The UN's corruption treaty has gathered 193 parties without ever defining corruption:
- 31 October 2003. The UN General Assembly adopted the United Nations Convention against Corruption (UNCAC) (UNODC).
- 14 December 2005. The convention entered into force.
- 22 September 2026. The latest ratification on UNODC's status page.
What is corruption? Definition and meaning
Transparency International puts it this way: "We define corruption as the abuse of entrusted power for private gain." The power can be public or private, so a manager taking a supplier's kickback counts as much as an official selling a permit. The IMF works with a narrower meaning, "the abuse of public office for private gain" (IMF Staff Discussion Note 16/05, May 2016, p. 3).
The gain also has to be spent somewhere, which is why corruption appears among the crimes behind money laundering methods.
UNCAC defines "public official" (Article 2), then lists offenses (UNCAC text). Bribing a national official, offering a bribe to a foreign one, embezzlement by an official and laundering the proceeds must be crimes in every party (Articles 15, 16(1), 17 and 23). Trading in influence, illicit enrichment and private sector bribery are offenses a party only "shall consider adopting" (Articles 18, 20 and 21). So when adverse media ties a customer to corruption, name the offense first, then check that it is a crime where it happened.
What are the types of corruption, with global examples?
Table 1. Types of corruption by scale and by act: who is involved, what changes hands, and the law or case behind each.
| Type | Who | What changes hands | Law or dated case |
|---|---|---|---|
| Petty corruption | Officials dealing with citizens | Money or favors for basic services at a hospital, a school or a police station | Transparency International glossary |
| Grand corruption | Officials at the top | Gains for a few at the expense of many | Transparency International glossary |
| Political corruption | Political decision makers | Policies, rules and budgets bent to keep power, status and wealth | Transparency International glossary |
| Bribery | The payer and the official | An undue advantage so the official acts or refrains from acting | UNCAC Article 15; SFO DPA with Ultra Electronics, 1 May 2026 |
| Embezzlement | An official or an employee | Entrusted funds or property diverted | UNCAC Articles 17 and 22; embezzlement |
| Fraud and extortion | Anyone in the chain; a person with power | Deception for gain, such as a rigged tender; payment demanded under threat | Procurement fraud; Transparency International glossary |
| Nepotism and cronyism | An official | A job or favor for a relative or friend | Transparency International glossary (nepotism) |
| Trading in influence | An intermediary | An advantage for real or claimed sway over an official | UNCAC Article 18; Directive (EU) 2026/1021, Article 6 |
| Illicit enrichment | A public official | Assets the official "cannot reasonably explain" against lawful income | UNCAC Article 20 |
| State capture | Private interests | Laws and rules shaped for their benefit | No treaty offense of its own; IMF Staff Discussion Note 16/05, p. 4 |
Lists of "3 types" or "4 types" of corruption mix two cuts: scale (petty, grand, political) and act (bribery through state capture), and one act can happen at any scale.
On 1 May 2026 a UK judge approved a deferred prosecution agreement (DPA) under which Ultra Electronics, a defense supplier, pays £10 million plus £4.8 million in costs for failing to prevent bribery in connection with three public contracts it sought through agents, one in Oman worth up to £200 million (SFO).
Why does corruption happen, and what are its causes?
No treaty sets out a cause of corruption. These ten conditions make the acts in Table 1 pay:
- Weak governance structures. Thin controls leave gaps.
- Low wages and economic pressure. "In some respects, corruption becomes inevitable when public officials cannot earn a living wage" (IMF, p. 23).
- Wide official discretion. When one official's approval decides a license, that approval can be sold (IMF, p. 21).
- Opaque public procurement. Closed scoring on large contracts invites kickbacks.
- Weak courts. Penalties rarely follow.
- No free press. Misuse of public money goes unreported.
- Cash heavy economies. Payments leave little record.
- Political instability. Rules slip while power changes hands.
- Cultural norms around gifts. The line between courtesy and inducement blurs.
- Impunity. If the gains stay, the risk looks worth taking.
How do the results of corruption show up by sector?
Transparency International counts four costs: political, social, environmental and economic. An estimate the IMF cited in 2016 put the annual cost of bribery alone at "about $1.5 to $2 trillion (roughly 2 percent of global GDP)", a figure for 2015 (IMF, p. 5).
Sector specific impacts follow the money:
- Health. A petty payment decides who gets the hospital bed.
- Procurement. A 2013 study cited by the IMF found that corruption raised the cost of a public project by 13 percent on average in eight European states (IMF, p. 8).
- Justice. A paid judge rules for the payer.
CPI 2025, published on 10 February 2026, put the global average at a new low of 42 across 182 countries and territories, with South Sudan and Somalia last at 9.
How are corruption and AML efforts interconnected?
Picture a bank (illustrative) onboarding a builder whose beneficial owner is a deputy minister's brother. Nothing in the file says bribe. Still, the owner is a PEP's family member, so the bank looks at his source of wealth, the firm's public contracts and any adverse media naming an offense from Table 1.
Corruption and AML efforts are interconnected because a bribe's proceeds need laundering like any other crime's. FATF lists "corruption and bribery" among the designated categories of offenses that each country's money laundering offense should reach (FATF Recommendations, June 2026).
Recommendation 12 asks financial institutions to find out whether a customer or beneficial owner is among the politically exposed persons (PEPs). For foreign PEPs, and domestic ones in higher risk relationships, it adds senior management approval, source of wealth and funds checks and enhanced monitoring, family members and close associates included.
complead, formerly Sanction Scanner, runs PEP and sanctions screening at onboarding and in ongoing monitoring, so a match that appears after the account opens still reaches an analyst.
Which institutions and laws combat corruption?
UNODC calls UNCAC the only legally binding universal anti corruption instrument. FATF tests countries against its AML standard in mutual evaluations.
In the UK, bribery carries up to 10 years in prison on indictment (Bribery Act 2010, section 11). A company whose employee or agent bribes someone to win business for it has a defense only if it had "adequate procedures" in place (section 7). In the US, the Department of Justice enforces the Foreign Corrupt Practices Act (FCPA).
What changed in 2025 and 2026?
- 10 February 2025. Executive Order 14209 stopped new FCPA investigations, barring exceptions, during a 180 day review.
- 9 June 2025. The DOJ's FCPA guidelines require the Criminal Division's Assistant Attorney General to authorize every new FCPA investigation and make links to cartels and transnational criminal organizations one primary consideration.
- 29 April 2026. Directive (EU) 2026/1021 replaced Framework Decision 2003/568/JHA for every EU state but Denmark. Unlike UNCAC, it makes trading in influence and private sector bribery mandatory offenses; transposition is due by 1 June 2028.
- 1 May 2026. The Ultra Electronics DPA applied the section 7 offense.
Which five key steps help prevent corruption?
- Assess the risk. Map where the firm meets officials.
- Set a gifts, hospitality and agents policy. Ultra's contracts ran through agents.
- Check third parties. Know who owns an agent and whether a PEP stands behind it.
- Open a reporting channel. Staff need a safe route to report a bribe request.
- Monitor payments to officials and intermediaries. Success fees deserve a second look.
Once paid, a bribe still has to be cleaned, a process seen at its largest in kleptocracy, where rulers loot the state.
Related terms
- Embezzlement. Theft by the person entrusted with the funds.
- Procurement fraud. Kickbacks and rigged tenders in buying.
- Fraud vs money laundering. Making criminal money against hiding it.
- PEP screening. Checking whether a customer holds public office.
- Kleptocracy. Rule by those who loot the state.
- Money laundering. Making proceeds of crime look clean.
How this entry was checked
Melis Alparslan, Regional Sales Manager, is the author and Dilara Diker, Head of Compliance, the reviewer; the entry was last reviewed on 26 October 2026. Sources checked on 26 October 2026: Transparency International's definition and glossary, the UNCAC text and UNODC's ratification status, the FATF Recommendations (June 2026), IMF Staff Discussion Note 16/05, CPI 2025, Directive (EU) 2026/1021, Executive Order 14209, the DOJ's June 2025 FCPA guidelines, the Bribery Act 2010 and the SFO's release of 1 May 2026. The definition follows Transparency International; the offense list follows UNCAC Articles 15 to 25.
