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A renewed surge in South Korean Treasury yields is fueling concerns that the hit will fall hardest on vulnerable borrowers and financially weak companies. With household loans still heavily tied to floating rates, higher rates could quickly raise interest burdens, curb spending and weigh on domestic demand, analysts said.
According to the financial sector on April 27, Treasury yields have continued to rise as markets price in inflation pressure tied to Middle East geopolitical risks and expectations that global monetary tightening will last longer.
Because Treasury yields serve as a benchmark for market rates, moves typically feed into corporate bonds, financial bonds and loan rates within days to weeks. Corporate bond yields and bank lending rates are structured to track Treasury yields, meaning higher long-term rates can spread quickly across the financial system.
In that transmission process, the burden tends to concentrate on weaker borrowers and marginal firms. Since funding costs are Treasury yields plus a credit spread, the lower the credit quality, the larger the increase in actual borrowing costs.
Large companies, with greater access to direct financing such as bond issuance and stronger cash positions, generally have more room to respond early in a rate upswing. Small and midsize firms and marginal companies, however, rely more on bank loans and often have weaker credit, making it more likely that rising rates will tighten funding conditions. If refinancing becomes difficult or new bond issuance costs jump, short-term liquidity pressure can intensify and raise default risks.
Households are also unlikely to escape the impact. With a high share of floating-rate household debt, increases in Treasury and bank bond yields can lift banks’ funding costs and flow through to lending rates via benchmarks such as COFIX, after a relatively short lag. That can quickly raise debt-service burdens, especially for vulnerable borrowers with limited repayment capacity or heavy exposure to floating rates.
Signs of strain are already appearing in financial indicators. The delinquency rate on won-denominated loans at domestic banks stood at 0.62% at the end of February, up 0.05 percentage points from 0.56% a month earlier, the highest in nine months. For February readings, it was the highest in 10 years.
A similar trend is emerging outside the banking sector. As of the end of March, card loan balances at nine major credit card companies totaled 42.9942 trillion won, rising for a third straight month to a record high. The increase points to a balloon effect from tighter bank lending rules and a shift in funding demand toward higher-rate nonbank lenders.
Experts warned that if Treasury yields rise beyond a certain level, the impact could spread from higher interest burdens to broader financial stability risks. If distress grows among vulnerable borrowers and marginal firms, it could weaken financial institutions’ asset quality and lead to tighter credit conditions, they said, calling for preemptive steps.
Kim Sang-bong, a professor of economics at Hansung University, said, “When bond yields rise, the interest burden on floating-rate loans inevitably increases.” He added, “Because prices are expected to keep rising, Treasury yields will also keep rising.” Kim said restructuring is needed for marginal firms and that policies should also aim to curb growth in household debt.
A key concern is that the rate environment may not ease quickly. With the U.S. Federal Reserve maintaining a tightening stance and oil prices rising due to Middle East developments, inflation pressure is persisting. As a result, upward pressure on rates, led by long-term yields, may continue for some time.
Markets are watching next month’s Monetary Policy Board meeting, the first to be chaired by newly appointed Bank of Korea Gov. Shin Hyun-song. The focus has sharpened after first-quarter gross domestic product posted a surprise increase above expectations, strengthening the case for monetary tightening. During his confirmation hearing on the 15th, when he was still a nominee, Shin said, “In the current situation, I will put more weight on prices, especially in an economy like Korea that is so sensitive to oil prices, where the oil shock has a considerable impact on inflation.”
According to the financial sector on April 27, Treasury yields have continued to rise as markets price in inflation pressure tied to Middle East geopolitical risks and expectations that global monetary tightening will last longer.
Because Treasury yields serve as a benchmark for market rates, moves typically feed into corporate bonds, financial bonds and loan rates within days to weeks. Corporate bond yields and bank lending rates are structured to track Treasury yields, meaning higher long-term rates can spread quickly across the financial system.
In that transmission process, the burden tends to concentrate on weaker borrowers and marginal firms. Since funding costs are Treasury yields plus a credit spread, the lower the credit quality, the larger the increase in actual borrowing costs.
Large companies, with greater access to direct financing such as bond issuance and stronger cash positions, generally have more room to respond early in a rate upswing. Small and midsize firms and marginal companies, however, rely more on bank loans and often have weaker credit, making it more likely that rising rates will tighten funding conditions. If refinancing becomes difficult or new bond issuance costs jump, short-term liquidity pressure can intensify and raise default risks.
Households are also unlikely to escape the impact. With a high share of floating-rate household debt, increases in Treasury and bank bond yields can lift banks’ funding costs and flow through to lending rates via benchmarks such as COFIX, after a relatively short lag. That can quickly raise debt-service burdens, especially for vulnerable borrowers with limited repayment capacity or heavy exposure to floating rates.
Signs of strain are already appearing in financial indicators. The delinquency rate on won-denominated loans at domestic banks stood at 0.62% at the end of February, up 0.05 percentage points from 0.56% a month earlier, the highest in nine months. For February readings, it was the highest in 10 years.
A similar trend is emerging outside the banking sector. As of the end of March, card loan balances at nine major credit card companies totaled 42.9942 trillion won, rising for a third straight month to a record high. The increase points to a balloon effect from tighter bank lending rules and a shift in funding demand toward higher-rate nonbank lenders.
Experts warned that if Treasury yields rise beyond a certain level, the impact could spread from higher interest burdens to broader financial stability risks. If distress grows among vulnerable borrowers and marginal firms, it could weaken financial institutions’ asset quality and lead to tighter credit conditions, they said, calling for preemptive steps.
Kim Sang-bong, a professor of economics at Hansung University, said, “When bond yields rise, the interest burden on floating-rate loans inevitably increases.” He added, “Because prices are expected to keep rising, Treasury yields will also keep rising.” Kim said restructuring is needed for marginal firms and that policies should also aim to curb growth in household debt.
A key concern is that the rate environment may not ease quickly. With the U.S. Federal Reserve maintaining a tightening stance and oil prices rising due to Middle East developments, inflation pressure is persisting. As a result, upward pressure on rates, led by long-term yields, may continue for some time.
Markets are watching next month’s Monetary Policy Board meeting, the first to be chaired by newly appointed Bank of Korea Gov. Shin Hyun-song. The focus has sharpened after first-quarter gross domestic product posted a surprise increase above expectations, strengthening the case for monetary tightening. During his confirmation hearing on the 15th, when he was still a nominee, Shin said, “In the current situation, I will put more weight on prices, especially in an economy like Korea that is so sensitive to oil prices, where the oil shock has a considerable impact on inflation.”
* This article has been translated by AI.
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