Administrative Decentralization Brief: Local Autonomy Reform Progress and Obstacles

Intelligence Brief | 2030 Seoul Plan Monitoring Series | March 2026

Executive Summary

South Korea remains one of the most centralized democracies in the OECD. The national government in Sejong City controls approximately 76% of total public revenue and 62% of total public expenditure, leaving metropolitan and municipal governments, including Seoul, dependent on central transfers for a significant portion of their operating budgets. This centralization directly constrains the 2030 Seoul Plan’s implementation capacity, as many of the plan’s objectives in housing, transport, and social services require fiscal flexibility and regulatory authority that the Seoul Metropolitan Government does not fully possess. This brief assesses the current state of decentralization reform, evaluates the Sejong City government relocation experiment, examines fiscal devolution progress, and identifies the obstacles that continue to impede meaningful local autonomy in Korea’s governance architecture.

Korea’s Centralization: Historical and Structural Context

Korea’s hyper-centralized governance structure is a legacy of the developmental state model that drove industrialization from the 1960s through the 1990s. Under military-era presidents Park Chung-hee (1961-1979) and Chun Doo-hwan (1980-1988), local autonomy was suspended entirely, with all provincial and municipal executives appointed by the central government. Local elections were restored in 1991 (council elections) and 1995 (executive elections), but the restoration of democratic local government was not accompanied by commensurate fiscal or regulatory devolution.

The gap between Korea’s sub-national revenue share (24%) and expenditure share (38%) is bridged by intergovernmental transfers, principally the Local Share Tax (jibanggyobuse), which distributes 19.24% of national tax revenue to local governments through a formula based on population, fiscal capacity, and expenditure need. This transfer dependency means that Seoul’s fiscal capacity is partially determined by national policy decisions over which the metropolitan government has limited influence.

The Seoul Metropolitan Government: Fiscal Profile

Seoul’s fiscal position is distinctive within Korea’s local government system. As the only municipality generating sufficient own-source revenue to be a net contributor to the national equalization system, Seoul occupies an ambiguous position: the wealthiest local government in Korea, yet constrained by the same centralized governance framework as municipalities with a fraction of its fiscal capacity.

Seoul’s 52.8% own-source revenue ratio is the highest among Korean local governments but low by international standards for capital cities (Tokyo: 72%, London: 68%, New York City: 61%). The 47.2% of revenue that comes through transfers or earmarked grants constrains Seoul’s ability to allocate resources according to metropolitan priorities rather than national program requirements.

Expenditure Constraints

The expenditure side reveals further constraints. Approximately 38% of Seoul’s budget is consumed by nationally mandated programs (welfare payments, education subsidies, health insurance contributions) over which the metropolitan government has minimal discretion regarding benefit levels, eligibility criteria, or delivery mechanisms. This “mandatory spending” share has grown from 29% in 2015, reflecting the expansion of national welfare programs that local governments must co-fund.

The Seoul Metropolitan Government’s discretionary budget, the portion it can allocate according to its own policy priorities, amounts to approximately KRW 18-20 trillion, or 38-43% of total expenditure. This is the fiscal space within which the 2030 Seoul Plan must operate, and it is insufficient for the scale of intervention required to address the metropolitan area’s housing, demographic, and infrastructure challenges simultaneously.

Decentralization Reform: The Moon and Yoon Administrations

The Moon Jae-in administration (2017-2022) made decentralization a stated priority, establishing the Presidential Committee on Autonomy and Decentralization and proposing a constitutional amendment to strengthen local government autonomy. The Yoon Suk-yeol administration (2022-present) has continued decentralization rhetoric but with different emphasis, focusing on deregulation and local economic development rather than fiscal devolution.

Key Reform Measures (2017-2026)

The most significant structural reform, a constitutional amendment explicitly guaranteeing local government autonomy and fiscal rights, failed in 2018 when the National Assembly could not achieve the two-thirds supermajority required for constitutional revision. Without constitutional protection, local government authority in Korea remains a product of national legislation that can be expanded or contracted by simple majority vote, creating permanent institutional insecurity for metropolitan planning.

The Sejong City Experiment

The relocation of government ministries from Seoul to Sejong Administrative Capital represents Korea’s most ambitious decentralization initiative. Designated in 2007 and receiving its first ministry relocations in 2012, Sejong City was designed to reduce Seoul’s political and administrative dominance while catalyzing development in the Chungcheong region.

The Sejong experiment has achieved its physical relocation targets but has fallen short on the qualitative goals of creating a functionally independent administrative capital. Critical problems persist.

Split governance. The President, National Assembly, Supreme Court, and Constitutional Court remain in Seoul, creating a bifurcated governance system where senior civil servants must frequently travel between Sejong and Seoul (140 km, approximately 2 hours by road). This “KTX governance” pattern consumes approximately 420,000 person-hours annually in commuting time, estimated at KRW 280 billion in productivity loss.

Social infrastructure deficit. Sejong City lacks the cultural, educational, and social amenities of Seoul. International schools, specialized medical facilities, entertainment venues, and the dense social networks that support professional life in the capital are absent or limited. Civil servant satisfaction surveys show 41% reporting that they would prefer to return to Seoul, citing family separation, spouse employment constraints, and children’s education as primary concerns.

Private sector reluctance. The target of 50,000 private sector jobs has reached only 56.8% completion. Companies cite distance from decision-makers (who remain partly in Seoul), limited talent pool, and insufficient urban amenities as barriers to relocation. The result is a government town with limited economic diversification.

District-Level Autonomy: Seoul’s 25 Gu

Within Seoul, the 25 autonomous districts (gu) operate as a secondary tier of local government with their own elected mayors and councils. The districts have jurisdiction over local service delivery (waste collection, street maintenance, community welfare, park management) but limited fiscal and regulatory authority.

The fiscal disparity across Seoul’s districts is pronounced. Gangnam-gu generates 48% of its budget from own-source revenue and has a fiscal capacity index of 1.86, while Nowon-gu generates only 12% and has an index of 0.42. This disparity translates directly into service quality differences: per-capita spending on parks, cultural programs, and infrastructure maintenance varies by a factor of 2.5 across districts. The 2030 Seoul Plan’s equity objectives require addressing this intra-metropolitan fiscal inequality, but the current transfer system provides only partial equalization.

International Comparative Context

Korea’s centralization stands out even among East Asian comparators with similar developmental state histories.

Japan’s experience is particularly relevant. Japan underwent comprehensive decentralization reform through the 1999 Decentralization Promotion Act, which eliminated the “agency delegated function” system that had made local governments administrative agents of the national government. Korea’s current governance architecture resembles Japan’s pre-1999 system more closely than its post-reform framework. Japan’s reform, while imperfect, is credited with enabling greater policy innovation at the prefectural and municipal levels, including Tokyo’s pioneering cap-and-trade emissions program and Yokohama’s integrated elderly care model.

Implications for the 2030 Seoul Plan

The centralization constraint affects every dimension of the 2030 Seoul Plan.

Housing policy. Loan-to-value ratios, comprehensive real estate tax rates, land use designation authority, and building code standards are all set at the national level. Seoul can supplement national programs but cannot independently restructure the regulatory or fiscal framework governing its housing market. The housing crisis analysis in this series documents the consequences of this constraint.

Transport investment. Major infrastructure projects like GTX require national budget approval and implementation through national agencies (Korea Rail Network Authority). Seoul’s ability to prioritize, sequence, and design metropolitan transit investments is mediated through national decision-making processes.

Demographic response. The national government controls immigration policy, pension system parameters, and the bulk of pronatalist spending. Seoul can operate supplementary programs but cannot independently adjust the most powerful policy levers affecting population trajectory.

Fiscal sustainability. The growing share of nationally mandated welfare spending in Seoul’s budget (30.2% and rising) crowds out discretionary investment in infrastructure, innovation, and adaptation. Without greater fiscal autonomy, Seoul faces a structural squeeze between expanding obligations and constrained revenue authority.

Risk Assessment

Constitutional inertia (high). The failure of the 2018 constitutional amendment means that meaningful decentralization requires either a future constitutional revision (requiring two-thirds supermajority and a national referendum) or incremental legislative reform that is inherently vulnerable to reversal. Neither pathway is likely to produce transformative change within the 2030 planning horizon.

Fiscal squeeze (high). The combination of demographic revenue erosion (shrinking working-age tax base) and expanding mandatory spending obligations creates a structural deficit that will increasingly constrain Seoul’s discretionary fiscal capacity. The Seoul Institute projects that the mandatory spending share will reach 45% by 2030 under current national policy trajectories.

Political resistance (medium-high). Decentralization threatens the bureaucratic interests of national ministry officials, the political leverage of National Assembly members who distribute earmarked funds, and the ideological preferences of centralization advocates who view uniform national standards as essential to equity. This coalition of resistance has consistently diluted decentralization proposals.

Special Metropolitan Union: A Partial Solution

The 2022 Special Metropolitan Union legislation created a new cooperative governance mechanism that allows Seoul, Incheon, and Gyeonggi Province to jointly manage cross-boundary issues, including transportation, housing supply coordination, environmental management, and emergency response, without requiring formal governmental merger. As of 2026, the Union has established four working committees.

The Special Metropolitan Union represents a pragmatic adaptation to centralization constraints. Rather than waiting for constitutional reform, it enables horizontal coordination among metropolitan governments within the existing legal framework. However, its voluntary nature means that participation and compliance depend on the political alignment of three independently elected administrations, a condition that cannot be guaranteed across electoral cycles.

The Union’s budget of KRW 96 billion is modest relative to the combined budgets of its three member jurisdictions (approximately KRW 120 trillion), reflecting its coordinating rather than executing function. Expanding the Union’s authority and resources would require either legislative amendment or voluntary agreement among the member governments, both of which face political constraints.

Recommendation

Seoul’s strategy within the 2030 planning horizon should pursue two parallel tracks. First, maximize the use of existing discretionary fiscal and regulatory authority, including creative interpretation of enabling legislation, interjurisdictional cooperation through the Special Metropolitan Union framework, and strategic use of Seoul’s influence over the 25 autonomous districts. Second, build the political coalition for structural reform by producing rigorous evidence on the fiscal cost of centralization, proposing specific constitutional language for a future amendment opportunity, and aligning with other major metropolitan governments (Busan, Incheon, Daegu) that share the interest in expanded local autonomy. The governance reform dashboard should track both incremental progress and structural reform indicators to maintain accountability.