C-3-4 Business Visa: What You Can Do in Korea and What You…

Your Seoul meetings are booked. Your visa isn’t.

Maybe your Korean partner said, ‘Just get a business visa.’ Then you opened the embassy page and found codes like C-3-4, C-3-5, and C-4. Which one fits a three-day trip of meetings and a factory visit? And what does your partner need to send you?

For most unpaid business trips, the answer is the C-3-4 visa, Korea’s general short-term business status. Or no visa at all, if your passport qualifies for visa-free entry. This guide follows the rules published by the Korea Immigration Service and the Korea Visa Portal, in the order you’ll actually need them.

Why ‘business’ doesn’t mean ‘work’ on a C-3-4 visa

A C-3-4 visa covers short-term business activities that don’t earn you income in Korea. You can attend meetings, negotiate and sign contracts, do market research, visit trade fairs, and inspect a partner’s facilities. You can’t take a salary, fee, or paid job from a Korean source. Paid work, even for a few days, needs a different status, such as C-4.

The C-3 family covers short visits to Korea. Its business branch is called dangi sangyong (단기상용, short-term business). The Ministry of Justice splits it into a few subtypes:

• C-3-4 (general business): the standard route for most business travelers
• C-3-5 (business under agreements): for nationals covered by specific bilateral agreements
• C-3-6 (preferred-company invitation): for guests invited by companies the Ministry of Justice has designated

This guide focuses on C-3-4. It’s the one most people end up with.

Short-term business visa allowed activities

These activities generally fit a C-3-4 stay:

• Business meetings and negotiations
• Signing contracts
• Market research and site visits
• Attending trade fairs, exhibitions, and conferences
• Inspecting goods, facilities, or a partner’s production line
• Meetings at your own company’s Korean branch

What crosses the line

Here’s the catch. The test isn’t what the activity looks like. It’s whether you’re paid for it in Korea.

Korea’s Immigration Act draws that line in Article 18:

A foreigner who intends to work in the Republic of Korea must obtain a status of sojourn that permits employment, as prescribed by Presidential Decree. (Immigration Act, Article 18(1), summarized from the MOLEG English translation)

So these activities need a different status, usually C-4 (short-term employment) or a full work visa:

• Receiving a fee, honorarium, or salary from a Korean company
• Giving paid lectures or performances
• Doing hands-on work a Korean employee would normally be paid to do

Your regular salary from your home employer is a different matter. That’s normal for a business trip. The risk starts when a Korean entity pays you for the activity itself.

So you know what’s allowed. The next question surprises a lot of travelers: do you even need this visa?

Business trip visa vs K-ETA: do you even need a visa?

If your country has a visa waiver agreement with Korea or sits on the visa-free list, you usually enter without a visa after getting a K-ETA online. On that visa-free entry, you can still attend meetings and sign contracts. If your country isn’t visa-free, or your K-ETA is refused, you apply for a C-3-4 visa at a Korean embassy or consulate.

Korea offers visa-free entry to nationals of many countries, through waiver agreements or reciprocity. Before boarding, most of these travelers need a K-ETA (Korea Electronic Travel Authorization).

Key K-ETA facts from the official K-ETA portal:

• Fee: 10,000 won per application
• Apply at least 72 hours before boarding
• Validity: up to 3 years, but never past your passport’s expiry
• Some nationalities have been temporarily exempted; the portal lists which ones and until when

Here’s how the two routes compare:

But visa-free doesn’t mean guaranteed. A K-ETA application can be refused. If that happens, you apply for a regular visa such as C-3-4 at a Korean mission. And the no-paid-work rule follows you on both routes.

So which applies to you? If your passport is visa-free and your K-ETA is approved or exempted, you generally don’t need C-3-4. If not, keep reading. One document now carries most of your application.

The C-3-4 invitation letter: the page that carries your file

The C-3-4 invitation letter comes from the Korean company you’re visiting. It names you, your employer, the purpose and dates of the trip, and who covers your costs. An authorized person at the inviting company signs it, and it’s usually sent with that company’s business registration certificate. Consulate officers read it to judge whether your trip is genuine business.

In Korean, the letter is a chocheongseo (초청서). The company’s business registration certificate is a saeopja deungnokjeung (사업자등록증). Your partner’s office team will know both terms.

What a strong invitation letter includes

1. The inviting company’s name, address, phone number, and business registration number
2. Your full name exactly as in your passport, plus nationality, date of birth, and passport number
3. Your employer and job title
4. A specific purpose, such as ‘negotiation of a supply contract for Q1 deliveries’
5. Exact dates and the places you’ll visit
6. Who pays for travel and accommodation
7. Signature and company seal (dojang, 도장) of an authorized person

Words that weaken a letter

Vague phrases like ‘for business purposes’ tell the officer nothing. Wording like ‘work at our site’ or ‘join our team’ reads like employment. And if the letter says the Korean company will pay you a fee, that points toward C-4, not C-3-4.

There’s no single national template. Some missions publish their own format, and some also ask for a letter of guarantee (sinwon bojeungseo, 신원보증서) from the inviter. Check your mission’s page before your partner drafts anything.

The letter is one page in a bigger pile. Here’s the rest.

C-3-4 required documents: what goes in the envelope

Expect to submit a visa application form, your passport, one passport photo, the invitation letter, the inviting company’s business registration certificate, proof of your employment, and the fee. Many missions also want a business trip order from your employer and proof of past dealings. Each Korean mission sets its final list, so check the one covering your residence.

On cost: many Korean missions list USD 40 for a single-entry visa for stays of 90 days or less. Reciprocity rules change the amount for some nationalities, so confirm it with your mission.

Where you apply matters. You file at the mission covering the place you legally live. Applying outside your home country? Expect to show proof of legal residence there, such as a residence card.

Documents in other languages usually need an English or Korean translation. After you submit, you can track your application on the Korea Visa Portal.

Approval feels like the finish line. It isn’t quite. The stay limit has rules of its own.

C-3-4 maximum stay days: why 90 really means 90

A C-3-4 visa lets you stay up to 90 days per entry. That’s a ceiling, and the permitted stay recorded at entry is the number that counts. Short-term visas generally can’t be extended inside Korea, except for unavoidable reasons like illness or cancelled flights. Switching to a work or residence visa from inside Korea is also restricted.

Here’s what actually happens. When you land, immigration records your permitted period of stay. For C-3-4, that’s up to 90 days. That date, not your hotel booking, sets your departure deadline.

Don’t confuse two different dates:

• Visa validity: the window in which you must enter Korea
• Period of stay: how long you can remain after each entry

Multiple-entry C-3 visas exist for frequent business travelers. Each stay still has its own cap. A long visa validity doesn’t stretch a single stay.

Can you extend?

Rarely. HiKorea treats short-term stays as non-extendable except for unavoidable reasons, such as illness, an accident, or flight cancellations. If that happens to you, apply before your stay expires. You can file through HiKorea’s e-application or at an immigration office, with proof like hospital records.

Overstaying, even by a few days, can bring fines under the Immigration Act. It can also hurt future visa applications. Don’t risk it.

Can you switch status in Korea?

Generally no. Korea restricts changes from short-term visas to longer statuses, with narrow exceptions. C-3 visa status change Korea

Now you know the rules. Here’s the order to do everything in.

How to apply step by step, and the mistake to avoid at the airport

First confirm whether your passport is visa-free. If it is, get a K-ETA and stop there. If not, ask your Korean partner for the invitation letter and business registration certificate, collect employment proof from your employer, and submit everything with the fee at your Korean mission. Once approved, carry copies of the invitation letter when you fly.

The full sequence

1. Check your nationality’s entry rules on the Korea Visa Portal.
2. If you’re visa-free, apply for a K-ETA at least 72 hours before boarding, or confirm your exemption. You’re done.
3. If you’re not visa-free, send your Korean partner the 7-point invitation letter list above.
4. Ask your employer for a certificate of employment and a business trip order.
5. Find the Korean embassy or consulate covering your residence. Book an appointment if it requires one.
6. Submit your file and pay the fee.
7. Track the result on the Korea Visa Portal.
8. Pack copies of the invitation letter, your return ticket, and your hotel booking.

The mistake to avoid

At the airport, an officer may ask why you’re visiting. Your answer should match your invitation letter. Say ‘contract meetings with our supplier,’ not ‘I’m here to work.’ One loose word can trigger extra questions.

What if the trip goes well and leads to a job offer? That’s a separate process, usually a work visa applied for from outside Korea.

Your next move

Check your entry route on the Korea Visa Portal today. If you need a visa, send your partner the invitation letter checklist this week, since their paperwork often takes longest. Questions mid-trip? Call the 1345 Immigration Contact Center: dial 1345 inside Korea or +82-1345 from abroad. English service is available.