Most and Least Corrupt Countries in the World (2025)

Corruption is not a minor governance inconvenience. It is one of the most efficient mechanisms ever devised for transferring wealth from the public to private hands. When a building inspector accepts a bribe to sign off on substandard construction, when a procurement officer awards a government contract to the wrong bidder in exchange for a kickback, when a police officer demands payment to return stolen property — the immediate damage is financial. The downstream damage is structural: institutions lose credibility, citizens stop trusting government, competent people avoid public service, and economic activity migrates to informal channels where contracts cannot be enforced. Corruption kills economic development before it starts.

Transparency International's Corruption Perceptions Index (CPI), published annually since 1995, is the most widely cited global measurement of public sector corruption. It aggregates data from 13 independent institutions — including the World Bank, African Development Bank, World Economic Forum, and Bertelsmann Foundation — and scores countries from 0 (highly corrupt) to 100 (very clean). The 2024 CPI, released in early 2025, assessed 180 countries. This article uses the 2024 results throughout.

How the CPI Is Measured — and Its Limits

The CPI is a composite index of expert assessments and surveys of business executives. It measures perceptions of public sector corruption — specifically bribery of public officials, kickbacks in public procurement, embezzlement of public funds, and the strength of anti-corruption frameworks.

What it does not measure: private sector corruption between businesses, petty bribery in everyday citizen interactions (though these are captured in some sub-indices), or hidden financial flows and tax evasion by wealthy individuals and corporations. A country can score well on the CPI while harboring significant financial secrecy — Switzerland and Luxembourg, both with high CPI scores, are also significant offshore financial centers.

The "perceptions" framing is a genuine limitation. Countries with highly active investigative journalism may appear more corrupt in surveys (scandals are more visible) than countries with restricted media where corruption is equally present but less reported. The CPI is best understood as capturing the institutionalized corruption environment faced by businesses and professionals, not as a complete picture of corruption in society.

Source: Transparency International, Corruption Perceptions Index 2024 methodology — transparency.org

The World Bank Worldwide Governance Indicators (WGI) provide a complementary measure — "Control of Corruption" — based on different data sources. Countries that score well on both CPI and WGI provide the most reliable signal of genuinely low corruption.

Top 20 Cleanest Countries (Highest CPI Scores, 2024)

Rank	Country	CPI Score	Region	Notes
1	Denmark	90	Northern Europe	Perennial leader
2	Finland	87	Northern Europe	Transparent procurement
3	Singapore	84	Southeast Asia	Uniquely clean for region
4	New Zealand	83	Oceania	Strong rule of law
5	Luxembourg	82	Western Europe	—
6	Norway	81	Northern Europe	Oil fund transparency
7	Switzerland	81	Western Europe	—
8	Sweden	80	Northern Europe	—
9	Netherlands	78	Western Europe	—
10	Iceland	72	Northern Europe	Post-banking crisis recovery
11	Germany	75	Western Europe	—
12	Ireland	74	Western Europe	—
13	Estonia	74	Northern Europe	Top performer in Eastern Europe
14	Canada	75	North America	—
15	Australia	71	Oceania	—
16	UK	71	Western Europe	Modest recent decline
17	Austria	71	Western Europe	—
18	Japan	73	East Asia	—
19	Belgium	73	Western Europe	—
20	USA	65	North America	Declining from 73 in 2015

Source: Transparency International CPI 2024 — transparency.org/en/cpi/2024

Where this data comes from

Transparency International's Corruption Perceptions Index aggregates assessments from 13 independent institutions: the World Bank's Worldwide Governance Indicators, the World Economic Forum's Executive Opinion Survey, the Bertelsmann Foundation's Transformation Index, and the African, Asian, and Inter-American Development Banks' institutional assessments. Each source surveys experts and business leaders on perceived levels of public sector corruption — specifically bribery, embezzlement, procurement fraud, and the strength of anti-corruption institutions. Scores range from 0–100, with higher scores indicating lower perceived corruption. The methodology measures perceptions of institutional corruption visible to professionals and businesses, not direct corruption measurement or private-sector fraud. Countries with strong investigative journalism may score lower (corruption scandals are reported) than countries with censored media where corruption is equally present but unreported.

Analytical insight: governance quality and enforcement, not wealth, predict corruption

The CPI reveals that corruption control depends primarily on institutional strength and enforcement rather than national wealth. The top performers (Nordic countries, Singapore, New Zealand) share common characteristics: independent judiciaries with power to prosecute elites, free press with investigative capacity, competitive multiparty systems where scandals produce real political consequences, and civil services with competitive compensation reducing bribery incentive. Conversely, some oil-rich nations (Equatorial Guinea, Venezuela, Nigeria) rank among the most corrupt despite substantial resources, showing that resource wealth without institutional constraints often enables rather than prevents corruption. The US decline from 73 to 65 (2015–2024) reflects rising institutional distrust and political polarisation, not necessarily increased actual corruption. Singapore's high score despite authoritarian governance demonstrates that one-party systems with strong meritocratic bureaucracies and harsh anti-corruption enforcement can achieve low corruption outcomes independent of democracy. This evidence suggests corruption is fundamentally a governance design problem — fixable through institutional reform — rather than a cultural inevitability.

20 Most Corrupt Countries (Lowest CPI Scores, 2024)

Rank (from bottom)	Country	CPI Score	Primary Corruption Driver
1 (most corrupt)	South Sudan	8	Oil revenue theft, warlord capture
2	Somalia	9	State fragility, armed faction capture
3	Venezuela	10	Narco-state, state enterprise looting
4	Syria	13	War economy, regime extraction
5	Yemen	14	Wartime fragmentation
6	Libya	14	Post-Gaddafi fragmentation
7	North Korea	17	Total state kleptocracy
8	Haiti	17	Gang-state overlap
9	Equatorial Guinea	17	Oil-family extraction
10	Nicaragua	14	Ortega family state capture
11	Burundi	18	Patronage system
12	DRC	20	Mineral resource looting
13	Chad	20	Elite oil capture
14	Sudan	20	Military-commercial complex
15	Turkmenistan	18	Authoritarian gas-state
16	Eritrea	22	One-party isolation
17	Myanmar	20	Military junta extraction
18	Afghanistan	20	Taliban informal economy
19	Cambodia	22	Hun Sen patronage system
20	Tajikistan	20	Presidential family enterprises

Source: Transparency International CPI 2024

Source: Transparency International, CPI 2024 Full Results — transparency.org/en/publications/corruption-perceptions-index-2024

Historical Context: How Corruption Became Measurable

For most of recorded history, corruption was simply called governance. Medieval European feudalism, Imperial Chinese bureaucracy, Ottoman administration, and colonial extraction were all systems where the private enrichment of public officials was not merely tolerated but structurally embedded. The idea that public office should be exercised in the public interest — rather than the officeholder's personal interest — is a relatively recent political development, consolidated in Western Europe and North America only in the 19th century.

The professionalization of civil services in Britain (Northcote-Trevelyan Report, 1854), the United States (Pendleton Civil Service Reform Act, 1883), and Germany under Bismarck replaced patronage appointment with merit-based hiring, creating career bureaucrats whose advancement depended on performance rather than political connections. This transition did not eliminate corruption but changed its structure and reduced its frequency.

The post-WWII international development project largely ignored corruption for its first four decades. The World Bank and IMF explicitly avoided using the word — arguing that characterizing corruption as a development obstacle was culturally imperialist. This position changed in the 1990s, partly driven by accumulating evidence that aid money was being diverted to personal enrichment, and partly by Transparency International's founding in 1993 and the launch of the CPI in 1995. The CPI made corruption internationally comparable and politically discussable in ways that previous silence had prevented.

The 1997 OECD Anti-Bribery Convention — requiring signatory countries to criminalize the bribery of foreign public officials by domestic companies — was a landmark. For the first time, wealthy-country companies could not legally pay bribes to win overseas contracts and write them off as business expenses. Enforcement has been uneven, but the legal framework changed the calculus for multinational corporations.

Why the Nordic Nations Are So Clean

Denmark's perennial leadership in the CPI — it has scored 88 or above every year since 2011 — reflects a combination of institutional design, historical development, and social norms that reinforce each other in ways that make corruption both logistically difficult and culturally unacceptable.

Transparency as default. Danish public procurement, government contracting, and bureaucratic decision-making operate under the Access to Public Administration Files Act, which gives citizens broad rights to examine government documents. Every civil servant's salary is publicly discoverable. Parliamentary proceedings are fully recorded and accessible. The default is openness; secrecy requires active justification.

Well-compensated civil service. Danish public servants earn salaries competitive with private sector equivalents at comparable qualification levels. A senior Danish customs official or procurement officer earns enough that the risk-reward calculation for accepting a bribe is fundamentally different from the calculation facing a similarly positioned official in a country with a low-wage public sector. When the bribe you're offered represents one week's salary rather than one year's salary, the calculus changes entirely.

Independent institutions. Denmark's judiciary, state prosecutor, media, and civil society operate with genuine independence from executive power. Politicians have been prosecuted; journalists publish findings that embarrass the government; civil society organizations actively monitor public contracts. No single institution is the sole check on corruption; they reinforce each other.

High-trust culture. Nordic societies consistently score at the top of global social trust surveys — the proportion of citizens who believe "most people can be trusted" is around 70–75% in Denmark and Finland, compared to 20–30% in many Southern and Eastern European countries. Trust and corruption are inversely related: where people believe institutions are honest, corruption is harder to rationalize and easier to sanction. The mechanism is self-reinforcing: honest institutions produce high trust; high trust produces social sanctions for dishonest behavior; social sanctions reduce corruption; reduced corruption maintains honest institutions.

Source: World Values Survey, Wave 7 (2017–2022) — social trust data by country. worldvaluessurvey.org

Singapore: Engineering Anti-Corruption

Singapore's CPI score of 84 makes it the least corrupt country in Southeast Asia by a wide margin — in a region where most countries score below 40. The achievement is more remarkable for being built within living memory from a starting point of endemic corruption.

When Lee Kuan Yew's People's Action Party came to power in 1959, Singapore was a developing port city where corruption pervaded the police force, licensing agencies, and customs. The anti-corruption campaign combined three elements: severe penalties (prison sentences of up to five years for bribery, with no distinction between public and private sector, and no leniency for seniority — Lee Kuan Yew explicitly had senior officials investigated and prosecuted, including personal acquaintances); generous civil service compensation (Singapore civil servants are among the highest-paid in the world — a cabinet minister earns more than the US President); and an activist anti-corruption agency, the Corrupt Practices Investigation Bureau (CPIB), with genuine independence and the authority to investigate any person or organization.

The model works by removing the financial pressure that drives petty corruption (high salaries), removing the impunity that enables grand corruption (independent prosecution), and making the costs of corruption — career destruction, imprisonment, public shame — real rather than theoretical.

Singapore's approach has been widely studied but rarely replicated, in part because it pairs anti-corruption effectiveness with restricted political competition and press freedom. The PAP has governed Singapore without interruption since 1959, and Singapore ranks low on press freedom indices. Whether anti-corruption effectiveness requires authoritarian governance or whether Singapore's model could be adapted to democratic contexts is genuinely contested.

The Cost of Corruption: Evidence from the Data

Corruption is not simply a moral failure. It has measurable economic costs that researchers have now quantified across multiple data sets.

GDP effects. A meta-analysis of over 400 cross-country studies finds that countries which improve their CPI score by 10 points see GDP growth rates increase by approximately 3–4% in subsequent years. The mechanism runs through multiple channels: reduced FDI (foreign investors prefer lower-corruption environments), misallocated public investment (spending on projects chosen for kickback potential rather than economic value), and reduced private sector investment (businesses spend resources on bribery rather than productive activity).

Investment flows. Each 1-point improvement in CPI score is associated with approximately 1% additional FDI inflows, according to World Bank research. For a country moving from a score of 30 to 40 — equivalent to a major anti-corruption reform effort — this represents very substantial additional investment.

Healthcare and education. Cross-country analysis consistently finds that public health and education outcomes are worse in more corrupt countries even after controlling for income. The mechanism is procurement corruption: in countries where building inspectors, medical supply purchasers, and textbook procurement officers can be bribed, the quality of hospitals, schools, and their supplies is compromised. Medicines are diverted. School buildings are built below standard. Teacher hiring reflects connections rather than qualifications.

The total cost. The World Bank estimates that approximately $1 trillion in bribes is paid annually worldwide. Total economic cost — including foregone investment, misallocated resources, and growth foregone due to poor institutional quality — is estimated at $2.6 trillion annually, approximately 5% of global GDP.

Source: World Bank (2023), "World Development Report: Sovereignty and the State" — worldbank.org; Transparency International, "Corruption and Climate" 2024 report.

Surprises and Counterintuitive Findings

The USA at 65 and falling. The United States scored 73 in 2015 and has declined to 65 in the 2024 index. The decline reflects expert assessments of weakening oversight institutions, conflicts of interest in government contracting, political interference in prosecution, and what survey respondents describe as declining norms around public officeholders' personal enrichment. The US remains a high-income, institutionally complex country and 65 is far above the global median of 43 — but the directional trend is notable for a country that positions itself as a governance standard-setter.

Estonia at 74, leading Eastern Europe. Estonia's high score reflects a combination of aggressive digitization of government (reducing the human discretionary moments where bribes can be offered), a highly educated public that expects institutional accountability, and active civil society monitoring. Estonia's performance is particularly notable given that it emerged from Soviet rule in 1991 — a system defined by pervasive bribery and informal economy — and transformed its governance framework within a generation.

Saudi Arabia at 56, outperforming many European states. Saudi Arabia's CPI score reflects the Vision 2030 reform program's anti-corruption campaign — which has included the prosecution of hundreds of senior officials and business figures, including princes, in 2017's Ritz-Carlton episode. The campaign was conducted without due process and conflated anti-corruption enforcement with elimination of political competition, raising questions about its nature. But it produced measurable changes in business environment survey responses that lifted the Saudi score.

Russia at 22. Russia's score reflects a system described by experts as state capture — where the distinction between government and organized crime has effectively dissolved at senior levels. The oligarchy system created in the 1990s, sustained and consolidated under Putin, represents one of the largest instances of systematic public asset privatization to private connected interests in modern history. The estimated personal wealth of Russian oligarchs with political connections — much of it held offshore — runs to hundreds of billions of dollars.

Deep Dive: The Resource Curse and Corruption

Some of the world's most corrupt countries — South Sudan, Equatorial Guinea, the DRC, Chad, Libya, Venezuela — sit atop substantial natural resource wealth. This correlation is not coincidental. It reflects the "resource curse" — the empirically well-documented finding that countries with abundant natural resources, particularly oil and minerals, tend to have worse governance outcomes than comparable countries without resources.

The mechanism is straightforward. When government revenues come from resource extraction rather than taxation, the accountability link between citizens and government is severed. Governments that must tax their citizens to fund operations face demands for services and accountability in exchange for taxes. Governments that receive revenue from oil companies face no such pressure — they can fund operations, patronage networks, and security forces entirely from resource rents, without needing citizen buy-in. The result is governments that are responsive to resource-extraction interests and indifferent to citizen welfare.

Equatorial Guinea is the extreme case. The country discovered offshore oil in 1995 and is now one of Africa's largest oil producers per capita. GDP per capita has risen to over $8,000 — above the continental average. Yet life expectancy is 58 years, infant mortality remains very high, and the country consistently scores near the bottom of the CPI at 17. The Obiang family has governed since 1979 and is estimated to have extracted hundreds of millions of dollars in personal wealth from state oil revenues. The oil money has not become schools or hospitals; it has become Swiss bank accounts and luxury properties in Paris and Malibu.

Norway provides the deliberate contrast. Norway discovered oil in the 1960s — when its governance institutions were already strong — and created the Government Pension Fund Global (the "Oil Fund") to sequester resource revenues from the immediate budget. The fund now holds over $1.7 trillion in assets and is governed by transparent rules preventing politicians from spending principal. Norway's CPI score of 81 reflects institutions that were strong enough to absorb resource wealth without being captured by it.

Source: Mehlum, Moene & Torvik (2006), "Institutions and the Resource Curse," The Economic Journal. Ross (2012), "The Oil Curse," Princeton University Press.

The Kafala-Adjacent Problem: Institutional Corruption in Migrant Labor Systems

The CPI's focus on public sector corruption misses one significant category of institutional exploitation: labor rights violations against migrant workers in Gulf states. Qatar, UAE, Kuwait, and Bahrain all score relatively modestly on the CPI (Qatar 58, UAE 68) — not because government officials are uniformly corrupt in the bribery sense, but because the kafala (sponsorship) system that governs migrant labor creates legally sanctioned conditions of exploitation.

Under kafala, migrant workers' legal status depends entirely on their employer. Workers who leave an employer before contract completion can be prosecuted for "absconding." Workers who complain about non-payment of wages risk deportation. Recruitment agencies in source countries charge workers fees that create debt bondage before workers even arrive. The system is not illegal within those countries' frameworks — it is the legal framework. That is a different form of institutional corruption than CPI measures but a real one.

Qatar's partial abolition of the exit permit requirement in 2020 and introduction of a minimum wage represented meaningful reform, partly in response to international scrutiny associated with the 2022 FIFA World Cup. Whether this reform trajectory continues will be one of the more interesting governance stories of the current decade.

Global Trends: Is Corruption Getting Better or Worse?

The aggregate global CPI score has been essentially flat for a decade — the global average sits at 43 and has not improved meaningfully since 2012. This stagnation masks significant regional variation.

Improving regions: Eastern Europe showed gains in the first decade of post-communist transition, though several countries (Hungary, Poland) have seen recent declines as democratic backsliding reduced judicial and media independence. Several African countries — Cape Verde, Botswana, Senegal — have made consistent progress through institutional reform.

Declining regions: Latin America showed consistent score declines through the 2017–2023 period, reflecting high-profile corruption scandals (Petrobras/Odebrecht in Brazil, endemic corruption revelations in Mexico and Guatemala) and weakening prosecutorial independence. The United States' decline has been noted above.

Structural stagnation: Countries in the 20–40 score range — where most of the world's population lives — show the least movement. These are countries with enough institutional capacity to conduct elections and maintain basic services but insufficient independence of judiciary, media, and civil society to break entrenched patronage systems. Movement out of this band requires political will from leaders who benefit from the existing system — a collective action problem with no easy solution.

Source: Transparency International, "Global Corruption Barometer" and CPI trend analysis 2024.

Frequently Asked Questions

Q: Which country is the least corrupt in the world? A: Denmark holds the top position in the 2024 Transparency International CPI with a score of 90 out of 100, a position it has held or shared with Finland for most of the past decade. Denmark's score reflects transparent government operations, well-paid civil servants, independent judiciary and media, and social norms that strongly stigmatize public sector dishonesty.

Q: Which country is the most corrupt in the world? A: South Sudan scores lowest in the 2024 CPI at 8 out of 100. South Sudan has been in near-continuous conflict since independence in 2011, with competing armed factions systematically looting oil revenues and public resources. Somalia, which previously held the bottom position for many years, scored 9 in 2024.

Q: How is the Corruption Perceptions Index actually measured? A: The CPI aggregates assessments from 13 independent data sources — surveys of business executives, expert assessments by international organizations, and country-risk ratings. It specifically measures public sector corruption: bribery of officials, kickbacks in procurement, embezzlement of public funds. It does not directly measure private-to-private corruption or informal economy activity.

Q: Does corruption always correlate with poverty? A: Strongly, but causation runs in both directions. Poor countries are typically more corrupt, and corruption reinforces poverty by misallocating public investment, deterring foreign investment, and suppressing private sector activity. But some middle-income countries (Brazil, Mexico, South Africa) demonstrate high corruption despite significant economic development — suggesting that income growth alone does not automatically reduce corruption. Institutional quality matters independently of income.

Q: Can anti-corruption reforms actually work? A: Yes — Singapore, Estonia, Rwanda, and Uruguay all demonstrated measurable improvements from starting points of significant corruption. The common elements in successful reforms: political leadership willing to apply anti-corruption rules to its own allies; independent prosecution with genuine authority; civil service compensation reform that reduces incentives for petty corruption; and transparency measures that make corrupt transactions more visible. None of these is sufficient alone, and all require sustained commitment over years rather than one-time campaigns.

Q: Why does the US score lower than some European countries with similar institutions? A: The US decline in CPI scores from 73 (2015) to 65 (2024) reflects expert survey responses about specific institutional weaknesses: perceived political interference in prosecutorial decisions, conflicts of interest in executive branch contracting, the role of money in politics (campaign finance allows legal forms of influence-buying that other countries regulate more strictly), and weakened oversight mechanisms. The US remains well above the global average but has moved from peer-group leadership toward the middle of the high-income-country cluster.

Sources

• Transparency International, Corruption Perceptions Index 2024 — transparency.org/en/cpi/2024
• World Bank Worldwide Governance Indicators — info.worldbank.org/governance/wgi
• World Values Survey, Wave 7 — worldvaluessurvey.org
• Ross (2012), "The Oil Curse," Princeton University Press
• Mehlum, Moene & Torvik (2006), "Institutions and the Resource Curse," The Economic Journal
• Transparency International, "Corruption and the Climate Crisis" 2024 — transparency.org

The Takeaway

Corruption is ultimately an incentive structure problem, not a cultural one. The countries that have achieved near-zero corruption — Denmark, Finland, Singapore, New Zealand — did so through transparent government, independent institutions, well-paid civil servants, and genuine social sanctions for dishonest behavior. None of these features requires extraordinary wealth to begin building, though they do require sustained political commitment over decades. The countries trapped at the bottom of the CPI are not corrupt because their populations are dishonest; they are corrupt because the incentive structures, institutional designs, and power distributions within their governments make corruption rational for those who hold power — and reform would require those same people to dismantle the system from which they profit.

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