The USD/JPY exchange rate surged to 158.77 on May 15, 2026, extending the dollar's advance against the Japanese yen to levels not seen since the early 1990s. The move was driven by accelerating U.S. inflation, which reinforced expectations that the Federal Reserve will hold interest rates at elevated levels well into 2027, while the Bank of Japan remains stuck at 0.75% amid its own economic uncertainties. The nearly 300-basis-point gap between U.S. and Japanese policy rates has turned the yen carry trade into one of the most profitable strategies in global currency markets this year.
The yen's weakness reflects a structural problem for Japan: soaring energy import costs from the Middle East crisis are widening the trade deficit, while the BOJ lacks the room to raise rates aggressively without risking a fragile domestic recovery. For currency traders, the path of least resistance for USD/JPY remains higher until the rate differential meaningfully narrows.
What Happened
The dollar gained traction throughout the week of May 12-15 after the Bureau of Labor Statistics reported that U.S. consumer prices rose 3.8% year-over-year in April, the highest since May 2023. Energy prices, which jumped 3.8% month-over-month, accounted for more than 40% of the headline gain. Core CPI, excluding food and energy, increased 2.8% annually, keeping inflation well above the Federal Reserve's 2% target. The report crushed remaining hopes for a near-term rate cut, with Bank of America now projecting the Fed will hold steady through all of 2026 and begin cutting only in July 2027.
On the Japanese side, the Bank of Japan kept its policy rate steady at 0.75% at its April 28 meeting in a split 6-3 vote. Three dissenting board members pushed for a hike to 1.0%, arguing that Middle East tensions had skewed price risks to the upside. The BOJ raised its core inflation forecast to 2.8% from 1.9%, acknowledging the energy cost pressures, but Governor Ueda signaled caution given the uncertain global outlook. Oxford Economics projects the BOJ will resume rate normalization in July, but the timing remains fluid.
Japan's currency woes were compounded by reports that Tokyo may have intervened in currency markets twice in recent weeks, spending an estimated $30-40 billion to slow the yen's decline. Despite these interventions, the yen has continued to weaken, with CNBC reporting that markets are testing Tokyo's resolve. The yen has depreciated roughly 8% against the dollar year-to-date, making it one of the worst-performing G10 currencies in 2026.