Layering

In anti-money laundering, layering is the stage of money laundering in which criminal proceeds that have already entered the financial system are moved through a series of transactions designed to separate them from their source. The aim is to make the trail so long and complicated that investigators, banks and auditors cannot easily link the money back to the crime that produced it. Layering can involve wire transfers between countries, changes of currency, purchases and sales of assets, and the use of companies and accounts held in other people's names.

Layering is the middle step of the classic three-stage model of money laundering stages. It follows placement, when cash or other proceeds are first introduced into the financial system, and comes before integration, when the cleaned funds re-enter the legitimate economy as apparently lawful wealth. In practice the stages overlap, and some schemes skip or combine them, but the model remains the standard way regulators and trainers describe the process.

Layering techniques change with technology and regulation, but several methods recur in typologies published by the Financial Action Task Force and national financial intelligence units:

• Multiple wire transfers. Funds are sent rapidly between accounts in different banks and countries, often through jurisdictions with weak supervision or banking secrecy.
• Shell and front companies. Money passes through a shell company or a chain of companies with hidden owners, often using a nominee owner to conceal who controls them.
• Trade transactions. In trade-based money laundering, invoices are inflated or falsified so that value moves across borders disguised as payment for goods.
• Money mules. Accounts opened by recruited individuals, often part of a money mule network, receive and forward funds so that the criminal never appears in the records.
• Asset conversion. Funds are used to buy securities, property, precious metals or luxury goods, which are then sold, sometimes repeatedly.
• Crypto assets. Criminals convert funds into cryptocurrency and move them across many addresses and blockchains, using techniques such as chain hopping and mixing services.

Each individual transaction in a layering scheme may look ordinary. A transfer between two business accounts, a currency exchange or an invoice payment is not suspicious on its own. The pattern only becomes visible when the flows are viewed across accounts, institutions and countries, and no single bank usually sees the whole chain. Speed adds to the difficulty: funds may move through several accounts in a day, leaving each bank with only a brief window to act.

Professional launderers deliberately exploit gaps between institutions and jurisdictions, for example by using correspondent banking relationships or nested accounts, in which a foreign bank's own customers reach the system through another bank's account.

Banks and payment firms look for layering indicators such as funds that arrive and leave an account almost immediately, round-number transfers with no clear business purpose, complex ownership structures, payments routed through unrelated third countries, and activity that does not fit the customer's stated profile. Frequent changes of beneficiary, back-to-back loans and transfers between companies that share directors or addresses are also common warning signs.

The main defences are sound customer due diligence, which establishes who the customer is and what activity to expect, and transaction monitoring, which flags behaviour that departs from that expectation. Identifying beneficial owners makes it harder to hide behind company chains, and payment transparency rules require originator and beneficiary details to travel with wire transfers. When staff or systems identify possible layering, firms file a suspicious activity report with the national financial intelligence unit.

In crypto, blockchain analytics tools trace funds across addresses, and the travel rule extends originator and beneficiary information requirements to virtual asset service providers. Information-sharing arrangements between banks, where the law allows them, help close the gaps that layering relies on.

Many large enforcement cases against banks have involved failures to detect layering rather than placement, because the bank processed high volumes of transfers for customers whose activity had no apparent economic purpose. Regulators expect firms to look at the overall pattern of activity, not just individual transactions, and to escalate cases where the source of funds cannot be explained.