by Coinstrooper Crypto Articles
Quick Take
  • 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.
  • The 10-year yield reached 3.055% on Thursday, its highest point since August 1996.
  • The Bank of Japan (BOJ) raised rates to 1.25% on September 18, the highest level since 1995.

What Happened

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.

Market Context

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.

Why It Matters

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.

Historically, that risk has hit crypto hard. During the 2024 yen shock, Bitcoin and Ethereum fell roughly 20% as positions unwound.

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.

Details

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

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

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.

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