South Korea’s 2027 budget and fiscal outlook Report Interpretation

Overview

Goldman Sachs reviews South Korea’s proposed 2027 budget, emphasizing a substantial fiscal-balance improvement driven by tax revenue, a large increase in public expenditure, and a moderate decline in Korean Treasury Bond issuance. The report sees further potential upside to its 2027 growth forecast from the fiscal impulse, while noting that the planned Future Response Fund absorbs much of the revenue windfall and constrains the reduction in bond supply.

Core views

The Ministry of Planning and Budget’s proposed 2027 budget projects a marked improvement in South Korea’s public finances. The consolidated budget balance is expected to move from a deficit of 1.9% of GDP in 2026 to a KRW59.9trn surplus, equivalent to 1.9% of GDP, in 2027—the first surplus since 2018, based on the MPB’s nominal-GDP projection. The managed fiscal deficit, which excludes social-security-fund surpluses from the consolidated balance, is projected to narrow from 3.8% of GDP to 0.1%. Goldman Sachs notes that this is a significant improvement not only from 2026 but also from the government’s prior-year projection of a deficit around 4% of GDP. The fiscal improvement is driven primarily by revenue rather than spending restraint. Government expenditure is planned to rise at a historic 12.8% pace to KRW821trn in 2027. General-government spending, including local tax allocations and public administration, is set to increase by KRW27.6trn and account for roughly 30% of the headline expenditure increase. Healthcare, welfare, labor and education spending is collectively expected to rise by KRW35.4trn, contributing roughly 40% of the sequential increase, while R&D and industry-support spending represents a more moderate 15% of the increase. Goldman Sachs estimates that stronger expenditure could generate a fiscal impulse of 1.0 percentage point to headline GDP growth. Its existing 2027 GDP forecast already incorporates about 0.7pp, leaving roughly 0.3pp of additional potential upside from government spending. Revenue is projected to increase even faster, rising 30.4% to KRW880.8trn; the increase from 2026 would be about twice the increase in expenditure. Tax revenue is expected to rise 49.8% to KRW584.4trn and accounts for almost all of the projected improvement. The report identifies excess tax revenue—defined as revenue growth above the previous ten-year average—as the key source of funding for the newly created Future Response Fund (FRF). Excess tax receipts are projected at KRW162.3trn, mostly from semiconductor corporate-tax income. Of the FRF allocation, KRW52.9trn is directed to four major policy areas, including KRW45.4trn earmarked for 2027 spending and the remainder retained as reserves within those accounts. A further KRW109.4trn goes to a general account, including KRW12.5trn used to reduce new KTB issuance. In total, KRW104.4trn—3.3% of projected nominal GDP—is reserved for future use, likely beyond 2027. The government also retains flexibility under proposed fiscal rules to raise spending by up to 30% without National Assembly approval for a supplementary budget. KTB issuance is therefore expected to fall only moderately despite the much sharper improvement in the managed deficit. Gross issuance is planned to decline by KRW2.9trn to KRW222.8trn, about 7% of projected nominal GDP, while net issuance is set to fall by KRW13.1trn to KRW96.3trn. Goldman Sachs attributes the comparatively small reduction in bond supply to the funding needs associated with the FRF. Over the medium term, the government projects managed fiscal deficits to widen again, but to remain within 3% of GDP. For 2026–2030, revenues are projected to grow by an average 9.9% annually, versus 8.4% for expenditure. The projected deficits remain materially below the prior-year projections around 4% of GDP. Consequently, government debt is expected to fall to 48.3% of GDP in 2027 and remain below 50% through 2030, also below previously projected levels.

Analysis framework

The report compares the proposed 2027 budget with 2026 outcomes and prior government projections, separates the consolidated balance from the managed fiscal deficit, and traces the revenue windfall through expenditure plans, FRF allocations and KTB funding needs. It then estimates the fiscal impulse to GDP growth and reviews the government’s medium-term deficit, revenue, expenditure and debt projections.

Methodology notes

• Macroeconomics

  Fiscal impulse analysis

  Goldman Sachs estimates how the planned increase in government expenditure could affect headline GDP growth, calculating a 1.0pp fiscal impulse and comparing it with the 0.7pp already embedded in its forecast.

• Other

  Government bond supply assessment

  The report links fiscal balances and FRF funding requirements to planned gross and net KTB issuance, explaining why bond supply falls less than the improvement in the managed fiscal deficit.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Korean Treasury Bonds (KTBs)

  Planned government bond supply is linked to the budget balance and FRF funding structure.

  Strengths

  Net issuance is projected to fall by KRW13.1trn in 2027.

  Weaknesses

  The issuance reduction is much smaller than the improvement in the managed fiscal deficit.

  Comparison

  Gross issuance falls by KRW2.9trn to KRW222.8trn, while net issuance falls to KRW96.3trn.

  Risks

  FRF funding needs limit the decline in KTB supply.

Key data

• Consolidated budget balance, 2027KRW59.9trn, 1.9% of GDPProjected surplus versus a 1.9% of GDP deficit in 2026; first surplus since 2018.
• Managed fiscal deficit0.1% of GDP in 2027Projected to narrow from 3.8% of GDP in 2026.
• Government expenditureKRW821trnPlanned 12.8% increase in 2027.
• Government revenueKRW880.8trnProjected 30.4% increase in 2027.
• Tax revenueKRW584.4trnProjected 49.8% increase, driving most of the fiscal improvement.
• Potential incremental GDP-growth upsideroughly 0.3ppGoldman Sachs estimates a 1.0pp fiscal impulse, of which roughly 0.7pp is already in its 2027 GDP forecast.
• FRF excess tax-revenue fundingKRW162.3trnMostly from semiconductor corporate-tax income.
• FRF spending in 2027KRW45.4trnPart of KRW52.9trn allocated to four major policy areas.
• FRF reserve for future useKRW104.4trn, 3.3% of GDPLikely to be used beyond 2027.
• Net KTB issuance, 2027KRW96.3trnPlanned decline of KRW13.1trn from 2026.
• Government debt, 202748.3% of GDPProjected to remain below 50% through 2030.

Impact & implications

The report indicates that the 2027 budget combines a large revenue-led fiscal improvement with expansionary expenditure that could lift growth beyond Goldman Sachs’ current forecast. For the KTB market, however, the reduction in planned issuance is moderate because a large share of excess revenue is allocated to the FRF rather than fully reducing financing needs. Medium-term fiscal projections imply lower deficits and debt than the government previously expected, despite deficits widening after 2027.