Borrowing Basics in Korea: How Loans Are Structured

A loan is a contract that spends future income today

In Korea, as elsewhere, a loan means borrowing money you do not have now and promising to repay it from what you will earn later. So the first question is not how much you can get, but what share of your income will go to repayments, and for how many years. Every loan comes down to four elements: the principal you borrow, the interest rate you pay for it, the term over which you repay, and the repayment method that sets how fast the principal shrinks. With the same amount, a longer term lowers the monthly burden but stretches the period over which interest accrues, so total interest rises. With the same rate, the repayment method can change the first few years dramatically. Advertisements usually highlight just one of these numbers, so asking about the other three is where understanding a loan begins. Once you sign, the figures in the contract become what leaves your account every month for years, sometimes decades.

What the lender relies on: collateral, credit or a guarantee

The first thing a lender asks is how it will recover the money if you cannot repay. If you pledge property that can be sold, such as a home or a deposit, it is a secured loan; if the lender relies only on your income and credit history, it is an unsecured credit loan. In between sit guaranteed loans: a public guarantee agency or a surety insurer issues a certificate promising to repay on your behalf, and the bank lends on the strength of it. Jeonse deposit loans are the typical example. The surer the recovery, the less risk the lender carries, so rates tend to be lower and limits higher. The same person will usually be offered a higher rate and smaller limit on a credit loan than on a secured loan. Guaranteed loans can also carry a separate guarantee fee, so comparing rates alone understates their cost. Compare like with like.

• Secured loan: property such as a home or deposit is pledged
• Credit loan: based on income and credit history
• Guaranteed loan: a guarantee certificate acts as the security

What makes policy loans different

Policy loans in Korea are funded by the government's Housing and Urban Fund or other public sources, or carry a public guarantee, and are designed with lower rates or better terms than ordinary products. They serve clear policy goals such as buying a first home, paying a jeonse deposit or covering living costs for lower-income households. They are not open to everyone: you must meet requirements on income, net assets, home ownership and the price or size of the property. Those requirements, rates and limits change with budgets and policy direction, sometimes within the same year. So do not rely on the terms a friend got or an article from a few months ago. Checking the latest criteria from the Housing and Urban Fund, the Korea Housing Finance Corporation and the handling bank at the time you apply is the only safe approach. Missing one requirement means starting over with an ordinary loan, so leave slack in your contract schedule. The policy loan guide covers the process.

How the interest rate is set

The base rate in the news is the policy rate set by the Bank of Korea's Monetary Policy Board; it is not the rate applied to your loan. A Korean bank loan rate usually has three parts. First comes a benchmark reflecting the bank's funding cost, commonly the COFIX index published by the Korea Federation of Banks or bank bond yields. The bank adds a spread reflecting the borrower's credit risk, operating costs and target margin, and then subtracts preferential discounts if you meet conditions such as routing your salary or using its card. When the base rate moves, market rates and COFIX follow, and loan rates adjust with a lag. Because spreads and discounts differ by lender, the same person can receive different rates on the same day. When comparing, calculate with the conditions you can actually meet, not the best-case rate that assumes every discount.

• Loan rate = benchmark rate + spread − preferential discounts
• Benchmark: COFIX, bank bond yields and similar
• Spread: set by the lender for credit risk, cost and margin
• Discounts: reductions for meeting relationship conditions

Fixed, variable, hybrid, and the repayment method

By how the rate behaves over the term, loans are fixed, variable or hybrid. A fixed rate stays the same for the agreed period, making planning easy; a variable rate is recalculated against the benchmark at set intervals. A hybrid starts fixed for a few years and then turns variable, and there are also periodic types that re-fix the rate at regular intervals. How fast the principal is repaid is a separate choice: equal installments of principal and interest, equal principal, or a bullet repayment at maturity. The two axes are independent, so you choose a combination such as variable rate with equal installments. The guide on loan rates and repayment covers rate types, and the guide on equal installments versus equal principal compares the actual numbers with a worked example. Whichever you choose, calculate both a rising and a falling rate case and make sure you can still live on the bad one.

How much you can borrow: the logic of the rules

Loan limits in Korea are not set by the lender alone; financial regulators cap them from above. The logic rests on two questions. First, are you borrowing too much against the collateral? That is LTV, the loan amount relative to the home's value. Second, are repayments too large relative to income? That is DSR, the annual principal and interest on all loans divided by annual income; there is also DTI, which counts mortgage principal and interest plus only the interest on other loans. Banks currently apply a borrower-level DSR cap of 40 percent and non-bank lenders 50 percent (as of 2025). A stress DSR has also been introduced, adding an extra rate in the calculation to allow for possible rate rises. Detailed ratios and scope change by region and over time, so check the Financial Services Commission and bank notices. More useful than memorising ratios is knowing the limit comes from whichever of the collateral test and income test is smaller.

• LTV: loan amount relative to collateral value
• DTI: mortgage repayments plus other loans' interest, relative to income
• DSR: annual repayments on all loans, relative to income
• Stress DSR: a rate add-on for possible future increases

Common misunderstandings about loans

Most misunderstandings come from judging by a single number. The limit a bank offers is the maximum it may lend under the rules and its criteria, not an amount you can comfortably carry. A base rate cut does not lower your loan rate immediately: a fixed rate stays put for its term, and a variable rate changes only when its reset date comes. Assuming that switching to a lower rate always pays is also risky; after early repayment fees, the new loan's costs and the burden of keeping discount conditions, the gain may vanish or turn negative. Many also expect policy loans to be available whenever they qualify, but funds can run out or criteria change, so timing matters. The way to avoid these mistakes is to compare all four elements together with the side costs rather than one figure.

• Thinking the limit equals what you can afford
• Thinking a base rate cut lowers your rate at once
• Thinking a lower rate always makes switching worthwhile
• Thinking policy loans are always available if you qualify

Checks before borrowing: the repayment plan comes first

Once you decide to borrow, plan repayment before choosing a product. Work out what share of income the monthly payment takes, and check whether you could hold out for a few months if rates rose or income paused. A loan repayment calculator shows the monthly burden and total interest once you enter amount, rate, term and method, and a DSR calculator gives a rough idea of the regulatory limit. At signing, read the product description for early repayment fees, the overdue rate and the conditions for keeping discounts. Under Korea's Financial Consumer Protection Act, loan products can be withdrawn within 14 days of receiving the contract documents (check the lender's notice for the details). It is easy to skip these steps when rushed, yet few terms can be changed after signing, so confirming questions in writing beforehand is the surest protection.

• 1. Define the purpose and the amount you truly need
• 2. Calculate the monthly payment as a share of income
• 3. Recalculate assuming rates rise
• 4. Confirm an emergency fund remains apart from the loan
• 5. Compare repayment methods and terms
• 6. Check early repayment fees, overdue rate and discount conditions

Situations people ask about most

Loan questions cluster around three situations. When buying a first home, the key is not what percentage of the price you can borrow but whether the collateral test or the income test binds your limit first. If you already have a credit loan or car installments, the income ratio may fill up first and your mortgage limit may come in smaller than expected. When a jeonse deposit falls short, confirm loan eligibility and the guarantee agency's requirements before signing the lease, so you do not lose the down payment. When you need cash urgently, the easiest money is often the most expensive. Card loans and cash advances also weigh on your credit score, so compare rates and terms before deciding. In every case, it helps to put your income, existing loans and desired amount on one page, so you can compare the figures you are quoted at once.

• First home: does the collateral or income test bind the limit?
• Short on a jeonse deposit: check loan eligibility before signing
• Urgent cash: the easier the money, the more you should compare cost

How to read the guides in this topic

The guides here run from the logic of the rules, to loan types, to repayment methods and life after borrowing. If you are new, start with the DSR and LTV guide to see how limits are set, then move to the mortgage, jeonse loan or credit loan guide that fits your purpose. The equal installments versus equal principal guide shows with a worked example how much the numbers change depending on how you repay. If you already have a loan, the guides on early repayment fees and refinancing cover the costs to weigh before switching, and the guide on the right to request a rate cut explains what you can do when your income or credit improves. If you were declined or offered less than expected, the guide on loan rejection reasons helps pinpoint why. Reading the one guide that fits your situation now works better than reading everything at once. Each guide links to related calculators and further reading.

• Logic of limits: DSR and LTV
• Loan types: mortgage · jeonse loan · credit loan · policy loans
• Repaying: equal installments vs equal principal, early repayment fees, refinancing
• After borrowing: right to request a rate cut, rejection reasons

Limits and disclaimer

The guides in this topic are general explanations of the Korean lending system. They do not recommend any product or lender and are not personal financial advice. Detailed regulatory ratios, stress rates and the rates, limits and income criteria of policy loans change frequently with government announcements and lender policy, and the same product gives different results depending on the borrower's income, credit and collateral. Figures here explain structure, and even those marked as of 2025 may since have changed. Products, terms and regulations differ by company and over time, so before signing, read the product description and terms and check the latest criteria with official sources such as the Financial Services Commission, the Financial Supervisory Service, your bank and the Housing and Urban Fund. If repayment looks likely to become difficult, contact the lender or a public debt counselling service before you fall behind; that is what limits the damage.