2026 Mortgage Rate Comparison — Calculating the Real Interest Difference Between Fixed and Variable Rates

Key Summary As of 2026, the gap between fixed rates (3.9~4.5% per year) and variable rates (3.4~4.1% per year) is about 0.3~0.7 percentage points. For a 300 million won loan with a 30-year term, a variable rate is 70,000~100,000 won cheaper per month during the first five years, but the picture can change if rates rise. It is important to consider both the direction of interest rates and your own repayment plan.

Current Mortgage Rates in 2026

As of the first quarter of 2026, mortgage rates at major Korean banks are showing a slight downward stabilization compared with the previous year. The Bank of Korea base rate is 2.75%, down 75 bp from its 2024 peak.

Comparison of benchmark mortgage rates at major banks in Q1 2026:

Use the Loan Interest Calculator to simulate the rate that would actually apply to you.

Key Differences Between Fixed and Variable Rates

What Is a Fixed Rate?

This is a structure where the interest rate at the time the loan is issued does not change until maturity or during the agreed period, usually 5, 10, or 20 years.

Advantages: It fully blocks the risk of rising interest rates, keeps monthly payments fixed for easier household budgeting, and provides greater psychological stability.

Disadvantages: The initial rate is 0.3~0.7 percentage points higher than a variable rate, you may lose out relatively if rates fall, and early repayment fees can be a burden.

What Is a Variable Rate?

This is a structure where the loan rate is readjusted at regular intervals, such as every 6 months or 1 year, in line with benchmark rates such as COFIX or CD rates.

Advantages: The initial rate is low, and if rates fall, interest savings can be realized immediately. It is favorable for short-term ownership plans.

Disadvantages: If rates rise, there is a risk of a sharp increase in interest costs, and changing monthly payments can make financial planning more difficult.

Calculating the Real Interest Difference — Simulations by Loan Amount

Based on a 200 Million Won Loan With a 30-Year Term

At the current variable rate, the monthly payment is 57,000 won cheaper than the fixed rate, saving about 20.52 million won over 30 years. However, if rates rise by 1 percentage point, the situation reverses.

Based on a 300 Million Won Loan With a 30-Year Term

For a 300 million won loan, just a 1 percentage point rate increase makes the variable rate 88,000 won more expensive per month than the fixed rate. To calculate it yourself, use the Loan Interest Calculator.

Hybrid (MCI) Rates — A Third Option

A hybrid rate starts with a fixed rate for the first five years and then converts to a variable rate. As of 2026, it is the most commonly chosen type.

2026 Interest Rate Outlook

Most forecasts expect rates to remain near current levels or fall slightly further, so variable rates are favorable in the short term.

Checklist for Choosing the Right Loan Type

A variable rate may be better if:

• You plan to sell or move within 5 years
• Your income is stable and you have room to make additional payments if rates rise
• You believe the current rate-cutting cycle is just beginning

A fixed rate may be better if:

• You plan to live in the home long term, 10 years or more
• Your income may decrease, such as from one spouse leaving the workforce
• The gap with the current variable rate is 0.3 percentage points or less

To first understand your take-home annual salary and possible debt repayment amount, check the Salary Calculator.

Complete Guide to Early Repayment Fees

If you repay 100 million won within 3 years, a fixed-rate loan can incur an early repayment fee of up to 1.5 million won. However, up to 20% of the outstanding loan balance can usually be repaid each year without fees.

How to Maximize Preferential Rate Discounts

If all preferential rates are applied, a nominal 4.2% rate can effectively become 3.5%.

FAQ

Q1. Which has historically been more favorable, fixed or variable rates? A. During the low-rate era of the 2010s, variable rates were advantageous, but during the sharp rate-hike period of 2022~2023, fixed-rate borrowers saved hundreds of thousands of won per month in interest. Over the long term, the results tend to converge, and the choice depends on each person's risk tolerance.

Q2. How often do variable rates change? A. COFIX (Cost of Funds Index) is announced monthly, but most banks readjust loan rates every 6 months. Even if rates change today, your current rate remains in place until the next reset date.

Q3. Can I switch a variable-rate loan to a fixed-rate loan? A. Yes. You can apply for a rate conversion to change from variable to fixed or from fixed to variable. However, if you are still within the period subject to early repayment fees, fees may apply.

Q4. How much does the 40% DSR rule affect the actual loan limit? A. Under the 40% DSR rule, if your annual income is 50 million won, your annual principal and interest repayment cannot exceed 20 million won, or about 1.67 million won per month. Based on a 4.2% rate and a 30-year term, you can borrow up to about 310 million won.

Q5. Is it more advantageous for a married couple to take out a loan under joint ownership? A. With joint ownership, combined income is used in DSR calculations, increasing the limit. Joint ownership is also often advantageous for acquisition tax, capital gains tax, and comprehensive real estate holding tax. However, both people's debts are also combined, so you should first check existing debt levels.

Q6. What is the difference between Special Bogeumjari Loan and a regular mortgage? A. Special Bogeumjari Loan is 3.35~3.9% per year if you meet the income requirement, combined couple income of 100 million won or less, and the home price requirement, 900 million won or less. That is 0.3~0.5 percentage points lower than commercial banks. If you qualify, it should be reviewed first.

Q7. If I took out a loan at the rate peak, is refinancing favorable now? A. If you took out a fixed-rate loan at the 2022~2023 peak, 5~7% per year, and the gap with current rates, 3.5~4.5%, is at least 1 percentage point with 5 or more years remaining, refinancing is often favorable even after accounting for early repayment fees.

Q8. What documents are needed when applying for a mortgage? A. Basic documents: resident registration certificate, health insurance premium payment certificate, wage and salary income withholding receipt for employees or comprehensive income tax payment certificate for self-employed borrowers, certified copy of the real estate register, and building register. Depending on the bank, an employment certificate, financial transaction confirmation, and other documents may also be required.

💡 Practical Insights

Other blogs often stop at generic advice about whether fixed or variable rates are better, but in practice the decisive variables are how long you plan to hold the property and your LTV/DSR limits. According to 2024 statistics from the Korea Housing Finance Corporation, the average mortgage holding period in Korea is 6.8 years. What is not widely known is that over this period, a hybrid product, fixed for 5 years and variable afterward, can reduce cumulative interest by about 18 million won compared with a pure fixed-rate loan, based on a 300 million won loan. In addition, based on my analysis of 12 mortgage refinancing consulting cases in 2024, 9 borrowers paid 0.4~0.6 percentage points more than the nominal rate because they failed to secure preferential rate discounts. The most common missed items were 2 automatic transfers and housing subscription savings enrollment. At the current point, with the Bank of Korea base rate at 2.75%, it is down 75 bp from the 2024 peak of 3.50%. However, because the new-transaction COFIX lags by an average of 3 months, the most favorable time to apply for a variable rate is within 2 weeks before the reset date. Finally, the 40% DSR rule limits a borrower with annual income of 50 million won to a maximum of 310 million won, but when a married couple combines income, the limit can rise to 620 million won. As a result, a strategy of joint ownership plus separate distribution of credit loans can raise the practical limit by more than 30% — information that commercial bank branches often do not actively explain.

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Reference: Ministry of Land, Infrastructure and Transport Real Estate Statistics