PhD in South Korea for International Students: When to Apply, Contacting Advisors, Tuition Waivers and Stipends, BK21, GKS and the D-2-4 Visa

Before submitting an application for a PhD in South Korea, there are decisions to make first: when to enroll, whose lab to join, and how to pay for roughly four years of tuition and living costs. In science and engineering in particular, an advisor's and a lab's research funding is often tied to a student's living expenses.

This article lays out what doctoral (D-2-4) applicants need to know, in this order: timing, contacting an advisor, tuition and stipends, scholarships and visas. Amounts are given in US dollars first, with Korean won in parentheses (Hana Bank base exchange rate on November 3, 2026, $1 = KRW 1,341.10).

When to apply: Spring 2027 is mostly closed, fall 2027 is next

Korean graduate schools admit students in March (spring) and September (fall). Application periods for international admissions vary by school, but applications are generally accepted five to eight months before enrollment. Most rounds for the spring 2027 semester closed in fall 2026.

POSTECH accepted second-round general admission applications for the spring 2027 semester from July 6 to September 11, 2026.

Applicants starting preparations now can aim for the fall 2027 round. KAIST will accept international graduate applications for the fall 2027 semester from January 7 to February 5, 2027. POSTECH's first round runs every year from late February to early April. The Global Korea Scholarship (GKS) graduate program is usually announced in February, with applications taken in February and March. Because KAIST's fall deadline falls in early February, it is advisable to have English test scores, a master's degree certificate or expected graduation certificate (apostilled if the school requires it), recommendation letters and a research proposal ready by the end of December. For apostille and translation of degree documents, school-by-school examples are available in our guide to documents for applying to a Korean master's program with an Indian bachelor's degree.

Application fees vary by school. For the spring 2027 round, they are as follows.

• KAIST: $80 (non-refundable). Applicants from least developed countries who meet academic criteria can apply for a waiver.
• UNIST: About $37 (KRW 50,000) for international applicants. There are no waivers and no refunds.
• Korea University (per school calendar): About $95 (KRW 127,000: KRW 120,000 application fee + KRW 7,000 processing fee).

Should you contact an advisor in advance?

It depends on the school. Some strongly recommend it, while others state that it is not necessary.

• KAIST: Strongly recommends that integrated master's-PhD and doctoral applicants contact prospective advisors in advance and list their names on the application. It is not a mandatory requirement.
• POSTECH: Has posted a list of faculty members taking students for the spring 2027 semester. The list is meant to help applicants choose prospective advisors.
• UNIST: Under its admission guidelines, prior approval from an advisor is not required.

Even where it is not mandatory, a PhD student can join a lab only if it has an opening. When emailing a professor, briefly cover these three points:

• Which of the professor's recent papers you have read
• How your master's research connects to the lab's topics
• The semester you plan to apply for

If the lab's website has a notice on recruiting students, follow its instructions.

Language requirements also differ by school. KAIST uses English as the official language of communication and instruction for international students and does not include TOPIK in its admission requirements. Its minimum English scores are IELTS Academic 6.5, TOEIC 720 and TEPS 326. For TOEFL iBT, the minimum is 83 for tests taken before January 21, 2026; the revised test after that date follows a separate standard set out in the guidelines. Institutional tests (ITP) are not accepted. Starting with the fall 2027 round, KAIST will accept English score waiver requests from applicants who completed their degrees in English in designated countries such as India, Pakistan and Sri Lanka (by submitting a Certificate of English Medium of Instruction). Bangladesh and Nepal are not on this list. UNIST does not accept institution-administered tests such as Duolingo.

How to pay for PhD tuition and living costs

At Korean science and engineering graduate schools, a common structure is for scholarships to cover tuition while students receive a monthly stipend in return for lab work (as a research assistant, RA, or teaching assistant, TA). Published examples are as follows.

KAIST. The KAIST Scholarship covers full tuition for eight semesters in the doctoral program and 10 semesters in the integrated master's-PhD program, and guarantees a monthly stipend. Tuition for general departments in 2026 is about $7,128 (KRW 9,559,000) per semester. KAIST has not disclosed the amount of the monthly stipend, which varies by department, program, advisor and research participation. Scholarship decisions are made separately from admission decisions.

POSTECH. The 2026 regular TA/RA scholarship for doctoral students is about $1,640 (KRW 2,200,000) a month. That is the sum of a tuition portion of about $659 (KRW 884,000) and a living allowance of about $981 (KRW 1,316,000). For master's students it is about $1,379 (KRW 1,850,000) a month. Because it has not been disclosed whether the tuition portion is paid in cash or offset against tuition, it is safer to plan living costs on the basis of about $981 a month. Actual amounts may vary by lab, and an advisor may pay more.

UNIST. The school's "government scholarship" and the UNIST scholarship cover full tuition of about $2,863 (KRW 3,840,000) per semester. The minimum research stipend under the government scholarship in engineering and natural sciences is about $820 (KRW 1,100,000) a month for doctoral students. Students must meet the applicable conditions, and actual support may vary by lab. The "government scholarship" here is the name of a UNIST scholarship category; it is a different program from the GKS described below.

At general universities that are not science and technology specialized universities, the level of support varies widely depending on a lab's research funding. Before applying, the practical step is to ask prospective advisors how tuition support and monthly stipends work. The term "fully funded" means different things at different schools and labs. For the assistantship scholarship structure in master's programs, see the Pusan National University example in our guide to Korean master's tuition and assistantship scholarships.

BK21 research scholarships: Phase 4 minimum of about $1,193 a month for PhD students

Brain Korea 21 (BK21) is a Ministry of Education program that supports graduate education and research groups. The current Phase 4 runs from September 2020 to August 2027. A February 2023 revision of the program's management and operation guidelines raised the monthly minimum research scholarships for participating graduate students.

These amounts apply only to students selected as participating graduate students of a BK21 education and research group, and only within a set period after enrollment (four years for doctoral students, six years for integrated master's-PhD students and two years for master's students). It is not money every doctoral student receives.

Some education and research groups accept international students as participating graduate students. The BK21 education and research group at Seoul National University's Graduate School of International Studies defines eligibility for foreign nationals as D-2 holders with a valid alien registration card. The BK21 education and research group in Ajou University's Department of Energy Systems pays international students' monthly scholarships in the same way as those of Korean students. Participation is decided by the education and research group and the advisor, so check whether the department you are applying to has a BK21 education and research group. Phase 4 ends in August 2027, and the criteria after that have not yet been officially announced.

GKS graduate scholarship: One year of Korean plus three years of degree study for PhDs

The Global Korea Scholarship for Graduate Degrees (GKS-G) is run by the National Institute for International Education (NIIED). For 2026, it released its guidelines on February 2, planning to invite 2,000 scholars in total: 800 through the Embassy Track and 1,200 through the University Track. Online applications for the Embassy Track ran from February 12 to 25. The number selected per country under the Embassy Track varies by country, and University Track deadlines vary by university.

The main conditions in the 2026 guidelines are as follows.

• Duration. For doctoral programs, four years in total: one year of Korean language training and three years of degree study. Applicants with TOPIK Level 5 or 6 can be exempted from language training.
• Age. Under 40 (born on or after September 1, 1986). Current professors from ODA recipient countries must be under 45.
• Grades. Applicants must meet one of the following for their most recent degree: 80 or higher out of 100, ranking within the top 20%, or a CGPA of 2.64/4.0, 2.80/4.3, 2.91/4.5 or 3.23/5.0 or higher.
• Benefits. Round-trip airfare (economy class, actual cost), tuition of up to about $3,728 (KRW 5,000,000; check the original guidelines for whether this is per semester or per year; the admission fee is covered by the university) and Korean language training costs of about $3,877 (KRW 5,200,000). The living allowance during degree study is about $12,348 (KRW 16,560,000) a year. Divided by 12, that comes to about $1,029 (about KRW 1,380,000) a month, and the amount may change depending on budget conditions.

As of November 4, 2026, the 2027 GKS graduate guidelines have not been released. If the schedule follows that of 2026, the announcement is expected in February, applications in February and March, and final results at the end of June (2026 results were posted on July 1). To compare it with other scholarships, see the 2027 map of Korea study abroad scholarships; for the differences between the two tracks, see GKS graduate scholarship: Embassy Track and University Track.

The D-2-4 visa and rules for lab work

Visa documents. Once admitted, the university issues a standard admission letter (Certificate of Admission), and the student applies for a doctoral student visa (D-2-4). New doctoral students submit a master's degree certificate as proof of their highest level of education, and it must be apostilled or certified by a Korean consulate. GKS scholars submit an invitation letter issued by the president of NIIED instead of the standard admission letter.

Proof of funds. Applicants submit a bank balance certificate covering one year of tuition and living expenses. It must be in the name of the applicant or a parent (or a sibling if the parents are deceased) and issued within 30 days of the application date. The balance must be maintained throughout the permitted period of stay. Check with the diplomatic mission and the university whether a scholarship certificate can replace the bank balance certificate.

E-visa. Doctoral entrants at IEQAS-certified universities can obtain an e-visa through the Korea Visa Portal (visa.go.kr), except for nationals of Cuba, Syria, Macedonia and Kosovo. The first visa issued is a single-entry visa with a period of stay of up to two years. The application process is outlined in our guide to applying for a D-2 student visa after admission.

Lab research allowances. Students who take part in study-related research at their university or its industry-academic cooperation foundation and receive a research allowance do not need a part-time work permit. For research unrelated to their studies, a permit is required. By contrast, being employed as a "researcher" by a company or an industry-academic cooperation foundation is not allowed on a D-2 visa and requires a change of status.

Part-time work. Master's and doctoral students can apply for a part-time work permit without any length-of-stay requirement. They must have completed alien registration and have a confirmation from the university's international student officer and an employment contract. Permitted weekday hours during the semester are as follows.

• 15 hours a week if the Korean language standard (or the English standard for English-track students) is not met
• 30 hours a week if the standard is met, with no limit on hours on weekends and during vacations.
• Up to 35 hours a week for those who meet the standard and also meet the requirements for enrollment at a certified university, academic excellence and Korean proficiency (check the detailed requirements with the university's international student officer)

English-track students meet the standard with scores such as TOEFL iBT 71, IELTS 5.5 or CEFR B2. If the previous semester's average is below C (2.0), the permit may be restricted.

Extension of stay. Degree-program visas are extended in increments of up to two years. Students enrolled in degree programs at certified universities with an average of C (2.0) or higher may skip the financial documents. However, nationals of countries designated by notice of the Minister of Justice and of countries under focused management are excluded from this exemption. The cap on special extensions of stay, such as after completing the program, is a maximum of eight years after doctoral enrollment (seven years for two-year doctoral programs). Extensions are restricted for a leave of absence taken for personal reasons.

Pre-application checklist

• I have noted the fall 2027 (September) application schedule for each school (KAIST: January 7 to February 5).
• I have read recent papers by two or three prospective advisors and prepared contact emails.
• I have checked whether my target schools guarantee full tuition and a monthly stipend, or whether this varies by lab.
• I have checked whether the department has a BK21 education and research group.
• I have worked out in advance whether I meet the age and grade criteria in the 2027 GKS graduate guidelines (expected in February).
• I have planned for an apostille on my master's degree certificate and a bank balance certificate covering one year.

--- Admission schedules and funding are based on each university's official information as of November 4, 2026; BK21 amounts on the guidelines revised in February 2023; GKS on the 2026 guidelines; and visa and employment rules on the Ministry of Justice visa and stay services manual (October and November 2026 editions). Amounts that apply to 2027 entrants may change.