For the first time since 2023, the Fed increased borrowing costs on Wednesday and indicated additional hikes ahead. That led markets to factor in three further increases by mid next year, a path that keeps the interest-rate gap with Japan wide even if the Bank of Japan nudges its own policy rate higher this week. In the aftermath, the yen weakened up to 1% overnight to 156.42 per dollar.
The decline came after a strong early-month surge driven by expectations of a faster BOJ shift toward tighter policy, the reversal of yen-funded carry positions, and chatter that Japanese pension funds might steer additional capital into local markets.
Overnight index swaps suggest a 25-basis-point BOJ move is largely in the price, putting Governor Kazuo Ueda's post-decision press conference center stage as investors look for signals on how quickly and how extensively any subsequent tightening could unfold. Board member Hajime Takata, known for a hawkish tilt, has kept open the possibility of a larger-than-usual step or consecutive moves.
Glenn Yin, ACCM's director of research in Melbourne, said, "Japan is certainly facing an enormous amount of pressure to both hike and deliver a hawkish message to minimize the damage." If the BOJ underwhelms, "the 160 level in short order is not a risk you can write off."
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Senior rates and FX strategist Rinto Maruyama at SMBC Nikko Securities says the yen's renewed slide gives the BOJ more reason to stress upside inflation risks, with higher oil prices adding justification for tighter policy. He expects Friday's likely increase to lift Japan's policy rate into what estimates define as the neutral range, which makes it unlikely officials will signal a 50-basis-point step or a sequence of back-to-back hikes. If the meeting reads as dovish, he identifies 158 as the next upside objective for dollar-yen, and over time he thinks the pair could edge back toward 160 if US rates outpace Japan's.
Aozora Bank Ltd.'s chief market strategist, Akira Moroga, cautions that the BOJ "may not adopt a stance as hawkish as the Fed's, which could serve as an immediate catalyst for yen weakness." He highlights 158.50 per dollar - near the 200-day moving average - as the subsequent key marker.
Some of the fuel for a bigger drop may already be spent. Carry traders were burned by the yen's recent rally, and hedge funds have trimmed bearish bets. In the week ending Sept. 8, leveraged funds halved their yen shorts, the Commodity Futures Trading Commission's figures show. The possibility of official action could also temper the currency's slide. Authorities in Japan and the US have demonstrated readiness to intervene together, and Treasury Secretary Scott Bessent has kept signaling support for a stronger yen.
Bottom line for regular investors: the near-term path hinges on how the BOJ's message stacks up against the Fed's projected tightening. If the BOJ sounds cautious, traders are watching 158 first, with a potential drift toward 160 if US rates keep outpacing Japan's.
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