I'm a Korean resident with a US LLC — do I pay Korean income tax on LLC income?

Korean tax residents are subject to comprehensive income tax on worldwide income. A US LLC owned by a Korean resident generates foreign-source income that must be reported on your Korean global income tax return (종합소득세 신고). The US-Korea tax treaty's foreign tax credit provisions may reduce double taxation, but Korean tax liability is likely. Consult a Korean certified tax accountant (세무사).

Does the US-Korea tax treaty affect my Form 5472 obligation?

No. The US-Korea tax treaty governs income taxes, not information return filing requirements. Form 5472 is a US information return with no associated tax payment — treaty provisions cannot be used to avoid this filing obligation.

Do I need to register my US LLC with Korea's National Tax Service (NTS)?

Korean tax residents who earn foreign-source income (including from a US LLC) must report that income on their comprehensive income tax return. Additionally, Korean residents who hold overseas financial accounts exceeding KRW 500 million (approximately USD 380,000) in aggregate must file an Overseas Financial Account Report (해외금융계좌신고) with the NTS by June 30 each year.

Can I use my Korean Resident Registration Number (주민등록번호) on Form 5472?

No. Your Korean Resident Registration Number (RRN/주민등록번호) is a Korean identifier not accepted by the IRS. You need a US ITIN for Form 5472. Apply using IRS Form W-7 with your Korean passport.

I'm a Korean startup founder who received US accelerator funding — does that affect Form 5472?

If your US LLC received investment from a US accelerator (e.g., Y Combinator, 500 Startups) and issued equity in return, that transaction is not a typical Form 5472 reportable transaction with a foreign related party — it's a transaction with an unrelated US investor. However, any transactions between you (the Korean founder) and the LLC (your personal contributions or withdrawals) remain reportable on Form 5472.

Form5472.ai

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Form 5472 for South Korean LLC Owners

South Korean entrepreneurs and Korean companies with U.S. LLCs can review when Form 5472 may apply, plus NTS interaction and U.S.-Korea filing considerations.

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