US 10-Year Yield Hits 5% Record, Pushing Korea Rates Up

The 10-year US Treasury yield exceeded 5% on the 14th. This is the highest level in 35 months. The move followed oil prices rising above $100 per barrel. Market participants expect the Federal Reserve to raise benchmark rates this week. The European Central Bank already increased its rate to 2.65% last week.

Korean Treasury bond yields rose across the board in response. The 10-year yield climbed 6.4 basis points to 4.6%. The 5-year yield increased 6.6 basis points to 4.345%. The 3-year yield rose 6.6 basis points to 4.091%. Longer-term yields also moved higher. The 20-year yield reached 4.618% and the 30-year yield hit 4.729%.

US Yield Threshold Triggers Global Shift

The 5% mark is considered a critical threshold for global markets. Exceeding this level can shift investment flows away from risk assets. It also impacts the real economy through higher lending costs. US fiscal deficits and expanding AI investment had already cooled demand for Treasuries. New inflation data from rising oil prices strengthens the case for tighter monetary policy.

Korean Corporate Short-Term Debt Surges

Korean corporations increased issuance of commercial paper and short-term bonds. Total issuance reached 1,272.85 trillion won. This represents a 68% increase from the previous year. Both categories hit record highs for a half-year period. The outstanding balance of these instruments stood at 69.7 trillion won as of August.

These instruments have maturities ranging from days to a few months. Companies must refinance at current market rates upon maturity. If rates rise, the interest burden increases immediately at each rollover. This contrasts with long-term bonds, where interest costs remain fixed until maturity. The Financial Supervisory Service noted that 73% of long-term corporate bond issuance was used to repay existing debt.

Refinancing Costs Rise for Borrowers

GN auto markets/bonds: corporate bonds data shows a structural shift in funding. Net issuance of short-term instruments doubled from 8 trillion won to 16.6 trillion won. Corporations favor shorter maturities to avoid locking in high rates for long periods. This strategy increases exposure to rate volatility. A sustained rise in global rates will directly increase repayment burdens for these firms.