There are three boxes to check: the definition (principal and interest / income), what the formula includes and excludes, and what the official pages show. None of the pages this post checked is an official window that displays "my DSR".
This post covers Korean lending rules, and the linked official sources are in Korean.
1. What is DSR?
This is the original text of the entry "Debt Service Ratio (DSR)" in the Bank of Korea's 700 Economic and Financial Terms (8th printing, 2023. The posting page notes no difference in content between the 8th and 9th printings of 2023).
"An indicator of the principal and interest repayment burden relative to the borrower's repayment capacity, calculated by dividing the annual principal and interest repayments on all loans held by the borrower by annual income." (S1)
The Financial Services Commission's formula is one line.
DSR (Debt Service Ratio) = principal and interest repayments on all household loans / annual income (S2)
Example in the Financial Services Commission press release: with an annual income of 30 million won and principal and interest of 10.27 million won, the DSR is 34.2%. (S2)
Example in the Financial Services Commission video: with an annual income of 50 million won and annual principal and interest of 20 million won, the DSR is 40%. (S13)
DTI is compared on only one box. Both are entries in the 700 Terms. (S1)
| Item | Debt-to-Income ratio (DTI) | Debt Service Ratio (DSR) |
|---|---|---|
| 700 Terms formula | (Annual principal and interest repayments on the mortgage loan in question + annual interest repayments on other debt) / annual income × 100 | Annual principal and interest repayments on all loans / annual income |
| Principal | Only mortgage loan principal repayments | Principal repayments on all loans, including mortgage loans |
700 Terms: "They differ in that DTI includes, among principal repayments, only mortgage loan principal repayments, whereas DSR (Debt Service Ratio) includes principal repayments on all loans, including mortgage loans." (S1)
2. What is divided by what — numerator and denominator
The term's definition, the total loan amount that determines applicability, and the exclusions in the regulatory calculation are different layers. They are not mixed into one sentence.
What the term's definition lists as included (700 Terms)
"Loans include overdraft accounts, credit loans, jeonse deposit loans, car installment financing and so on." (S1)
How the total loan amount is counted under the borrower-level regulation
"From January 2022, the 'total loan amount' that determines whether a borrower is subject to borrower-level DSR is the sum of all household loans across the financial sector (including loans applied for). Credit-line loans (overdraft accounts) are counted at the credit limit rather than the amount actually used, and where an existing loan is scheduled to be repaid with a new loan, the amount scheduled for repayment is excluded when calculating the total loan amount." (S3)
Threshold: borrower-level DSR applies when the total loan amount, adding existing loans and the new application, exceeds 200 million won (100 million won from July 2022). (S3, S4)
The Financial Services Commission video describes the applicability check as "the total of the household loans you currently hold and the loan you will borrow," and gives mortgage loans, credit loans, overdraft accounts, card loans, car installments and student loans as examples of what is added up. For exceptions, "be sure to check with the financial institution for your individual situation." (S13)
Loans exceptionally excluded from the regulatory calculation (13 items in the original Q&A)
This list is the Financial Services Commission's attached Q&A as republished by Korea Policy Briefing, 2021-10-29. (S3)
- Interim payment loans for pre-sale housing
- Relocation loans for reconstruction and redevelopment housing, and interim payment loans for additional contributions
- Interim payment loans for pre-sale officetels, etc.
- Low-income financial products (New Hope Seed Loan, Bakkwodeurim Loan, Saitdol Loan, Jinggeom Daeri Loan, Sunshine Loan for university students and youth, etc.)
- Small credit loans of 3 million won or less (including securities-backed loans)
- Jeonse deposit loans (excluding loans secured by jeonse deposits)
- Housing pension (reverse mortgage)
- Loans handled under agreements such as interest subsidies with the government, public institutions, local governments and the like for policy purposes
- Loans handled urgently under government policy, such as support for natural disaster areas
- Insurance policy loans
- Commercial vehicle financing
- Deposit- and savings-backed loans
- Installments, leases and cash advances
The parenthesis in item 6, "excluding loans secured by jeonse deposits," is read as removing them from this exclusion list. The original contains no sentence spelling out that interpretation. (S3)
Card loans have been included in the borrower-level DSR calculation since January 2022. (S4)
From January 2022, the maturity applied in the DSR calculation was shortened to the average maturity: credit loans 7 years→5 years, non-mortgage loans 10 years→8 years. (S4)
3. How it is used in loan screening
700 Terms: "Since announcing in the second half of 2018 a plan to have financial institutions use DSR, which allows a more comprehensive assessment of a borrower's debt repayment capacity, in their credit screening, the scope of DSR regulation has been continuously expanded." (S1)
Borrower-level limit: when a household loan is made to a borrower whose total loan amount will exceed 100 million won, DSR is limited to within 40% for banks and 50% for non-banks. (Main points of the announcement of Financial Services Commission Notice No. 2022-30, 2022-09-01. S5) The amended Regulation on Supervision of Banking Business in the same notice sets 40% for banks. A press reference of November 17, 2025 reconfirms the same 40%/50%. (S6)
| Content | Figure and date | Source |
|---|---|---|
| Phase 2 | Total loan amount over 200 million won, from January 2022 | [S4] |
| Phase 3 | Total loan amount over 100 million won, from July 2022 | [S4][S3] |
| Borrower-level limit for the non-bank sector | 60%→50%, from January 2022 | [S4] |
| Borrower-level limit for banks | 40% | [S4][S5][S6] |
| Notice codifying the rule | No. 2022-30, 2022.9.1 | [S5] |
| Card loans included in the calculation | From January 2022 | [S4] |
It is not retroactive. "The new regulatory method applies from new loan applications, and there are no cases such as applying it retroactively to existing loans and recalling them." (S3)
Stress DSR is a system that calculates the limit by adding a certain level of add-on rate when calculating DSR. It is not charged on the actual loan rate. (S7, S8)
| Phase | Date and scope | Source |
|---|---|---|
| Phase 1 | From 2024.2.26, bank-sector mortgage loans. First-half stress rate 0.38% | [S9] |
| Phase 2 | From September 2024, bank mortgage and credit loans, non-bank mortgage loans | [S7] |
| Phase 3 | From 2025.7.1, household loans subject to DSR in all sectors. Stress rate 1.50%. Credit loans only when the balance exceeds 100 million won | [S7] |
| Mortgage loans outside the capital region | Phase 2 maintained also from 2026.1.1 to 6.30 | [S8] |
Final applied rate = stress rate × basic application ratio × application ratio by loan type. (S8)
Framework of the stress rate: the highest weighted average rate on new household loans of deposit banks over the past 5 years − the current rate, with a cap and a floor. (S8, S9)
The application ratio for mortgage loans outside the capital region after July 1, 2026, and the stress rate notified at that point, are not in the materials this post received, so they are not given.
4. Where to look
No dedicated official lookup page for "my DSR" has been confirmed. Below is only what each page shows.
| Site | What it shows | DSR figure | Source |
|---|---|---|---|
| FINE loan calculator | Monthly payment (interest and principal repayment), total interest paid | None. Not a DSR calculator | [S10] |
| FINE my loan information lookup → integrated account information management service | Loan transaction records at banks, card companies, savings banks, low-income finance, installments and leases. Money-lending businesses are not provided | None | [S11] |
| Account Info | Financial information lookup (insurance and loan information). Daily 09:00–22:00 | None | [S12] |
| Korea Federation of Banks household loan rate comparison | Rate comparison disclosure | None | [S17] |
Whether you are subject to it is checked with the financial institution after adding up the household loans you hold and the new application. (S13)
5. Formula table
| Formula | Source |
|---|---|
| Annual principal and interest repayments on all loans / annual income | [S1] |
| Principal and interest repayments on all household loans / annual income | [S2] |
| DTI = (annual principal and interest repayments on the mortgage loan in question + annual interest repayments on other debt) / annual income × 100 | [S1] |
| (Stress) final applied rate = stress rate × basic application ratio × application ratio by loan type | [S8] |
Limit back-calculations from private calculators and monthly limit tables by annual income are not given.
Sources
- [S1] Bank of Korea, 700 Economic and Financial Terms (8th printing, 2023). "Debt Service Ratio (DSR)", "Debt-to-Income ratio (DTI)". https://www.bok.or.kr/portal/bbs/B0000249/view.do?menuNo=200765&nttId=235017
- [S2] Financial Services Commission, household debt management review meeting — plan to introduce DSR management indicators for the non-bank sector, 2019-05-30. https://fsc.go.kr/no010101/73714
- [S3] Korea Policy Briefing, Q&A on DSR regulation when total loans exceed 200 million won, 2021-10-29. https://www.korea.kr/multi/visualNewsView.do?newsId=148894892
- [S4] Financial Services Commission, measures to strengthen household debt management, 2021-10-26. https://www.fsc.go.kr/no010101/76740
- [S5] Financial Services Commission, partial amendment of the Regulation on Supervision of Banking Business, Notice No. 2022-30, 2022-09-01. https://www.fsc.go.kr/po040200/78432
- [S6] Financial Services Commission, recent trends in credit loans and margin loans, 2025-11-17. https://www.fsc.go.kr/no010101/85654
- [S7] Financial Services Commission, implementation plan for phase 3 stress DSR, 2025-05-20. https://www.fsc.go.kr/no010101/84617
- [S8] Financial Services Commission, household loan trends in November 2025 and household debt review meeting, 2025-12-10. https://www.fsc.go.kr/no010101/85824
- [S9] Financial Services Commission, stress DSR for bank mortgage loans from February 26, 2024-02-26. https://www.fsc.go.kr/no010101/81777
- [S10] Financial Supervisory Service FINE loan calculator. https://fine.fss.or.kr/fine/fnctip/lonCalc/view.do?menuNo=900019
- [S11] Financial Supervisory Service FINE my loan information lookup. https://fine.fss.or.kr/main/prc/lo/sub/lo026.jsp?menuNo=9000290
- [S12] Integrated account information management service (Account Info). https://www.payinfo.or.kr/main/main.do
- [S13] Financial Services Commission video, how to check borrower-level DSR, 2022-01-14. https://www.fsc.go.kr/no040102?cnId=1035
- [S17] Korea Federation of Banks consumer portal, household loan rate comparison. https://portal.kfb.or.kr/compare/loan_household_new.php