Japan’s national consumer-price inflation rose to 2.1% in September 2026 from 1.9% in August, according to the Statistics Bureau’s data released on 23 October. The annual increase became larger even though the headline index was unchanged from the previous month.
Those statements are compatible: the annual rate compares September with September a year earlier, while the monthly rate compares it with August. The release concerns September prices across Japan, not October inflation or a Tokyo-only preliminary reading.
The official inflation measures
| Measure | September 2026 year on year | August 2026 year on year | September month on month | Primary evidence |
|---|---|---|---|---|
| All items | 2.1% | 1.9% | 0.0% | Table 1-1: annual and monthly sheets |
| All items excluding fresh food | 2.1% | 1.7% | 0.2% | Table 1-1, column J |
| All items excluding fresh food and energy | 2.4% | 1.9% | 0.3% | Table 1-1, column M |
| Food | 2.8% | 3.1% | −0.2% | Table 1-1, column O |
| Energy | −0.6% | −0.7% | −1.2% | Table 1-1, column CI |
The table uses the workbook’s published year-on-year and previous-month changes. The monthly numbers are not presented here as seasonally adjusted figures. Exact periods are September 2026 and August 2026 in the government’s national subgroup-index dataset.
Why two different exclusion measures matter
The fresh-food exclusion removes fresh food but retains energy. The fresh-food-and-energy exclusion removes both. September’s annual rates were 2.1% and 2.4%, respectively; calling either one simply “the inflation rate” without naming its basket can obscure the comparison.
Food’s annual increase slowed from 3.1% to 2.8%, while energy remained below its year-earlier level. These category rates do not by themselves quantify each category’s contribution to headline inflation. This report does not infer such a contribution or invent a single cause for the overall change.
An index level is not a percentage increase
The all-items index stood at 102.2 on the 2025=100 base, the same published level as in August. That is an index level, not a yen amount or a 102.2% annual price increase. The official annual change was 2.1%.
Using the published percentage changes also avoids adding false precision by recalculating growth from rounded index levels. The underlying CPI summarizes a consumer-price basket; it does not imply that every item or every household’s spending increased at the same rate.
What this release does—and does not—establish
The practical reading is that average consumer prices were above their year-earlier level, with annual inflation higher than in August. It is not evidence of a new monthly price jump in the all-items measure. Nor does the statistical release establish a future Bank of Japan decision, a yen-market reaction or an increase in real wages.
Readers following policy should distinguish the data from a central bank’s separately announced decision. For an example of reporting that distinction in another country, see CapKet’s Bank of Israel policy report; it is not evidence about Japan’s policy.
The Statistics Bureau release listing identifies 23 October as the publication date for September’s national CPI. The month measured and the date published should remain separate when sharing the figures.
Official evidence and checks
Statistics Bureau of Japan / e-Stat — japan-table; Statistics Bureau of Japan — japan-release; Statistics Bureau of Japan / e-Stat — japan-dataset. These are exact issuer or government records, not independent corroboration of one another. Recorded source observations: 2026-10-23T05:58:48.842Z; 2026-10-23T05:58:49.852Z; 2026-10-23T05:58:51.419Z. AI-assisted primary-evidence review; no independent human editorial approval or investment advice is claimed.
Recorded source observation: . This is a source-check timestamp, not a market quote or a new article update.