The Service shall compute the interest which is to be calculated in addition to a lump-sum refund in calculating the lump-sum refund pursuant to Article 77 (2) or 116 (1) of the Act, by multiplying a period from the month following the month a pension premium is paid (including a postponed contribution under Article 92 of the Act) to the month in which any of the following dates falls by an interest rate of fixed deposits with maturity of three years for the relevant period (where the interest rate is changed during the period of calculating interest or the interest rate is different depending on banks, an applicable interest rate shall be the average interest rate applied by banks conducting business throughout the country among the banks established pursuant to the Banking Act as of January 1 of the relevant year):
1. Where the Service calculates a lump-sum refund pursuant to Article 77 (2) of the Act: The date a ground corresponding to any of the subparagraphs of Article 77 (1) of the Act arises;
2. Where the Service calculates a lump-sum refund pursuant to Article 116 (1) of the Act: Any of the following dates:
(a) Where a lump-sum refund is paid pursuant to Article 67 (1) 1 of the former Act (referring to the provisions amended by the National Welfare Pension Act (Act No. 3902) and subsequently repealed by the National Pension Act (Act No. 5623)), it shall be the date five years have passed from the date a cause for the payment of a lump-sum refund to a beneficiary arose; where a beneficiary reaches age 60 before five years lapse, emigrates overseas, loses his/her nationality, or is insured by another public pension, it shall be the date the relevant cause for payment arose;
(b) Where a lump-sum refund is paid under Article 77 (1) 3 of the Act and Article 67 (1) 4 of the former Act (referring to the amended provisions by the National Pension Act (Act No. 6027)), it shall be the date the relevant cause for payment arose.

(1) A lump-sum refund to be returned to the Service by a person paid the lump-sum refund under Article 78 (1) of the Act with interest accrued thereon (hereinafter referred to as "repayment of a lump-sum refund") shall be repaid by the end of the month immediately following the month in which the date of application for the repayment of a lump-sum refund falls in case of repayment in lump sum, or by the end of each month from the month immediately following the month in which the date of application for the repayment of a lump-sum refund falls in case of repayment in installments.
(2) Where the Service allows the lump-sum refund to be repaid in installments pursuant to Article 78 (2) of the Act, it shall divide lump-sum refund amount by the number of months that counts towards the insurance coverage period, within the following frequency, at the request of an obligor for repayment, so that it can be repaid on a monthly basis:
1. Where the insurance coverage period is less than one year: Three installments;
2. Where the insurance coverage period is between at least one year but less than five years: 12 installments;
3. Where the insurance coverage period is at least five years: 24 installments.
(3) Interest to be added to a lump-sum refund pursuant to Article 78 (1) and (2) of the Act shall be calculated by the following applicable methods. In such cases, if the period over which interest is calculated exceeds one year, interest shall be calculated on a yearly basis to include the interest so calculated in the principal, and interest thereafter shall be re-calculated:
1. For lump-sum payment: an amount calculated with regard to a lump-sum refund based on the interest rate on a term deposit with one-year maturity applied during the period from the month a lump-sum refund is repaid to the month preceding the month an application for the repayment of a lump-sum refund is filed;
2. For repayment in installments: an amount calculated with regard to each installment based on the interest rate on a term deposit with one-year maturity applied during the period, beginning with the month a lump-sum refund is repaid, and ending with the month immediately preceding the month repayment in installments is made.
(4) Matters necessary for filing an application for the repayment of a lump-sum refund shall be prescribed by Ordinance of the Ministry of Health and Welfare.
(5) Deleted.

Persons facing circumstances prescribed by Presidential Decree, such as abscondence from home and missing, and thus are not paid lump-sum death payment, and first cousins or closer collateral blood relatives eligible to be paid a lump-sum death payment pursuant to the proviso to Article 80 (1) of the Act, whose livelihood is supported by a deceased currently or formerly insured are specified in attached Table 1.
[This Article Wholly Amended by Presidential Decree No. 23908, Jun. 29, 2012]

Where at least two persons exist in the same priority order to be paid a lump-sum death payment under Article 80 (3) of the Act, Article 40 shall apply mutatis mutandis to the payment method.