A beat across all three measures, and by half a point on the BOJ's preferred trend gauge, is likely to lift pricing for an October hike and push short-dated Japanese government bond yields higher, offering the yen some support against the dollar. The breadth of the rise, including services, matters more to the BOJ than the headline jump, since water subsidies explain only part of it. Energy is the other channel: with Brent back above $100 on the Iran war and China's fuel export halt, imported fuel costs are likely to keep feeding Japanese inflation into the national data due later this month. The slight rise in unemployment is unlikely to shift the policy debate.

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Background:

• Tokyo CPI preview: core inflation seen jumping to 2.4% as BOJ weighs its next hike

And, the 'just the data' post from earlier:

• Japan September Tokyo CPI data surges ahead of expectations and August

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Tokyo inflation did not so much rise as leap in September, handing the BOJ a strong argument for not waiting long before its next hike.

Summary:

• Tokyo core CPI (ex fresh food) rose 2.7% y/y in September, versus 2.4% expected and 1.8% in August
• Headline Tokyo CPI also rose 2.7%, above the 2.5% forecast and up from 1.9%
• CPI excluding fresh food and energy jumped to 3.0% from 2.0%, against 2.5% expected, the fastest since August 2025
• Services inflation rose to 2.3% from 1.4%; water subsidy phase-out contributed but gains were broad-based
• Japan's August unemployment rate edged up to 2.5% (expected 2.4%); the jobs-to-applicants ratio held at 1.18
• The BOJ issues new quarterly forecasts at its October 29-30 meeting

Consumer inflation in Tokyo accelerated sharply in September, with core prices rising at the fastest pace in 10 months and a key gauge of underlying inflation hitting 3%, adding to the case for further interest rate increases by the Bank of Japan.

Core CPI in the capital, which excludes fresh food but includes fuel, rose 2.7% from a year earlier, up from 1.8% in August and well above the median forecast of 2.4%. It was the first reading above the BOJ's 2% target since January and the fastest annual pace since November last year. Headline Tokyo CPI also rose 2.7%, against expectations of 2.5% and up from 1.9% the previous month.

The measure excluding fresh food and energy, which the BOJ watches closely as a guide to trend inflation, jumped to 3.0% from 2.0%, beating forecasts of 2.5% and marking its fastest rise since August 2025.

Part of the acceleration reflected the phasing out of water bill subsidies, but price increases were broad, covering food, transport and hotel charges. Services inflation picked up to 2.3% from 1.4%, a sign that businesses are passing on higher labour costs in a tight job market.

Separate data showed Japan's unemployment rate edged up to 2.5% in August, above expectations of 2.4%, while the jobs-to-applicants ratio held at 1.18, in line with forecasts.

The Tokyo figures are viewed as a leading indicator for nationwide inflation and will feed into the BOJ's new quarterly price forecasts at its October 29-30 policy meeting. The central bank raised its policy rate to 1.25%, a 31-year high, in September, and Governor Kazuo Ueda has signalled a new phase focused on preventing inflation from overshooting its target.

Some economists expect core inflation to keep trending higher as energy costs from the Middle East conflict feed through to other prices, and see the BOJ raising rates again by December. The strength of the September data is likely to sharpen debate over whether the next move could come as early as the October meeting:

This article was written by Eamonn Sheridan at investinglive.com.

Source: Investing Live - Central Bank