Tokyo's consumer prices accelerated sharply in September, with core inflation rising above the Bank of Japan's 2 percent target for the first time since January and strengthening expectations that the central bank will deliver another interest rate hike in December.
Core consumer prices in the capital, which exclude fresh food but include fuel, rose 2.7 percent in September from a year earlier, up from 1.8 percent in August and above the median market forecast of 2.4 percent, data from the Tokyo Metropolitan Government's statistics office showed on Friday, according to Reuters reporting carried by Channel NewsAsia. That was the fastest year-on-year pace since a 2.8 percent increase in November 2025, and the first reading above the BOJ's 2 percent target since January. An index that strips out both volatile fresh food and fuel prices, the measure the BOJ watches more closely as a gauge of underlying trend inflation, rose 3.0 percent after a 2.0 percent gain in August, the fastest annual rise since August 2025. Service-sector inflation accelerated to 2.3 percent from 1.4 percent, which analysts read as evidence that firms are continuing to pass higher labour costs on to prices. Trading Economics, which republishes the official series, shows the same picture: Tokyo's core CPI at 2.7 percent year on year in September versus 1.8 percent in August, and the ex-food-and-energy index at 3.0 percent versus 2.0 percent.
Part of the September jump is mechanical. The increase came partly as government subsidies on water bills and childcare phased out, lifting the measured rate through base effects rather than a fresh burst of price pressure. Beyond that roll-off, prices rose across a broad range of food items and daily necessities as raw material costs climbed, and households paid more for personal computers and tablets as chip prices spiked, the data showed. The acceleration in services, from 1.4 percent to 2.3 percent in a single month, points to firms passing on rising wages in a tight labour market, the second-round effect the BOJ has flagged as its main uncertainty.
The Tokyo print matters because the capital's index is widely regarded as a leading indicator of nationwide trends, and the comparison baseline is much cooler. Japan's nationwide core inflation, which excludes fresh food, eased to 1.7 percent in August from 1.8 percent in July, the first slowdown in four months and still below the BOJ's 2 percent target, according to Trading Economics. The BOJ raised its key short-term rate by 25 basis points to 1.25 percent in a 7-2 vote at its September meeting, taking borrowing costs to their highest level since April 1995, the bank said via Trading Economics. In July the bank forecast core consumer inflation of 2.5 percent for fiscal 2026 and 2.4 percent for 2027, Reuters reported. It will update those quarterly projections at its next policy meeting on Oct. 29-30.
Why the Tokyo data matters for that meeting is that it strengthens the hand of officials arguing that inflation risks are skewed to the upside. "Even when discounting one-off factors, the inflation numbers are strong and show firms are steadily passing on rising costs from the weak yen and Iran war," said Yoshiki Shinke, senior executive economist at Dai-ichi Life Research Institute. Shinke added that nationwide core inflation will likely exceed 3 percent in coming months and that, with upside risks to underlying inflation, "the BOJ will be on the hook for another rate hike as soon as December." Masato Koike, senior economist at Sompo Institute Plus, said core inflation will continue to accelerate as a trend because of rising energy costs from the Middle East conflict and subsequent second-round effects, and said he expects the BOJ to raise its policy rate in December. Market participants have reduced bets on a back-to-back move this month, but many still expect one in December.
There are clear limits to what one month of Tokyo data proves. The print is a Tokyo figure, not a nationwide one, and its sharpest components, the expiry of utility and childcare subsidies and the pass-through of externally driven energy and raw-material costs, are partly temporary or imported. The BOJ itself has said underlying inflation, the broad demand-driven trend, is close to its 2 percent target but has not yet reached it. Analysts are watching whether the renewed rise in crude oil prices, tied to the conflict in the Middle East, prompts the bank to raise its inflation forecasts in October; those forecasts, not a single monthly print, will shape the rate path from here.
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