Foreign Exchange Transactions Act
FX Act · Foreign Exchange Act · Korean capital controls
Korea's law on money crossing its borders, such as overseas wires and currency exchange; a big reason won cannot simply be sent abroad for kimchi arbitrage.
Simple explanation
Background: The kimchi premium persists partly because won cannot flow freely in and out of Korea. The Foreign Exchange Transactions Act (외국환거래법) is the law behind those limits, and it comes up whenever Koreans try to fund overseas crypto purchases with won.
The act has been in force since 1999, replacing the older Foreign Exchange Management Act. In principle it frees foreign-currency deals and cross-border flows, but it keeps checks, filings and reports so that the currency market stays stable and illicit money does not slip through. An individual sending money abroad has to go through a bank or another licensed foreign exchange institution, which checks who is sending it and why and logs the transfer on the Bank of Korea's foreign exchange network. Depending on the type and size of the deal, supporting documents or advance filings may be needed.
Remittances without supporting documents have a yearly cap. Under a government announcement of December 2025, from 2026 the cap is US$100,000 per person per year with banks and non-banks (small remittance firms, brokerages, card companies) combined, and remitters check each person's running total in real time through the Overseas Remittance Integrated System (ORIS). Beyond the cap you need documents proving the reason and amount; the announcement also said that once the cap is used up, repeated transfers split into US$5,000 or less are reported to the National Tax Service and the Korea Customs Service. Caps and procedures can change, so ask your bank before sending.
The trouble starts when the money is meant to buy crypto. According to 2022 reporting, banks' remittance reason codes had no entry for crypto purchases, and bank counters often turned such transfers down; the Bank of Korea said the legal nature of crypto was unclear. So kimchi arbitrage that wires won abroad, buys coins on an overseas exchange and sells them back in Korea tends to stall at the wiring stage, and dressing up the paperwork to wire more is itself a breach of the law.
It has happened on a large scale. In 2022, huge outbound wires disguised as import payments came to light at Korean banks; the Financial Supervisory Service inspected 12 banks and one futures firm and found US$12.26 billion (about ₩16 trillion) of abnormal foreign-currency remittances. Much of the money went out through newly founded firms with no trading record, a large part of it came through Korean crypto exchanges, and the regulators concluded it was kimchi premium arbitrage. The financial firms that handled the transfers received heavy sanctions such as partial business suspensions, and prosecutors and customs indicted several people, including a former bank branch manager, for breaking the act and other laws.
Hwanchigi, informal currency transfers that bypass the banks, is another recurring problem: it counts as running a foreign exchange business without registration, which the act punishes. Buying coins on an overseas exchange and selling them on a Korean one has become a favorite hwanchigi route. Customs figures given to a lawmaker's office and reported in July 2026 put crypto-based hwanchigi detected at ₩4.7566 trillion (about $3.4 billion) in 2022, ₩1.4454 trillion in 2023, ₩1.0575 trillion in 2024 and ₩2.3574 trillion (about $1.7 billion) in 2025. In April 2026 one customs office said it had caught a ring that, from 2021 to 2024, ran about ₩300 billion (about $214 million) of illegal transfers this way while also pocketing kimchi premiums of up to 15%, and it warned the public never to use such services.
Not every cross-border coin movement breaks the act, though. In August 2026 an appeals panel of the Suwon District Court overturned a conviction and acquitted a man who had received crypto from abroad, sold it for won on a Korean exchange and passed the money to recipients in Korea, holding that this alone did not prove a foreign exchange business: prosecutors had to show a foreign-exchange link, such as the crypto being bought with foreign currency. How crypto fits the foreign exchange rules is still being settled case by case.
The rules keep moving. An amendment to the act promulgated in June 2026 is due to take effect on December 3, 2026. Firms that handle cross-border crypto transfers must register in advance with the Ministry of Economy and Finance as "virtual asset transfer operators" and report the transfers to the Bank of Korea's foreign exchange network. The draft decree published in October 2026 covers transfers between Korean and overseas exchanges and between Korean exchanges and personal wallets, and the reports are shared with the National Tax Service, the Korea Customs Service, the Financial Supervisory Service and the Financial Intelligence Unit for investigating illegal deals. The detailed decree and report forms were not final at the time of writing.
For the kimchi premium, the upshot is simple: won does not cross the border freely, so when buyers crowd into Korean exchanges, foreign money cannot rush in to even out prices, and Korean money cannot easily flow out to arbitrage the gap. That is a main reason the premium lasts. The other way to get dollars in Korea, buying Tether, gets dearer than the exchange rate when demand surges (the Tether premium). CoinGaja's Kimchi Premium Calculator takes trading fees, withdrawal fees and slippage off, but not the cost of getting dollars (bank exchange and wire fees, or the Tether premium) or price moves during the transfer. The Live Tether premium page shows how much more than the exchange rate it costs to buy dollars as Tether in Korea. This is general information, not legal advice; check with your bank or a professional before any deal that involves sending money or coins across the border.
Example
Yearly cap on remittances without documents US$100,000 × rate ₩1,400 = ₩140,000,000 (2026, banks and non-banks combined)
If the bank sells you dollars at ₩1,414 (+1.00% over the market rate) → US$100,000 costs ₩141,400,000
Coins bought abroad with US$100,000 and sold in Korea at a +5.00% premium → 100,000 × 1,400 × 1.05 = ₩147,000,000 → gap 147,000,000 − 141,400,000 = ₩5,600,000 (about $4,000), before fees and price moves in transit
To make that gap 100 times bigger you would have to wire US$10 million → anything over the cap needs documents proving its purpose, and faking them can lead to prosecution under the act
The abnormal remittances found in 2022: US$12.26 billion (about ₩16 trillion), disguised as import payments and sent through 13 financial firms
※ Example numbers, for illustration only
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