Japan's Interest Rates Return to 1996: Can Bitcoin's 'Decoupling Narrative' Withstand September's Rate Hike?

The alarm bells are ringing for Japanese bonds as we examine the linkage risks between Bitcoin and the yen carry trade.

Written by: Ashrith Rao

Compiled by: Saoirse, Foresight News

The cost of borrowing in Japan has reached its highest level since 1996. On the same day, the yield on 30-year government bonds hit 4.185%, while the yield on 10-year government bonds was reported at 2.945%.

For a country that has long relied on negative interest rates to combat deflation, this marks a significant shift in the landscape.

Meanwhile, Bitcoin surged 22% over the past week, crossing the $80,000 mark for the first time since May. The core contradiction explored in this article is that while the Japanese bond market is experiencing severe turbulence, the cryptocurrency market appears relatively resilient.

The Underlying Logic of the Carry Trade

In recent years, the yen carry trade has been a significant force driving global risk asset markets. Investors borrow cheap yen, convert it to dollars, and then purchase various higher-yielding assets.

According to the Bank for International Settlements, offshore non-bank entities have borrowed approximately $250 billion in yen; using a broader measure, this figure could reach $500 billion. Such a massive leverage is built on a core assumption: that Japanese interest rates will remain near zero for the long term. However, the current reality has overturned this old assumption.

In June, the Bank of Japan raised its policy rate to 1.0%, the highest in 31 years.

The market widely expects that at the monetary policy meeting on September 17-18, the central bank will raise rates again. The unique monetary environment that Japan has maintained for the past thirty years is collapsing, and the 2.88% yield on 10-year government bonds is not just a cold number. If the yen appreciates rapidly, the carry trade positions could quickly turn from profit to loss.

Goldman Sachs' Praneet Shah stated, "Just a movement in the exchange rate can completely swallow the annualized returns of all positions."

In August 2024, this scenario played out: due to the appreciation of the yen, Bitcoin fell from about $64,600 to $49,000 on August 5. The Tokyo Stock Exchange Price Index (TOPIX) also plummeted 12% in a single trading day.

But the situation is different now.

This month, the yen has given back more than half of the gains from the exchange rate intervention and is currently in a weakening state, trading at about 159 to the dollar. A weaker yen will renew the attractiveness of the carry trade, making the Bank of Japan's future policy direction regarding the yen a matter of high vigilance.

The Debt Cliff

At the end of June, Japan's national debt reached a record high of 1,346 trillion yen (approximately $9.1 trillion). The Japanese government expects the debt level to rise to 1,492 trillion yen by the end of this fiscal year. Prime Minister Kishida Fumio announced that starting in April 2027, the consumption tax will be reduced to 1% for two years, which will create an additional fiscal gap of 5 trillion yen.

This creates a tricky dilemma: Japan needs higher interest rates to stabilize the yen and curb inflation; however, raising rates will significantly increase the burden of interest payments on its massive national debt.

The Bank of Japan announced that starting in April 2027, it will slow the pace of debt reduction, indicating that policy priorities will focus on market stability rather than a rapid normalization of monetary policy. Even so, the bond market has already shown clear signs of lack of confidence.

Japan has sold some U.S. Treasury bonds to fund the exchange rate intervention in August. In June, holdings of U.S. Treasuries decreased by $26.4 billion, bringing total holdings down to $11.17 trillion. This is the largest single-month reduction among countries globally, directly pushing the yield on 10-year U.S. Treasuries up to 4.74%.

Debt pressure is not unique to Japan; it reflects a global trend of debt adjustment, with one of the sources of contradiction being the United States.

The Illusion of Bitcoin's Decoupling

In the face of these macroeconomic upheavals, Bitcoin has remained largely unaffected, stabilizing above $78,700. This resilience challenges the traditional logic of 'risk appetite.' The key question is: is this a true market decoupling, or merely a temporary illusion before the storm?

The logic of a pessimistic scenario is clear: if the Bank of Japan significantly raises interest rates and the yen strengthens, concentrated unwinding of carry trades could trigger a deleveraging of global risk assets.

During the August 2024 sell-off, Bitcoin was highly correlated with Japanese stocks, proving that Bitcoin cannot remain aloof. Additionally, as Japanese yields rise and interest-bearing asset returns increase, the attractiveness of Bitcoin, which does not generate interest, will decline.

An optimistic scenario, however, presents another possibility. If the yen continues to depreciate, Bitcoin could become an attractive safe-haven choice for Japanese investors.

This is not purely theoretical speculation. Ray Dalio believes that Japan's debt situation supports the allocation value of Bitcoin, and he suggests a small allocation to Bitcoin while allocating 10-15% of assets to gold.

The participation of Japanese institutions is also on the rise. For example, Nomura's crypto subsidiary, Laser Digital, has obtained Japan's first new cryptocurrency exchange license in four years. Nomura's research shows that 79% of respondents plan to invest in Bitcoin within the next three years.

Japan's revised Financial Instruments and Exchange Act has reclassified cryptocurrencies as financial products, which is expected to facilitate the launch of spot crypto ETFs by 2027, along with independent tax rules. The Japan Exchange Group may launch a spot crypto ETF as early as 2027.

As the regulatory framework becomes clearer, macro-level pressures continue to accumulate.

The Policy Turning Point in September

The next monetary policy meeting of the Bank of Japan is scheduled for September 17-18. Most institutions predict that the interest rate will be raised to 1.25%.

The bond market will fully price in expectations, but Bitcoin may not be able to fully absorb them. What truly warrants caution is not the act of raising rates itself, but the central bank's statements regarding future policy constraints.

If the Bank of Japan signals that 1% is merely a transitional phase toward a 2% rate, the yen will strengthen rapidly, and carry trades will face large-scale unwinding. Conversely, if the statements reflect concerns about debt sustainability that limit the space for rate hikes, the yen will weaken further, and Bitcoin may benefit from a weaker dollar and continued domestic buying in Japan.

The yield levels of 1996 should be viewed as a risk warning signal rather than a market-driving factor. What truly drives the market is the direction of the yen, not a specific exchange rate number. Currently, the yen is depreciating, and Bitcoin is rising. If the Bank of Japan's meeting in September changes mainstream market expectations, this correlation could suddenly reverse.

The current mainstream pricing in the market is that Japan's debt problem will evolve slowly and will not lead to a sudden collapse. Bitcoin investors are not waiting for a reversal of carry trades; they are already trading on the expectation of a weaker yen and continued institutional inflows.

This logic has the potential to hold, but it still needs to be viewed cautiously in light of the historical patterns of Japanese interest rates. For the first time in thirty years, the yield on 30-year government bonds is approaching 4%, which will inevitably have far-reaching market implications.