The newborn special didimdol loan is a home purchase loan of up to 400 million won at a fixed 1.8–4.5%, available to households that gave birth to or adopted a child within two years of the application date and hold no home (or one home, in the case of refinancing). The thresholds are combined annual income of 130 million won or less (200 million for dual-earner couples) and net assets of 511 million won or less, with the special rate applying for a base period of five years.
Borrow the same 400 million won and the rate ranges from 2.3% to 4.5% depending on income band — a spread of 154.1 million to 329.6 million won in total interest over a 30-year term. Clearing the eligibility bar matters less than which row of the rate table your income lands in.
Who qualifies: 130m won income, 511m won in assets
Per the Housing and Urban Fund portal, eligibility covers households that gave birth to or adopted a child within two years of the application date, as a head of household owning no home — or one home, for refinancing. Combined annual income must be 130 million won or less; dual-earner couples may go up to 200 million won provided one spouse earns 130 million won or less. Net assets must be 511 million won or less on the 2026 basis.
The cap is 400 million won. Contracts signed before 27 June 2025 keep the older 500 million won ceiling, but everything after that date is capped at 400 million. LTV is 70% (80% for first-time buyers, 70% in the capital region and regulated zones) and DTI is capped at 60%. Applications must be filed within three months of the ownership transfer registration date — miss it and the application cannot be accepted at all.
Refinancing an existing loan is allowed but cannot exceed the outstanding balance, except within three months of the ownership transfer registration, when a higher amount may be requested. Early repayment fees are calculated as 0.6% × (3 years − days elapsed) / 3 years, though repayments made between 12 August 2024 and 31 December 2026 are waived, per KB Kookmin Bank's guidance.
Borrow 400 million won over 30 years — what is the monthly payment?
The rate table is built from combined annual income crossed with loan term. Below, the published 30-year special rates are applied to 400 million won and worked out on an equal principal-and-interest basis. Monthly payments are rounded to the won; total interest is the monthly payment times 360 months, less the 400 million won principal.
| Combined annual income | 30-year special rate (%) | Monthly payment (KRW) | Total interest (10k KRW) |
|---|---|---|---|
| Up to 20m won | 2.3 | 1,539,215 | 15,412 |
| 20m–40m won | 2.5 | 1,580,533 | 16,900 |
| 40m–60m won | 2.7 | 1,622,392 | 18,406 |
| 60m–85m won | 2.9 | 1,664,955 | 19,938 |
| 85m–100m won | 3.1 | 1,708,068 | 21,490 |
| 100m–130m won | 3.3 | 1,751,828 | 23,066 |
| (Dual) 130m–150m won | 3.5 | 1,796,181 | 24,663 |
| (Dual) 150m–170m won | 4.0 | 1,909,663 | 28,748 |
| (Dual) 170m–200m won | 4.5 | 2,026,741 | 32,963 |
The gap between the top and bottom rows is 487,526 won a month, or 175.5 million won compounded over 30 years. Because each income band adds 0.2 percentage points, households sitting near a band boundary should first confirm which income year the application uses.
A shorter term lowers the rate but raises the monthly burden: within the same income band, the 10-year rate is published 0.5 percentage points below the 30-year rate. Term selection, though, is better decided after checking the constraint from how stress DSR trims the borrowing limit rather than from the rate gap alone.
Passing the eligibility test matters less than the income band you land in afterwards — that single row moves 30 years of interest by more than 170 million won.
Didimdol or beotimmok — which fits your situation?
Buying a home means didimdol; renting on a jeonse (lump-sum deposit lease) means beotimmok. The income requirement is identical, but asset limits, caps and the nature of the rate differ. The decisive difference for long-term planning is that didimdol is fixed-rate while beotimmok is variable.
| Item | Newborn special didimdol (purchase) | Newborn special beotimmok (jeonse) |
|---|---|---|
| Income requirement | Combined 130m won or less (200m dual-earner) | Same |
| Asset requirement | Net assets 511m won or less | Net assets 345m won or less |
| Loan cap | Up to 400m won (LTV 70%, 80% first-time) | Up to 80% of the deposit, max 240m won |
| Rate | 1.8–4.5% fixed | 1.3–4.3% variable |
| Special rate period | 5 years base, +5 years per additional birth (max 15) | 4 years base, +4 years per birth (max 12) |
| Early repayment fee | 0.6% × (3yr − days elapsed) / 3yr, waived through 31 Dec 2026 | None |
| Application deadline | Within 3 months of ownership transfer registration | Within 3 months of final payment or move-in (renewals: 3 months from renewal date) |
For beotimmok, the deadline extends to six months where combined annual income is 50 million won or less. Refinancing under either product cannot exceed the outstanding balance, and beotimmok refinancing additionally caps out at 80% of the deposit. Households that fall outside the newborn special thresholds should start by comparing the standard didimdol loan against bogeumjari-ron.
Rate discounts and year six — where the special rate ends
The published rate is a starting point; discounts stack. The items listed in the fund's guidance are as follows.
- Housing subscription savings holder: 0.3–0.5%p (up to 5 years)
- Electronic real estate contract: 0.1%p (up to 5 years)
- Each additional child born: 0.2%p (up to 15 years)
- Each minor child: 0.1%p (up to 5 years)
- Low loan-amount application: 0.1%p (up to 5 years)
- Early repayment of 40% or more of principal: 0.2%p
- Unsold regional housing: 0.2%p (5 years)
- Property outside the capital region: 0.2%p reduction
Take a household in the 60m–85m won band starting at 2.9% on a 30-year term. Adding 0.5%p for subscription savings, 0.1%p for an electronic contract and 0.1%p for one minor child cuts 0.7 percentage points, bringing the rate to 2.2%. On 400 million won, the monthly payment falls from 1,664,955 won to 1,518,807 won — 146,148 won a month, or 52.6 million won over 30 years. That is a substantial sum for three checkboxes. KB Kookmin Bank's guidance also describes cases where stacking every available discount brings the floor down to 1.2%.
Most discounts, however, cap out at five years. The special rate itself runs five years by default, after which the loan converts to a separate rate based on combined income at the time the loan was taken out. Each additional child extends the special period by five years, up to a maximum of 15. If you choose a 30-year term, what the rate converts to from year six is the first clause to check in the loan agreement. The total-interest figures above assume the special rate holds for the full term, so actual cost depends on the post-conversion rate.
What to check
- Whether the birth or adoption date falls within two years of the application date — a single date decides eligibility
- The income year used in the assessment, and each spouse's income separately — the 200m dual-earner band requires one spouse at 130m or below
- Net assets as of the assessment date — how much headroom you have against 511m (didimdol) or 345m (beotimmok)
- Whether the contract date precedes 27 June 2025 — this separates the 500m and 400m caps
- The three-month deadline from ownership transfer registration — work backwards from the final payment schedule
- Which rate discounts apply, and the term cap on each (mostly five years)
- The conversion clause after the special rate ends — what the year-six monthly payment becomes
- Whether 400 million won is actually available at your purchase price within LTV 70% (80% first-time) and DTI 60%
