Japan’s gross domestic product (GDP) deflator rose by 3.4% year on year in the first quarter. This was above the expected increase of 3.1%.
The GDP deflator measures changes in prices for goods and services produced in the economy. The difference between the actual and expected readings was 0.3 percentage points.
Inflation Appears More Persistent
This stronger-than-expected inflation reading of 3.4% suggests that price pressures in Japan are more embedded than we previously believed. The Bank of Japan has been looking for signs of sustainable inflation, and this data point provides a compelling one. We must now anticipate that the central bank will be forced to consider a more hawkish policy stance sooner than the market has priced in.
Given this, we see an increased probability of another interest rate hike from the Bank of Japan within the next quarter. The bank has only moved its policy rate once, to 0.1%, since ending the negative interest rate policy back in March 2024. This persistent inflation, combined with the final 2026 spring “shunto” wage negotiation results showing an average pay increase of 4.3%, gives policymakers the justification they need to act.
We should be positioning for a stronger yen in the coming weeks, as interest rate differentials with the U.S. will begin to narrow. Looking back at 2025, we saw the yen weaken significantly against the dollar whenever BoJ guidance was perceived as too dovish. This time, the inflation data is too strong to ignore, making yen strength the more probable path.
For currency traders, this suggests it is time to look at buying yen calls or selling out-of-the-money call spreads on USD/JPY. Volatility in the yen has been steadily climbing since April, and this data will likely amplify that trend. These option strategies allow for defined risk while capturing potential upside from a hawkish policy shift.
This outlook also has negative implications for Japanese equities, which have benefited from a weak yen and loose monetary policy. A more aggressive central bank and a stronger currency will likely weigh on the profits of Japan’s large exporters. We believe it is prudent to consider buying protective puts on the Nikkei 225 index or initiating small short positions via futures.
Rates And Markets Likely Reprice
In the bond market, this data puts direct upward pressure on Japanese Government Bond (JGB) yields. The BoJ has been the primary buyer of these bonds for years, but sustained inflation will force it to reduce its support. Therefore, we anticipate that shorting JGB futures will become an increasingly viable trade.
