Japan's 31-year-high policy rate still sits 275 basis points behind the Fed
Governor Kazuo Ueda's board hiked 25 basis points on a 7-2 vote and the yen still slid toward 158 per dollar, because the Federal Reserve had taken the same 25 basis points two days earlier and left the gap between the two unchanged.
The Investor · Invest desk
What happened
- The Bank of Japan raised its benchmark interest rate by 25 basis points to 1.25 percent on September 18, the highest level since 1995.
- The decision passed by a 7-2 vote, with board members Toichiro Asada and Ayano Sato dissenting.
- The yen fell almost 0.8 percent against the dollar to 157.15 after the decision, which Cryptopolitan attributed to the two dissents and the bank's cautious policy guidance.
- Japan's Silver Week holiday begins shortly after the meeting, pulling Tokyo traders away from their desks and draining liquidity from yen-denominated markets.
- August core inflation had slipped to 1.7 percent from 1.8 percent, still close to the BOJ's 2 percent target.
Why it matters
- What it limits constraint A 31-year-high nominal rate is still about 0.45 points under core inflation, so a yen holder is paid less than the loss of purchasing power and the hike offers no real yield to chase.
- Who has to decide decision The yen is about 1.8 percent from the 160 level Cryptobriefing says could force the Ministry of Finance's hand, so the next decision on the currency belongs to the ministry and its reserves.
- What it costs cost Japanese households carry the weak currency through imported energy and goods, and the price they import at is set by a rate the hike left roughly where it was.
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The Federal Reserve raised its target range to 3.75 to 4 percent two days before the BOJ met, unanimously, and that was the Fed's first increase in more than three years [13][24]. Money borrowed in yen and held in dollars therefore earns this week what it earned last week: both banks moved 25 basis points, which leaves 275 points between the top of the Fed's range and Japan's 1.25 percent, the same gap that stood before either meeting [18][19].
The cadence did move. This increase came three months after the June one, against the roughly six months the BOJ had generally left between hikes in recent years [2][9]. Hold that faster pace and closing 275 basis points at 25 a time takes eleven hikes, or 33 months [20]. The European Central Bank's rate, raised to 2.5 percent at the start of September, is 125 basis points above Japan's [14][22].
The bank's own statement pointed at AI spending as a source of price pressure. It noted, "The increased demand arising from the AI buildout will exert upward pressure on both economic activity and prices. Furthermore, the global market prices of items such as memory chips and copper wiring are rising in reflection of global supply and demand conditions, giving additional upward push to prices in Japan." [16]
Washington had asked for this. US Treasury Secretary Scott Bessent had pressed Ueda to take appropriate monetary policy action to stem the yen's weakening [11], and he said, "I have information that the market doesn't have, and it's my belief that the Japanese government and the BOJ will do the things that will lead to a stronger yen" [12]. Last month's support operation was joint, the first US-Japan intervention of that kind since 2011 [7].
The two accounts of what the last defence cost do not agree. Cryptobriefing puts record-scale Ministry of Finance intervention at roughly 11.7 trillion yen, about $73 billion, during the Golden Week holiday in April and May 2026, with spending over the surrounding month reaching $96.4 billion [25][26]. Cryptopolitan dates about $96.5 billion of yen support to the stretch from late July to late August, after the currency hit a 40-year low [27]. Either way the money came out of the ministry's reserves, and the 25 basis points cost the BOJ nothing. Cryptobriefing's own conversion, 11.7 trillion over 73 billion, works out at about 160 yen to the dollar while that money was going out [23].
Cryptobriefing's reading is that the yen had been strengthening into the meeting on expectations of a signal for faster normalisation, and that Ueda's team delivered the increase without the accompanying rhetoric [6]. There is a duller explanation sitting next to it: the Fed moved the same week and unanimously [13], so part of the slide is the dollar leg. Two tests separate them. If the BOJ hikes again in three months, the complaint about missing momentum ends there. If the ministry defends the 160 level during Silver Week and the yen is back at 160 a week later, the spread is what moves the currency, and 25 basis points did not touch the spread.
What to watch
- Whether the Ministry of Finance intervenes during Silver Week, and at what level it shows up.
- The interval to the next BOJ move: another 25 basis points in three months confirms the faster cadence, a pause restores the six-month clock.
- Official Ministry of Finance data on the timing and size of the yen purchases, which would reconcile the two conflicting intervention accounts.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence55
- Adoption
- Not scored
- Hype gap+15
- Incentives25
- Confidence55
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
The Bank of Japan raised its benchmark interest rate by 25 basis points to 1.25% on September 18, the highest level since 1995.
- [2]
The BOJ raised its benchmark interest rate from 1% to 1.25% on Friday, its first rate hike since June.
- [3]
The decision passed by a 7-2 vote, with board members Toichiro Asada and Ayano Sato dissenting.
- [4]
The currency responded to the decision by sliding toward 158 yen per dollar.
- [5]
The yen fell almost 0.8 percent against the dollar to 157.15 yen following the BOJ decision, as investors were more concerned about the two dissenting votes and the Bank of Japan's cautious policy guidance.
- [6]
The yen had been strengthening in the weeks before the meeting on anticipation that the BOJ would telegraph faster policy normalization; instead Governor Kazuo Ueda's team delivered the rate increase without the accompanying rhetoric.
- [7]
The US stepped in last month to prop up the yen against a 40-year low, the first joint intervention since 2011.
- [8]
Even at 1.25%, Japan's benchmark rate remains well below those of most major economies, which continues to make the yen an attractive funding currency for carry trades; the BOJ's failure to signal faster rate increases told carry traders the interest rate differential is not narrowing as quickly as feared.
- [9]
Until now the BOJ had generally waited six months between hikes in recent years, but the latest increase comes after only three months.
- [10]
Japan's Silver Week holiday begins shortly after the BOJ meeting, pulling Tokyo traders away from their desks and draining liquidity from yen-denominated markets.
- [11]
The US had previously pushed Japan to raise interest rates sooner, and US Treasury Secretary Scott Bessent had asked BOJ Governor Kazuo Ueda to take appropriate monetary policy action to stem the yen's weakening.
- [12]
"I have information that the market doesn't have, and it's my belief that the Japanese government and the BOJ will do the things that will lead to a stronger yen."
- [13]
The Federal Reserve raised its target range from 3.5%-3.75% to 3.75%-4% on Wednesday, its first hike in more than three years, by unanimous decision.
- [14]
The European Central Bank raised its interest rate to 2.5% at the beginning of September.
- [15]
August core inflation in Japan fell slightly to 1.7% from 1.8%, still close to the BOJ's 2% target.
- [16]
"The increased demand arising from the AI buildout will exert upward pressure on both economic activity and prices. Furthermore, the global market prices of items such as memory chips and copper wiring are rising in reflection of global supply and demand conditions, giving additional upward push to prices in Japan."
- [17]
The weak yen matters for Japanese households because Japan relies heavily on imported energy and other goods, and a weaker currency means import costs go up, adding inflationary pressure.
- [18]
The top of the Fed's new 3.75%-4% range is 275 basis points above Japan's 1.25% policy rate.
- [19]
Both central banks raised by 25 basis points in the same week, so the gap between the top of the Fed's range and the BOJ's policy rate is unchanged.
- [20]
Closing a 275 basis point gap in 25 basis point steps takes eleven hikes, or 33 months at the BOJ's new three-month interval.
- [21]
At a 1.25% policy rate against August core inflation of 1.7%, the policy rate is about 0.45 percentage points below core inflation.
- [22]
The ECB's 2.5% rate is 125 basis points above Japan's 1.25%.
- [23]
Cryptobriefing's own conversion of the Golden Week intervention implies about 160 yen to the dollar.
- [24]
The Fed acted on Wednesday and the BOJ on Friday, two days later.
- [25]
During the Golden Week holiday in April-May 2026, the Ministry of Finance conducted record-scale interventions totalling roughly 11.7 trillion yen, approximately $73 billion, to prop up the yen.
- [26]
Total spending over the month surrounding the Golden Week interventions reached $96.4 billion equivalent.
- [27]
Japanese authorities spent about $96.5 billion to support the currency from late July to late August, after the yen fell to a 40-year low.
- [28]
The 158 yen level is already uncomfortable territory, and a move toward 160 during holiday-thinned trading could force the Ministry of Finance's hand.
- [29]
From 157.15 yen per dollar, the currency needs to weaken about 1.8 percent to reach 160.
Sources
2 independent publishers whose own reporting we read for this story.
- cryptobriefing.comYen faces vulnerability as Japan’s holiday thins trading liquidity
1 article · September 20, 2026
- cryptopolitan.comBOJ raises rates to a 31-year high as AI demand adds to inflation risks
1 article · September 18, 2026
Topics and entities
Topics
- Japanese Yen
- Currency Intervention
- Central bank interest rates