Japan’s 30-year sovereign bond yield climbed to a record 4.223% on Friday, marking the highest point since Tokyo initially issued the maturity back in 1999.
Across the entire curve, borrowing costs are moving upward. On Thursday, the 10-year yield touched 3.055%, marking its peak since August 1996.
Why Japan’s 30-Year Bond Yield Keeps Climbing
Shifting monetary policy serves as the primary catalyst. The Bank of Japan (BOJ) increased rates to 1.25% on September 18, reaching the highest level since 1995. Even though the board split 7-2 on the decision, the central bank indicated in its statement that further rate hikes remain possible.
Budgetary pressures compound this strain. According to Reuters, government ministries requested a record ¥143.1 trillion for the 2027 fiscal year, with debt servicing alone accounting for ¥36.64 trillion. In response, the Finance Ministry elevated its assumed borrowing rate from 3% to 3.8%.
External selling pressure has also reached Tokyo. A global bond sell-off pushed the US 10-year Treasury yield past 5% on September 15, following which the Federal Reserve raised its target range to between 3.75% and 4%.
Despite these developments, the Japanese yen has failed to gain strength, sliding toward 158 per dollar following the BOJ announcement. A similar divergence occurred in August when Japan’s 2-year yield hit a 31-year high.
Katsutoshi Inadome, representing Sumitomo Mitsui Trust Asset Management, connected these two movements.
“Japanese bond yields are facing upward pressure as inflation concerns grew on a weaker yen.”
What Japan’s Record Yield Means for Bitcoin
Attractive safe-haven returns elevate the hurdle for risk-on assets. With a 30-year Japanese bond now yielding upwards of 4%, capital could potentially rotate away from cryptocurrencies.
A more significant hazard lies within the yen carry trade, where investors borrow low-cost yen to purchase higher-yielding foreign assets. A sudden surge in the value of the yen would increase the expense of those loans and could trigger forced liquidation.
In past instances, this exact risk heavily impacted the crypto market. During the 2024 yen shock, both Bitcoin and Ethereum dropped roughly 20% as market participants unwound their positions.
At present, BeInCrypto data shows Bitcoin (BTC) trading near $84,033, down 0.5% over a 24-hour period. Because a wide spread remains between US and Japanese interest rates, the carry trade continues to function.
Consequently, the yen serves as a critical indicator to monitor. An abrupt shift in the USD/JPY exchange rate would signal that carry trade positions are being closed out, an event Bitcoin could feel rapidly.