South Korea's headline inflation eased as expected in September, but core inflation excluding food and energy remained sticky, and semiconductor-driven exports hit a record monthly high, reinforcing market expectations that the Bank of Korea will resume rate hikes in November.

On Friday, October 2, data released by Statistics Korea showed the consumer price index rose 2.9% year-on-year in September, down from 3.1% in August and in line with the economists' median estimate of 2.9%. Core inflation came in at 2.8%, a marked decline from 3.4% in August, but still running in the mid-to-high range of the 2% band, indicating that underlying price pressures have not faded in step with falling energy costs.

Meanwhile, trade data released the same day showed exports more than doubled year-on-year to $120.9 billion in September, a record high. Semiconductor exports surged 263% to $60.3 billion, also setting a new record.

Analysts said this combination gives the Bank of Korea room to keep raising rates without hurting growth. Several economists expect the central bank to pause at its October meeting to assess the impact of two consecutive hikes, then resume tightening in November.

Core inflation stays sticky as transport prices lead gains

Although headline inflation fell below 3%, structural price pressures persist. Jeeho Yoon, an economist at BNP Paribas, said core inflation is still running in the mid-to-high range of the 2% band, making it difficult for the central bank to relax its guard.

By component, transport prices rose 7.7% year-on-year, the main driver of inflation. Recreation and culture prices rose 5.8%, restaurants and hotels rose 2.8%, and household goods and services rose 3%.

According to Yoon's analysis, elevated oil prices pushed up costs for items such as airfares, car repairs and package tours, while rising semiconductor prices are feeding through to electronics such as computers. Demand-side pressures are also present, with restaurant prices up 2.5% year-on-year, and the pass-through effect of future wage growth is another variable that needs close watching.

The Bank of Korea expects CPI to rise 2.7% this year and 2.3% in 2027, with core inflation holding at 2.5% in both years, still above the 2% target, meaning there is little room for rate cuts in the near term.

Record exports: semiconductor boom underpins the economy

September exports more than doubled year-on-year to $120.9 billion, a record high despite fewer working days that month. Semiconductor exports surged 263% to $60.3 billion, also a new record.

This export structure confirms the earlier judgment of Bank of Korea Governor Shin Hyun-song that South Korea's growth model is shifting from consumer electronics to AI infrastructure, with the benefits of semiconductor expansion flowing through corporate earnings, consumption and investment into the broader economy.

The strength of the chip cycle is also spilling over into public finances. Driven by semiconductor profits, special dividends from chip companies, a stronger stock market and a recovery in private consumption, South Korea's full-year tax revenue is expected to jump 28% year-on-year to a record 478.6 trillion won, about $352 billion.

This means that even if the central bank tightens monetary policy further, the economic foundation remains resilient enough to absorb the impact of higher rates, providing practical support for raising rates without harming growth.

Rate path: pause in October, resume in November

The Bank of Korea raised its benchmark rate twice in a row in July and August, bringing it to 3%. Policymakers have repeatedly warned that strong growth, persistent inflation and rising home prices could require further increases in borrowing costs.

The median six-month rate forecast published in August was 3.25%, implying room for one more hike. Governor Shin said at the time that the figure pointed to a gradual pace of tightening.

Economist Hyosung Kwon noted that with inflation staying sticky and the export surge supporting growth, the Bank of Korea needs to raise rates further. Kwon expects the central bank to pause in October to manage the pace of tightening after two consecutive hikes, and resume in November.

Next, the market will focus on the October central bank meeting and subsequent inflation and export data for further guidance on the timing of rate hikes.