Refinancing a loan in Korea: how to calculate whether it pays

What refinancing is

In Korea, refinancing (often called loan switching) means taking out a new loan and using it to repay an existing one. There are usually three goals: moving to a lower rate to cut interest, changing the term or repayment method to adjust the monthly burden, and consolidating scattered loans into one that is easier to manage. You might switch products within the same lender or move to another lender. Either way, the original loan is being repaid before maturity, so an early repayment fee may apply, and the new loan is a fresh loan that is screened from scratch. Refinancing is therefore not simply a matter of moving somewhere cheaper; it is a new contract where costs and conditions must be weighed together. Interest grows when rates fall or after your credit improves, but quite often the calculation shows that staying put is better.

The online loan transfer service

Moving a loan used to mean visiting both the new and the old lender, submitting documents and handling the repayment yourself. To reduce this hassle, Korean financial authorities built infrastructure that processes loan transfers between institutions electronically, starting with unsecured loans in 2023 and later expanding to mortgages and jeonse deposit loans. Users load their loans in a loan comparison platform or a lender's app, compare the terms offered by several institutions and choose where to move. Once the new loan is executed, repayment of the old loan is handled between the institutions, so the borrower does not move money directly. Not every loan is eligible, and service hours, eligible products, participating lenders and conditions can change with operating policy. Rates shown on platforms are often pre-screening estimates and may differ from the final rate. Check the Financial Services Commission's guidance and each lender's or platform's notices for how to use it.

Costs of switching

The benefit of refinancing comes from the rate gap, but costs arise in several places. The largest is usually the early repayment fee on the existing loan. It is large if the contract is recent and generally disappears after the three years set by law. The new loan has costs too. Stamp duty may apply to the loan contract depending on the amount, and for a mortgage, registering new collateral and cancelling the old one can incur costs. Who bears which cost varies by product, so check the product description. Some costs are less visible: losing a preferential rate on the existing loan, or having to meet new conditions such as salary deposits or card spending to get the new loan's preferential rate. If you cannot meet those conditions, the rate rises and the expected gain shrinks. The calculation only works when every cost is included.

• The early repayment fee on the existing loan
• Stamp duty and other costs of the new loan
• For secured loans, collateral registration and cancellation costs
• Preferential rates you lose and new conditions you must meet

A worked example

Numbers make the decision easier. The following are assumptions that only show the structure. Suppose you move a 60 million won bullet-repayment unsecured loan at 6% a year to a loan at 5%. Assume an early repayment fee rate of 1% with one year passed in a three-year fee period: the fee is 60 million × 1% × (24 months ÷ 36 months) = 400,000 won. A one-percentage-point gap saves 60 million × 1% = 600,000 won a year, about 1.2 million won over the remaining two years. Subtracting the fee leaves about 800,000 won, from which the new loan's costs must still be deducted. But if the gap is only 0.3 points, you save just 180,000 won a year, or 360,000 won over two years, less than the 400,000 won fee, so you lose money. On loans where principal falls monthly, such as equal installments, the shrinking balance makes the real saving smaller than above. Comparing the total interest of the old and new terms with a loan repayment calculator is the most accurate approach.

What changes besides the rate

Because refinancing is a new loan, more than the rate changes. First, you are screened again. If your income has fallen or other debts have grown since the original loan, the new limit may come in below the existing balance, and since the lending rules in force at that time apply, an amount that was possible before may not be now. Second, the term and repayment method can change. Extending the term lowers the monthly burden but lengthens the period you pay interest, which can raise total interest. Third, the rate type can change. Moving from variable to fixed or the reverse shifts who bears future rate risk. Fourth, the new loan comes with its own early repayment fee clause. If you plan to switch again when rates fall further, that clause can tie your next choice. Rather than comparing only the rate figure, set these four side by side so you are comparing like with like.

Common misconceptions

Misconceptions about refinancing usually come from leaving the decision to a single rate figure. It is common to apply after seeing a low rate on a platform and then get a different rate after screening, or to miss the expected rate because of unknown preferential conditions. Some people give up comparing for fear that repeated inquiries will lower their credit score, but inquiry records themselves are not reflected in credit score calculation. Once a new loan is actually executed, however, changes in the number and amount of loans can be reflected. The thing to watch most closely is texts or calls offering low-rate refinancing. Being told to send money to a personal account to repay the old loan first, or to install an app, is a classic financial fraud pattern. In a legitimate refinancing, the old loan is repaid between institutions, so if you get such a request, stop and verify through the institution's official contact details. The common misconceptions are below.

• 'A lower rate is always a win' — you can judge only after deducting fees, costs and remaining time
• 'Just checking lowers my score' — inquiry records are not reflected in credit score calculation
• 'The platform rate is final' — it may be a pre-screening estimate that varies with preferential conditions
• 'Lenders call first to suggest refinancing' — requests to wire money to a personal account or install an app suggest fraud

Steps to check before switching

Following the order below keeps calculations and paperwork from getting tangled. The starting point is knowing exactly where your existing loan stands: balance, rate, remaining term, repayment method, and how much early repayment fee applies and until when. Next, organize the terms of candidate loans under the same headings, add up all costs and compare them with the interest saved. Count only preferential conditions you can actually keep. Finally, check the new loan's early repayment fee and rate type to make sure it does not narrow your future choices too much. If there is no hurry, waiting until the fee period ends before switching is also an option. After deciding, do not forget to confirm that the old loan was actually repaid and closed. If an automatic transfer for the repaid loan remains, cancel it as well.

• Check the existing loan's balance, rate, term, repayment method and fee
• Organize candidate loans' rate, term, preferential conditions and costs in the same format
• Subtract fees and costs from the total interest gap to find the net gain
• Check the new loan's early repayment fee and rate type
• After execution, confirm the old loan was repaid and closed

Common situation 1: consolidating several unsecured loans

People with several loans, such as card loans or non-bank loans, often want to combine them into a single bank unsecured loan. Replacing high-rate loans with a lower-rate one cuts interest, and having one payment date and amount also reduces the risk of missing payments. A few things need checking, though. If the new limit falls short of the total, only part can move, and the principle then is to repay the highest-rate loan first. And if you start using the freed card limit or overdraft account again after consolidating, debt can actually grow. Consolidation is a tool for simplifying repayment, not something that reduces debt, so it is better to close limits you will not use after moving. A longer term may lower the monthly payment but raise total interest, so check the full interest with a calculator.

Common situation 2: moving a mortgage after rates fall

When market rates fall, owners of mortgages taken at higher rates wonder whether to move. Because the amounts are large and the terms long, even a small rate gap adds up, but fees and collateral costs are larger too. If you are within three years of the contract, check the early repayment fee first, and if the three-year mark is near, calculate whether waiting is better. You also need to decide between fixed and variable. Choosing variable in hopes of further cuts may pay off, but if rates rise instead, the burden grows. And because you are screened again under the rules and income standards in force at that time, you may not be able to borrow as much as your current balance. Before moving, it is also worth asking your current lender whether you can request a rate cut. If your credit has improved, the rate may come down without moving at all.

Limits and disclaimer

This article explains the general structure of refinancing in Korea and how to compare costs. Operating details of the loan transfer service, such as eligible products, service hours and participating lenders, can change, and rates, fees and other costs differ by lender, product and time. The calculation example is an assumption to show the structure, not actual terms. Before moving a loan, compare the existing loan agreement with the new product description and confirm the expected early repayment fee and final rate with the lenders. How to use the service and the latest rules can be found in guidance from the Financial Services Commission and the Financial Supervisory Service and in each lender's notices. Products, terms and rules vary by company and over time, so always check the terms and official guidance before signing. This article is not financial advice recommending any lender or product; it sets out criteria for judging. If you are contacted with a refinancing offer, verify it directly through that institution's official contact details.