Japan’s Rising Bond Yields and Yen Carry Trade Risk: Why Oil Prices, Fiscal Policy and Global Markets Are Connected

Table of Contents

Key Points

・Japan’s long-term bond yields have risen sharply as markets watch inflation, oil prices, BOJ policy normalization and fiscal policy risks.

・The yen carry trade remains important because Japan’s long period of low interest rates helped fund investment into higher-yielding global assets.

・If Japan’s higher yields, currency volatility and hedging costs reduce expected returns, the pressure to unwind yen-funded positions could affect U.S. Treasuries, equities, emerging markets and the yen.

News / What Happened

Japan’s government bond market is drawing renewed global attention as long-term and super-long yields rise. The benchmark 10-year Japanese government bond yield touched around 2.8% in May 2026, a level last seen in the late 1990s. Super-long maturities have also come under pressure as investors reassess inflation, fiscal policy and the Bank of Japan’s path toward policy normalization.

The backdrop is broader than Japan alone. Middle East tensions and oil-price volatility have added to global inflation concerns, while major bond markets continue to reflect worries over fiscal deficits, central bank policy and long-term debt sustainability. In Japan, higher energy costs have increased pressure for measures to support households facing gasoline and utility bills. Reuters has reported that Japan has been considering a supplementary budget to cushion households from energy inflation, a move that could add pressure to public finances.

The Bank of Japan kept its short-term policy rate at 0.75% at its April 2026 meeting, while some policymakers called for a hike to 1.0%. Markets have also been watching whether the BOJ may move again as inflation pressures persist and the yen remains vulnerable.

This is why the yen carry trade is back in focus. The yen has long been used as a funding currency because Japan kept interest rates extremely low for decades. Investors borrowed yen and used the proceeds to buy higher-yielding currencies, bonds, equities and other overseas assets. If Japan’s rate environment changes, the economics of those trades may also change.

Background

What the yen carry trade is

The yen carry trade is a strategy in which investors borrow yen at low interest rates and use the money to invest in higher-yielding currencies or assets. Reuters describes it as borrowing a low-yielding currency such as the yen and using it to buy currencies with better yields, including assets such as bonds or other money market instruments.

The trade tends to work best when three conditions hold at the same time: Japan’s funding costs are low, overseas yields are attractive, and currency volatility is limited. If the yen weakens, the trade becomes even more attractive because the borrowed yen becomes cheaper to repay in foreign-currency terms.

This is why the yen has played such an important role in global markets. Japan’s ultra-low interest rate environment allowed the yen to become a funding currency for investment flows into U.S. dollar assets, higher-yielding currencies, emerging markets and global risk assets.

Why Japan’s bond yields matter globally

Japan’s rising long-term yields do not automatically mean that the direct cost of every yen-funded trade rises immediately. The more direct funding cost is linked to short-term rates, BOJ policy expectations and money-market conditions.

However, higher long-term yields send an important signal. They suggest that markets are pricing in a different future for Japan: less extreme monetary easing, higher inflation pressure, a more active bond market and potentially higher yen funding costs over time.

The BOJ has also been reducing the planned amount of its monthly Japanese government bond purchases as part of policy normalization. The central bank’s June 2025 policy statement said monthly JGB purchases would be reduced so that they reach about 2 trillion yen in January-March 2027.

When the largest buyer in the market steps back, investors demand a clearer return for holding government debt. That can push yields higher and make Japan’s bond market more sensitive to fiscal policy, inflation and global risk sentiment.

Why oil prices and fiscal policy matter

Higher oil prices matter more for Japan than for many other advanced economies because Japan is a major energy importer. When oil prices rise, fuel, electricity and gas costs increase, and that can feed into broader inflation expectations.

This creates a difficult policy mix. On one side, higher energy prices can push the Bank of Japan toward tighter policy. On the other side, they push the government toward fiscal support, such as fuel subsidies, utility relief, supplementary budgets or politically attractive tax cuts.

That tension is now central to the bond market. Markets are not only watching whether the government supports households. They are also watching how that support is financed. If spending is funded by new debt, investors may demand higher yields to absorb additional bond issuance.

Analysis

Oil prices, inflation and Japan’s policy dilemma

Oil prices link several parts of Japan’s current problem. Higher energy costs raise import prices, squeeze households and increase business costs. They also make it harder for the BOJ to argue that inflation pressure is fading.

If the BOJ keeps policy too loose while import prices remain high, the yen may stay under pressure and inflation may remain sticky. If the BOJ tightens too quickly, it risks putting more pressure on government debt, households with variable-rate loans and financial institutions holding long-duration bonds.

This is the dilemma. Japan needs to normalize policy after decades of ultra-low rates, but normalization is occurring at a time when energy prices, public debt and political pressure for household support are all moving in the same direction.

Fiscal support and bond market discipline

Consumption tax cuts and energy subsidies are politically understandable during a cost-of-living squeeze. They are easy for households to understand and can quickly reduce visible pressure from prices.

The difficulty is that broad tax cuts and subsidies can also support demand at a time when inflation is already a concern. If markets believe fiscal support will require additional bond issuance, long-term and super-long yields can rise further.

The United Kingdom’s 2022 “Truss shock” is a useful comparison, though Japan’s structure is different. In the U.K., a large unfunded tax-cut plan triggered a bond selloff, currency weakness and financial market stress. Japan has a different investor base, a much larger role for its central bank in the bond market and a different domestic savings structure. Still, the lesson is relevant: in an inflationary environment, bond markets judge fiscal policy quickly.

For Japan, the question is not whether household support is necessary. The question is whether the government can deliver support while preserving confidence in fiscal sustainability.

Why yen weakness and unwind risks can coexist

Yen weakness does not contradict concerns about a future yen carry trade unwind. In fact, yen weakness can indicate that yen-funded trades remain attractive or have continued to accumulate.

When the yen is weak and funding costs are low, investors can earn returns from both yield differentials and currency trends. But the more these positions build up, the more sensitive they can become to a change in conditions.

A future shift could come from higher BOJ policy expectations, a sharp yen rebound, rising hedging costs, weaker overseas asset prices or lower risk appetite. Reuters reported in 2024 that an estimated $500 billion yen-funded carry trade unwind was only about halfway complete at that time, showing how large and market-moving these positions can become when volatility rises.

The key issue is expected return. If the yield advantage of overseas assets is eroded by funding costs, currency risk, hedging costs or asset-price losses, investors have less reason to keep yen-funded positions open.

Japanese investors, JGB prices and capital repatriation

Japan’s rising yields affect more than hedge funds and short-term currency trades. They also matter for Japanese institutional investors such as life insurers, banks and pension funds.

For years, low domestic yields encouraged Japanese investors to seek returns overseas. U.S. Treasuries, foreign bonds and global equities became important destinations for Japanese capital.

If domestic yields rise, the incentive to take foreign-exchange risk may weaken. A Japanese investor who can earn a better yield at home may have less need to buy overseas bonds, especially if currency hedging is expensive.

At the same time, rising yields mean falling bond prices. Banks and insurers holding existing Japanese government bonds may face valuation losses on older low-yielding securities. That makes the adjustment more complex. Higher yields can make new JGB purchases more attractive, but they can also create balance-sheet pressure on existing holdings.

This is why Japan’s yield rise is not a simple story of “money returning home.” It is a shift in the risk-return calculation across domestic bonds, overseas assets, currency exposure and balance-sheet management.

U.S. Treasuries and global risk assets

Japan is one of the world’s major holders of U.S. Treasuries. If Japanese investors reduce demand for U.S. bonds because domestic yields become more attractive or hedged U.S. Treasury returns become less appealing, U.S. yields could face additional upward pressure.

That matters because U.S. Treasury yields are a benchmark for global asset pricing. Higher U.S. yields can pressure equity valuations, especially for growth and technology stocks. They can also tighten financial conditions for emerging markets and reduce global risk appetite.

A yen carry trade unwind would therefore not be only a currency-market issue. It could involve overseas asset sales, yen buying, weaker demand for foreign bonds and pressure on global equities.

Japan’s bond market is once again becoming a channel through which domestic policy, global capital flows and international risk assets are connected.

Conclusion

Japan’s rising long-term yields are important because they challenge assumptions that shaped global markets for decades. Ultra-low Japanese rates supported cheap yen funding, encouraged overseas investment and helped make Japan a quiet but powerful source of global liquidity.

That environment is changing. Higher oil prices are adding inflation pressure. The BOJ is moving gradually toward policy normalization. Fiscal support remains politically difficult to avoid, but markets are watching how it will be financed. Japanese institutions are reassessing the balance between domestic and foreign assets. Investors using yen funding are watching whether expected returns still justify the risk.

The yen carry trade is a symbol of this broader shift. The concern is not simply that the yen may rise or stocks may fall. The larger issue is that the financial logic built around Japan’s low-rate era may become less stable as yields rise.

For households, this can still feel distant. But the same forces affect mortgage rates, import prices, savings returns, pension assets, stock market volatility and government debt costs. Japan’s move from ultra-low rates toward a higher-rate environment is no longer only a domestic policy story. It is becoming one of the key questions for global markets.

Japan’s Rising Bond Yields and Yen Carry Trade Risk: Why Oil Prices, Fiscal Policy and Global Markets Are Connected

Key Points

News / What Happened