Mortgage loans stood at 1,190.8 trillion won ($852 billion) at the end of June, accounting for about 63 percent of the country’s 1,891.3 trillion won in outstanding household loans, according to Bank of Korea (BOK) data released Aug. 19.
Higher market rates were already feeding into borrowing costs in July.
New bank mortgages averaged 4.48 percent. Fixed-rate mortgages rose 23 basis points from the previous month to 4.76 percent, while variable-rate loans increased by a smaller 8 basis points to 4.35 percent.
As the gap widened, the share of fixed-rate products among new mortgages fell to 31.9 percent.
At an Aug. 26 briefing, the BOK attributed the increase in mortgage rates partly to higher benchmark rates, including five-year bank bond yields.
Many fixed or mixed-rate mortgages are priced against medium-term financial bond yields, so banks can raise new loan quotations as those benchmarks climb. Variable-rate loans generally respond through funding benchmarks such as COFIX and borrowers’ scheduled rate resets.
The pressure therefore reaches borrowers at different speeds. The BOK’s monthly lending-rate averages capture loans actually extended during the month, after banks have begun repricing.
“When central banks broadly turn hawkish, market rates price that in first, and the move then feeds through to bank bonds,” said Park Hyung-jung, an economist at Woori Bank.
Park said the AAA-rated five-year financial bond yield, a key benchmark for fixed mortgage products, stood at around 4.57 percent Tuesday and was approaching 4.6 percent.
“If the rate-hike cycle continues and bank bond yields rise accordingly, we may need to consider the possibility of the upper end of mortgage rates exceeding 8 percent if the five-year yield approaches 5 percent,” Park said.
Pressure on domestic borrowing costs could persist as major central banks maintain tighter policy settings.
“The three-year government bond yield moved above 4 percent around Sept. 11 and has not returned to the 3 percent range since,” said Min Hyun-ha, a research fellow at Hana Institute of Finance.
“The BOK is one factor, but the Fed and the Bank of Japan are also raising rates, while the Bank of England has left open the possibility of an increase,” Min said. “From here, bond yields broadly point to the upside, and lending rates are likely to rise accordingly.”
Tighter bank lending controls have also raised questions about whether borrowers are turning to nonbank lenders. Official figures show an uneven shift.
Nonbank household lending fell by 0.8 trillion won in August, although mortgage lending increased by 0.3 trillion won, according to Financial Services Commission (FSC) data released at a Sept. 9 household-debt review meeting.
Over the first eight months of the year, however, nonbank household lending rose by 13.5 trillion won, far exceeding the 5.1 trillion-won increase for all of 2025. Mutual-finance institutions accounted for 10.1 trillion won of this year’s increase.
The growth has not extended broadly to card and capital companies. Household lending at credit-specialized finance companies fell by 0.3 trillion won in August and rose by just 0.4 trillion won over the first eight months.
The FSC said BOK rate increases and higher market rates were adding to repayment burdens, calling for particular care to protect lower-income and vulnerable borrowers. Authorities would also encourage banks to expand long-term fixed-rate mortgages to reduce exposure to future rate swings.
For the BOK, household debt cuts both ways. Higher rates can curb housing demand and borrowing, easing financial-stability risks. But they also raise repayment costs for households already carrying large debts.
The central bank has maintained its tightening stance, raising its base rate by 25 basis points in both July and August to 3.00 percent.
At his Aug. 27 policy press conference, BOK Gov. Shin Hyun-song said a preemptive response was needed because inflation was expected to remain above target. Tighter policy could also help moderate the recent rise in Seoul-area housing prices and household debt, he said.
The BOK reiterated that position in its Sept. 10 Monetary Policy Report, saying it would determine the “timing and pace” of additional rate increases while monitoring inflation, growth and financial stability.
How quickly higher market rates reach household borrowers will help shape that calculation.
The next reading comes Wednesday, when the BOK releases August lending-rate data. By the Monetary Policy Board’s Oct. 22 meeting, policymakers will have to weigh how much further to tighten as households absorb the increases already under way.
AJP Takeaways
- South Korean households carried 1,190.8 trillion won in mortgage debt at the end of June, about 63 percent of outstanding household loans.
- Rising bond yields are pushing up mortgage rates, with the timing of the impact depending on loan benchmarks and borrowers’ rate-reset schedules.
- The BOK continues to signal further tightening as it balances inflation and housing-market risks against mounting household repayment burdens.
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