Korea Bonds and the Bank of Korea: KTBs and Won — 2026-09-02

Top developments

BOK Raises Base Rate to 3% Amid Inflation Pressure

On August 27, the Bank of Korea (BOK) raised its benchmark interest rate by 25 basis points to 3.00%, marking the second consecutive hike. The Monetary Policy Committee cited mounting inflationary pressure, a weakening won, and rising household debt as key drivers for the decision. Concurrently, the BOK revised its 2026 GDP growth forecast upward to 3.3% from 2.6%, reflecting strong semiconductor exports and robust first-half performance.

10-Year KTB Yield Hits 4.418% as Global Yields Surge

Korean Treasury yields climbed sharply in early September as global bond markets reacted to escalating US-Iran tensions and higher oil prices. On September 2, the 3-year KTB yield rose to 3.930%, approaching its yearly high of 3.959%, while the 10-year yield jumped 4.7 basis points to 4.418%. This surge is squeezing borrowers, with mortgage rates potentially lifting toward 8%, raising concerns about financial stability.

Government Plans 222.8 Trillion Won Bond Issuance for 2027

South Korea’s government announced plans to issue up to 222.8 trillion won ($162.7 billion) in bonds in 2027, a figure near this year’s record levels. This expansionary fiscal agenda under President Lee Jae Myung aims to support economic growth but adds supply pressure to an already tight bond market. The increased issuance comes as the BOK tightens monetary policy, creating a complex environment for fixed-income investors.

Foreign Investors Turn Net Sellers of Korean Bonds

Foreign investors sold a net $96 million of South Korean government bonds in July, marking their first net selling since the country’s inclusion in the World Government Bond Index (WGBI). This shift suggests that initial passive inflows from WGBI inclusion may be stabilizing or reversing amid global rate volatility. In August alone, foreign investors pulled 17.5 trillion won from domestic stocks and bonds combined, favoring other Asian markets like Taiwan.

Local view

Local media highlight the "tipping point" risk for Korean bond yields, with Seoul Economic Daily noting that market rates are likely to keep rising due to the BOK's hawkish stance and widening term premiums. E-Today reports that the 30-year bond yield surged 10 basis points, its largest jump in three months, driven by concerns over next year's issuance volume and foreign net selling of three-year futures. Analysts quoted by Yonhap News suggest that September will see differentiation by maturity rather than a uniform trend, as external tightening pressures clash with domestic supply adjustments.

Context & numbers

• Base Rate: 3.00% (Raised by 25 bps on Aug 27, 2026).
• 3-Year KTB Yield: 3.930% (Sep 2, 2026).
• 10-Year KTB Yield: 4.418% (Sep 2, 2026).
• USD/KRW: Approximately 1,380 following the rate hike, near an 11-month low.
• Household Debt: Exceeded 2,000 trillion won, with mortgage rates reaching up to 7.12%.
• 2027 Bond Issuance Plan: Up to 222.8 trillion won.

On the radar

• WGBI Liquidity Measures: The Ministry of Economy and Finance is issuing 500 billion won in seasoned bonds via auction in August to enhance liquidity post-WGBI inclusion.
• Bond Fund Flows: Ultra-short-term bond funds attracted 648 billion won in August as investors shortened duration to avoid rate hike risks, while broader bond funds saw outflows of 385.1 billion won.
• M&G Investment View: M&G Investments predicts a rally in Korean bonds, arguing that the market has priced in too many future rate hikes and that the BOK may slow its tightening pace if inflation eases.