How to Calculate LTV and DSR Mortgage Limits — Complete Guide to the Latest 2026 Regulations

Key Takeaways

• LTV: The loan limit compared with the home price (up to 50% for a single-home owner in regulated areas)

• DSR: Annual principal and interest repayments compared with annual income (must be 40% or lower)

• 2026 Stress DSR Phase 2 applies, which lowers effective borrowing limits even further

What Are LTV, DSR, and DTI? A 3-Minute Overview of the Core Concepts Before applying for a mortgage, you need to understand three core rules: LTV, DSR, and DTI. LTV (Loan To Value)

LTV is the maximum loan amount expressed as a percentage of the home's value.

• LTV 50% → for a 1 billion won home, you can borrow up to 500 million won DTI (Debt To Income)

DTI compares your annual principal and interest payments on debt with your annual income.

• DTI 40% → with annual income of 60 million won, annual principal and interest payments can be up to 24 million won DSR (Debt Service Ratio)

DSR is stricter than DTI. It counts principal and interest payments on all debt, including mortgages, credit loans, card loans, and other borrowings.

• DSR 40% → annual income of 60 million won × 40% = 24 million won in total annual principal and interest repayment capacity
• If you already have a credit loan, your available mortgage limit will fall accordingly

Latest 2026 Regulatory Status — Stress DSR The Stress DSR, introduced in 2024, is tougher than the existing DSR rule. Even when current interest rates are low, lenders calculate your borrowing limit as if rates were higher by applying a stress rate. Stress DSR Phase 2 (2026 standard):

• Stress rate add-on: +1.5%p (adds 1.5% to the benchmark rate)
• Example: if the actual loan rate is 4%, the limit is calculated at 5.5% As a result, even with the same income and the same actual rate, real borrowing limits have dropped by 10-15%.

LTV Limits by Regulated Area (2026 Standard) | Category | Regulated Area | Non-Regulated Area |

1 billion won apartment, annual income of 80 million won, no-home owner, regulated area - LTV limit: 1 billion won × 50% = 500 million won

• DSR limit: 80 million won × 40% = 32 million won/year → about 540 million won based on a 30-year term
• Actual limit: min(500 million won, 540 million won) = 500 million won To estimate your own borrowing limit, try the LTV Calculator.

Strategies to Maximize Your DSR Limit Strategy 1 — Pay Down Existing Debt First

Paying off credit loans, overdraft lines, student loans, auto installments, and similar debt before you apply creates more room under DSR and can increase your mortgage limit. Strategy 2 — Extend the Loan Term For the same loan amount, extending the term from 30 years to 40 years lowers annual principal and interest payments, which reduces your DSR. The tradeoff is that you will pay more total interest. Strategy 3 — Use Combined Household Income Calculating DSR with both spouses' income can raise the limit significantly. However, the spouse will also become a joint guarantor. Strategy 4 — Use Special Bogeumjari Loan Special Bogeumjari Loan is a government-supported product with more favorable DSR treatment. It can be useful for low-income households and newlyweds. To understand the full cost of buying real estate, including acquisition tax, also check the Acquisition Tax Calculator.

Interest Rate and Loan Repayment Simulation In 2026, mortgage rates at major banks are around 3.5-5.5% per year. Even with the same 500 million won loan, the monthly payment can change sharply depending on the interest rate. | Interest Rate | Monthly Payment on 30-Year Term | Total Interest |

Expert Key Summary In 2026, Stress DSR Phase 2 has pushed effective mortgage limits lower. Your actual borrowing limit is the lower of the LTV limit, such as 50% for a single-home owner in a regulated area, and the DSR 40% limit. Before applying, you can improve your limit by paying down existing debt, extending the term, and using combined spousal income. Start by checking government-supported products such as Special Bogeumjari Loan and Didimdol Loan, which may help reduce costs and taxes.

FAQ Q1. Does the 40% DSR apply the same way at all banks?

In the first-tier financial sector, meaning commercial banks, DSR 40% applies. In the second-tier financial sector, such as savings banks and capital companies, DSR 50% applies. However, second-tier lenders usually charge higher interest rates. Q2. I heard LTV rises to 80% when buying a first home. Is that true? Borrowers eligible for the first-time homebuyer acquisition tax reduction may be allowed up to 80% LTV. However, the maximum loan cap is 600 million won, and the 40% DSR rule still applies. Q3. What is the LTV in non-regulated areas? No-home owners and single-home owners in non-regulated areas may qualify for up to 70% LTV. That is 20%p higher than in regulated areas. Q4. Does taking out a credit loan reduce my mortgage limit? Yes. Annual principal and interest payments on credit loans are included in DSR, which reduces the available mortgage amount. If possible, take out a credit loan after your mortgage is approved. Q5. Are jeonse loans also subject to DSR? In principle, jeonse loans are subject to DSR, but guarantee insurance products such as HUG and SGI are often excluded from the DSR calculation. Check with your bank branch. Q6. How can self-employed borrowers get a loan if income verification is difficult? Self-employed borrowers usually prove income with comprehensive income tax returns and VAT returns. If reported income is low, the loan limit falls, so honest tax filing is more favorable for borrowing over the long term.