Technical Instruction (Technology Transfer)

Who can apply

• ✓Foreign nationals invited by a public or private organization in Korea to PROVIDE (transfer/instruct) either specialized knowledge in the natural sciences or technology belonging to a special industrial field.
• ✓The exact legal definition in the Enforcement Decree of the Immigration Act (출입국관리법 시행령 별표1, item 22) is ‘a person invited by a public/private institution in Korea to provide specialized natural-science knowledge or special-field industrial technology’ (자연과학분야의 전문지식 또는 산업상의 특수한 분야에 속하는 기술을 제공하기 위하여 대한민국내의 공·사기관으로부터 초청되어 종사하고자 하는 자).
• ✓In practice this covers foreign technical experts/engineers sent by an overseas company to a Korean organization to instruct or transfer a specific technology (for example under a technology-transfer/technology-introduction or dispatch contract).
• ✓The key distinction from E-3 (Research): E-4 is about PROVIDING/transferring existing specialized technology to a Korean organization, whereas E-3 is about carrying out research and development.
• ✓Low relevance to students.

Documents you'll need

• General documents for the Certificate of Visa Issuance (사증발급인정서) route: integrated application form (통합신청서) with one color photo (3.5cm x 4.5cm)
• passport and copy
• the inviting Korean organization’s business registration certificate (사업자등록증) or corporation registration
• and documents proving the technical-instruction relationship – typically the technology-transfer / technology-introduction contract or dispatch/instruction contract between the sending company and the Korean organization, plus a dispatch order or certificate of employment from the sending company showing the applicant’s technical qualifications/career. The exact E-4 attachment list on the current HiKorea/immigration manual could not be fully loaded during this research (HiKorea detail page returned a server error) and should be confirmed on HiKorea for the specific case. (E-4-specific supporting documents above are described from the standard practice for this category and should be treated as indicative, not an exhaustive official list.) (unverified exact list)

How to apply

• Overseas embassy visa (사증) or domestic change-of-status; E-4 commonly uses a Certificate of Visa Issuance (사증발급인정서) filed in Korea by the inviting Korean company/organization.
• E-4 is one of the categories eligible for the Certificate of Visa Issuance / Confirmation route (사증발급인정서) – confirmed on HiKorea, where E-4 is listed together with E-1, E-2, E-3, E-5, E-6, E-7, E-9 and E-10.
• Typical flow: the inviting Korean public/private organization applies to its local immigration office for the Certificate of Visa Issuance on behalf of the foreign technician; once issued, the applicant applies for the actual E-4 visa at a Korean embassy/consulate abroad.
• Someone already in Korea on another eligible status may instead apply for a change of status of stay at an immigration office (booked via HiKorea).
• Short technical assignments under 90 days generally use the short-term employment visa (C-4) rather than E-4.

Working on this visa

Yes – E-4 is a work visa. The holder may carry out the approved technical-instruction / technology-transfer activity at the inviting organization stated in the status.

Work outside that scope, or moving to a different inviting organization, requires prior immigration permission (체류자격외 활동허가 or a change/report) – working beyond the permitted activity is not allowed.

Sub-types

E-4 (기술지도) is a single category for technical instruction / technology transfer. It is legally distinct from E-3 (연구, Research): E-4 = providing/transferring specialized technology to a Korean organization; E-3 = performing research and R&D.

The public immigration manuals do not publish distinct E-4 sub-codes (e.g. E-4-1/E-4-2) in the way E-7 is subdivided, so no sub-classification is stated here.

(No official E-4 sub-codes documented – unverified.)

2025–2026 policy updates

• No E-4-specific 2025-2026 rule change was confirmed from official sources during this research.
• E-4 is not individually named in the major 2025-2026 skilled/science-talent visa reforms (which centre on E-7-4 skilled-worker points, E-3 research experience relaxation, and the Top-Tier F-2 fast-track for advanced-industry, science and technology personnel).
• A Ministry of Justice research paper (논단) on preventing technology outflow through the visa system discusses E-3 and E-7 as high-tech-access categories but does not report an implemented E-4 change.
• Re-verify against the current immigration manual before relying on this.
• (Any E-4 changes: unverified / none confirmed.)

Common mistakes

• Confusing E-4 (providing/transferring technology) with E-3 (Research/R&D) or with E-7 (specified activities/employment) – the correct category depends on whether the person is transferring existing specialized technology, doing research, or in a contracted specialty job.
• Using E-4 for a short assignment under 90 days, which normally requires the C-4 short-term employment visa instead.
• Starting the technical-instruction work before the visa or change of status is actually approved.
• Assuming any technician qualifies – the activity must be specialized natural-science knowledge or special-field industrial technology provided under an invitation from a Korean public/private organization.

Where this leads

Official source ↗  Official manual ↗