Yen up 4% this month as Fed decision pressures BOJ

The yen has risen roughly 4% this month and traded at ¥153.49 per dollar on Monday, near a seven-month high of ¥152.89 reached last week. Speculators turned net-long on the yen for the first time since February.

U.S. consumer prices accelerated in August. Futures-based markets placed an 86% chance on a Federal Reserve rate increase for Wednesday, according to the CME FedWatch tool. The Bank of Japan is scheduled to meet two days later on Friday.

Analysts at MUFG said a quarter-point BOJ rate rise is already largely priced in but that further yen gains would require clear signals of faster follow-up hikes. TD Securities cautioned that if the BOJ signals it will not tighten again in October and December, dollar/yen could move back toward the ¥157–¥160 range.

Hedge funds and other investors have adjusted carry trade positions in response to the yen’s appreciation. Large domestic flows have also supported the currency: repatriation and asset allocation shifts at Japan’s Government Pension Investment Fund have returned money to yen assets, separate from rate expectations.

The yen’s advance this month has added pressure on policymakers in Tokyo. The European Central Bank raised rates last week, and the Bank of England is expected to hold rates on Thursday. The U.S. dollar index stood around 99.15 after two weeks of declines.

James Athey, a fixed-income portfolio manager at Marlborough, warned: “Not hiking would be a catastrophic error. Not communicating robustly will be a significant own goal.” Athey pointed to repatriation flows and GPIF moves as factors already pulling money back into yen assets.

Traders and analysts say the Fed’s decision on Wednesday could prompt an immediate market reaction, while the BOJ’s statement on Friday is expected to provide guidance on the timing and pace of any further rate increases.