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Equal Installment:
β’ Pay the same amount (principal + interest) every month
β’ Higher interest proportion initially, increasing principal proportion over time
β’ Easy to plan repayment schedule
π¦ Loan Interest & Repayment Calculator
When taking out a loan, the most important thing is to choose the repayment method that suits you. This calculator helps you make an informed decision by accurately calculating the monthly repayment amount and total interest for both equal installment and equal principal methods.
Monthly Payment (Fixed)
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Total Repayment
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Total Interest
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Principal
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Loan Period
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Loan Repayment Method Comparison
02
Equal Principal:
β’ Pay the same principal amount every month with separately calculated interest
β’ Higher initial payments that gradually decrease
β’ Lower total interest burden than equal installment
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Which Method to Choose?
β’ If you have initial capital capacity: Equal Principal (total interest savings)
β’ If you want stable repayment: Equal Installment (fixed repayment amount)
Learn more
01
Understanding Loan Interest Calculations in Korea
Calculating loan interest is one of the most crucial factors when taking out a loan in Korea. Various loan products exist including home mortgages, personal loans, and jeonse (housing deposit) loans, each with different interest rates and repayment methods. As of 2025, Korea's average home mortgage rate remains around 4-5%, while personal loan rates are typically 5-7%. Accurate interest calculation helps you understand the total repayment amount and assists in financial planning. For long-term loans, even a 0.1% difference in interest rates can result in hundreds of thousands of won difference. According to the Financial Supervisory Service, the average household debt in Korea as of 2024 is approximately 90 million won, making loan interest a significant burden on household finances.
02
Equal Installment Repayment Method Features
The equal installment (equal principal and interest) repayment method is the most widely used loan repayment method in Korea. This method involves paying the same amount each month, making financial planning easier. For example, if you borrow 300 million won at 4% annual interest for 30 years, you would pay approximately 1.43 million won consistently each month. Initially, the interest portion is higher and the principal portion is lower, but over time the principal repayment portion gradually increases. The advantage of this method is the ease of budget management due to fixed monthly payments. According to Korea Housing Finance Corporation data, approximately 70% of all home mortgages use the equal installment method.
03
Benefits of Equal Principal Repayment Method
The equal principal repayment method involves paying the same principal amount each month, with interest calculated separately on the remaining balance. The biggest advantage of this method is that the total interest burden is less than the equal installment method. For example, when borrowing 300 million won at 4% for 30 years, repaying with the equal principal method results in total interest of about 180 million won, compared to about 210 million won with equal installment method, saving approximately 30 million won. Initial repayment amounts are higher (about 1.83 million won in the first month) but gradually decrease, reaching about 840,000 won in the last month. This method is suitable for those with initial capital capacity who want to reduce long-term interest burden.
04
Korean Home Mortgage Rate Trends
Home mortgage rates in Korea fluctuate based on the Bank of Korea's base rate and market conditions. As of 2025, the base rate is maintained at 3.5%, and commercial bank home mortgage rates average 4-5%. Interest rates have fluctuated significantly in recent years - from the low 2% range in 2021, rising to 5-6% in 2022-2023, and gradually stabilizing from 2024. Major commercial banks including KB Kookmin, Shinhan, Hana, and Woori Bank each offer different preferential rate conditions, with loan limits and rates varying according to LTV (Loan to Value) and DTI (Debt to Income) regulations. First-time homebuyers and newlyweds can receive lower rates through government support.
05
Differences Between Personal and Home Mortgage Loans
Personal loans and home mortgages, the two most common loan types in Korea, differ in several aspects. Personal loans are unsecured loans based solely on creditworthiness, with interest rates higher than home mortgages. As of 2025, personal loan rates average 5-8%, which is 1-3 percentage points higher than home mortgages (4-5%). Personal loan limits can be up to 150% of annual income, with total financial institution loan limits capped at 200% of annual income. In contrast, home mortgages can be up to 70% of property value (for properties under 900 million won), with lower rates and terms extending up to 50 years. Home mortgages offer long-term low-interest financing preferred for home purchases, but the collateral setup process is complex and time-consuming.
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Loan Repayment Precautions and Tips
Several important factors should be considered when repaying loans. First, check early repayment fees. Most Korean banks charge fees (usually 1-2% of remaining balance) for early repayment within 3 years of the loan. From 2024, early repayment fee exemption limits have been expanded, allowing fee-free repayment up to a certain percentage of the loan balance. Second, making partial early repayments when surplus funds are available is advantageous for interest savings. Third, consider loan refinancing. Switching existing loans to lower interest rate loans when rates decrease can reduce interest burden. Fourth, for home mortgages, interest income deduction (up to 20 million won annually) is available, which must be claimed during year-end tax settlement.