00.)

So how do you pay less?

Everything above converges on one rule: comparison works only on the final amount. Conveniently, that number is already printed large on the screen — the “USD 100 = KRW 144,760” line.

Step	What to do
①	Ask “how many won for $100?” Compare that figure across banks, not the preferential percentage
②	Do not read the rate at the top as today's rate. It is a selling price with the fee in it
③	Ask how long the offer runs. Some terms apply to a first transaction only
④	Compare hardest on large amounts. On $3,000 the preferential rate alone is worth over 60,000 won
⑤	Do not take “no fee” at face value. The regulatory material below addresses exactly this

For remittances, the transfers article covers cancellation and error-resolution rights; costs on card payments abroad are in overseas payment fees. Run the numbers in the remittance calculator.

Why “no fee” is a regulatory matter

This is not just an industry habit. The US Consumer Financial Protection Bureau has put it in writing.

The same agency sets out what must be disclosed before a transfer, and the list targets this precisely — “the total cost, including taxes and fees,” “the exchange rate, if applicable,” and “the total amount expected to be delivered to the recipient.” The third is the decisive one: fees and rates read separately settle nothing, so produce the single number that combines them.

There is a warning on promotions too. Advertising a “no fee” offer or a promotional rate without adequately disclosing that it is temporary or limited in scope is also flagged — because consumers may not understand that the cost rises after the first transaction.

These are US rules and do not apply directly in Korea, but the structure of hiding the cost in the rate is the same. The two screens traced above are the evidence.

Questions people ask

How much is the exchange fee?

About 25 won per dollar on US dollar cash, or roughly 1.7%. That is about 2,500 won on $100 and about 25,000 won on $1,000, falling to a tenth of that with a 90% preferential rate. These come from two screens and will vary by bank and by moment.

Isn't 90% off basically free?

No. It takes 1.75% to 0.175%, not to zero. On $3,000 about 7,500 won still goes.

Which bank is cheapest?

This article cannot say. The two screens were captured at different moments — the base rates themselves differed, 1,445.10 against 1,446.00 — so they cannot rank banks, which is why no bank name is attached to any figure here. The only accurate method is comparing “how many won for $100” at two or three banks at the same moment.

Why does the app rate differ from the news rate?

Because they are different numbers. The news quotes something close to the base rate; the figure at the top of the app is a selling price with the fee added. In the case above they stood at 1,446.00 and 1,471.30 at the same moment — 25.30 won apart.

Is paying by card better than exchanging cash?

This article covers cash exchange only. Card payments use a different rate entirely — card issuer disclosures specify “the first posted telegraphic transfer selling rate on the international processing date,” with Friday's rate applied over weekends. Those costs are in overseas payment fees.

Sources

• US Consumer Financial Protection Bureau — Consumer Financial Protection Circular 2024-02, on deceptive marketing of the speed or cost of remittance transfers (March 2024). Source for “free” being deceptive where the provider charges through exchange rate spreads, for the case of a provider advertising “no fees” while charging on every transfer, and for the warning about promotional terms whose temporary or limited scope is not adequately disclosed.
• US Consumer Financial Protection Bureau — Sending money abroad (updated December 2024). Source for the pre-payment disclosures: “the total cost, including taxes and fees,” “the exchange rate, if applicable,” and “the total amount expected to be delivered to the recipient.”
• US Federal Reserve Board — H.10 Foreign Exchange Rates (release checked 6 July 2026). Source for the existence of a published reference rate and for the “currency units per US dollar” convention. It is a reference publication, not a rate anyone transacts at.
• Yonhap Infomax (specialist financial press — not an agency text) — financial terms explainer on the base exchange rate (July 2026). Source for the definition, for “banks set customer rates by adding or subtracting a spread in the nature of an exchange fee,” for the market average rate's construction (volume-weighted across 09:00–15:30) and its posting as the following business day's base rate, and for the planned switch to a time-weighted average on 1 January 2027. The broker that computes the rate blocked access and the Bank of Korea and Financial Supervisory Service pages did not return body text, so this stood in for them.
• BC Card (card issuer disclosure — not an agency source) — overseas usage billing guidance. Source for “the first posted telegraphic transfer selling rate,” “on the international processing date,” and “Friday's rate over weekends… the previous business day's rate on public holidays.” One issuer's terms.
• Two Korean banks' mobile exchange screens (checked July 2026 — the banks' own on-screen displays, not agency sources). Screen A: USD 100 = KRW 144,760, estimated rate 1,447.60 (90% preferential), amount discounted 2,248 won, limit USD 3,000, and “the rate presented to you is calculated from a cost rate, not the base exchange rate.” Screen B: USD 1 = KRW 1,471.30, USD 100 = KRW 147,130, preferential rate 1,448.53, amount discounted 2,277 won, estimated debit 144,853 won.
• The fee figures are our own calculation. The base rates (1,445.10 and 1,446.00), the underlying fees (24.98 and 25.30 won), the fee rates (about 1.73% and 1.75%) and the table by amount ($100 at about 2,500 won up to $3,000 at about 75,000) were worked backwards from what the screens displayed; neither the banks nor any agency published them. The reverse calculation assumes “90% preferential” means 90% off the fee, and all seven check rows agreed — on Screen B down to the posted rate at the top, to two decimal places.
• What we read into it. “The rate at the top of the app is already a selling price with the fee in it” is the result of reconciling Screen B's four values; no bank describes it that way. The slight difference between the two fee rates (1.7284% and 1.7497%) looks related to the “cost rate” wording, but we could not confirm what a cost rate is, so we have not written it as cause.

Where to check further

This article goes as far as the screens and the regulatory material allow. The rest is best looked at here.

• Your own bank's qualifying conditions — ask them. Preferential rates vary with account history, product and minimum amount, and no public source set out the conditions bank by bank. Asking “how many won for $100” makes the conditions irrelevant to the comparison.
• Currencies other than the dollar — checked here, at the counter. Only US dollar cash was traced. Yen, euro and Southeast Asian currencies are understood to carry higher fees, but we could not obtain figures.
• The base rate's own source — and its 2027 change. The computing broker's site blocked access, so a press explainer stood in, and the switch to a time-weighted average on 1 January 2027 is still pending. We will update once it takes effect.

As of July 2026. The treatment of “free” and the disclosure list come from CFPB material, the definition of the base exchange rate from specialist financial press, and the fee amounts are our own reverse calculation from figures printed on bank screens. For remittance rights see the transfers article, and for card payments overseas payment fees. This is general information, not financial advice.