Japan’s Service Inflation Keeps a BOJ Hike in Play
Japan’s SPPI remains firm near 3% as markets price a September BOJ hike, though softer momentum questions how quickly further tightening may follow.
Matt Simpson
- Currencies
Japan’s Service Inflation Keeps a BOJ Hike in Play
By: Matt Simpson, Market Analyst
Japan’s service inflation remains persistent enough to support expectations for another BOJ hike in September, but softer near-term momentum offers little evidence that policymakers need to tighten again quickly.
Japan’s Service Inflation Supports Further BOJ Tightening
Source: Bank of Japan
Markets are increasingly expecting the Bank of Japan to raise interest rates again when it meets on 17-18 September, leaving the bigger question less about whether it hikes and more about what comes next.
A Reuters poll conducted earlier this week found 57% of economists expect the BOJ to raise its policy rate from 1% to 1.25% in September, with some already looking for another increase to 1.5% before year-end. Markets have leaned even more heavily towards a September move following persistent inflation, yen weakness and rising Japanese yields.
Market pricing puts the probability of a hike closer to 80%, shifting the focus towards the BOJ's guidance. A September hike without any indication of further tightening could leave the yen vulnerable to renewed weakness, although the MOF remains on standby should depreciation become too rapid or prolonged.
While the BOJ expects headline inflation to remain above 2%, the bigger policy question is whether domestic price pressures are becoming more persistent. Japan’s latest SPPI suggests they just might, although there is little evidence of renewed price acceleration.
SPPI Momentum Remains Elevated, But Has Cooled
Japan SPPI chart shows service inflation near 3% while three-month annualised momentum cools ahead of the September BOJ meeting.
Source: Source: Bank of Japan
- Japan’s headline SPPI rose 3.6% y/y in July, up from 3.4% in June, while ex-international transportation and high labour-cost services remained close to 3%.
- Transportation and postal services jumped 1.44% m/m and 6.41% y/y, helping lift the headline, though transport is more exposed to fuel, freight and external costs.
- More relevant for the BOJ is that domestic service inflation remains firm even after stripping some of that out.
- The broader trend remains firm, but recent momentum has softened.
- The three-month annualised rate for SPPI ex international transportation slipped to -0.35%, while high labour-cost services ran at just +0.70%.
Ultimately, the data point to persistent service inflation without renewed acceleration. That remains consistent with another BOJ hike, but offers little support for a rapid follow-up move.
Tokyo CPI is next and should provide a more timely read on whether consumer inflation is telling a similar story. Tokyo core CPI has historically tracked the national measure closely, so another firm reading would reinforce the case that underlying inflation remains persistent heading into the BOJ meeting.
Source: Statistics Bureau of Japan
Market Pricing Still Points to Further BOJ Tightening
Japan’s 2-year JGB yield has risen to around 1.7%, nearly 70bp above the BOJ’s 1% policy rate. That suggests markets are already pricing further tightening beyond September, leaving the BOJ’s guidance on the path towards 1.5% as the more important signal.
Source: TradingView
- Currencies
The subsidiaries of StoneX Group Inc. provide financial products and services, including, but not limited to, physical commodities, securities, clearing, global payments, risk management, asset management, foreign exchange, and exchange-traded and over-the-counter derivatives. These financial products and services are offered in accordance with the applicable laws in the jurisdictions in which they are provided and are subject to specific terms, conditions, and restrictions contained in the terms of business applicable to each such offering. Not all products and services are available in all countries. The products and services offered by the StoneX Group of companies involve risk of loss and may not be suitable for all investors. Full Disclaimer. This content is not intended for residents of any particular country, and the information herein is not advice nor a recommendation to trade nor does it constitute an offer or solicitation to buy or sell any financial product or service, by any person or entity in any jurisdiction or country where such distribution or use would be contrary to local law or regulation. Please refer to the Regulatory Disclosure section for entity-specific disclosures. No part of this material may be copied, photocopied or duplicated in any form by any means or redistributed without the prior written consent of StoneX Group Inc. The information herein is provided for informational purposes only. This information is provided on an ‘as-is’ basis and may contain statements and opinions of the StoneX Group of companies as well as excerpts and/or information from public sources and third parties and no warranty, whether express or implied, is given as to its completeness or accuracy. Each company within the StoneX Group of companies (on its own behalf and on behalf of its directors, employees and agents) disclaims any and all liability as well as any third-party claim that may arise from the accuracy and/or completeness of the information detailed herein, as well as the use of or reliance on this information by the recipient, any member of its group or any third party.
© 2026 StoneX Group Inc. all rights reserved.
Discover more insights
Our subscribers have access to comprehensive market analysis from StoneX spanning commodities, equities, currencies and more.
Related articles for Currencies
FX Weekly Overview (Brazil Issue)
Dollar to reflect Jackson Hole Symposium, inflation data in the US and Brazil, and Brazil's electoral race
Leonel Mattos
- Currencies
Japan Is Losing a Third of Its Population and the Yen Is Paying for It
Japan's population decline is the structural constraint sitting underneath the yen, and the arithmetic behind it leaves almost no room for real growth. James Stanley explains why that limits how the Bank of Japan can respond when the currency moves.
Editorial Team
- Currencies
StoneX: We open markets
Our market expertise, advanced platforms, global reach, culture of full transparency and commitment to our clients’ success all set us apart in the financial marketplace.
Reach
With access to 40+ derivatives exchanges, 180+ foreign exchange markets, nearly every global securities marketplace and numerous bi-lateral liquidity venues, StoneX’s digital network and deep relationships can take clients anywhere they want to go.
Transparency
As a publicly traded company meeting the highest standards of regulatory compliance in the markets we serve; our financials and record of accomplishment are matters of public record. StoneX’s commitment to “doing the right thing over the easy thing” sets us apart in the industry and helps us build respect, client trust and new partnerships.
Expertise
From our proprietary Market Intelligence platform, to “boots on the ground” expertise from award-winning traders and professionals, we connect our clients directly to actionable insights they can use to make more informed decisions and achieve their goals in the global markets.