Japan Urges More BOJ Bond Purchases as Rising Yields Challenge Yen Support

Japan Seeks Greater Flexibility From the BOJ

Japanese Prime Minister Sanae Takaichi reportedly asked Bank of Japan Governor Kazuo Ueda to increase government-bond purchases when necessary to contain sharp rises in long-term interest rates.

According to a report published by Jiji Press and cited by Reuters, the request was made during a meeting in May. Takaichi emphasised the importance of maintaining financial-market stability as Japanese government bond yields moved higher.

Ueda reportedly acknowledged the government’s concerns but stressed that any central-bank response would need to consider market conditions. The discussion highlights the increasingly difficult relationship between fiscal policy, monetary normalisation and currency stability.

The request does not necessarily mean the BOJ will permanently reverse its bond-buying reduction plan. However, it reinforces the possibility that additional BOJ bond purchases could be used when yields rise too quickly or market liquidity deteriorates.

Japan wants to prevent a disorderly increase in government borrowing costs, but greater BOJ intervention in the bond market could weaken the same yen that authorities recently acted to support.

Why Rising JGB Yields Matter

Japanese government bond yields influence borrowing costs across the economy. They affect government financing, corporate debt, mortgages, bank portfolios and the relative attractiveness of Japanese assets.

Higher yields can be a natural consequence of rising inflation and expectations that the BOJ will continue normalising monetary policy. However, a rapid or disorderly increase may create wider financial risks.

Japan’s large public debt makes the economy particularly sensitive to changes in long-term interest rates. Although much of that debt is held domestically and the increase in servicing costs occurs gradually, persistently higher yields can increase pressure on future government budgets.

Rising JGB yields may affect markets through several channels:

• Government financing costs can increase as bonds mature and are refinanced.
• Banks may experience valuation losses on existing bond holdings.
• Companies may face more expensive borrowing conditions.
• Higher yields may pressure equity valuations.
• Japanese investors may become more willing to keep capital at home.
• Global bond markets may be affected if Japanese institutions reduce overseas holdings.

Additional BOJ bond purchases could help limit these risks by increasing demand for government securities. Nevertheless, greater intervention may also reduce the role of market forces in determining yields.

The BOJ Has Slowed Its Bond-Buying Reduction

The BOJ began reducing its government-bond purchases in July 2024 as part of a gradual effort to withdraw extraordinary monetary support and improve price discovery in the JGB market.

Under its latest plan, the central bank is reducing its monthly purchases by approximately JPY 200 billion each calendar quarter until the first quarter of 2027.

The scheduled monthly purchase amounts are approximately:

• July–September 2026: JPY 2.5 trillion.
• October–December 2026: JPY 2.3 trillion.
• January–March 2027: JPY 2.1 trillion.
• From April 2027 onward: JPY 2 trillion per month.

The BOJ decided in June to stop reducing purchases once they reach approximately JPY 2 trillion per month. This means it will continue maintaining a substantial presence in the government-bond market even after the current reduction phase ends.

The plan also gives the central bank flexibility to respond to a rapid increase in long-term rates. Possible measures include increasing BOJ bond purchases or conducting fixed-rate purchase operations outside its normal monthly schedule.

A recent BOJ research paper concluded that the reduction in purchases had produced only a limited increase in long-term rates. However, the effect may become more significant if private investors do not absorb the supply previously purchased by the central bank.

Bond Purchases Could Complicate Yen Support

The request for greater BOJ intervention comes shortly after Japan and the United States conducted a rare coordinated operation to buy the yen.

The intervention followed a decline that took the Japanese currency close to JPY 164 against the US dollar, its weakest level in approximately 40 years. USDJPY subsequently moved back toward the 157–158 area as intervention and the threat of further action discouraged some speculative selling.

The two policies may appear to pursue conflicting objectives.

Additional BOJ bond purchases can restrain yields and loosen financial conditions. However, lower Japanese yields may reduce the return available on yen-denominated assets relative to US dollar assets and other foreign investments. That interest-rate disadvantage can encourage investors to sell yen.

Yen-buying intervention attempts to achieve the opposite result by creating demand for the currency.

The policy tension can be summarised as follows:

1. Rising JGB yields increase government and private-sector borrowing costs.
2. The BOJ may increase bond purchases to contain those yields.
3. Greater bond purchases can reduce the relative attractiveness of Japanese assets.
4. Lower relative returns may place renewed pressure on the yen.
5. A weaker yen can raise import costs and inflation.
6. Authorities may then need further currency intervention or tighter monetary policy.

This does not mean BOJ bond purchases will automatically cause USDJPY to rise. Currency movements also depend on US interest rates, global risk sentiment and expectations for future BOJ rate increases.

Coordinated Intervention Raises the Stakes for USDJPY

The recent operation was the first coordinated US-Japan intervention of its kind since 2011. Its significance extended beyond the amount of currency purchased because it demonstrated that Washington was prepared to support Tokyo’s effort to stabilise the yen.

Coordinated intervention can be more effective than unilateral action because it signals that multiple governments view the currency movement as disorderly or economically damaging.

A former BOJ official told Reuters that Japan and the United States could intervene again if the yen resumes its decline. The warning may discourage traders from aggressively rebuilding short-yen positions, particularly as USDJPY approaches recent intervention levels.

Important reference areas now include:

• JPY 155–158: The range where the yen stabilised after intervention.
• JPY 160: A psychologically important level that may attract greater official scrutiny.
• JPY 163.99: The recent 40-year low for the yen.
• JPY 155.20: A recent three-month high reached after the intervention-driven recovery.

These levels are not guaranteed intervention triggers. Japanese authorities generally focus on the speed and disorderliness of exchange-rate movements rather than defending a formally announced price.

Inflation Adds Another Layer to the Policy Conflict

A weak yen increases the cost of imported fuel, food and raw materials. This can reinforce inflation even when domestic demand remains moderate.

Higher import costs reduce household purchasing power and increase operating expenses for companies dependent on overseas supplies. Persistent yen weakness can therefore make it more difficult for the BOJ to maintain stable inflation without further interest-rate increases.

At the same time, higher rates and rising bond yields can place pressure on government finances and interest-rate-sensitive sectors. The BOJ must therefore balance several competing objectives:

• Allowing yields to reflect economic conditions.
• Preventing disorderly disruption in the JGB market.
• Supporting sustainable inflation near its target.
• Avoiding excessive yen depreciation.
• Limiting financial pressure on households and businesses.
• Preserving confidence in the independence of monetary policy.

If the BOJ uses bond purchases to suppress yields while inflation remains elevated, investors may interpret the policy as more accommodative. Conversely, a rate increase combined with flexible bond operations could allow the central bank to tighten short-term policy while preventing instability at the longer end of the yield curve.

Implications for Japanese Equities

The consequences for Japanese equities are mixed because different sectors respond differently to yields and currency movements.

Lower long-term yields can support equity valuations by reducing the discount rate applied to future earnings. BOJ bond purchases may therefore benefit growth-oriented companies and highly leveraged businesses.

A weaker yen can also improve the translated value of overseas revenue earned by Japanese exporters. Automakers, industrial manufacturers and technology companies may benefit when foreign earnings are converted into yen.

However, these advantages come with risks:

• Banks may receive less support from widening interest margins if yields are restrained.
• Import-dependent businesses may face higher costs when the yen weakens.
• Retailers may experience pressure if inflation reduces household purchasing power.
• Property companies can benefit from lower yields but remain sensitive to policy uncertainty.
• Exporters may face greater volatility if authorities repeatedly intervene in the currency market.

The Nikkei 225 may initially welcome lower bond yields, but sustained yen weakness and rising imported inflation could eventually reduce the benefit.

What Traders Should Monitor Next

The outlook for BOJ policy, JGB yields and USDJPY will depend on whether the government’s request leads to an observable change in central-bank operations.

Traders should monitor:

• Unscheduled BOJ bond-purchase announcements.
• Fixed-rate JGB purchase operations.
• Changes in Japan’s 10-year and longer-dated government-bond yields.
• Comments from Prime Minister Takaichi and BOJ Governor Ueda.
• Guidance surrounding the BOJ’s September policy meeting.
• Japanese inflation and wage-growth data.
• USDJPY movements near recent intervention levels.
• Statements from Japan’s Ministry of Finance and the US Treasury.
• Federal Reserve rate expectations and US Treasury yields.
• Foreign demand at Japanese government-bond auctions.

The relationship between JGB yields and USDJPY will be particularly important. If yields rise because markets expect tighter BOJ policy, the yen may receive support. If yields rise primarily because of fiscal concerns, the currency response may be less positive.

Similarly, BOJ bond purchases announced as a temporary response to disorderly markets may have a smaller currency impact than a broader reversal of monetary normalisation.

Market Outlook

Japan’s latest policy discussion reveals a difficult conflict between controlling borrowing costs and supporting the yen.

Additional BOJ bond purchases could stabilise the JGB market and prevent a disorderly increase in long-term rates. This may support government financing conditions and provide short-term relief to rate-sensitive areas of the equity market.

However, suppressing yields could weaken the monetary-policy foundation for a stronger yen. If Japanese returns remain low relative to those in the United States, intervention alone may struggle to produce a lasting currency recovery.

For USDJPY, coordinated intervention has created a meaningful risk for traders positioned against the yen. Nevertheless, the longer-term direction will depend on whether the BOJ tightens policy, whether US yields decline and whether Japan’s government avoids policies that reinforce downward pressure on its currency.

The central question is therefore not simply whether the BOJ will buy more bonds. Markets must determine whether those purchases would represent temporary action to maintain orderly trading or a broader shift back toward monetary accommodation.

Until that distinction becomes clearer, USDJPY, Japanese government bonds and the Nikkei 225 may remain highly sensitive to official comments, BOJ operations and signs of renewed yen weakness.

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