Japan’s central bank just did something it hasn’t done in over three decades. The Bank of Japan raised its benchmark interest rate by 25 basis points to 1% on June 16, 2026, pushing borrowing costs to their highest level since September 1995.

Governor Kazuo Ueda isn’t stopping there. He’s warning that inflation risks could push prices beyond the BOJ’s 2% stability target, meaning further rate hikes are very much on the table.

The end of ultra-loose monetary policy

Ueda flagged the need for discussions on additional rate increases on June 3, 2026, citing persistent inflationary pressures. His deputy, Ryozo Himino, echoed those concerns, pointing specifically to rising energy costs and geopolitical instability in the Middle East as key drivers.

The data backs them up. A new BOJ inflation measure showed core inflation hitting 2.8% in April 2026. That’s well above the bank’s 2% target, which was originally established back in January 2013.

Why crypto traders should care about Japanese monetary policy

The mechanism is something called the carry trade. For years, investors borrowed cheaply in yen (because Japanese rates were near zero) and deployed that capital into higher-yielding assets elsewhere. Stocks, bonds, crypto, you name it. When Japanese rates were essentially free, it was like getting a zero-interest loan to gamble with.

As the BOJ pushes rates higher, the math on those trades changes. Borrowing in yen becomes more expensive. The yen itself tends to strengthen as higher rates attract capital back to Japan. And the assets that were purchased with borrowed yen? They face selling pressure as traders unwind their positions.

We’ve seen this movie before. In August 2024, a surprise BOJ rate move triggered a violent unwind of yen carry trades that sent shockwaves through every major asset class. Bitcoin wasn’t immune.

What this means for investors

The BOJ’s hawkish pivot creates a few dynamics worth watching closely.

First, the yen. A strengthening Japanese currency acts as a headwind for risk assets globally. Every percentage point the yen gains against the dollar represents capital flowing out of risk-on trades and back into Japanese government bonds and savings instruments.

Second, global rate convergence. The BOJ raising rates while other major central banks are in various stages of cutting or holding creates unusual cross-currents in currency markets.

The next data point to watch is whether April’s 2.8% core inflation reading accelerates or moderates. If Japanese prices keep climbing, the BOJ will have no choice but to keep hiking, and each incremental move makes the carry trade unwind more likely.