KB Kookmin Bank COFIX and Mortgage Rate Updates – March 2026
As of March 23, 2026, KB Kookmin Bank has announced its latest interest rates for COFIX-based loans and mortgage products. These changes reflect ongoing adjustments in the financial market and impact both modern and existing borrowers. This article provides a detailed overview of the current rates and associated costs, as well as essential considerations for consumers.
COFIX-Based Loan Rates
COFIX, or the Cost of Funds Index, is a key benchmark used by Korean banks to determine interest rates on various loans, particularly mortgages. KB Kookmin Bank offers both variable and mixed-rate mortgage options tied to COFIX.
- KB Star Apartment Mortgage Loan_Variable (Purchase): 4.26% to 5.04% per year. This rate is calculated based on the 6-month COFIX rate of 2.47% per year plus an additional interest rate of 1.79% per year, or the 5-year financial bond rate of 3.87% per year plus an additional interest rate of 1.17% per year.
- KB Star Apartment Mortgage Loan_Mixed (Purchase): 5.04% per year. This rate is based on the 5-year financial bond rate of 3.87% per year plus an additional interest rate of 1.17% per year.
Factors Affecting Applied Interest Rates
The actual interest rate applied to a loan will vary based on several factors, including:
- Additional and Preferential Interest Rates: These rates are added or subtracted based on individual customer profiles and market conditions. The range of preferential interest rates may differ depending on the specific product.
- Market Conditions: Fluctuations in the broader financial market influence base interest rates.
- Customer Creditworthiness: A borrower’s credit score and financial history play a significant role in determining the interest rate.
- Loan Terms: Repayment methods, loan purpose, and loan amount all affect the final rate.
Customers are encouraged to consult with a KB Kookmin Bank branch representative to determine their specific interest rate.
Interest Calculation Methods
KB Kookmin Bank employs different methods for calculating interest depending on the loan repayment structure:
- Lump Sum Repayment (including comprehensive bank account automatic loan): Daily calculation with post-accumulation.
- Installment Repayment: Monthly calculation or daily calculation on a monthly basis.
Fees and Costs
Several fees are associated with mortgage loans:
- Revenue Stamp Fee: No fee applies for loan amounts under KRW 50 million. For amounts exceeding KRW 50 million, fees are as follows:
- KRW 50 million – KRW 100 million: KRW 35,000 (customer share)
- KRW 100 million – KRW 1 billion: KRW 75,000 (customer share)
- Over KRW 1 billion: KRW 175,000 (customer share)
- Mortgage Establishment Costs: The bank covers costs related to registration of establishment (registration and license tax, local tax, registration application fee, and attorney’s fee). Customers are responsible for costs related to the purchase of national housing bonds and registration of reduction/cancellation.
Consumer Rights and Loan Cancellation
KB Kookmin Bank emphasizes consumer protection and provides the following rights:
- Right to Explanation: Financial consumers have the right to receive a clear explanation of product details and services.
- Loan Cancellation: Borrowers can cancel a loan contract within 14 days of receiving the contract documents, concluding the contract, or receiving the loan funds (whichever is latest), provided they return the principal, interest, and any associated expenses in full.
Important Considerations
KB Kookmin Bank advises customers to be aware of the following:
- Credit Score Impact: Taking out a loan can affect your credit score.
- Interest Rate Fluctuations: Interest rates can change during the loan term based on market conditions and creditworthiness.
- Loan Restrictions: Individuals with poor credit history or registered credit recovery support may face loan restrictions.
- Delinquency Penalties: Late payments or defaults will incur overdue interest and may lead to the acceleration of the loan repayment obligation. The delinquency penalty is 3% per annum added to the loan interest rate, with a maximum rate of 15% per annum (or 2% added to the existing rate if it’s already 15% or higher).
Contact Information and Further Resources
For more information, customers can contact KB Kookmin Bank’s Personal Loan Department or visit the following resources:
- Customer Center: 1588-9999
- Website: www.kbstar.com
Compliance officer reviewed No. 2026-1179 (2026.03.23.) – Validity period: 2026.03.23. ~ 2027.03.22.