South Korea’s consumer price index rose 3.1 per cent in August, distorted by an end to historical mobile billing discounts, according to the Ministry of Economy and Finance.
Excluding the sharp rebound in telecommunications charges, consumer inflation ran at an estimated 2.5 per cent for the month. The gap stems directly from base effects created 12 months earlier, when SK Telecom rolled out widespread customer discounts.
Base Effects and Mobile Charges
Mobile phone service charges jumped 26.7 per cent in August compared to the same period last year. That spike reflects an abnormal comparison point in August 2025, when SK Telecom halved subscriber bills following a cyber security breach that compromised records for more than 20 million users.
“In August last year, there was a temporary 50-percent discount in mobile bills, which served as a base effect, leading to a 3.1 percent rise in consumer prices this month,” said Kang Gi-lyong, a senior financial official, during a government meeting in Seoul.
The return to normal tariff collections across the country’s primary wireless network added 0.6 percentage points directly to the headline inflation reading.
Energy Caps and Holiday Pressures
State market interventions also altered headline price dynamics across other consumer categories. South Korea’s active fuel price cap trimmed an estimated 0.5 percentage points off total consumer price growth, keeping the August index below an unmitigated 3.6 per cent.
For consumer brands and retailers, the underlying 2.5 per cent rate reflects a clearer picture of domestic demand than the headline figure suggests. Household purchasing power across major metropolitan areas remains tight, but spending on staples and discretionary services has stabilized as core price growth cools.
Government economic planners expect overall consumer price pressures to moderate further during September. Officials are preparing support packages to keep food and household goods prices stable ahead of the Chuseok holiday shopping period.
