Tokyo CPI Test Looms as BoJ September Hike Bets Near 80%
Tokyo CPI due Friday after July core hit a six-month high. BoJ September hike bets near 80%. The 'naphtha-flation' mechanism and base-year change add layers to the read.
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Tokyo-area inflation data due Friday will test whether the Bank of Japan's September rate-hike path stays intact, after July's core print hit a six-month high and market pricing for a move to 1.25% climbed to just under 80%.
Tokyo's July core CPI, which strips out fresh food, accelerated to 1.90% from 1.60% in June, beating the 1.7% consensus and marking the fastest pace since January. The core-core measure the BoJ treats as its preferred underlying gauge rose further, with CPI excluding both fresh food and energy costs increasing 2.0% year-on-year, up from 1.9% in June and the highest reading in four months.
Headline inflation stayed below the BoJ's 2% target for a sixth consecutive month. Fuel subsidies and favourable base effects from last year's energy price pass-through continued to cushion the impact of higher raw material costs tied to Middle East tensions, according to the data.
Nationwide July CPI, released weeks after the Tokyo figures, confirmed the trajectory. Core inflation matched forecasts at 1.8% year-on-year, while the BoJ's own underlying price gauge held above the 2% target.
Analysts have coined the term "naphtha-flation" for the mechanism driving the pickup: oil and raw material cost increases filtering into everyday consumer goods like detergents and plastics via a weak yen and elevated crude prices. That dynamic has hardened rate-hike bets. Market pricing for a September BoJ move to 1.25% has risen to just under 80%, up from around 65% on August 7, partly on reports the Takaichi government supports earlier tightening.
One added wrinkle for comparability: the Statistics Bureau shifted its CPI base year from 2020 to 2025 starting with July's data. Market commentary has flagged the change when reading month-on-month moves.
The Tokyo print is the first major data point for the August cycle and will set the tone for the nationwide release that follows. A print matching or exceeding July's pace would reinforce the September hike case. A miss would revive the dovish tail that has kept the yen from breaking higher despite the narrowing rate differential with the U.S.
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