Japan’s core Consumer Price Index (CPI) slowed to 2.7% year-on-year in August, down from 3.1% in July, but still exceeding the Bank of Japan’s (BoJ) 2% target. An index excluding fresh food and fuel, a key indicator of underlying inflation, increased by 3.3% year-on-year, slightly down from 3.4% in the previous month.
This data provides some relief for households but is strong enough to maintain BoJ’s cautious stance. Policymakers are expected to keep interest rates at 0.5% after their meeting concludes on Friday. Governor Kazuo Ueda has emphasised patience due to uncertainties about the impact of U.S. tariffs on Japan’s economy.
BoJ’s Short-Term Outlook
The BoJ anticipates that short-term price pressures from food and imports will diminish, and that wage growth and consumption will gradually support more durable inflation. Meanwhile, a Nikkei report and various sources indicate the BoJ plans to maintain the current rate at their September meeting. MUFG suggests any rate hike may be delayed until January 2026. The economic calendar in Asia for 19 September 2025 includes Japan’s inflation data release following the BoJ meeting.
With Japan’s inflation easing but still above the Bank of Japan’s target, the central bank’s decision to hold rates at 0.5% is already priced in. We see this creating a period of low volatility in the yen over the next few weeks. This environment is favorable for strategies that profit from range-bound markets, such as selling short-dated strangles on the USD/JPY pair.
Market Implications
The primary driver for the currency remains the significant interest rate differential between Japan and the United States. With the U.S. Federal Reserve’s policy rate currently at 3.5%, the 300-basis-point gap continues to make the yen-funded carry trade highly appealing. This fundamental factor will likely keep the yen weak against the dollar.
We remember this dynamic well from the 2022-2024 period, when a widening rate gap led to a sharp depreciation of the yen. While the BoJ has since moved away from negative rates, the core story has not changed. The high cost of holding long yen positions should discourage any significant strengthening of the currency for now.
For equity traders, the central bank’s patient stance and the resulting weakness in the yen are supportive for the Nikkei 225. A weaker yen boosts the overseas earnings of Japan’s major exporters, which could provide upside for the index. We see potential in using Nikkei futures or call options to position for this continued support.
The main risk to this view is if wage growth, which saw a 4.1% average increase in the latest ‘shunto’ negotiations, begins to stoke domestic demand more aggressively than expected. Any data suggesting that real wages are turning positive could force the BoJ to pivot to a more hawkish stance sooner than markets anticipate. We will be watching retail sales and services PMI data closely for any signs of this shift.
