The general rules of foreign compliance are strict, but when applied to South Korea, the interaction between the two tax systems becomes unique.
For Washington residents with family or business ties to Korea, navigating the asset corridor between Seoul and Seattle requires careful attention. Whether managing family assets in Gangnam or addressing a dormant pension account, the specific details of the US-Korea tax treaty and reporting requirements are critical.
The following five scenarios are frequently encountered by high-net-worth individuals.
1. Inheriting Property in Seoul and Dual Taxation
Inheritance often creates significant confusion because the US and Korea tax different aspects of wealth transfer using different methodologies.
The Korean Rule
Korea currently uses an estate-based inheritance tax approach. This means the tax is calculated on the total value of the decedent’s estate before distribution. While the heirs are responsible for filing and paying the tax under Korean rules, the rate is determined by the size of the total estate, not just an individual share. Korea has discussed shifting to a recipient-based model in the future, but the current law remains estate-based.
The US Rule
The US imposes an estate tax (if applicable) on the decedent’s estate. The US generally does not tax the recipient on the receipt of the inheritance as income.
The No Credit Interaction
A common misconception is that inheritance tax paid to Korea can be used as a foreign tax credit to offset US income tax. Generally, this is not possible because the US foreign tax credit typically applies to qualifying foreign income taxes, while Korean inheritance tax is a wealth transfer tax. As a result, the beneficiary often pays Korean tax out of pocket and receives the remaining assets without US income tax on the receipt. The receipt may still be reportable on Form 3520 if the applicable thresholds (including aggregation rules) are exceeded.
Separately, in certain situations involving a US decedent and US estate tax exposure, the US tax system may allow an estate-level foreign death tax credit under US estate tax rules. This is distinct from an income tax foreign tax credit claimed by a beneficiary.
2. Selling a Korean Apartment and Capital Gains
When selling an inherited apartment or a property that was previously a primary residence in Korea, the US tax calculation presents unique challenges.
If the taxpayer owned and lived in the apartment as their main home for two of the last five years, they can typically exclude up to $250,000 (Single) or $500,000 (Married Filing Jointly) of gain from US taxation, assuming the other statutory requirements are met. This is similar to a home sale in Washington.
The Exchange Rate Phantom Gain
US tax reporting is generally performed in US dollars. For a US taxpayer whose functional currency is the US dollar, basis components and sales proceeds are commonly translated into dollars using exchange rates that reflect when amounts were paid, incurred, or received. Exchange rate movement can therefore create a phantom gain or loss for US tax purposes, even if the property’s value in won remained flat.
In inherited-property situations, the US basis analysis often starts with fair market value at the relevant valuation date, which can materially change the gain calculation compared to a simple purchase price framework.
3. The Jeonse Deposit and Reporting Risks
The Jeonse system, a large lump-sum lease deposit, is unique to Korea and creates a complex reporting situation for US residents.
FBAR and FATCA Distinctions
A Jeonse deposit is typically a private contract with a landlord rather than a custodial account at a financial institution. Consequently, many positions hold that it is not reportable on the FBAR because FBAR is centered on foreign financial accounts.
However, FATCA (Form 8938) is broader and covers specified foreign financial assets, which can include certain financial instruments or contracts with non-US persons when held for investment and not held in an account. Depending on the facts and how the arrangement is characterized, a Jeonse right-to-refund may be reviewed for potential Form 8938 reporting.
The Cash Flow Risk
Even if the deposit itself is not treated as reportable, the cash used to fund it before transfer, or the refund received after the lease ends, lands in a bank account. That bank account is reportable if it exceeds the applicable aggregate thresholds.
4. Transferring Large Sums from Korea to the US
Moving proceeds from a property sale or inheritance to the US often triggers scrutiny from both Korean banks and US compliance officers.
US financial institutions maintain anti-money laundering programs and commonly review large or unusual international transfers. Sudden large wires from overseas can trigger internal requests for documentation.
Documentation Protocol
Before initiating a wire, it is advisable to prepare a source-of-funds packet. This can include English translations of the real estate sale contract or inheritance documents, proof of tax payment in Korea when applicable, and a clear letter of explanation regarding the transaction.
In addition, Korea’s foreign exchange framework and bank practices often require submission of evidential documents showing the reason for and amount of payment. Depending on the size and nature of the transfer and bank policy, additional verification or tax-related proof may be requested before an outbound transfer is authorized.
5. Korean National Pension (NPS) and US Taxation
Individuals who worked in Korea before moving to the US often hold accounts with the National Pension Service.
US permanent residents or citizens may be eligible to withdraw contributions as a lump sum upon leaving Korea. The US and Korean tax outcomes depend on how the payment is classified and whether treaty provisions apply.
The Treaty and the Saving Clause
While the US-Korea tax treaty addresses pensions and public pension-type payments, it also contains a saving clause that generally permits the US to tax its citizens and residents as if the treaty did not exist, subject to specific exceptions. For Korean public pension or social security-type payments, the treaty may assign taxing rights to Korea, and the saving clause analysis (including carveouts) becomes central.
Taxpayers should not assume Korean withholding can simply be turned off, and they should also not assume the payment is generally taxable in the US without treaty classification. A detailed review of the relevant treaty provisions and the taxpayer’s status is required to determine whether withholding relief is appropriate at the source, whether a US treaty-based return position is required, or whether a foreign tax credit (where applicable) is the practical mechanism to mitigate double taxation.
Disclaimer: This article is for general information purposes only and does not constitute legal or tax advice. The interaction between US and Korean tax laws is complex and subject to change. Please consult with a qualified CPA or tax attorney regarding your specific situation.