Bitcoin Rises as BOJ Raises Policy-Rate Target to 1.25%

The Bank of Japan raised its policy-rate target to about 1.25% on Sept. 18, approving the change by a 7–2 vote. The bank increased its target for the uncollateralized overnight call rate by 25 basis points, from roughly 1% to about 1.25%, and set the new target and related facility rates to take effect on Sept. 24. The BOJ tied any further moves to its assessment of economic and inflation data rather than to a fixed timetable.

Markets began adjusting before the official funding cost change. The separation between the announcement and the operational implementation allowed investors to reprice positions in the days before Sept. 24. Exchange data showed Bitcoin near $76,960 at the time of the announcement, around $77,380 roughly 30 minutes later, and an intraday peak near $81,000 later in the session. Over 24 hours, the token rose about 5.7%.

Currency markets moved alongside risk assets. The dollar reached about 157.84 yen during the BOJ governor’s press briefing, leaving the yen roughly 1.2% weaker on the day. Those moves differed from the rapid yen appreciation that typically accompanies a broad unwind of yen-funded carry trades.

The rate rise affects yen-funded carry trades, where investors borrow yen to buy higher-yielding assets abroad. Higher Japanese rates reduce the interest-rate advantage of those trades. If the yen strengthens, borrowers who used yen funding can face higher repayment costs in their home currencies, which can force leveraged investors to unwind positions and affect risk assets.

The amount of Bitcoin exposure financed in yen is not well quantified. A review of an earlier carry-related episode found multiple simultaneous triggers, including weaker U.S. data and sector-specific market stress, indicating that yen funding is one of several channels that can influence cryptocurrency prices.

The BOJ said financial conditions would remain accommodative while keeping open the option of additional increases if its economic and inflation outlooks warrant further tightening. Implementation of the higher target and facility rates on Sept. 24 could prompt further position adjustments.

Market observers will watch for signs of a disorderly unwind, which would include sharp yen appreciation coupled with declines in cryptocurrencies and equity markets. The coming days before Sept. 24 will show how investors reposition ahead of the new funding costs and how the yen-carry test unfolds.