How money laundering works
What is money laundering?
Money laundering is the process of disguising the origin of money earned from crime so it can be spent, saved, or invested without triggering law enforcement. It typically moves through three stages (placement, layering, and integration), turning cash that can't be explained into wealth that can.
Why launder at all?
Crime pays in the worst possible currency. Street drug sales produce duffel bags of small bills: heavy, bulky, and flagged the moment anyone tries to bank them. Fraud and ransomware produce balances that victims, banks, and blockchains can trace. Either way, the money is evidence. It links its owner to the crime, and it can be seized on sight.
So the launderer has one job: break the link between the money and its origin, and give it a new story that survives a bank’s questions and a prosecutor’s subpoena. Cash is the hard case: a US$1 million in $20 bills weighs over 50 kilograms and no car dealer, land registry, or stockbroker will take it. That constraint drives almost every technique in this guide.
Where the money comes from
The underlying offence is called the predicate crime. The big categories: drug trafficking, fraud (increasingly industrial-scale online scams), corruption and kleptocracy, tax evasion, human trafficking and smuggling, and sanctions evasion. Terrorist financing is the mirror image: often clean money flowing toward illicit use, which is why the two are regulated together.
What are the three stages of money laundering?
The Financial Action Task Force describes laundering as three stages. Real schemes blur them, but the model is the shared vocabulary of every AML regime:
Stage 1
Placement
Dirty money enters the financial system. This is the riskiest moment, when cash first meets a record.
Stage 2
Layering
The trail is buried under transfers, entities, conversions, and borders until following it costs more than the money is worth.
- Black Market Peso Exchange
- Casinos and gambling
- Chain-hopping and cross-chain bridges
- Flying money: Chinese underground banks
- Hawala and informal value transfer
- Mixers, tumblers, and CoinJoin
- Money mules and funnel accounts
- Shell companies and nominees
- Stablecoins and OTC brokers
- Trade-based money laundering
Stage 3
Integration
The money re-enters as assets with their own paper trail: property, businesses, portfolios.
The model has limits worth knowing. Crypto thefts and online fraud generate money that was never physical cash, so there is nothing to “place.” Trade-based schemes move value and integrate it in the same invoice. And professional launderers run all three stages as a single service. The stages are a map of the plumbing, not a sequence every scheme follows.
Who does it?
At the bottom: self-launderers, criminals washing their own proceeds through front businesses and family accounts. Above them: professional money laundering organizations (PMLOs), which launder other people’s money for a commission and treat detection as a business risk. Around both: professional enablers (lawyers, accountants, company-formation agents, real estate agents, art dealers) whose ordinary services supply the accounts, entities, and assets that make the laundering look legitimate.
How the law caught up
- 1970: the US Bank Secrecy Act requires banks to report cash transactions over $10,000.
- 1973: “money laundering” first appears in print, in Watergate-era reporting.
- 1986: the US Money Laundering Control Act, the first criminalization of laundering anywhere.
- 1989: FATF founded at the G7 summit in Paris; the 40 Recommendations follow in 1990.
- 2000: Canada’s PCMLTFA creates FINTRAC.
- 2001: USA PATRIOT Act expands AML rules after 9/11.
- 2002: UK Proceeds of Crime Act builds the SARs regime.
- 2019: FATF extends its standards, including the “travel rule,” to crypto businesses.
- 2020s: beneficial-ownership registers arrive in the UK, Canada, the EU, and (more narrowly) the US.
For what all this machinery looks like from the inside (reports, monitoring, FIUs, and why most alerts go nowhere), see how detection works.
Frequently asked questions
Why do criminals need to launder money?
Because criminal cash is nearly useless at scale. It is heavy, conspicuous, and unbankable; you can’t buy a house with a duffel bag of twenties. Laundering converts it into forms that survive scrutiny: bank balances, businesses, property. See placement for where that conversion starts.
What are predicate crimes?
A predicate crime is the underlying offence that generated the money: drug trafficking, fraud, corruption, tax evasion, human trafficking, sanctions evasion. Laundering is a separate crime layered on top; you can be convicted of laundering even if the predicate happened abroad.
Is the three-stage model always accurate?
No. It is a teaching model. Crypto thefts and online fraud produce money that was never physical cash, so there is no placement stage at all, and trade-based schemes collapse layering and integration into one step. Investigators use the stages as a map, not a rulebook.
Who actually does the laundering?
Three tiers: criminals laundering their own proceeds; professional money laundering organizations that launder for a fee; and professional enablers (lawyers, accountants, company-formation agents, real estate agents) whose services provide the structures. See the technique catalog for how each operates.
Sources
- Money Laundering: Overview (UN Office on Drugs and Crime, accessed August 2026).
- Does crime still pay? Criminal asset recovery in the EU (Europol, February 2016).
- History of Anti-Money Laundering Laws (FinCEN, accessed August 2026).
- History of the FATF (Financial Action Task Force, accessed August 2026).
- money laundering, n. (Oxford English Dictionary, accessed August 2026).