Japan rate hike misses: the collapse of the yen – What does it mean for Bitcoin?

The Bank of Japan raised interest rates to their highest level in 30 years, but the yen fell to record lows. The result is exactly the opposite of what Japan intended to do.

With the government now signaling a possible intervention in the currency market, the uncertainty is only growing.

Japan warns to “take appropriate action” as yen slides

Monday, he warned Atsushi MimuraJapan’s deputy finance minister for international affairs and the country’s chief diplomat, stressed that the recent foreign currency movements were “one-sided and one-sided.” He added that the authorities are willing to take “appropriate action” if the movements of the exchange become excessive – a clear signal that currency intervention is on the table. Finance Minister Satsuki Katayama made similar comments last weekend, saying Tokyo would respond appropriately to excessive and speculative currency movements.

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The warnings came as the yen hit historic lows. On Monday, the dollar rose to 157.67 yen. The euro hit 184.90 yen, and the Swiss franc hit 198.08 yen, both record lows for the Japanese currency. Market participants believe that the Japanese authorities are likely to intervene if the dollar approaches 160 yen. Last summer, the Bank of Japan sold about $100 billion at similar levels to support the currency.

Why is the yen weakening despite rising interest rates?

Under normal circumstances, rising interest rates strengthen the currency. Higher prices attract foreign capital seeking better returns. On December 19, The Bank of Japan raised its key interest rate by 0.25 percentage points to 0.75%, the highest level since 1995.

However, the yen is moving in the opposite direction. Several factors explain this discrepancy.

First, the tax increases were already entirely affordable. The overnight index swap market had given a near 100% chance of movement ahead of the meeting. This elicited a classic “buy the rumor, sell the news” reaction. Investors who had bought the yen in anticipation of a rate hike sold to lock in profits once the decision was announced, adding downward pressure on the currency.

Second, real interest rates remain very negative in Japan. While the nominal rate rose to 0.75%, inflation remained at 2.9%. This puts the real interest rate – the nominal rate minus inflation – at around -2.15%. In contrast, the United States has a real interest rate of about +1.44%, with interest rates at 4.14% and inflation at 2.7%. The difference between Japanese and American real interest rates exceeds 3.5 percentage points.

This wide spread revived the yen carry trade. In a carry deal, investors borrow money in a country with low interest rates and invest it in higher-interest assets elsewhere. Borrowing the yen at low cost and investing in dollar assets, traders can benefit from the difference in returns. Since real interest rate differentials were in favor of the dollar, investors began to sell yen again and buy dollars.

Third, Expect a press conference from Bank of Japan Governor Kazuo Ueda Markets. Speaking on December 19, Ueda did not provide any clear guidance on the timing of future interest rate hikes. He stressed that “there is no predetermined path for further rate increases” and acknowledged that estimates of the neutral interest rate remain “very uncertain”. Rather, he played down the significance of the decision, noting that reaching the highest rate in 30 years “has no special significance.” Markets interpreted this as a signal that the Bank of Japan was under no pressure to tighten further, and the yen’s decline would accelerate.

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Japan’s Structural Dilemma

Robin Brooks, a senior fellow at the Brookings Institution, points out A more fundamental problem. “Japan’s long-term interest rates are very low given its huge public debt,” he wrote. “As long as this is true, the yen will continue the cycle of depreciation.”

Japanese government debt is 240% of GDP, but the 30-year bond yield is very similar to Germany, a country with much lower debt levels. This is not normal. The Bank of Japan has been suppressing yields by buying huge amounts of government bonds.

“Without this purchase, Japan’s long-term yields would be much higher, pushing the country into a debt crisis,” Brooks explains. “Unfortunately, given the scale of Japan’s debt pile, the choice is between a debt crisis and currency devaluation.”

Brooks noted that on a truly effective exchange rate basis, the yen now rivals the Turkish lira as the world’s weakest currency.

To increase the pressure, Prime Minister Sanae Takaichi sought To an intense financial expansion since his post in October. This is Japan’s largest stimulus package since the COVID-19 pandemic. With government debt already reaching 240% of GDP, markets have become increasingly concerned that flexible fiscal policies may undermine the Bank of Japan’s efforts to stabilize the currency.

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Market Impact: Short-term ease, growing uncertainty

With the yen falling despite rising interest rates, global asset markets are breathing a sigh of relief – for now.

In theory, a rate hike should strengthen the currency and trigger the cancellation of the freight deal. As investors rush to repay yen-denominated loans, they are selling global assets, draining liquidity and pushing up the prices of risky assets such as stocks and cryptocurrencies.

But the reality turns out differently. As the yen continues to weaken, carry trades have been revived rather than withdrawn.

Japanese stocks benefit. The Nikkei rose 1.5% on Monday, as a weaker yen boosted profits for exporters such as Toyota, as overseas revenue returned to the yen. Japanese bank shares are up 40% year to date, reflecting expectations that higher interest rates will boost banks’ profitability.

Safe assets are also on the rise. Silver hit a record high of $67.48 per ounce, bringing year-to-date gains to 134%. The price of gold remains strong at $4,362 per ounce.

However, this comfort rests on shaky foundations. It is an “uncertain calm” resulting from the absence of clear policy guidance from the Bank of Japan. If the Japanese authorities intervene in the currency market or the Bank of Japan accelerates the increase in interest rates faster than expected, the yen could increase significantly. This will quickly clear the cargo trade, which could drag global assets lower.

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The precedent is still new. In August 2024, when the Bank of Japan raised interest rates without an explicit signal before, the Nikkei fell 12% in one day, and Bitcoin fell with it. The price of Bitcoin fell by 20-31% after each of the last three increases of the Bank of Japan.

Expectation: 160 yen is the line in the sand

In the near term, markets expect the dollar and yen to end the year at 155 yen, with lower trading over the Christmas holidays limiting volatility.

However, if the pair breaks above 158 yen, it could test the year’s high of 158.88 yen and then last year’s peak of 161.96 yen. The probability of Japanese intervention increases sharply as the rate approaches 160 yen.

Expectations for the next increase in interest rates from the Bank of Japan are divided. Ingesting Bank expects a move in October 2026, while Bank of America sees June as more likely – and does not rule out April if the yen weakens rapidly. Bank of Ireland analysts expect the final interest rate to reach 1.5% by the end of 2027.

However, some analysts warn that even these predictions may not be enough. With US interest rates still above 3.5% and the Bank of Japan at just 0.75%, the interest rate gap remains too wide for the yen to recover significantly. To stop the decline of the yen, the Bank of Japan needs to raise interest rates to at least 1.25-1.5%, along with more rate cuts from the Federal Reserve – a scenario that seems unlikely in the short term.

Japan is on a tightrope between currency devaluation and debt crisis. “The political consensus to unify funding does not yet exist. The deterioration of the yen will have to get worse before that happens,” Brooks warned.

Global markets should be vigilant against Japan-led volatility in the coming months.