Korea Bonds and the Bank of Korea: KTBs and Won — 2026-09-08

Top developments

South Korea Plans Up to 222.8 Trillion Won in 2027 Bond Issuance

The South Korean government has announced plans to issue up to 222.8 trillion won ($162.7 billion) in bonds in 2027, a figure nearly matching this year’s record levels. This issuance plan aligns with President Lee Jae Myung’s expansionary fiscal agenda, which aims to stimulate growth through increased public spending. The massive supply outlook is a key driver for long-term yields, as investors anticipate potential oversupply in the KTB market.

Insurers Pull Out of Bond Market as Yields Climb

Four major Korean life insurers have cut their government bond holdings by 13.9 trillion won year-to-date as of early September 2026. This significant divestment by key domestic institutional buyers raises concerns about upward pressure on long-term yields, particularly for the 10-year KTB. The move reflects insurers' strategy to manage duration risk or rebalance portfolios amid rising interest rates and volatility.

Korea Cuts Retail Treasury Bond Premium to a Third

The premium on Korea’s retail treasury bonds has fallen to one-third of its April level, leading to undersubscription of the 10-year issue for a third consecutive month. This sharp decline in the retail premium suggests waning demand from individual investors, who may be shifting towards other assets or waiting for higher yields. The undersubscription highlights a potential weakness in domestic retail support for KTBs at current yield levels.

Local view

Yonhap News Agency reported on September 8 that Korean bond yields closed slightly higher, reversing earlier intraday gains. The market remained cautious due to global factors, including oil price fluctuations and U.S. Treasury yield movements. Local analysts are closely watching the interplay between domestic supply pressures and external rate shocks.

Financial News (fnnews) highlighted the "thin ice" situation in the bond market, noting that the U.S. 10-year Treasury yield is testing the 5% level. This week features large-scale treasury auctions and corporate bond issuances, creating a tense environment for Korean bond traders who must navigate both domestic supply and global rate volatility.

Context & numbers

• 2027 Issuance Plan: Up to 222.8 trillion won ($162.7 billion).
• Insurer Holdings: Major life insurers reduced government bond holdings by 13.9 trillion won in 2026.
• Retail Premium: Retail treasury bond premium dropped to 1/3rd of its April peak.
• Yield Context: The 3-year KTB yield was recently noted at 3.93%, with the U.S. 10-year Treasury near 4.8%.

On the radar

• U.S. Treasury Auctions: Large-scale U.S. Treasury auctions this week could impact global yield curves and spillover into Korean markets.
• Corporate Bond Supply: A surge in corporate bond issuances in both the U.S. and Korea is expected to test liquidity.
• WGBI Inflows: Continued monitoring of foreign investor flows into Korean bonds following WGBI inclusion, though recent data shows some net selling in July.