On March 30, the Bank of Japan released the "Summary of Opinions" from its monetary policy meeting of March 18 and 19. With oil prices surging after the US-Israeli operation against Iran and the Strait of Hormuz effectively blockaded, board members delivered a hawkish message: rate hikes must continue, geopolitical crisis or not. With the policy rate at 0.75% and the neutral rate estimated at 1.1–2.5%, the question was not whether Japan would hike again, but how fast. What follows was written just after the Summary appeared. How it played out is in the final section.

What the "Summary of Opinions" Reveals: Hawks Dominate Despite Middle East Turmoil

The BOJ kept its policy rate unchanged at 0.75% at the March meeting. But the Summary of Opinions tells a different story from the hold decision, the overwhelming majority of board members see the rate hike cycle as far from over.

One board member stated bluntly that if economic conditions and small-business wage growth don't collapse, the BOJ should "proceed with rate hikes without hesitation." This member also warned that underlying inflation must not be allowed to persistently exceed 2%, signaling a strong bias toward preemptive tightening.

Another member argued that the BOJ should "consider adjusting the degree of monetary accommodation without leaving long intervals," citing sustained wage growth and robust corporate investment appetite. Perhaps most strikingly, one member raised the issue of "behind the curve" risk, the danger that if the BOJ delays too long, it will eventually be forced into much steeper rate increases. This member explicitly proposed examining "the pace of rate hikes, including the size of hikes", a hint at the possibility of larger-than-usual 50-basis-point moves.

"Behind the curve" is central banker language for falling dangerously behind inflation. When a BOJ member uses this phrase in an official document, it carries weight.

The Oil Shock: Why This Time Could Be Worse Than 2022

The most heated discussion at the March meeting centered on how surging oil prices could accelerate inflation beyond the BOJ's baseline scenario.

Japan imports approximately 94% of its oil from the Middle East, and about 80% of the tankers carrying that oil pass through the Strait of Hormuz. Since the US-Israeli military operations against Iran began on February 28, Iran's Revolutionary Guard Corps has restricted navigation through the strait, creating a de facto blockade. Brent crude, which closed around $72 a barrel on February 27, the day before the strikes, climbed to nearly $120 at its peak, rising 51% over the month of March, one of the largest monthly surges on record.

One board member pointed out that Japan's LNG imports are largely priced based on Middle Eastern crude oil benchmarks, meaning soaring oil prices would drive up not just gasoline and plastics but also electricity and gas bills across the board. The Japanese government launched emergency fuel subsidies on March 19, aiming to hold gasoline prices at around ¥170 per liter (about $4.30 per gallon), but the national average had already reached ¥190.8 before the intervention.

The critical concern is what economists call "second-round effects." One member warned that with inflation expectations already near 2%, companies actively raising prices, and labor supply constraints persisting, "there is a risk that oil price surges and yen depreciation could continuously and significantly push up inflation." In other words, a temporary oil price spike could morph into entrenched inflation through the feedback loop of price increases, wage demands, and further price hikes.

Critically, another member compared the current situation to the aftermath of Russia's invasion of Ukraine in 2022 and concluded that "the degree of caution warranted, both for prices and growth, is higher than it was then." The reasoning: Japan's economy has fundamentally changed since 2022. Companies are now more willing to pass on costs, workers are demanding higher wages, and inflation expectations have shifted upward. This makes the economy more vulnerable to external shocks becoming embedded in the price level.

The Acceleration Scenario: Beyond Neutral to Active Tightening

The most forward-looking statement in the Summary of Opinions was a member's suggestion that the BOJ may need to accelerate its rate hike pace, potentially moving monetary conditions from accommodative through neutral and into outright tightening territory.

This member stated: "If Middle East tensions become prolonged, while maintaining the gradual pace of rate hikes as the central option, it would be appropriate to also pay attention to whether it may be necessary to accelerate rate hikes beyond the previous assumptions and bring financial conditions to neutral or even restrictive."

On March 27, the BOJ published a re-estimate of the natural rate of interest, the real rate that is neutral for the economy and prices. Six models put it between roughly minus 0.9% and plus 0.5%. Adding the 2% inflation target gives a nominal neutral rate of 1.1% to 2.5%, with the lower bound up 0.1 points from the previous 1.0% to 2.5%. With the policy rate at 0.75%, there is substantial room to hike before even reaching the lower end of neutral: a single 0.25-point move would bring it to 1.0%, still short. The implication is clear: the BOJ is nowhere near done.

Another member went further, noting that if excessive yen depreciation deepens cost-push pressures, or if second-round effects from oil prices accelerate wage growth, "monetary tightening may become necessary." This represents language that goes beyond the BOJ's usual "adjustment of accommodation" framing, it explicitly puts contractionary policy on the table.

Spring Wage Negotiations: The 5.26% Tailwind

Supporting the case for rate hikes is the strong result from Japan's 2026 Shunto spring wage negotiations. The Japanese Trade Union Confederation (Rengo) reported a 5.26% wage increase in its first tally on March 23, the third consecutive year above 5%. Major companies offered full or near-full acceptance of union demands, reinforcing the BOJ's view that the "virtuous cycle" of wages and prices is taking hold.

The Summary of Opinions reflected this, noting that "many large companies responded to union demands at or near full levels, suggesting that solid wage increases are likely across a broad range of companies this year." However, there was a note of caution about smaller firms: one member said they would continue monitoring how wage growth filters down to small and medium-sized enterprises, especially given the economic headwinds from the Middle East situation.

Shunto, literally "spring offensive", is Japan's annual synchronized wage negotiation season. Unlike individualized bargaining in most Western economies, Japanese companies negotiate wages in a concentrated period each spring, and the results set the tone for the entire year's wage growth. This is why the BOJ watches Shunto results so closely: they serve as a real-time gauge of whether wage-price dynamics are shifting.

Global Central Bank Comparison: Everyone Is Turning Hawkish

The BOJ's stance must be understood in the context of a global shift toward hawkishness driven by the oil shock.

The US Federal Reserve held its policy rate at 3.50–3.75% at the March 17–18 FOMC meeting. Chair Powell stated that rate cuts would not proceed without clear progress on inflation. Markets have fully priced out any additional rate cuts in 2026 and briefly assigned a 50% probability to a Fed rate hike by October. The FOMC's updated projections raised the 2026 PCE inflation forecast to 2.7%.

The European Central Bank also held its deposit rate at 2.0% on March 19, marking six consecutive meetings of no change. President Lagarde warned that "inflation risks are tilted to the upside" and presented an additional scenario in which oil-driven inflation could push the Harmonized Index to 4.8%. Markets are beginning to price in an ECB rate hike as early as April.

As one BOJ member noted in the Summary of Opinions: "In Europe and many other countries, the lesson of being criticized for looking through inflation in 2022 has led to the emergence of rate hike expectations, creating an environment where yen depreciation pressure is likely."

The message is straightforward: if every other major central bank tightens while the BOJ stands still, the interest rate differential widens, and the yen weakens further. The dollar-yen rate has already fallen to ¥160, its weakest in about 20 months, while Japan's 10-year government bond yield has climbed to 2.385%, the highest in roughly 27 years.

Yen Carry Trade Unwind Risk

If the BOJ accelerates its rate hikes, one of the most significant transmission channels to global markets would be an unwinding of the yen carry trade.

The carry trade works like this: investors borrow in low-yielding yen and invest the proceeds in higher-yielding assets, US Treasuries, emerging market bonds, or even stocks. Japan's prolonged ultra-low rates made this one of the most popular trades in global finance, with estimates of outstanding carry positions running into hundreds of billions of dollars.

When BOJ rate hikes push up yen borrowing costs and raise expectations of yen appreciation, carry traders can rush to close positions simultaneously, triggering a cascade: yen buying, foreign asset selling, and volatility spikes across markets. This played out in July–August 2024, when a BOJ rate hike helped spark a partial carry trade unwind and a global equity sell-off.

However, the current situation is complicated by "safe haven" dollar buying driven by the Middle East conflict, which is pushing the yen weaker, not stronger. Even if the BOJ hikes, geopolitical risk premiums may keep the yen under pressure, creating cross-currents that make the market outlook harder to read.

When Is the Next Hike? All Eyes on the April 28 Outlook Report

At that point, the market's primary focus was the BOJ's next meeting on April 27–28, when the bank will simultaneously publish its "Outlook for Economic Activity and Prices" report. If the BOJ revises its inflation forecast upward, which seems likely given the oil shock, it would strengthen the case for a rate hike at that meeting.

The Summary of Opinions provides a roadmap: one member stated it would be "appropriate to examine the spread of wage increases and initial price hikes from the new fiscal year, while confirming that financial conditions remain accommodative even after the previous rate hike." This suggests the BOJ is building a checklist for an April move.

Key data points to watch include the BOJ Tankan business survey scheduled for April 1, which will show how oil prices are affecting corporate sentiment, followed by the BOJ's branch managers' meeting in early April, which provides grassroots intelligence on regional economies and small-business wage trends, and monthly labor statistics from April onward, which will reveal whether real wages are sustainably positive.

Some economists are already forecasting a rate hike at the April meeting. Even if the BOJ holds in April, the hawkish tone of the March Summary of Opinions makes a June or July hike virtually certain.

The BOJ Was Ready to Move

The message from the March Summary of Opinions was clear. The board was not backing away from rate hikes despite the biggest geopolitical shock in years. If anything, the oil crisis strengthened the case for tightening by amplifying inflation risks.

History loomed large. In the 1970s oil crisis, central banks that waited too long allowed stagflation to take root. The BOJ looked determined not to repeat it.

What actually happened. A temporary ceasefire reported on April 8 took the edge off oil prices, and expectations for an April hike collapsed. The BOJ left the policy rate at 0.75% on April 27 and 28, a third consecutive hold. For all the hawkishness in the Summary, it did not move.

The hike came at the June 15–16 meeting instead, taking the rate to 1.0%, the first increase since December 2025. The market read at the time, that even if April passed, a June or July hike was close to certain, turned out to be right. It was an unusual session: Governor Ueda was hospitalized and Deputy Governor Ryozo Himino chaired. Seven of the eight members present voted in favor. The lone dissenter, board member Asada, was widely read as reflecting Prime Minister Takaichi's preferences, leaving the question of the distance between government and central bank unresolved.

In Japan, people are grappling with the combined pressure of a Middle East crisis, rising prices, and higher interest rates. How is the oil price surge affecting your country? Are central banks in your region also leaning toward rate hikes? We'd love to hear your perspective.

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