Train at a Korean industrial company when your employer has a direct investment or technology-export tie with Korea.
Written by James Chae — Co-Founder, Expert Sapiens
Platform expertise: Immigration consulting & visa services · Reviewed July 2026
Reviewed against
James Chae, 행정사 (Korean Licensed Administrative Attorney). License No. 220-06-06463 · 대한행정사회 (Korean Administrative Agents Association). Reviewed against the HiKorea 사증·체류업무 자격별 안내 매뉴얼 and cross-checked with Ministry of Justice issuances.
Last reviewed
July 14, 2026
Source references
Filing caution
Requirements can change by nationality, local immigration office, and filing channel. Confirm exact requirements with HiKorea, the responsible Korean consulate, or a licensed immigration specialist before filing.
Stay Duration
Duration of training (typically 6 months to 1 year); extendable up to 2 years maximum
Processing
4–8 weeks (사증발급인정서 required)
Visa Fee
$44.78 (extension)
Fees and processing times sourced from HiKorea & Ministry of Justice. Figures are updated periodically but may change — verify before submitting.
Readiness check
Use this quick self-check before you spend time on forms or book a consultation for Technical Trainee Visa.
Next focus
Eligibility fit
I meet the core D-3 requirements and understand any sponsor, degree, income, family, or experience conditions that apply.
The D-3 visa (기술연수 — technical training) is for foreign workers who come to Korea to receive on-the-job technical training at a Korean industrial company. It is strictly tied to an existing business relationship: the trainee must be an employee of an overseas subsidiary or joint venture of the Korean company, or work for a foreign firm that has licensed Korean technology or imported Korean-made industrial plant worth the statutory minimum threshold. The D-3 is not a general skills-training visa — it is a company-to-company knowledge-transfer instrument. All D-3 visas must be sponsored through a 사증발급인정서.
Production-line workers employed by a company that is an overseas subsidiary or joint venture of a Korean industrial firm, or a foreign firm that has imported Korean technology (USD $100,000+ technology license) or industrial plant (USD $500,000+). Must be personally unable to acquire the required technical skills in their home country.
Employed by the overseas subsidiary/joint-venture or partner firm that qualifies the host Korean company for the D-3 programme
Korean host company has a qualifying relationship: overseas direct investment under 외국환거래법, technology export contract of USD $100,000+, or plant export of USD $500,000+ under 대외무역법
Training is necessary because the technology cannot be taught outside Korea
Host Korean company must be a registered industrial establishment (기술연수업체)
Trainee is a production-level worker, not a manager or admin
Korean-language ability documentation may be required
Delay and refusal risks
Business-investor cases are document-heavy because immigration reviews both the legal investment route and the real business activity.
D-8 review can stall when the investment amount, sender, receiving company, bank trail, foreign-exchange documents, or investor identity do not line up cleanly.
Manual basis: The D-8 manual references investment funds, remittance/payment evidence, foreign-investment registration, and related supporting documents.
Company registration alone is not enough. Thin operating records, no real business activity, or weak continuity evidence can invite additional review.
Manual basis: The stay manual includes D-8 extension and business-continuity review points for investor status management.
Some industries or business structures are restricted or do not fit the claimed D-8 route. A filing built around the wrong route can be refused or redirected.
Manual basis: The D-8 sections refer to restricted industries and cases where the applicant is not considered essential management or production-technology personnel.
If relying on a technology startup pathway, OASIS, IP, corporate setup, and founder activity evidence must support the specific route claimed.
Manual basis: The manual separates investor and technology-startup founder pathways and lists different documentary expectations.
Source note
These are practical risk factors for Technical Trainee Visa, not a complete list of legal refusal grounds. Final review can vary by nationality, filing channel, consulate, immigration office, and case facts.
Valid passport + visa application form + passport photo
사증발급인정서 (Certificate of Visa Issuance) — mandatory for all D-3 applications
Home company's registration certificate or establishment certificate
Letter of employment from home company confirming the trainee's production-staff role
Proof of qualifying business relationship (overseas investment registration, technology-export contract, or plant-export documents)
Korean-language proficiency documents (if required)
Korean company confirms D-3 eligibility
The Korean host company (기술연수업체) verifies that it has a qualifying investment, technology-export, or plant-export relationship with the overseas firm employing you.
Korean company applies for 사증발급인정서
The host company applies to the regional immigration office for a 사증발급인정서. The application must include proof of the qualifying business relationship and of your employment at the overseas partner firm.
Apply at the Korean consulate
Submit your D-3 visa application at the Korean embassy or consulate with the 사증발급인정서 and supporting documents.
Undergo training and register
On arrival, register at the local immigration office within 90 days. You may only perform the training activities as specified in the invitation — no separate employment.
Need help with your D-3 visa?
Connect with a verified specialist who handles D-3 applications.
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HiKorea
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Status of Sojourn Change (체류자격 변경)
A status of sojourn change allows a foreigner already in South Korea to switch from one visa category to another without leaving the country — for example, from a D-2 student visa to an E-7 skilled worker visa upon graduation and employment.
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Specific tracks under the D-3 category. Pick the one that matches your situation for track-level documents, criteria, and filing notes.
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