Korea’s currency declaration rule centers on one number, USD 10,000, but which version of the rule applies to you depends on which direction you’re traveling and, in some cases, who you are.
Bringing money into Korea
Below the threshold, there is nothing to do: “If you bring in means of payment not exceeding USD 10,000 to Korea, you do not need any permission or declaration.” Above it, the Korea Customs Service is direct: “if you enter the country with foreign currency, KRW notes, or checks above USD 10,000 or the equivalent in total, you must report it to the Customs. The same goes for cashier’s checks in Korean won.”
Taking money out of Korea
The default, for residents and non-residents alike, mirrors the entry rule: “If Korean residents or non-residents carry means of payment (means of international payment, KRW notes, or cashier’s checks) less than USD 10,000 out of Korea, no report is required.”
Above that amount, the published rule is written specifically for Korean nationals: “if a resident of Korean nationality transports means of payment (means of international payment, KRW notes, or cashier’s checks) that exceeds USD 10,000 for general overseas travel expenses, he or she can take it with him or her if he or she reports it to the head of the competent Customs office.”
A different process for relocation, study, and travel-agency money
A separate category of traveler faces a different requirement — a bank confirmation rather than a customs declaration:
If overseas Koreans, Korean expatriates, overseas students, and travel agents carry overseas travel expenses exceeding USD 10,000, or if a foreign resident intends to leave the country with earned income in Korea, he/she must obtain confirmation from the head of the foreign exchange bank (in this case, there is no separate customs declaration, but a certificate of confirmation must be presented at the request by the Customs office).
This applies to a specific set of people and purposes — overseas Koreans, Korean expatriates, overseas students, travel agents, and foreign residents leaving with income earned in Korea — not to every departing traveler over the threshold.
How you actually report it
When a report is required, the mechanics are simple: “Mark yes on no. 3 of Traveler Declaration Form with entering specific amount, submit it to Customs official, and receive The Certificate of Foreign Currency Declaration.” Timing matters here, and the source is explicit about it: “The Certificate of Foreign Currency Declaration cannot be issued after entering Korea (after leaving the immigration).” Once you’ve cleared immigration, that document is no longer available to you.
The penalty for skipping the report
The consequence for not reporting is stated plainly, without qualification:
Any person who export or import any means of payment including foreign currency without filing a report shall be punished by imprisonment with labor not more than 1 year or by a fine (Article 32 of the Act) not exceeding one hundred million won
That is a real criminal penalty attached to a paperwork requirement, and the source states both the maximum prison term and the maximum fine directly.
Ordinary tourists aren’t covered by either rule
The rules on the page cover Korean nationals departing over the threshold (a Customs report) and a defined set of people leaving with Korea-earned income or relocation funds (a bank confirmation). What they don’t spell out is which of these applies to an ordinary non-Korean tourist departing with more than USD 10,000 that isn’t Korean-earned income — that specific scenario isn’t addressed on Korea Customs’ own page. If that’s your situation, it’s worth confirming directly with Korea Customs before you fly, rather than assuming either process applies to you by default.