South Korea is an easy market to start sourcing from and a surprisingly easy one to get wrong on paper: a buyer checks a company against the wrong register, assumes KC certification is a formality rather than a safety requirement, or claims the wrong one of three overlapping trade agreements between Korea and Vietnam and ends up with a rejected preferential duty claim at the border. Each of those has a specific, checkable answer.
💬 Sourcing from a Korean supplier and want the registration checked, the certification requirement confirmed and the right trade agreement claimed at the border? Talk to us about sourcing from across Asia. How we work there: our sourcing agent service for South Korea.
Finding Korean suppliers through the state trade promotion agency
KOTRA (Korea Trade-Investment Promotion Agency) operates buyKOREA, a business-to-business platform listing Korean exporters by product category, and is the natural starting shortlist before any direct outreach.
buyKOREA lets a buyer search Korean sellers by product and send an enquiry directly through the platform, which functions as a first filter in the same way TAITRA’s Taiwantrade or MATRADE’s directory does for Taiwan and Malaysia — see finding factories in ASEAN and Taiwan for the general principle of using a state trade agency directory as a starting list rather than a guarantee. Being listed confirms the company registered with KOTRA as an exporter; it does not confirm manufacturing capability, and it does not confirm the listed company is the actual factory rather than a trading agent.
Checked against KOTRA’s own published platform description on 25 September 2026.
Checking a Korean company: two different registrations, two different offices
A Korean company carries two separate registration numbers issued by two separate authorities, and a buyer who only checks one has confirmed only half of what needs confirming.
The Corporation Registration Number (CRN) is issued when a company registers its incorporation with the court system, and is the number that establishes the company’s legal existence; a certified extract can be obtained through the court registry system (Iros), showing registered name, address, business purpose, capital and directors. The Business Registration Number (BRN) is a separate, ten-digit number issued by the National Tax Service (NTS) when the company registers for tax purposes, and its certificate can be checked for authenticity on the NTS’s own Hometax service.
| Registration | Issued by | What it confirms |
|---|---|---|
| Corporation Registration Number (CRN) | The court registry (via Iros) | Legal incorporation, registered address, directors, capital |
| Business Registration Number (BRN) | National Tax Service (NTS), via Hometax | The company is registered for tax purposes and the certificate is genuine |
Ask a new Korean counterparty for both numbers, not one, and check each against its own issuing system — a genuine BRN does not by itself confirm the underlying company is validly incorporated, and vice versa.
Checked against the National Tax Service’s and the court registry (Iros) system’s own published guidance on 25 September 2026.
💬 Found a Korean supplier and want both registration numbers checked before you commit to a first order? Send us the company details.
When KC certification applies
KC (Korea Certification) is Korea’s unified mandatory safety mark, administered by the Korean Agency for Technology and Standards (KATS) under the Ministry of Trade, Industry and Resources (renamed from the Ministry of Trade, Industry and Energy on 1 October 2025), and a product on its scope cannot be imported into Korea without it — the relevant question for a buyer sourcing out of Korea for a third market is whether the factory built to a Korean-market-specific standard that your own destination market does not require, or recognise as equivalent.
KC unified what were previously thirteen separate mandatory certification marks. Testing and certification against KC is carried out by accredited bodies such as the Korea Testing Laboratory (KTL), the Korea Testing and Research Institute (KTR) and Korea Testing Certification (KTC), which test products and issue the certification permitting the KC mark.
| Question to the factory | Why it matters |
|---|---|
| Is this product built to a KC-certified specification, or to your own export specification? | KC certification proves compliance with a Korean domestic requirement, not your destination market’s standard |
| Which accredited body (KTL, KTR, KTC, or another) issued the test report? | Confirms the certification came from a body actually accredited for KC testing |
| Does your destination market recognise Korean test reports, or require its own separate certification? | Most markets, including Vietnam, run their own separate certification regime regardless of what Korea requires domestically |
Checked against KATS’s own published scope and the Korean Agency for Technology and Standards’ role under Korea’s Ministry of Trade, Industry and Resources, 25 September 2026 (ministry name updated 17 October 2026).
Export documents: which certificate of origin, and who issues it
Korea and Vietnam are covered by three overlapping trade instruments — the bilateral VKFTA, the regional AKFTA (ASEAN–Korea), and RCEP — each with its own certificate-of-origin form, and choosing the wrong one for the rules of origin your goods actually meet is a common reason a preferential claim is rejected.
Certificates under these agreements are issued in Korea either by the Korea Customs Service or by an accredited chamber of commerce — the Korea Chamber of Commerce and Industry (KCCI) operates a Trade Certification Service Center that handles origin certification for exporters registered with it. Form AK applies under AKFTA, Form VK (also referred to as KV) applies under VKFTA, and RCEP has its own certification procedure; VKFTA does not replace AKFTA or RCEP, and an exporter can generally choose whichever agreement’s rules of origin the goods satisfy and whichever offers the better rate for the specific product.
| Agreement | Certificate of origin form | Issued by |
|---|---|---|
| VKFTA (Vietnam–Korea) | Form VK / KV | Korea Customs Service or an accredited chamber of commerce (confirm which applies to your product before relying on it) |
| AKFTA (ASEAN–Korea) | Form AK | Korea Customs Service or an accredited chamber of commerce |
| RCEP | RCEP certificate of origin | Korea Customs Service or an accredited chamber of commerce, under RCEP’s own procedure |
Ask the supplier which agreement it intends to certify under before the order is placed, and confirm this matches the rules of origin the goods actually meet — a mismatched form is refused at the Vietnamese border, not corrected there.
Checked against Korea Customs Service’s own published issuing-authority guidance and Vietnam’s National Trade Repository FTA pages, 25 September 2026.
Ports and the shipping route into Vietnam
Busan, on Korea’s southeast coast, is the country’s principal container port and transshipment hub; Incheon, serving the Seoul metropolitan area, is the other major container port and the more likely departure point for a factory located in or near Seoul.
Which port a shipment departs from depends on the factory’s location, not a fixed national rule — a factory near Seoul shipping through Busan rather than the closer Incheon adds an inland haulage leg that should appear as its own line on the freight quotation, in the same way it does for any other origin country.
Putting the process together
Work through these in order before placing the first order.
- Shortlist through buyKOREA (KOTRA’s platform), treating a listing as a starting point, not a guarantee.
- Check both the CRN (court registry, via Iros) and the BRN (National Tax Service, via Hometax) before relying on the company’s own claims.
- Confirm whether the product needs KC certification for the Korean domestic market, and separately confirm your own destination market’s certification requirement.
- Decide which of VKFTA, AKFTA or RCEP the goods qualify under, and ask the supplier for the matching certificate of origin form.
- Confirm which port the factory ships from, and price any inland haulage to a more distant port separately.
For comparing what a Korean quotation actually costs landed in Vietnam against a quotation from another Asian country, see comparing Asian suppliers on landed cost.
💬 Ready to source from Korea with the registration, certification and origin documents confirmed upfront? Contact us about sourcing from Asia. See how we source from across Asia.
Frequently asked questions
1. Is a company listed on buyKOREA guaranteed to be a real, currently operating factory?
No. It confirms the company registered with KOTRA as an exporter. Confirm its legal registration separately through the CRN and BRN checks, and confirm it is the manufacturer rather than a trading agent.
2. What is the difference between a Korean company’s CRN and BRN?
The Corporation Registration Number (CRN) is issued by the court registry and establishes legal incorporation. The Business Registration Number (BRN) is issued separately by the National Tax Service for tax purposes. Both are worth checking; neither substitutes for the other.
3. Does every product from Korea need KC certification?
Only products within KC’s mandatory scope, administered by KATS. KC certification confirms compliance with a Korean domestic requirement — it does not by itself confirm compliance with your own destination market’s separate standard.
4. Which trade agreement should I use for a shipment from Korea to Vietnam — VKFTA, AKFTA or RCEP?
Whichever the goods actually meet the rules of origin for, and whichever gives the better rate for the specific product — the three agreements run in parallel and none automatically replaces the others. Confirm the choice with the supplier before the certificate of origin is issued.
5. Which Korean port should I expect a shipment to move through?
Most commonly Busan, though a factory near Seoul may ship through the closer Incheon instead — ask the factory directly rather than assuming.
Sources: KOTRA, buyKOREA platform description; National Tax Service (NTS), Hometax certificate-authenticity guidance; court registry system (Iros), company registration record guidance; Korean Agency for Technology and Standards (KATS), KC certification scope; Korea Customs Service, issuing-authority guidance for certificates of origin; Korea Chamber of Commerce and Industry (KCCI), Trade Certification Service Center; Vietnam National Trade Repository, VKFTA and AKFTA pages. Checked on 25 September 2026.