South Korea August inflation rises to 3.1 percent, missing market forecasts

South Korea’s consumer price index rose 3.1 percent in August from a year earlier, accelerating from 2.8 percent in July. The figure fell short of the 3.2 percent median forecast expected by economists.

The headline increase was heavily influenced by a 6.5 percent rise in public services. This was driven by a 26.7 percent surge in mobile service fees, reflecting temporary price discounts applied during the same period last year.

Stripping out this one-off mobile fee effect, underlying inflation would have been significantly weaker at 2.5 percent. Additionally, nationwide fuel price caps actively suppressed the overall inflation rate by 0.3 percentage points last month, according to the finance ministry.

Petroleum prices continued to climb, rising 14.2 percent year-on-year in August. This represents a slight deceleration from the 15.5 percent increase recorded in July.

Despite the headline miss, core inflation presents a more stubborn challenge for policymakers. Core consumer prices, which exclude volatile food and energy costs, jumped 3.4 percent annually in August.

This marks a sharp acceleration from the 2.6 percent rise seen in July and represents the fastest year-on-year increase since May 2023. The central bank has explicitly warned that this upward trend in underlying price pressure is likely to persist.

On a monthly basis, the consumer price index increased 0.2 percent in August, reversing a 0.2 percent decline in the previous month. This monthly gain also trailed the 0.3 percent rise anticipated by market analysts.

The mixed inflation data arrives just a week after the Bank of Korea implemented its second consecutive interest rate hike. The central bank remains focused on anchoring inflation expectations as price growth holds above target levels.

Financial stability risks continue to shape the monetary policy outlook. While the finance ministry projects that headline inflation will ease in the current month, persistent core pressures may limit the central bank's ability to pivot toward rate cuts in the near term.