Settlement Support Consulting

Tax / Year-End Filing Completed

I am a graduate student who received research funds and payments from external projects. Do I need to file a Comprehensive Income Tax Return?

Application Date 2026-10-30 15:13
Consultant Hannah

I am an international Ph.D. student at a university in Korea. I receive research-related payments from my university every month, and last year I also received additional payments for participating in external research projects and giving lectures. Taxes were already withheld from some of these payments, so I assumed that all of my tax obligations had already been settled. However, I was told that I may still need to file a Comprehensive Income Tax Return in May. Do graduate students also need to file a separate tax return?

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Comments 1

Hannah Consultant

(Date Posted) 2026.10.30

Whether you are required to file a Comprehensive Income Tax Return is not determined simply by your status as a student. The first thing to check is how each payment was classified for Korean tax purposes. Even when payments are generally referred to as “research funds” or “research allowances,” they may be treated differently for tax purposes depending on the paying institution and the contractual relationship. For example, they may be classified as employment income, business income, other income, or in some cases as non-taxable income. You should therefore first check your income payment statements on Hometax or review the withholding tax receipts issued by the institutions that made the payments to identify how each source of income was reported. For example, if you received salary under an employment contract and it was classified as employment income, and your employer or university properly completed the year-end tax settlement, you would generally not need to file a Comprehensive Income Tax Return in May solely because of that employment income. However, if compensation from external projects or advisory work was reported as business income and tax was withheld at the time of payment, you may still be required to file a Comprehensive Income Tax Return. The amount withheld is generally treated as tax paid in advance rather than necessarily being your final tax liability. If a payment was classified as other income, whether it must be combined with your other income for tax reporting purposes will depend on the amount and the nature of the payment. Therefore, rather than assuming that no further filing is required simply because tax was already withheld, you should first review your income statements for the previous year and identify the amounts classified as employment income, business income, and other income. Your filing requirement can then be determined based on those classifications.

Even when payments are generally referred to as “research funds” or “research allowances,” they may be treated differently for tax purposes depending on the paying institution and the contractual relationship. For example, they may be classified as employment income, business income, other income, or in some cases as non-taxable income.

You should therefore first check your income payment statements on Hometax or review the withholding tax receipts issued by the institutions that made the payments to identify how each source of income was reported.

For example, if you received salary under an employment contract and it was classified as employment income, and your employer or university properly completed the year-end tax settlement, you would generally not need to file a Comprehensive Income Tax Return in May solely because of that employment income.

However, if compensation from external projects or advisory work was reported as business income and tax was withheld at the time of payment, you may still be required to file a Comprehensive Income Tax Return. The amount withheld is generally treated as tax paid in advance rather than necessarily being your final tax liability.

If a payment was classified as other income, whether it must be combined with your other income for tax reporting purposes will depend on the amount and the nature of the payment.

Therefore, rather than assuming that no further filing is required simply because tax was already withheld, you should first review your income statements for the previous year and identify the amounts classified as employment income, business income, and other income. Your filing requirement can then be determined based on those classifications.

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