Background: why was Japan’s rate near zero in the first place?
For context most readers won’t have: Japan spent roughly three decades — from the early 1990s until 2024 — with near-zero or negative interest rates, a policy response to chronic deflation following its asset price bubble collapse. This made the Bank of Japan (BOJ) a global outlier; while the US Federal Reserve and European Central Bank were raising rates aggressively after 2022, the BOJ held firm. That changed in 2024, when the BOJ began what analysts call policy normalisation — a gradual, deliberate exit from ultra-loose monetary policy as inflation finally became persistent rather than transient.
What just happened
On 16 June 2026, Japan’s central bank raised its policy rate to 1%, the highest level in over 30 years, in line with economist expectations polled by Reuters. This was the BOJ’s first hike since December 2025, when it raised rates to 0.75%, and the first time since 1995 that the rate has reached 1%. The decision to raise rates by 25 basis points was split 7-1, with board member Toichiro Asada dissenting in favour of a hold. A basis point is one-hundredth of a percentage point — so a “25 basis point hike” means a 0.25 percentage point increase, the standard increment central banks use to fine-tune policy. Bitcoin Foundation + 2
This wasn’t a straightforward move. As recently as 28 April 2026, the BOJ had kept rates steady at 0.75% in a split 6-3 vote, even as it cut its fiscal year 2026 growth forecast from 1% to 0.5% and raised its core inflation forecast from 1.9% to 2.8%, citing the Iran war’s effect on supply-side risk. Elliptic
The yen problem
A second, equally important driver was currency weakness. The yen had weakened to the 160 level against the dollar, prompting the Bank of Japan to reportedly spend 11.7 trillion yen (about $73.5 billion) on intervention operations in May — direct purchases of yen in the market to support its value. One market commentator described currency intervention without a matching change in domestic monetary policy as akin to tapping the brake while keeping the accelerator pressed — providing only temporary relief. Bitcoin Foundation
This illustrates an important concept: currency intervention (a central bank buying or selling its own currency to influence its exchange rate) tends to be far less effective and far more expensive than changing the actual policy rate, because traders quickly resume betting against a currency if the underlying interest-rate differential with other major economies hasn’t changed.
The inflation picture — more complicated than it looks
Here’s where the data gets genuinely interesting for anyone studying monetary policy. Japan’s core inflation actually eased to 1.4% in April 2026, its lowest level since March 2022, with headline inflation also at 1.4% — the fourth straight month below the BOJ’s 2% target. On the surface, that looks like a reason not to hike. But analysts noted this low reading was largely the result of temporary government measures — including the removal of Japan’s gasoline tax and free high school tuition — that mechanically suppressed measured inflation. Bitcoin FoundationBitcoin Foundation
This is the distinction between headline inflation (the raw, all-items inflation figure) and underlying inflation (the trend once temporary, policy-driven, or volatile items are stripped out). Deputy Governor Ryozo Himino explicitly flagged that wholesale inflation — prices charged between businesses, before reaching consumers — had been accelerating as firms passed on higher costs stemming from the Middle East conflict, creating a risk that underlying inflation could overshoot the 2% target. Latham & Watkins
Where rates go from here
Board member Naoki Tamura has argued the BOJ should continue raising rates at intervals of a few months, moving the policy rate gradually toward a “neutral” level of around 2% — the rate at which monetary policy is neither stimulating nor restricting economic activity. Tamura specifically noted that inflationary pressure from higher import costs is likely to pass through to consumer prices more quickly and broadly than it did after Russia’s 2022 invasion of Ukraine, reflecting a shift in how Japanese firms set prices — historically, Japanese companies were reluctant to raise prices even when costs rose, a behaviour that appears to be changing structurally. Latham & WatkinsLatham & Watkins
J.P. Morgan Asset Management’s Tai Hui noted that the overwhelming board support for the hike signalled the BOJ is now more attentive to inflation risk than to growth concerns, with easing fears over the Strait of Hormuz reopening giving the bank more confidence to resume its normalisation path. Bitcoin Foundation
Why this matters beyond Japan
For decades, Japan’s near-zero rates funded the global carry trade — a strategy where investors borrow cheaply in a low-interest-rate currency (yen) and invest the proceeds in higher-yielding assets elsewhere. As the BOJ continues raising rates, this trade becomes progressively less attractive to unwind, and rapid unwinds have historically caused global market volatility, as seen in August 2024. Bank of Japan officials see scope for additional rate increases later in 2026, citing still-low real interest rates — the policy rate adjusted for inflation — and persistent upside risks to prices. A real interest rate that remains low or negative, even after a nominal hike to 1%, signals that policy is still accommodative relative to inflation — meaning more hikes are plausible before year-end. PYMNTS.com
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