Tokyo CPI data bolsters case for BOJ September rate hike

The latest Tokyo inflation figures, which came in above expectations, add to the argument that the Bank of Japan could raise rates at its September 17-18 meeting. The central bank's preferred core-core measure is now only 2 basis points below a more notable level above its 2% target. Combined with a jump in wholesale inflation to 7.2% in July, the data supports the notion that cost pressures from the Middle East are still feeding through the supply chain with a delay, raising the possibility that consumer prices will keep climbing in the months ahead. With sources indicating the BOJ might adopt a faster hiking schedule than its recent twice-yearly pace, this latest print provides fresh evidence for near-term policy tightening.

Tokyo's consumer prices are approaching the Bank of Japan's 2% objective at a time when policymakers are considering another rate increase as early as September.

In summary:

• Tokyo's headline CPI increased 1.9% year-on-year in August, meeting the 1.9% forecast but dipping from 2% in July.
• Core CPI, which strips out fresh food, rose 1.8% year-on-year, above the 1.7% consensus estimate and up from 1.7% in July.
• The core-core index, which excludes fresh food and fuel and is the BOJ's preferred measure of underlying inflation, climbed 2.0% year-on-year, compared with 1.8% the prior month.
• The figures are considered a leading gauge for nationwide price trends and will be considered at the BOJ's policy meeting on September 17-18.
• The BOJ lifted its benchmark rate to a 31-year peak of 1% in June, kept it unchanged in July, but delivered its strongest warning yet about rising inflation risk.
• Wholesale inflation surged to 7.2% year-on-year in July, suggesting further cost pressures linked to the Middle East are still making their way to consumer prices.
• Reuters sources indicate the BOJ is poised to raise rates as early as September and may weigh a faster tightening pace than its recent roughly semi-annual rate.

Data released on Friday showed Tokyo's core consumer prices increased 1.8% in August compared with a year earlier, moving closer to the BOJ's 2% target and indicating wider price pressures related to the Middle East conflict. The figure surpassed the median market forecast of 1.7% and followed a 1.7% rise in July, continuing a streak of stronger-than-expected inflation readings from the capital.

The index that excludes fresh food and fuel costs, a metric the BOJ monitors as a key indicator of underlying inflation, rose 2.0% in August, compared with a 1.8% increase in July. Tokyo's headline CPI was 1.9%, in line with expectations and edging down from its prior peak in August. Since Tokyo's data usually previews national inflation trends by a few weeks, the release serves as an early indicator of broader Japanese consumer price movements.

The pickup in inflation comes at a critical time for the central bank, which will examine these figures along with other data before its next policy meeting on September 17-18. In June, the BOJ increased its benchmark rate to a 31-year peak of 1% as part of its gradual policy normalisation following years of near-zero rates. It kept rates unchanged in July but paired that decision with its most assertive language yet regarding the danger of rising inflation, a sign that officials are growing more concerned that price pressures could spread more widely.

Further bolstering that worry, wholesale inflation jumped to 7.2% year-on-year in July, a steep rise that analysts attribute to increasing cost pressures from the Middle East conflict. Since wholesale price movements tend to pass through to consumer prices with a delay, the surge implies that additional upward pressure on headline and core inflation may still be flowing through the pipeline in the coming months, even without considering any fresh shocks.

According to Reuters sources, the BOJ is now ready to increase rates as soon as its September meeting, and officials are reportedly considering a faster tightening pace than the approximately semi-annual rhythm the central bank has followed in this phase of normalisation. If the BOJ acts again in September, it would continue a policy trajectory that has already brought rates to their highest in 30 years, with the latest inflation data providing new ammunition for those inside the bank advocating for more and possibly quicker tightening.