Bank of Japan set to lift its policy rate to a 31-year high as the yen slides

Tokyo is expected to move to 1.25 per cent on Friday, a day after a hawkish Fed pushed the yen past the 156 level.

Assembled by Claude from 9 sources at 9 outlets · Thursday, September 17, 2026, Morning edition, 10:14 AM EDT · no human byline

What happened

The Bank of Japan is expected to raise its policy interest rate to 1.25 per cent from 1 per cent when its two-day meeting concludes on Friday mainichi.jpwsj.com. That would be the highest level in 31 years mainichi.jptradingview.com. Reuters put the expected move at 25 basis points reuters.com. Kyodo reported the meeting is framed around countering inflation risks mainichi.jp.

The currency has weakened into the decision. The yen traded at 155.98 per dollar, near a two-week low, as markets awaited the outcome and a hawkish Fed lifted the dollar index to a seven-week high wtvbam.com. Nikkei Asia reported the yen weakening to the 156 level once the Fed delivered the rate rise investors had expected, and quoted the view that the dollar's gains partly reflect investors' approval of the Fed's determination to fight inflation despite political pressure asia.nikkei.com.

Why it matters to investors

A rise is not costless at home. Japanese banks see a risk that rising bond yields lead to losses, according to a report published as the decision approached uk.finance.yahoo.com. That is the domestic cost of normalisation for institutions holding large books of government debt.

The external accounts are moving the same way as the currency. Japan recorded a trade deficit for a fourth consecutive month as oil imports soared, with the shortfall totalling 1.1 trillion yen, or about 7 billion dollars asahi.com. The same report noted that US Treasury Secretary Scott Bessent had made remarks widely seen as prodding Japan's authorities asahi.com.

For global investors the significance is the collision of paths. The Fed has just tightened and signalled more wtvbam.com, while Tokyo is expected to tighten from a far lower base wsj.com. TradingView described the dollar spiking above 156 yen precisely as the two rate paths collide tradingview.com.

What to watch

Politics has been arranged around the decision. Prime Minister Sanae Takaichi announced her first cabinet reshuffle since becoming prime minister last October on the eve of the meeting, in what the Financial Times described as a signal of confidence to markets ft.com. She retained key ministers reuters.com.

Three variables decide the yen from here. Whether the Bank delivers the 25 basis points markets expect reuters.com. Whether the Fed's path stays hawkish enough to keep the dollar bid wtvbam.com. And whether Japanese government bond yields rise far enough to strain bank balance sheets, which would turn a monetary story into a financial-stability one uk.finance.yahoo.com.

Sources

1. mainichi.jp: BOJ set to raise policy rate at 2-day meeting to counter inflation risks - The Mainichi (2026-09-17)
2. wsj.com: Fed Policy Outlook Weighs on Yen Ahead of Bank of Japan Decision - WSJ (2026-09-17)
3. tradingview.com: USD/JPY: Dollar Spikes Above ¥156 as Fed and Bank of Japan Rate Paths Collide (2026-09-17)
4. wtvbam.com: Hawkish Fed lifts dollar to seven-week high; markets brace for BOE, BOJ | WTVB (2026-09-17)
5. asia.nikkei.com: Yen weakens to 156-level as Fed fulfills rate hike expectations - Nikkei Asia (2026-09-17)
6. reuters.com: Japan's Takaichi retains key ministers in cabinet reshuffle - Reuters (2026-09-17)
7. asahi.com: Japan records a trade deficit for 4th month as oil imports soar | The Asahi Shimbun (2026-09-16)
8. ft.com: Japan's Sanae Takaichi reshuffles cabinet in signal of confidence to markets (2026-09-17)
9. uk.finance.yahoo.com: Japan Banks See Risk of Rising Bond Yields Leading to Losses - Yahoo Finance UK (2026-09-17)