South Korea announced its most aggressive fiscal spending plan ever on Tuesday, setting total government expenditure at 821 trillion won (approximately $596.92 billion) for 2027, aiming to strengthen the nation's technological edge in the global artificial intelligence race. The spending plan marks a 12.8% increase from 2026, the largest year-on-year jump on record, according to the budget ministry's annual proposal. This initiative signals a major policy shift for Asia's fourth-largest economy under President Lee Jae-myung, who has championed expansionary fiscal policy since taking office last June, breaking from his predecessor's three-year austerity approach.

The semiconductor boom is providing the fiscal firepower for this historic spending surge. Excess tax revenue from South Korea's chip industry is driving the record expenditure growth. The global AI infrastructure boom has ignited demand for high-bandwidth memory, delivering unprecedented profits to the nation's memory chip titans, Samsung Electronics and SK Hynix. Total tax revenue is projected to jump 40.7% next year to 584.4 trillion won, with corporate tax income expected to double to 216.7 trillion won. This revenue surge is expected to help cut the nation's debt-to-GDP ratio by 3.3 percentage points to 48.3%, down from this year's projected 51.6%.

The reduction in fiscal consolidation fell short of market expectations, causing Korean government bond yields to rise rather than fall. Part of the excess tax revenue will be used to reduce government borrowing. Total government bond issuance next year will decline to 222.8 trillion won from this year's budgeted 225.7 trillion won. Net bond issuance, reflecting new sovereign debt, will drop sharply by 13.1 trillion won to 96.3 trillion won, down from this year's 109.4 trillion won. Despite this, the 10-year Korean government bond yield still climbed 6.5 basis points to 4.378% after the budget announcement, indicating that markets had anticipated even deeper cuts to bond issuance amid a global bond selloff. "It would have been more favorable to the market if the government had cut bond issuance more aggressively," said Kong Dong-rak, an analyst at Daishin Securities. He added that domestic bond yields have been climbing amid the global long-duration bond selloff. "It's also good that the net issuance plan is declining. Some adjustments to reduce long-term debt allocation would help stabilize the local bond market," he noted.

The government plans to channel an estimated 162.3 trillion won in excess tax revenue into a strategic endowment fund called the "Future Response Fund," rather than spending it on short-term programs. The fund is designed for long-term investment. Next year, the fund will deploy 45.4 trillion won toward expanding youth welfare, future growth engines, and specialized education projects. A key spending priority for 2027 will be supporting next-generation semiconductor infrastructure. The government has allocated 21.3 trillion won for industrial water systems, power grids, and logistics networks to bolster chip manufacturing capabilities and drive critical technology infrastructure development. Additionally, 2.6 trillion won has been earmarked as a dedicated semiconductor budget. The government is also proposing 3.4 trillion won in spending for nuclear-powered submarine projects and other strategic weapons systems.

The budget proposal still requires parliamentary approval. President Lee noted on Tuesday that the Korean economy is at a point where rate hikes are inevitable, which could pressure economic growth as vulnerable households face higher borrowing costs. With the semiconductor boom intensifying inflation risks, the Bank of Korea raised its benchmark rate by 25 basis points to 3.00% at the end of August, marking the first back-to-back rate increase since January 2023. Central bank governor Rhee Chang-yong stated that consecutive hikes are not standard practice but rather a "strong signal." He anticipates gradual rate increases over the next six months.