What is horizontal accountability in a democratic system?

In the context of political science and public administration, horizontal accountability refers to the capacity of various state institutions to check, monitor, and oversee the actions of other branches of government.1

Unlike vertical accountability, which involves citizens holding officials accountable through mechanisms like elections, horizontal accountability operates through a system of checks and balances performed by nonmajoritarian institutions. These institutions—such as the judiciary, audit agencies, and ombudsmen—are designed to ensure that political power is exercised within the bounds of the law and to curb corruption or abuse of authority.123

Key characteristics of horizontal accountability include:

• Institutional Oversight: It relies on the formal, procedural operations of state agencies rather than direct electoral judgment.1
• Rule of Law: It is fundamentally linked to the protection of individual rights and the maintenance of legal standards across the public sector.1
• Independence: Its effectiveness often depends on the autonomy of these oversight bodies from the political power they are intended to monitor.3

By distributing power and providing mechanisms for mutual oversight, horizontal accountability serves as a critical component in ensuring the quality and integrity of a democratic system.1