Living in Korea does not automatically mean that you must report every bank or investment account in another country. Nationality does not decide the question either. For the report filed in 2026, you need to check your Korean tax-residence status at the end of 2025, the exemptions that apply to some foreign residents, and the combined value of your overseas financial accounts at each month-end in 2025.
The basic rule is precise: a person who is a Korean tax resident and is not exempt must report if the combined balance of reportable overseas financial accounts exceeded KRW 500 million on any month-end. The 2026 filing period was June 1–30, 2026.
Checked: September 3, 2026, against the National Tax Service's 2026 guidance and the current statutes. This article explains the screening process; it is not individual tax advice. Residence, treaty, trust, beneficial-ownership, or late-filing questions can require a Korean tax professional.
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| General illustration, not individual tax advice. Reporting rules, exemptions, thresholds, and filing periods should be checked against current National Tax Service guidance. |
The three-question screening test
| Question for the 2026 report | If yes | If no |
|---|---|---|
| Were you a Korean tax resident on December 31, 2025? | Check the exemptions. | An individual generally is not an account-reporting obligor for 2025. |
| Does an exemption apply, including the limited-period foreign-resident exemption? | Keep the facts and records supporting the exemption. | Calculate all 12 month-end totals. |
| Did the combined reportable balance exceed KRW 500 million on at least one month-end? | A report was generally required by June 30, 2026. | The balance test was not met for that year. |
Do not skip a step. For example, a Korean tax resident can still be exempt as a qualifying short-term foreign resident. A foreign citizen who has lived in Korea for more than five of the previous ten years may no longer have that exemption.
Step 1: determine tax residence at year-end
The reporting rule uses your status at the end of the year being reviewed. For the 2026 filing, the date is December 31, 2025.
The Income Tax Act defines a resident as a person who has a domicile in Korea or has had a place of residence here for at least 183 days. Domicile is a factual test that can consider family, occupation, and assets. This means “I stayed fewer than 183 days” is not always enough to prove non-residence, and an immigration visa label does not settle tax residence.
If another country also treats you as resident, the residence article in the relevant tax treaty may need to be applied. From accounts held in 2025, a person recognized as a resident of the treaty partner under the treaty is included among Korea's statutory reporting exemptions. This is a technical conclusion, not something to claim from a passport or overseas address alone.
Step 2: check the foreign-resident exemption
The National Tax Service's 2026 guidance lists a foreign-resident exemption for a foreign national whose combined period of having a domicile or place of residence in Korea is five years or less during the ten-year period ending on December 31, 2025.
Keep a dated residence timeline. Include earlier periods in Korea, not only the current visa or current employment. Entry and departure records can help, but “domicile” and “place of residence” are tax-law concepts, so a difficult case should be reviewed professionally.
Do not confuse this rule with the separate exemption for a Korean national residing abroad. The 2026 NTS guidance describes that exemption using 182 days or less of Korean residence during the one-year lookback. It is not the test for an ordinary foreign-national resident.
Other statutory exemptions can cover certain international-organization employees, government and supervised institutions, some account-related persons whose complete information is reported by another person, qualifying overseas-trust filers, and treaty-partner residents. Each has conditions.
Step 3: test every month-end, not December alone
Prepare the total for January 31, February 28, and every remaining month-end through December 31. Convert each reportable asset to won using the applicable daily basic or cross rate and then add all accounts together.
The threshold is more than KRW 500 million. A total of exactly KRW 500 million does not exceed it. A balance above the threshold in the middle of a month does not by itself meet this particular test if no month-end total exceeded it.
| Example month-end | Combined balance | Result |
|---|---|---|
| January 31 | KRW 430 million | Below threshold |
| February 28 | KRW 520 million | Threshold exceeded |
| March 31 | KRW 470 million | Below threshold |
In this example, a report is required if the person is an unexempt resident. February 28 is the reporting reference date because it has the highest combined month-end balance. The NTS instructs the filer to report the reportable accounts and assets held on that date, with their balances on that date.
What can count as an overseas financial account?
The account must be opened with an overseas financial company or qualifying overseas virtual-asset service provider. Reportable assets can include:
- cash, checking, savings, and term deposits;
- listed shares and depositary receipts;
- bonds, funds, and similar collective-investment products;
- derivatives;
- insurance products with a reportable account value; and
- virtual assets kept or managed through an overseas provider account.
An account at a Korean financial institution is not made “overseas” simply because it holds foreign shares. Conversely, an account opened at an overseas financial institution can be in scope even if it holds won or Korean securities. The location and nature of the account matter.
Directly owned foreign real estate is not itself a financial account. Foreign property, overseas corporations, and overseas trusts can create separate Korean tax or information-reporting duties, so excluding an item here does not mean that no other filing applies.
How to value different assets
Use the NTS asset-specific rules instead of copying an app's current portfolio total. Cash uses the balance at the close of the month-end. Listed shares and bonds generally use month-end quantity multiplied by the closing price, or the previous trading day's closing price when the month-end is not a trading day. Funds use the applicable standard or redemption price. The 2026 NTS guidance values reportable insurance products by the amount paid in and overseas virtual assets by the relevant provider's month-end final price.
Keep both the foreign-currency figure and the won conversion. Save the price source, exchange rate, date, and calculation. A strong worksheet has one row per account and one column per month-end.
Joint, nominee, and beneficially owned accounts
For a joint account, each joint holder is generally treated as holding the entire balance rather than a divided share. The same reporting chapter treats both the named holder and the beneficial owner as account-related persons when the account name and real ownership differ.
There is a narrow exemption when another related person's filing makes all of your overseas-account information available to the tax authority. Do not assume that a spouse's, business partner's, trustee's, or company filing automatically covers you. Confirm that the filing contains the complete required information and that the exemption conditions are met.
Build the records before opening Hometax
- Your passport, foreigner registration number, Korean address, and tax-office jurisdiction
- A ten-year Korean residence timeline and documents supporting any exemption
- Financial institution name, country, account type, account number, and holders
- All 12 month-end statements or transaction records
- Month-end quantities and prices for securities, funds, insurance, and virtual assets
- Daily basic or cross exchange rates used for each month-end
- Documents explaining joint ownership, nominee ownership, trusts, or corporate control
Do not send account passwords, seed phrases, or one-time codes to an adviser. Statements and calculation records are enough for review.
How to file
The NTS accepts electronic filing through Hometax or Sontax and paper filing with the tax office responsible for the taxpayer's place of taxation. The 2026 NTS route is:
홈택스·손택스 → 증명·등록·신청·사업장현황 → 소득·법인세 관련 신청·신고 → 해외금융계좌 신고
The return identifies the filer, the overseas financial institution, account number, highest month-end total, account-by-account balance on the reference date, and relevant joint holders, named holders, or beneficial owners. Filing is annual; an unchanged account that still meets the next year's conditions must be reviewed and reported again.
If the June deadline was missed
Do not wait for a notice. A person who did not file can make a late filing before the tax authority imposes the penalty. A person who filed but understated information can submit an amended report before the penalty is imposed.
Under the current Enforcement Decree, a late filing can reduce the account-reporting penalty by 90% within one month after the deadline, 70% after one month but within six months, 50% after six months but within one year, and 30% after one year but within two years. The amendment schedule is different: 90% within six months, 70% after six months but within one year, 50% after one year but within two years, and 30% after two years but within four years. The reduction does not apply in the same way if the filer already knew that the authority was about to impose the penalty.
Before submitting, verify which report year, filing type, and reduction period apply to your facts. Keep the electronic receipt and a copy of the completed form.
Possible penalties
The NTS states that non-reporting or under-reporting can lead to a penalty equal to 10% of the unreported or understated amount, capped at KRW 1 billion. Failing to explain the source of the amount when lawfully requested, or giving a false explanation, can bring an additional 10% penalty.
If the unreported or understated amount exceeds KRW 5 billion, public disclosure and criminal consequences can also be possible. Those are maximum-risk rules, not a prediction of the result in a particular case. Early, accurate correction is more useful than trying to guess whether the NTS will contact you.
The account report is not a tax on the balance
This filing discloses qualifying accounts and balances. It does not by itself impose income tax on the entire KRW 500 million. Tax on interest, dividends, capital gains, virtual-asset transactions, trust income, or other foreign-source income is a separate analysis.
The limited taxation rule for some short-term foreign residents, foreign tax credits, treaty provisions, and payroll year-end settlement do not replace the overseas-account screening process. Automatic information exchange between tax authorities also does not substitute for a return that Korean law requires you to file.
When to get individual advice
Professional review is especially sensible when you:
- may be resident in both Korea and another treaty country;
- are close to the five-year-in-ten foreign-resident limit;
- hold accounts through a trust, foundation, partnership, or controlled company;
- share or manage an account that is not in your name;
- use an overseas virtual-asset platform, custody service, or wallet structure;
- crossed the threshold but missed June 30; or
- also earned income or sold property outside Korea.
For general English-language assistance, the NTS foreigner helpline lists 1588-0560, Monday to Friday, 9:00 a.m.–6:00 p.m., excluding 11:30 a.m.–1:00 p.m. For a conclusion about your filing position, ask a Korean tax professional to review the documents rather than only describing the situation by phone.
Related guides
- Can Foreign Residents Open KakaoBank? Salary Account Alternatives
- Korea Residence Card: Registration, Documents, and Fees
- Korea National Pension Refund: Eligibility and Application Guide
Official sources
- National Tax Service — Overseas Financial Account Reporting
- National Tax Service — 2026 Filing Guidance and Examples
- National Tax Service — Individual Income Tax and Benefit Guide for Foreigners 2026
- National Law Information Center — Adjustment of International Taxes Act, Articles 52–57 and 90
- National Law Information Center — Enforcement Decree of the Adjustment of International Taxes Act
- National Law Information Center — Income Tax Act, Definition of Resident
- National Law Information Center — Overseas Financial Account Report Form
- National Tax Service — Hometax
- National Tax Service — Foreigner Helpline and Q&A
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