For decades, Japan was one of the clearest examples of an economy trapped in very low interest rates, weak inflation and deflationary pressures. That model is now changing rapidly. Inflation has returned, the Bank of Japan is raising interest rates and Japanese government bond yields have reached levels unseen in decades.
The change is important not only for Japan. The country is one of the world’s largest holders of foreign financial assets, meaning that changes in Japanese interest rates can affect the United States, Europe and global financial markets.
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Why the 3% yield on Japanese bonds matters
On September 1, Japan’s 10-year government bond yield reached 3%, its highest level since 1996. By September 29, it had moved above 3.1%, showing that the upward pressure on Japanese borrowing costs has not disappeared. The significance goes beyond the number itself. For years, Japanese investors had strong incentives to invest abroad because domestic interest rates were extremely low. Japan accumulated huge holdings of foreign bonds and equities, including around dollars 1.1 trillion in US Treasury securities.
Higher returns on Japanese government bonds could gradually make domestic assets more attractive. This creates the possibility of some capital being brought back to Japan, reducing demand for foreign assets.
However, this does not mean that Japanese investors are suddenly going to sell their US or European holdings. The available evidence points instead to a gradual adjustment of international portfolios. The size and speed of any repatriation will depend on how high Japanese interest rates ultimately go and how investors assess the future path of the yen.
This is why the 3% threshold has attracted so much attention. It represents a potential change in the global flow of capital rather than simply a move in one country’s bond market.
Takaichi’s new economic policy
The change in monetary policy is taking place alongside a significant shift in Japan’s economic strategy under Prime Minister Sanae Takaichi. The government has presented what it describes as a responsible and proactive fiscal policy, combining higher public investment with targeted support for strategic industries. Artificial intelligence, semiconductors and space technology are among the sectors identified as priorities.
Tokyo has outlined plans for more than 370 trillion yen in public and private investment through fiscal year 2040, while setting an ambitious target of bringing nominal GDP close to 1,100 trillion yen. The strategy is based on the idea that public spending can stimulate investment and strengthen Japan’s productive capacity. But it also creates a difficult balance for policymakers.
Japan already has one of the highest public-debt ratios among advanced economies, with government debt exceeding 200% of GDP. At the same time, higher interest rates mean that servicing this debt becomes increasingly expensive.
Budget requests for the next fiscal year have reached around 143 trillion yen, highlighting the scale of the government’s spending plans. The central challenge is therefore to support economic growth without allowing fiscal expansion, inflation and borrowing costs to reinforce one another.
The Bank of Japan is changing direction
The Bank of Japan (BoJ) is also moving away from the extraordinary monetary policies that defined much of the past decade. On September 18, the central bank raised its policy rate from 1% to 1.25%, the highest level in more than three decades. The decision passed by a 7-2 vote.
The increase came after inflation remained close to the central bank’s target and concerns about price pressures continued to build. Minutes from the BoJ’s July meeting showed that several policymakers were already considering the possibility of faster rate increases.
The next monetary policy meeting is scheduled for October 29-30. Investors will therefore be watching closely for indications of whether the BoJ intends to continue raising rates and, above all, how quickly it wants to proceed. A faster tightening cycle would further increase the attractiveness of Japanese bonds, but it could also put additional pressure on the government’s finances.
A weak yen despite higher interest rates
One of the most striking aspects of the current situation is that the yen remains weak even as Japanese interest rates rise. On September 29, the Japanese currency was trading at around 157 yen per US dollar. Against the euro, the European Central Bank’s September 28 reference rate was approximately 178.5 yen per euro.
Normally, higher interest rates can support a country’s currency by making its assets more attractive to international investors. In Japan’s case, however, the effect has been limited. Investors continue to consider the large interest-rate gap between Japan and other major economies, while expectations surrounding future BoJ decisions and Japan’s fiscal policy remain important.
The weak yen also creates a problem for Japanese consumers and businesses because Japan relies heavily on imports of energy and raw materials. A weaker currency makes these products more expensive in yen terms and can therefore add to inflation.
Japanese and US officials have also increased their warnings about excessive currency movements. Tokyo has made clear that it remains prepared to intervene if necessary to prevent disorderly moves in the foreign-exchange market.
Why Japan matters to the US and Europe
Japan’s economic transformation matters because the country has long played an important role as a source of relatively cheap capital for global markets.
When Japanese interest rates were close to zero, investors had strong incentives to seek higher returns abroad. The yen also became one of the main funding currencies for so-called carry trades, in which investors borrow in a low-interest-rate currency and invest in assets offering higher returns elsewhere. A structurally higher Japanese interest-rate environment could gradually change that mechanism.
Japanese investors may find domestic government bonds more attractive, while international investors may become less willing to use the yen as a cheap funding currency. At the same time, higher Japanese bond yields could compete more directly with US Treasuries and European government bonds.
This does not automatically mean that Japan will withdraw from international markets. The country’s overseas investments are enormous and remain an important component of its financial system. The more realistic possibility is a gradual rebalancing of global portfolios, with a larger share of Japanese capital potentially remaining at home.
What could happen in the coming months
The direction of Japan’s economy will depend on how monetary tightening and fiscal expansion interact. In one scenario, higher public investment could strengthen productivity and economic growth, particularly in strategic sectors such as AI and semiconductors. If inflation gradually returns toward the BoJ’s target, the central bank could continue normalising interest rates at a controlled pace.
A second possibility is that inflation and yen weakness remain persistent. In that case, the BoJ could face pressure to raise rates more quickly. Higher borrowing costs would increase the government’s debt-servicing burden and could create greater tension between fiscal and monetary policy.
A third, intermediate scenario would involve structurally higher Japanese interest rates without a massive repatriation of overseas capital. Japanese investors could continue to hold substantial foreign assets while gradually increasing their exposure to domestic bonds.
For global markets, the key point is that Japan is no longer the same ultra-low-rate economy it was for decades. The 3% yield on the 10-year government bond is therefore more than a financial-market milestone: it is a visible sign of a broader transformation in Japan’s economic model and in its relationship with international capital markets.
