Japan’s 30-year bond yield climbed to a record 4.223% on Friday. That is the highest level since Tokyo first sold the maturity in 1999.
Borrowing costs are rising across the curve. The 10-year yield reached 3.055% on Thursday, its highest point since August 1996.
Why Japan’s 30-Year Bond Yield Keeps Climbing
Monetary policy is the first driver. The Bank of Japan (BOJ) raised rates to 1.25% on September 18, the highest level since 1995. The board split 7-2, yet the central bank signaled that further hikes remain on the table, according to its statement.
Fiscal strain adds to the pressure. Government ministries requested a record ¥143.1 trillion for fiscal 2027, Reuters reported. Debt servicing alone accounts for ¥36.64 trillion. Meanwhile, the Finance Ministry raised its assumed borrowing rate to 3.8% from 3%.
Selling abroad has also spilled into Tokyo. The US 10-year Treasury yield broke 5% on September 15 during a global bond sell-off. The Federal Reserve then lifted its target range to between 3.75% and 4%.
However, the yen has not benefited. The currency slid toward 158 per dollar after the BOJ decision. A similar split appeared when Japan’s 2-year yield hit a 31-year high in August.
Katsutoshi Inadome of Sumitomo Mitsui Trust Asset Management linked the two trends.
“Japanese bond yields are facing upward pressure as inflation concerns grew on a weaker yen.”
What Japan’s Record Yield Means for Bitcoin
Higher safe returns raise the bar for risk assets. A 30-year Japanese bond now pays more than 4%, which could draw capital away from crypto.
The larger threat sits in the yen carry trade. Investors borrow cheap yen and buy higher-yielding assets abroad. A sharp yen rally would make those loans costlier and could force selling.
Historically, that risk has hit crypto hard. During the 2024 yen shock, Bitcoin and Ethereum fell roughly 20% as positions unwound.
For now, Bitcoin (BTC) trades near $84,033, down 0.5% in 24 hours, according to BeInCrypto data. The wide gap between US and Japanese rates keeps the carry trade open.
Therefore, the yen may be the signal to watch. A sudden reversal in USD/JPY would suggest carry positions are closing, and Bitcoin could feel it quickly.
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