A parent passes away in Korea, and a Korean inheritance comes to their US-based child. The instinct is to assume the IRS wants a cut. Most of the time, it doesn’t — at least not the way people expect.
The real obligation isn’t a tax bill. It’s a reporting form most heirs never hear about until years later, when the penalty notice shows up instead.
How US Estate Tax Actually Treats a Korean Inheritance
US estate tax is assessed against the decedent’s estate, not the person receiving the inheritance. Your parent in Korea was a Korean citizen and resident, not a US person. Their estate generally isn’t subject to US estate tax at all, regardless of the amount involved.
There’s a narrow exception. If the decedent owned US-situs assets directly — US real estate, or stock in a US company held in their own name — those specific assets can fall under US estate tax rules for nonresident aliens, which carry a far smaller exemption than what applies to US citizens. Korean bank accounts, Korean real estate, and Korean stock holdings don’t count as US-situs assets, so this exception rarely applies to a typical inheritance from Korea.
Takeaway: Inheriting a Korean estate almost never triggers US estate tax. The exception is US-based property the decedent owned directly.
The Real Obligation: Reporting the Korean Inheritance on Form 3520
Here’s what actually applies. A US person who receives more than a set threshold from a foreign estate or foreign individual in a year must report it to the IRS on Form 3520. This is an information return, not a tax return — you’re not paying tax on the money itself. You’re just telling the IRS it arrived.
Skip the filing, and the penalties get serious fast: typically 5% of the unreported amount per month it’s late, capped at 25% of the total, per the IRS instructions for Form 3520. On a $300,000 inheritance, that cap alone is $75,000 — for a form that doesn’t even calculate any tax owed.
Takeaway: Form 3520 isn’t optional paperwork. The penalty for skipping it can dwarf any tax you’d have owed on a domestic inheritance of the same size.
What Counts as a Reportable Korean Inheritance
The reporting requirement isn’t limited to cash landing in your US bank account. It covers the full range of what you might receive:
- Cash transferred directly from a Korean estate or executor
- Proceeds from selling inherited Korean real estate
- Korean stock or brokerage holdings transferred into your name
- Property you inherit and continue to hold in Korea, even if you never bring the value to the US
That last point catches people off guard. You still have a reporting obligation even if the inherited apartment in Seoul stays in Korea and you never sell it or move a dollar.
Takeaway: The reporting duty follows the value you received, not whether you brought it into the US.
Common Mistakes Korean-American Heirs Make
A few patterns show up again and again with Korean inheritances specifically:
- Assuming no US tax means no US filing requirement — the filing requirement exists independent of any tax due
- Filing late because probate in Korea drags on, without realizing the Form 3520 clock still runs from the tax year the funds became available
- Splitting an inheritance among siblings and assuming the threshold applies to the total, when it actually applies per US person receiving funds
- Forgetting FBAR and FATCA reporting entirely once inherited funds sit in a Korean bank account under your name — our FBAR versus FATCA breakdown covers that separate obligation in full
Takeaway: Most mistakes come from assuming “no tax owed” means “nothing to file.” The two are unrelated questions.
When a Gift Looks Like an Inheritance But Isn’t
Sometimes money arrives from a living parent rather than an estate, and gets treated the same way in someone’s head. It shouldn’t be. Lifetime gifts from a nonresident alien are generally not subject to US gift tax either, for the same reason inheritances usually aren’t — but they still trigger the same Form 3520 reporting duty once they cross the threshold. We break down exactly how that works in our guide to gift tax when Korean parents send money for a down payment, and the filing mechanics are nearly identical to what applies here.
Takeaway: Whether the money is a gift or an inheritance, the reporting question is the same: did it cross the threshold in a single year?
FAQ
Do I owe US tax on money I inherit from a Korean bank account?
Generally, no. The estate tax obligation belongs to the decedent’s estate, and a Korean bank account isn’t a US-situs asset. You still have to report the amount received on Form 3520 if it crosses the threshold.
What if my Korean inheritance is spread across several years?
Each tax year is assessed separately against the threshold. Receiving funds in installments across multiple years, rather than a single lump sum, can change whether any individual year requires a filing.
Does converting the inherited won to dollars change anything?
No. The reporting requirement is based on the fair market value of what you received, regardless of currency. Currency conversion timing affects the exact dollar figure you report, not whether you have to report it.
Can I file Form 3520 myself, or do I need a professional?
The form itself isn’t overly complex, but the stakes of getting the threshold calculation or filing deadline wrong are high given the penalty structure. Most people use a tax preparer experienced with foreign inheritance reporting, especially for a first-time filing.
Quick Summary
- A Korean inheritance almost never triggers US estate tax, since the decedent wasn’t a US person
- The real requirement is Form 3520 — an information return, not a tax bill
- Missing the deadline risks a penalty of up to 25% of the unreported amount
- The reporting duty applies even if the inherited property stays in Korea untouched
None of this is professional advice — just what I researched and pieced together myself. Tax and immigration rules shift often, so double-check anything that affects your actual filing with a licensed professional.