Before you ever sit down with a bank, one question usually stops you cold: "Given my income and this home's price, how much can I actually borrow?" Anecdotes from friends or online forums rarely apply directly to your situation, because your income, existing debt, and the regulatory status of the property's location are all different. It is common to walk into a bank expecting one number and walk out with a far smaller approved limit.
In South Korea, a mortgage loan limit is not a matter of guesswork. It is set by a defined combination of rules: LTV, DSR, whether the property sits in a regulated area, and the stress DSR add-on rate. This guide walks through what each metric means, how the limit is actually calculated for real income and home-price figures, and the regulated-area and first-time-buyer rules currently in effect as of 2026. At the end, you can try a free calculator to estimate your own limit.
1. The Three Core Metrics That Set Your Loan Limit
A mortgage limit is never determined by a single number. Banks calculate several caps and then apply whichever is lowest. The three metrics that matter most are:
LTV (Loan-to-Value) — the cap based on the home's price
LTV expresses the maximum loan amount as a percentage of the home price. If a home is priced at 500 million KRW and the applicable LTV is 70%, the maximum secured loan is 350 million KRW. LTV varies sharply depending on whether the property is in a government-designated regulated area, which we cover in detail in Section 3.
DSR (Debt Service Ratio) — the cap based on your total income
DSR measures the ratio of your total annual principal-and-interest payments across all loans — not just the mortgage, but credit loans, card loans, and more — divided by your annual income. As of 2026, commercial banks apply a 40% DSR cap, while non-bank lenders (savings banks, etc.) apply a 50% cap. In practice, someone earning 60 million KRW a year can only take on new debt whose annual repayment stays under 24 million KRW (about 2 million KRW per month) at a bank. Any existing loan repayments reduce this new-loan capacity directly.
DTI (Debt-to-Income) — the older income-based standard
DTI is similar to DSR but only counts mortgage principal-and-interest plus interest on other debts, rather than the full principal-and-interest of every loan. In today's underwriting, DSR has effectively replaced DTI as the binding constraint, so for practical purposes you can treat DSR as the number that decides your income-based limit. DTI still occasionally appears as a secondary reference when regulators define regulated-area criteria.
Put together: LTV sets the "home-price ceiling" and DSR sets the "income ceiling." The bank calculates both and your final approved limit is whichever figure is smaller.
2. Worked Examples: Loan Limits by Income and Home Price
To make this concrete, assume a 4% annual interest rate, a 30-year term, and no existing debt. The DSR cap used below is the 40% bank-level standard.
Example 1: Annual income 60 million KRW, home price 500 million KRW
- DSR-based loan capacity (40% cap): roughly 419 million KRW (calculated backward from an annual repayment cap of 24 million KRW over 30 years, equal principal and interest)
- LTV cap at 70% (non-regulated area): 500M × 70% = 350 million KRW
- LTV cap at 40% (regulated area): 500M × 40% = 200 million KRW
- Final limit: In a non-regulated area, the 350 million KRW LTV cap is the binding constraint since it's lower than the DSR cap. In a regulated area, the limit drops to 200 million KRW.
Example 2: Annual income 80 million KRW, home price 700 million KRW
- DSR-based loan capacity (40% cap): roughly 559 million KRW
- LTV cap at 70% (non-regulated area): 700M × 70% = 490 million KRW
- LTV cap at 40% (regulated area): 700M × 40% = 280 million KRW
- Final limit: 490 million KRW in a non-regulated area, or 280 million KRW in a regulated area.
| Annual Income | Home Price | DSR Cap (40%, 4% rate, 30yr) | LTV Cap (70%, non-regulated) | LTV Cap (40%, regulated) | Final Limit |
|---|---|---|---|---|---|
| 60M KRW | 500M KRW | ~419M KRW | 350M KRW | 200M KRW | 350M (non-reg.) / 200M (reg.) |
| 80M KRW | 700M KRW | ~559M KRW | 490M KRW | 280M KRW | 490M (non-reg.) / 280M (reg.) |
Both examples show the same pattern: whether a property sits in a regulated area can cut your borrowing power nearly in half, even at identical income. Remember that a generous DSR cap does you no good if LTV is the binding constraint, and vice versa — the lower of the two always wins.
3. How Your Limit Changes by Situation
Regulated-area designation — where LTV drops from 70% to 40%
Following the June 27, 2025 household-debt tightening measures, all of Seoul and parts of Gyeonggi Province were newly designated as regulated areas. In these areas, the LTV for home-purchase mortgages dropped sharply from 70% to 40%. On top of that, absolute loan-amount caps now apply by price tier: a maximum of 600 million KRW for homes priced at 1.5 billion KRW or under, 400 million KRW for homes between 1.5–2.5 billion KRW, and just 200 million KRW for homes over 2.5 billion KRW. No income level can push a loan past these hard caps.
First-time homebuyer exception — 70% LTV even in regulated areas
First-time, no-property buyers still get preferential treatment: an LTV of up to 70% (loan cap up to 600 million KRW) regardless of whether the property is in a regulated area. That said, the June 27, 2025 measures lowered this from the previous 80% ceiling, and a new requirement now mandates moving into the property within 6 months of loan disbursement. The gap between first-time-buyer terms and standard terms in regulated areas remains substantial.
Stress DSR stage 3 — the add-on rate currently in effect for 2026
Stress DSR is a mechanism that bakes in the risk of future rate increases: when calculating your DSR, the bank applies an add-on "stress rate" on top of your actual contract rate, which inflates your assumed repayment burden. Stage 3, effective July 1, 2025, raised the stress rate to a full 1.5 percentage points, and this remains in effect as of 2026. Properties outside the Seoul/Gyeonggi/Incheon metro area get a temporary reprieve, however: non-metro mortgages continue to use the lighter Stage 2 rate of 0.75 percentage points through the end of December 2026. Because the add-on rate inflates your assumed monthly payment for DSR purposes, your actual approved limit ends up lower than a simple calculation at your real contract rate would suggest. In one widely reported real-world case, a borrower earning 100 million KRW a year saw their loan limit drop by roughly 120 million KRW after Stage 3 took effect.
The small-tenant deposit deduction — lower limits on tenant-occupied homes
If you are financing a home that already has a tenant, banks also apply a deduction tied to Korea's small-lease-deposit priority repayment system. Before assessing collateral value, the bank subtracts the amount that would be paid first to a small-deposit tenant in a foreclosure scenario. As of 2026, this deduction is 55 million KRW in Seoul, 48 million KRW in the greater metro area, 28 million KRW in metropolitan cities, and 25 million KRW elsewhere — and which figure applies depends on the date the senior mortgage lien was registered, not your purchase contract date. Buying a tenant-occupied property can shrink your effective loan limit by this amount on top of the standard LTV/DSR caps.
2026 reference note: The figures above reflect publicly available Financial Services Commission and banking-sector data as of July 2026. LTV, DSR, regulated-area designations, and the stress DSR grace period are all subject to change with future government measures. Always confirm your actual loan limit with the lending bank under the rules in effect at the time you apply.
4. Frequently Asked Questions
Q1. Are all loans included in the DSR calculation?
Some categories, such as jeonse (lease deposit) loans and small credit loans under 3 million KRW, are excluded or counted under relaxed rules. However, most other debt — overdraft lines, card loans, auto installment loans — is fully counted toward DSR. If you're planning a new mortgage, cleaning up existing debt beforehand can meaningfully improve your available limit.
Q2. How do I check whether a property is in a regulated area?
The Ministry of Land, Infrastructure and Transport and the Financial Services Commission publish current lists of adjustment target areas and speculation overheating districts, which currently include all of Seoul and parts of Gyeonggi. These designations change with each new government measure, so always check the latest official notice right before you apply for a loan.
Q3. Does a variable-rate loan face a bigger stress DSR penalty?
Yes. Variable-rate and hybrid (fixed-then-variable) loans receive a higher add-on rate than fixed-rate loans, since they carry more future rate-change risk. If maximizing your approved limit matters, it's worth comparing fixed-rate loan terms alongside variable options.
Q4. Can I treat the calculator's output as a guaranteed approval amount?
No. Both this calculator and the figures in this article are estimates based on publicly available rules. Your actual approved amount depends on your personal credit score, any other outstanding debt, each bank's internal underwriting criteria, and the exact regulations in force at the time of your application. Always confirm the final number directly with the bank handling your loan.
5. Estimate Your Own Limit with the Loan Limit Calculator
Enter your annual income, interest rate, loan term, home price, and LTV ratio into our Loan Limit Calculator, and it computes both the DSR-based cap and the LTV-based cap side by side, then shows you the lower of the two as your estimated limit. You can also enter your existing annual loan repayments to get a limit closer to your real situation.
Once you know your limit, use our Finance Calculator to simulate the actual monthly payment schedule under equal-principal-and-interest or equal-principal repayment. If you're curious why the repayment method itself has such a large effect on total interest paid, our guide to comparing loan repayment methods covers that in detail.
