US Company Formation from South Korea (2026): How to Set Up a US LLC or C-Corp as a Resident or Citizen of Korea

Korean founders have more reasons than most to want a US company. Korean game studios, webtoon and K-beauty brands, and SaaS teams increasingly treat the USA as their main market. Korean startups that raise from American investors are asked for a Delaware parent. And freelance developers and designers in Seoul and Pangyo find that US clients pay faster and more readily to a US entity. All of this can be done from Korea without travelling.

The US side of the process is straightforward. The Korean side has three rules that change everything:

• Place of effective management. Korea treats a foreign company whose place of effective management (실질적 관리장소) is in Korea as a Korean domestic corporation.
• Classification. Korea generally classifies a US LLC as a corporation, not a pass-through.
• Overseas investment reporting. Korea expects residents to report direct investment abroad through a foreign exchange bank.

This guide walks through US company formation from South Korea, and treats US LLC formation and US C-Corp formation separately, with won examples, so you can take the right questions to your tax accountant (세무사).

In short: a resident or citizen of South Korea can own 100% of a US LLC or C-Corporation, formed remotely with no visa or SSN. Korea generally treats a US LLC as a foreign corporation. A US company that is actually run from Korea can be a Korean domestic corporation for tax, under the place of effective management rule. Korea's CFC rules apply where the company bears tax of 15% or less, but not where its actual income is ₩200 million or less (passive income aside). Buying 10% or more of a foreign company is overseas direct investment, reported through your designated foreign exchange bank. US dividends to Korea are withheld at 15% for individuals and 10% for companies holding at least 10%. With UCB, a Wyoming LLC with EIN is $249 and a Delaware corporation with EIN is $358, all-in.

Who can set up a US company from Korea

Any adult can own a US company, whatever their nationality or country of residence. US states set no residence or citizenship requirement, and a sole owner can also be the only manager or director. You do not need a US visa, a US address or a Social Security number, and you do not need to visit. The company needs a registered agent in its state, which is included for the first year in every UCB formation (see registered agent explained).

Korean tax depends on residence, not citizenship. A resident (거주자) is someone with a domicile in Korea, or who has stayed 183 days or more in a tax year. Residents are taxed on worldwide income. A foreign national who has lived in Korea for five years or less out of the last ten is taxed on foreign income only to the extent it is paid in Korea or remitted there. A Korean citizen who has moved abroad for good and is no longer resident is taxed in Korea only on Korean-source income, so the rules of the new home country decide how a US company is taxed.

This guide concentrates on residents of Korea, because that is where the Korean rules apply.

How US company formation from Korea works

You choose a state and a name, and the state registers the company. The IRS then issues an Employer Identification Number (EIN), the company's tax number, which you need for the bank account, Stripe or Amazon. No SSN or ITIN is required (see EIN for non-residents). Formation and EIN are followed by the business bank application, which is done online.

Two practical points come up with Korean founders. The first is name order and romanisation. US banks match your name to your passport, so use the exact romanisation and order in your passport (for example HONG GILDONG, or Gildong Hong if you use the Western order consistently) on the company documents, the EIN application and the bank form. A hyphen in one document and none in another is enough to trigger a manual review.

The second is proof of address. An English-language resident registration certificate (영문 주민등록등본), which you can get online or at a community centre, is accepted by most providers, as is a recent utility bill or bank statement in your name. Foreign residents of Korea can use a residence card (외국인등록증) with their passport.

The Korean rules that matter

Before choosing between an LLC and a corporation, it helps to see the three Korean rules side by side, because they apply to both.

Place of effective management

Under the Corporate Tax Act, a corporation is a Korean domestic corporation if its head office, principal office or place of effective management is in Korea. A company formed in Wyoming or Delaware but whose strategic and day-to-day decisions are all taken by one person sitting in Seoul can be treated as a Korean corporation, taxed in Korea on its worldwide income at Korean corporate rates.

Japan, by contrast, decides corporate residence by place of incorporation, so this Korean rule surprises founders who have read Japanese or European advice. Whether it applies depends on facts: where decisions are made, where the people who make them live, where the books are kept and where meetings happen. A one-person US company run from Korea is the hard case. A US company with a US manager, US staff or a US board is the easy one.

Korean corporate tax rates rose by one percentage point for business years starting on or after 1 January 2026. The first band, up to ₩200 million of taxable income, is now 10% (11% with local income tax), then 20% up to ₩20 billion.

How Korea classifies a US LLC

Korean tax law classifies foreign entities by their own features. An entity that has legal personality under the law of the country where it was formed, or whose members all have limited liability, is a foreign corporation (외국법인). A US LLC has both features, so Korea generally treats it as a corporation, even when the IRS ignores a single-member LLC or taxes a multi-member LLC as a partnership.

The CFC rules (특정외국법인 유보소득 배당간주)

If a Korean resident holds at least 10% of a foreign company, counting holdings of related persons, and the company's actual tax burden is 15% or less of its actual income (averaged over the last three years), its retained profits can be deemed paid out as a dividend and taxed in Korea each year. There are two important exceptions. A company with a fixed place of business in its own country that actively runs its business there is generally outside the rules, unless it is mainly a passive-income company. And a company whose actual income for the year is ₩200 million or less is not caught, although passive income can still be included where it passes the passive income tests.

A 2026 tax reform proposal would change the threshold to below 15%, matching the global minimum tax. Check the current wording with your adviser.

Overseas direct investment reporting

Under the Foreign Exchange Transactions Act, a resident individual or Korean company that acquires 10% or more of a foreign company, or lends to it on certain terms, makes an overseas direct investment (해외직접투자). This is reported through a designated foreign exchange bank (지정거래외국환은행). Smaller investments can be reported after the fact. Larger ones must be reported before the money is sent. The thresholds have been relaxed several times, so confirm the current figures with your bank. Follow-up reports are also due: a remittance report, a securities acquisition report, an annual business report on the US company and a liquidation report if you close it.

Missing these can bring fines, and banks will not process the capital remittance without the report. Separately, residents who make an overseas direct investment file a statement on the overseas subsidiary (해외현지법인 명세서) with their tax return.

Korean residents must also file an overseas financial account report (해외금융계좌 신고) in June if the combined balance of their foreign accounts exceeded ₩500 million on the last day of any month of the previous year. Accounts held through a company you own can count, depending on the ownership. Non-reporting carries fines that grow with the unreported amount, and criminal penalties above ₩5 billion.

US LLC formation from Korea

The US side

A single-member LLC owned by a non-resident is disregarded for US federal income tax. If the work is done in Korea and the LLC has no US office, employees or dependent agents, its income is usually not connected with a US trade or business, and no federal income tax is due (see effectively connected income explained). Every year the LLC files Form 5472 with a pro forma Form 1120, and missing it carries a $25,000 penalty even when no tax was owed (see Form 5472 explained). Wyoming and New Mexico are the usual states for an LLC run from abroad.

The Korean side

Combine the three rules and a one-person LLC run from Seoul has three possible outcomes in Korea, depending on the facts:

• The LLC is a Korean domestic corporation because it is effectively managed in Korea. It files Korean corporate tax returns on its worldwide profits, and what you take out is salary or dividends from a Korean-resident company.
• The LLC is a foreign corporation not caught by the CFC rules, for example because its actual income is ₩200 million or less. Its profits are taxed in your hands only when paid to you as dividends.
• The LLC is a foreign corporation caught by the CFC rules. Its retained profits are deemed distributed to you each year.

Which outcome applies is a judgement for your 세무사. It is worth asking for it in writing before you form the company, because it decides your Korean filings.

A won example

These are illustrative figures, not a client case, at ₩1,400 to the dollar.

Jihoon is a freelance backend developer in Seoul. His US clients pay $100,000 a year, his costs are $10,000, and he keeps $90,000 profit, about ₩126 million.

If he invoices as a Korean sole proprietor (개인사업자), the ₩126 million is business income. Before deductions, national income tax at the 35% band is about ₩28.7 million (₩126 million × 35%, less the ₩15.44 million progressive deduction), plus 10% local income tax, about ₩31.5 million in all. His services to foreign clients, paid in foreign currency through a foreign exchange bank, are zero-rated for VAT (영세율).

If he forms a Wyoming LLC and his 세무사 concludes it is effectively managed in Korea, the LLC is taxed as a Korean corporation. Corporate tax on ₩126 million at 10%, plus local income tax, is about ₩13.9 million, but that is only the first layer. Any salary he pays himself is taxed as employment income, and any dividend as dividend income. He also now has Korean corporate bookkeeping and returns, the US Form 5472 filing, and overseas direct investment reports on top.

If the LLC were instead a foreign corporation managed outside Korea, the ₩200 million de minimis would keep it outside the CFC rules this year. But a solo founder living in Seoul has difficulty showing management outside Korea.

The lesson Jihoon took from his 세무사 was that the US LLC would not reduce his Korean tax in any reliable way. He formed it anyway, because two of his US clients only contract with US vendors and he wanted dollar payments through Stripe, but he budgeted for the extra filings. A Korean sole proprietor who just wants to be paid in dollars might reasonably decide against it.

US C-Corp formation from Korea

The US side

A C-Corporation pays 21% federal tax on its profits, plus state income tax where it has nexus, and files Form 1120 (with Form 5472 for transactions with a foreign owner) every year. Delaware is the usual state for companies that will raise from investors. See the C-Corp guide for non-residents and the 21% corporate tax explained.

Dividends paid to Korea carry US withholding tax at 30% unless a treaty rate is claimed. The US–Korea treaty, which dates from 1976, reduces it to 15% for an individual and 10% for a company owning at least 10% of the voting stock. Interest is withheld at up to 12%, and royalties at 10% or 15% depending on the type. Treaty rates are claimed on Form W-8BEN or W-8BEN-E (see W-8BEN-E vs W-8BEN).

The Korean side for an individual owner

A Korean resident receiving US dividends has foreign financial income. Dividends from abroad that were not withheld in Korea are generally taxed under comprehensive income taxation at your marginal rate, rather than at the 14% separate rate that applies to small domestic financial income. The 15% US withholding is credited against the Korean tax.

The place of effective management rule applies to a corporation exactly as it does to an LLC. A Delaware corporation run entirely by its founder from Seoul can be a Korean domestic corporation, which also raises treaty residence questions between the two countries. For a solo founder, a US corporation is therefore not a way around Korean corporate tax. It is the right structure when you need investors, a US board or US staff.

A Korean company with a US subsidiary

A Korean company (주식회사) expanding to the USA normally uses a US corporation as its subsidiary. Since 2023, Korea exempts 95% of dividends a Korean company receives from a foreign subsidiary it has held at least 10% of for six months (foreign dividend exclusion).

There is a trade-off. Korea gives no foreign tax credit for US withholding on an excluded dividend. The 10% US withholding under the treaty becomes a real cost, and many groups keep profits in the US subsidiary for growth rather than paying them up each year.

Take an illustrative case: a Pangyo game studio forms a Delaware corporation with a community and marketing team in Los Angeles. The subsidiary bills the parent for its services at a cost-plus fee, which must be documented under transfer pricing rules, pays US tax on that margin, and builds US publishing deals in its own name. The subsidiary has real US staff and management, so neither the place of effective management rule nor the CFC rules is a concern. See US subsidiary for a foreign company.

Startups raising from US investors

Korean startups that raise from US venture funds are often asked to "flip": a Delaware corporation becomes the parent, and the Korean company becomes its subsidiary. A flip involves a share swap, overseas direct investment reports, possible Korean tax on the founders' gains, and, for founders who later emigrate, Korea's exit tax on large shareholdings (국외전출세). It needs Korean and US lawyers. Forming the Delaware corporation is the simple step (see raising US investment as a foreign founder).

Selling to Korean customers through the US company

If the US company sells digital services to consumers in Korea, such as games, apps, online courses or subscriptions, it can need to register for Korean VAT under the simplified registration for foreign digital service providers (간편사업자 등록). Sales to Korean businesses are handled by the business under the reverse charge.

US sales tax is a separate state-by-state system with no input tax recovery, and it matters if you sell physical goods into the USA. See state taxes for a foreign-owned LLC.

Which state

Wyoming is the default for a freelancer, agency or online business run from Korea, and New Mexico is the cheapest alternative because it has no annual report. Delaware is for a corporation that will raise money. A real office or warehouse in California, New York, Texas or elsewhere means forming there or registering there as well. California, for example, charges a minimum $800 franchise tax each year. See best state for non-residents and the state selector.

What it costs

State fees and the first-year registered agent are included. Korean bookkeeping, tax returns and foreign exchange reports are handled by your 세무사 and bank, and are separate. See what a US LLC costs every year.

Banking and moving money

Korea is a low-risk jurisdiction for US banks and fintechs, and residents of Korea are generally accepted for remote business accounts. Applications are usually rejected for the same avoidable reasons:

• A vague business description.
• A website only in Korean, or no website.
• Name romanisation that differs between documents.
• The registered agent's address given as the business address.

Prepare an English website that says plainly what you sell and to whom.

On the Korean side, sending the company's initial capital from your Korean account requires the overseas direct investment report first, so start that with your bank while the company is being formed. When money comes back to Korea as salary, dividends or service fees, the receiving bank will ask what it is for, and for a sole proprietor the zero-rating of export services depends on payment through a foreign exchange bank. Keep invoices and contracts organised. See US business bank accounts for non-residents, why banks reject non-resident applications and Stripe for non-residents.

If you later move to the USA

Korea is an E-1 and E-2 treaty country. A Korean citizen who makes a substantial investment in a real US business can apply for an E-2 investor visa through that company, with an immigration lawyer. Once you live in the USA, the US company's profits become your US taxable income. If you hold a large shareholding when you emigrate, Korea's exit tax can apply to unrealised gains. If a move is planned, design the structure with both in mind.

Common mistakes

• Running a US company entirely from Seoul without considering the place of effective management rule, which can make it a Korean corporation.
• Assuming the LLC is a pass-through in Korea. Korea generally treats it as a corporation.
• Sending capital before the overseas direct investment report, or forgetting the annual business report afterwards.
• Forgetting the overseas financial account report once balances pass ₩500 million at any month-end.
• Skipping Form 5472 because no US tax was due.
• Inconsistent romanisation of your name or the company's name across the state filing, EIN letter and bank application.

Frequently asked questions

Can a Korean citizen own 100% of a US company? Yes, living in Korea or abroad, with no US visa, SSN or visit needed.

Is my US LLC a Korean corporation? It is generally a foreign corporation for Korean tax. If it is effectively managed from Korea, it can be treated as a Korean domestic corporation. Ask your 세무사 to look at how it will actually be run.

Does the ₩200 million rule mean small companies are never caught by the CFC rules? A company whose actual income for the year is ₩200 million or less is outside the CFC deemed dividend rules. Passive income can still be included, and the place of effective management rule is separate.

Do I need to report the US company to my Korean bank? Yes, if you hold 10% or more. That is overseas direct investment under the Foreign Exchange Transactions Act, reported through your designated foreign exchange bank, with follow-up reports afterwards.

How much US tax is withheld on dividends to Korea? 15% for an individual and 10% for a company owning at least 10% of the voting stock, with Form W-8BEN or W-8BEN-E.

Will my US LLC pay US tax if I work from Korea? Usually not, without a US office, staff or agent. It still files Form 5472 and a pro forma 1120 every year.

Do I need an ITIN? Not to form the company or obtain its EIN. See what is an ITIN and who needs one.

How UCB can help

We handle US company formation from South Korea remotely: the state filing, EIN, registered agent, US business address and bank application, and then the yearly federal return through our US tax filing service. Your 세무사 and your foreign exchange bank handle the Korean side, and we supply the US documents they ask for. If your plan looks likely to run into the place of effective management or CFC rules, we will tell you before you form. See our formation, EIN and bank account package ($348) and the country guide.

Setting up a US company from Korea? WhatsApp us at +1 315 961 2956 or email enquiries@ucbsolutions.com.