As of the second half of 2026, the limit calculation for a mortgage in a non-regulated provincial area adds 0.75 percentage points, while one in the capital region or a regulated zone adds 3.0. At the same income, the same term, and the same actual interest rate, the borrowing limit differs by 21%. According to Newspim, the eased treatment for provincial areas is fixed to the window from July 1 to December 31.
The gap is doubly compounded. Provincial areas remain on the second-stage standard, where a 1.5% stress rate is applied at a 50% weighting, producing an effective 0.75 points. In the capital region and regulated zones, the stress rate itself was raised to 3.0% and is applied at 100%, so the full 3.0 points lands. Twice the base rate, twice the weighting — four times the result.
The stress rate is not interest you pay
One misconception to clear first: the stress rate is a hypothetical add-on used only when calculating the limit. A borrower with an actual rate of 4.5% taking a mortgage in the capital region pays interest at 4.5%, but the payment tested against their income is the one computed at 7.5%. It is a device that prices in future rate risk by holding the limit conservative.
DSR itself is annual principal-and-interest payments divided by annual income, and bank mortgages must keep that ratio at or below 40%. At an income of 50 million won, annual payments must stay within 20 million. Add a stress rate and the principal that same 20 million can support shrinks — which is how the limit gets cut.
Loan type changes the weighting again. As Herald Business reports, variable, hybrid, and periodic-reset products each carry different application ratios, and long-term fixed loans with terms of 21 years or more and a fixed portion above 70% take no stress rate at all. Credit loans and other borrowings attract the 1.5% stress rate at a 100% weighting once their combined balance exceeds 100 million won.
How far the limit diverges at the same income
Fix the conditions and the size of the gap emerges. The figures below assume an actual rate of 4.5%, a 30-year term, equal principal-and-interest repayment, and a DSR ceiling of 40%, varying only the stress rate. It is a simple calculation that assumes no other debt.
| Annual income | No stress rate (KRW 10k) | Provincial +0.75pp (KRW 10k) | Capital region +3.0pp (KRW 10k) | Reduction vs provincial |
|---|---|---|---|---|
| 50M won | 32,894 | 30,182 | 23,836 | -63.46M won (-21.0%) |
| 70M won | 46,051 | 42,255 | 33,371 | -88.84M won (-21.0%) |
| 100M won | 65,787 | 60,364 | 47,673 | -126.92M won (-21.0%) |
That the reduction is 21.0% regardless of income reveals the nature of the formula. DSR scales linearly with income, so the percentage cut caused by a stress-rate difference is identical across every income band. Only the absolute amount changes. A borrower earning 100 million loses 127 million won to the very same 21%.
The percentage cut from a stress rate is the same at every income. The higher the income, the larger the sum that disappears at that same rate.
The direction matches the government's own estimate from when the capital-region rules tightened. Korea.kr reported that raising the stress rate from 1.5% to 3.0% for mortgages in the capital region and regulated zones would cut limits by 6.6% to 14.7% — about 10% on average — for borrowers earning 50 to 100 million won on a 30-year equal-payment loan at 4%. The 21% above compares provincial areas at 0.75 points directly against the capital region at 3.0; the government's 10% measures only the change from 1.5 to 3.0 points. Different baselines.
What happens after December 31
If the provincial grace period ends and the third stage takes effect, the 1.5% stress rate applies at 100%, lifting the effective add-on from 0.75 to 1.5 points. Recalculated on the same conditions:
| Annual income | Current provincial +0.75pp (KRW 10k) | Stage 3 at +1.5pp (KRW 10k) | Reduction | Percent |
|---|---|---|---|---|
| 50M won | 30,182 | 27,799 | -23.83M won | -7.9% |
| 70M won | 42,255 | 38,918 | -33.37M won | -7.9% |
| 100M won | 60,364 | 55,597 | -47.67M won | -7.9% |
At 7.9%, the shock from losing the provincial grace period is smaller than the 21% gap against the capital region — because moving provincial areas to stage three does not raise their stress rate to 3.0%. That said, this grace period has already been extended twice: first to the end of 2025, then through the first half of 2026, and now to year-end. Whether a third extension arrives depends on provincial housing indicators.
What matters procedurally is the reference date. Korea.kr notes that the capital-region increase does not apply retroactively to loans already disbursed before the rules took effect. The test is not the contract date but the date the loan is actually drawn. For a provincial buyer, the difference between settling before year-end and slipping into January is exactly the gap in the table above.
Where this calculation breaks
The tables assume no other debt whatsoever. In practice, payments on credit loans, car financing, and card loans consume the DSR allowance first, and only what remains becomes mortgage capacity. Once credit and other loans together pass 100 million won, they too take the 1.5% stress rate at full weighting. For the exit side of the same loan, how mortgage prepayment fees are structured is worth reading alongside this.
Separate caps also bind independently of DSR. Korea.kr reported that with all of Seoul and 12 areas of Gyeonggi designated as speculation-overheated zones and land-transaction permit zones, mortgages in the capital region and regulated zones are capped at 400 million won for homes priced above 1.5 billion and below 2.5 billion, and at 200 million for homes above 2.5 billion. Even if the DSR math yields 500 million, that cap stops it at 400. Policy loans run on their own formulas, so the rate structure of the newborn special loan has to be checked separately.
What to check
- Where the property sits — non-regulated provincial area, or a designated regulated zone. The add-on splits between 0.75 and 3.0 points
- The disbursement date — not the contract date. Measure the gap between your settlement schedule and the December 31 end of the provincial grace period
- Rate type — long-term fixed loans of 21 years or more take a 0% stress weighting; variable, hybrid, and periodic-reset products each take their own
- Annual payments on existing debt — how much of the 40% DSR allowance credit loans and installments already consume
- Price-based lending caps — whether the 1.5 billion and 2.5 billion thresholds in regulated zones bite below your DSR limit
- Lender category — the 40% ceiling for banks and 50% for non-bank lenders is a difference in the regulatory ratio itself, not the formula
Sources
- Provincial mortgages stay on stage-two stress DSR as stage-three shift is deferred six months (Newspim)
- Provincial mortgages keep DSR 50% and a 1.5% stress rate in the second half (Herald Business)
- Mortgage limits cut across Seoul and 12 Gyeonggi areas; only 200 million won for homes above 2.5 billion (Korea.kr)