The Bank of Japan* is expected to raise its benchmark interest rate tomorrow — from 0.75% to 1%. It sounds like a small number. For global investors, it’s worth understanding why it matters.
*The Bank of Japan (BOJ) is Japan’s central bank. It sets the country’s official interest rate, similar to how the Federal Reserve operates in the US.*
The carry trade you’ve probably never heard of
For decades, Japan kept interest rates near zero. That created an opportunity: borrow money cheaply in Japan, convert it to dollars or other currencies, and invest it in higher-returning assets abroad — US stocks, bonds, real estate.
This is called the carry trade*. Trillions of dollars have been built on it.
*A carry trade is when investors borrow in a low-interest-rate currency and invest in a higher-yielding one. The profit comes from the interest rate gap — as long as exchange rates stay stable.*
When Japan’s rates rise, that gap shrinks. The trade becomes less profitable. Investors who built positions on cheap yen borrowing start unwinding — selling their US assets, converting back to yen, repaying loans. That selling pressure can ripple across markets, sometimes quickly.
What makes tomorrow’s decision different
Japan held rates near zero for thirty years. The current tightening cycle — from near-zero to 1% — is historically significant. Markets aren’t watching whether the BOJ raises rates. They’re watching the language around what comes next.
If the BOJ signals further hikes are coming, yen carry trades unwind faster. If the tone is cautious, the reaction stays muted.
What this doesn’t mean
A BOJ rate hike is not a crisis signal. Japan raising rates reflects an economy that can finally handle higher borrowing costs — a sign of normalization, not panic. Short-term volatility from carry trade unwinding is real. The underlying thesis of most long-term equity positions usually isn’t changed by it.
My take:
The BOJ rate decision is a good reminder that markets are connected in ways that aren’t obvious. When a central bank on the other side of the world moves, US investors can feel it — not because Japan’s economy is driving ours, but because of the money flows built on rate differentials. Understanding the carry trade doesn’t require a finance degree. It just requires knowing that cheap money doesn’t stay cheap forever.
This is educational content, not investment advice.