The Services Producer Price Index — SPPI, in Japanese kigyo-muke sabisu kakaku shisu (企業向けサービス価格指数, literally the “price index of services for enterprises”) — is the Bank of Japan’s cleanest monthly read on whether wages are actually pushing up prices. Unlike CPI, which is muddied by government energy measures and imputed rent, and unlike the goods PPI, which mostly tracks imported commodity costs and the yen, the SPPI prices what companies charge each other for largely labor-intensive services. That makes it the closest thing Japan publishes to a monthly wage-passthrough meter, which is why one line in an otherwise obscure BoJ statistics release can move JGB yields, the currency, and bank stocks.
Interest in the gauge spikes around policy meetings, and this guide was prompted by one: the BoJ’s next Monetary Policy Meeting is set for September 17–18, 2026 — six days away as this is written — and previews of the decision keep circling back to what services prices say about underlying inflation. Everything below, however, is meeting-agnostic: it reads the same in any month, ahead of any decision.
What the SPPI actually measures
The BoJ’s Research and Statistics Department surveys roughly 150 categories of services traded between companies and compiles them into a monthly index. These are transaction prices — what a manufacturer pays its freight carrier, what a bank pays its systems integrator, what a retailer pays a temp-staffing agency — not list prices and not what households pay. The broad groups cover transportation and postal services, information and communications, leasing and rental, advertising, finance and insurance, real estate services, and a catch-all “other services” group that contains most of the labor-intensive categories the BoJ cares about.
The design choice matters: because the basket is business-to-business services, the index is dominated by domestic labor costs rather than imported inputs. When Japanese firms raise wages and then raise the prices they charge each other to cover those wages, the SPPI is where it shows up first and most cleanly.
Three inflation gauges, three different stories
| Gauge | Japanese name | Publisher | What it prices | Dominant driver | Typical release |
|---|---|---|---|---|---|
| CPI | shohisha bukka shisu | Statistics Bureau (MIC) | Household basket | Mix of wages, imports, policy measures | Around the third week, prior month |
| Goods PPI (CGPI) | kigyo bukka shisu | Bank of Japan | Goods traded between firms | Commodities, import costs, the yen | Around the 10th–13th |
| Services PPI (SPPI) | kigyo-muke sabisu kakaku shisu | Bank of Japan | Business-to-business services | Domestic labor costs | Around the 25th–26th |
A useful mental model: the goods PPI is Japan’s imported inflation thermometer, the SPPI is its homegrown inflation thermometer, and CPI is the blend that eventually reaches households. During the global cost shock of the early 2020s, the goods PPI spiked to multi-decade highs while the SPPI moved far more modestly — a textbook illustration that the two indices answer different questions. A central bank trying to judge whether inflation is self-sustaining, rather than imported, has every reason to weight the services index.
Why the BoJ treats it as the cleanest wage signal
The BoJ’s stated condition for normalizing policy has long been a durable wage-price cycle: wages rise, firms pass the cost into prices, and expectations adjust. Services are where that passthrough is most visible because labor is the dominant input — there is no oil price or exchange rate to hide behind in the fee an accounting firm or a staffing agency charges. For most of Japan’s two deflationary decades the SPPI hovered around zero or below, which is precisely why sustained positive readings are treated as regime evidence rather than noise. Historically, a services index running near the BoJ’s 2% objective, rather than near zero, is what distinguishes the post-2024 tightening era from every false dawn before it.
Release mechanics: around the 25th–26th, 8:50 a.m. Tokyo
- Publisher and time: the Bank of Japan, typically at 8:50 a.m. JST — before the Tokyo cash equity open at 9:00, so the first reaction shows up in JGB futures, overnight-index pricing, and the yen within minutes.
- Reference period: the prior month, with figures revised in subsequent releases; the index is rebased periodically, so always check the base year before comparing long histories.
- Where: the BoJ’s statistics pages, with an English release alongside the Japanese one.
- Calendar trap: the release often lands within a few days of month-end Tokyo CPI, so attribute market moves carefully when both print in the same week.
The components that matter
Traders rarely stop at the headline year-on-year figure. The information is in the labor-intensive categories:
- Worker dispatching (temp staffing): the closest thing to a spot price for labor; the purest single wage-passthrough read in the index.
- Building maintenance, security, and cleaning: contract-based, wage-heavy services where price hikes signal that even low-margin suppliers have pricing power.
- Professional services (legal, accounting, engineering and architectural design): sticky fees that move only when wage pressure is broad.
- Volatile items to discount: hotels (swung by inbound tourism) and international transportation (swung by freight rates and fuel). Analysts routinely check measures excluding these before judging a beat or miss.
One seasonal rule of thumb: the April print is the most important of the year. Japanese corporate contracts reset at the fiscal-year start, so April is when firms decide how much of the shunto (春闘, the annual spring wage negotiations between unions and employers) settlement they pass into service prices. A strong April SPPI validates the wage round; a weak one undermines it regardless of how generous the headline wage deals looked.
Worked example: setting your baseline with the JGB curve
An SPPI print only means something against the rate expectations already in the market. Here is how to build that baseline with real figures, using Ministry of Finance official JGB yields as of the September 10, 2026 close:
- Read the 2-year first: 1.823%. The short end is effectively the market’s compressed forecast of the policy rate over the next couple of years. With the policy rate well above zero after the hikes that began in 2024, a 2-year in the low-1.8s tells you further tightening is partly — not fully — priced.
- Read the 10-year: 2.920%. The long end blends the policy path with term premium and long-run inflation views. The roughly 1.1-percentage-point gap over the 2-year (as of that date) is your slope baseline.
- Know which part moves. A hot services print shifts near-term hike probabilities, so the 2-year and 5-year (2.244% on the same date) typically move most, flattening the curve; the 30-year (3.995%) responds more to supply and term premium than to any single monthly release.
- Cross-check the yen. With dollar-yen around 153–154 in mid-September 2026, a services-price beat that pulls hike expectations forward tends to firm the yen via rate differentials; a miss does the opposite.
- Then look at banks. Higher short-end yields support lending margins. Megabanks such as MUFG (8306, which closed at ¥3,661 on September 11, 2026) are the standard equity expression of a hawkish services surprise.
Beat or miss: the typical reaction map
- Beat (hotter than expected): rate-hike odds firm, 2–5-year JGB yields rise, the yen strengthens, bank and insurance stocks outperform, and long-duration growth stocks and yen-sensitive exporters tend to lag.
- Miss (cooler than expected): the reverse — hike expectations fade, the short end rallies, the yen softens, and banks give back ground.
- Magnitude caveat: on an ordinary month the reaction is modest compared with CPI or the Tankan survey. It grows sharply when the release falls just before a live policy meeting, when the BoJ has explicitly flagged services prices, or when the print is an April fiscal-year reset.
Common mistakes to avoid
- Confusing the BoJ’s two price releases. The goods CGPI arrives mid-month; the SPPI arrives around the 25th–26th. Headlines saying “Japan PPI” often mean the goods index — check which one moved before reacting.
- Trading the headline without the ex-volatile detail. A hotel- or freight-driven beat is not wage passthrough; markets fade those within hours.
- Ignoring the April reset. Comparing April’s jump with March’s flat reading and calling it acceleration misreads a seasonal contract-repricing pattern.
- Extrapolating one month. The BoJ frames its judgment around trends and revisions; a single print rarely changes the policy path on its own.
FAQ
When and where is Japan’s Services PPI released?
By the Bank of Japan, monthly, typically around the 25th–26th at 8:50 a.m. Tokyo time, covering the prior month. English-language releases and downloadable time series are on the BoJ statistics pages.
Is the SPPI the same as the services component of CPI?
No. CPI services measure what households pay and are heavily dampened by imputed rent, which barely moves. The SPPI measures business-to-business service prices, so it responds faster and more cleanly to labor-cost changes.
What counts as a “strong” SPPI reading?
Context and surprise matter more than the level. Against a deflation-era norm of roughly zero, sustained readings around the BoJ’s 2% objective are treated as evidence of a durable wage-price cycle — but on release day, the market trades the gap versus consensus and the breadth of the labor-intensive components, not the headline alone.
Why does a central bank publish a producer price index at all?
Historical legacy: the BoJ has compiled Japan’s wholesale and corporate price statistics for roughly a century, long predating the modern policy framework. The practical benefit is that the institution setting rates also curates the wage-passthrough data it relies on, with consistent methodology.
Sources
- Bank of Japan — Services Producer Price Index and Corporate Goods Price Index releases: www.boj.or.jp/en
- Ministry of Finance Japan — official JGB yield data: www.mof.go.jp/english
- Japan Exchange Group — market statistics: www.jpx.co.jp/english
- Nikkei Indexes — index data: indexes.nikkei.co.jp/en
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.