A routine import invoice can look ordinary until its price, supporting paperwork and payment route are compared with the wider trade record. Trade based money laundering red flags are observable inconsistencies in pricing, documents, destinations, trade finance and cash flows that suggest value may be moving for purposes other than the stated trade. A single indicator rarely proves wrongdoing. Combinations, repeated patterns and weak explanations matter more.
The list below moves from common pricing and documentary signals to circular transactions, trade finance and cash channels that may sit at the end of a longer chain. It assumes the reviewer has lawful access to the relevant business records and is conducting an initial, risk-based review, not making a final finding or providing legal advice. The FATF and Egmont Group risk indicators provide a wider reference for trade reviews. Politically exposed person status alone is not evidence of money laundering.
Table of Contents
- 1. Over-invoicing of goods and services
- 2. Under-invoicing of exports
- 3. Multiple invoicing and fictitious shipments
- 4. Shipping to inconsistent or high-risk destinations
- 5. Inconsistent documentation and missing transaction records
- 6. Circular trading and back-to-back transactions
- 7. Trade finance and letter of credit anomalies
- 8. Rapid on-selling and cash transactions
- 8-Point Comparison: Trade-Based Money Laundering Red Flags
- Turning Red Flags Into a Proportionate Review
1. Over-invoicing of goods and services
Over-invoicing occurs when a seller charges materially more than the goods or services are reasonably worth. The buyer pays the inflated amount through an apparently legitimate commercial channel, and the excess can move value across borders while the transaction retains a plausible paper trail.
A shipment may exist, the supplier may be genuine and the buyer may have received something. The concern is whether the economic value matches the amount paid. A premium can be legitimate where goods are bespoke, urgently required, scarce or supported by unusual warranties. It needs evidence, not merely an explanation after the event.
Pull the commercial invoice first
Start with the commercial invoice, then compare the unit price, specification, quantity and delivery terms against:
- Comparable purchases: Review recent invoices for identical or substitutable goods from other suppliers.
- Independent benchmarks: Use supplier quotations, published commodity information, trade data and relevant industry bodies.
- Negotiation evidence: Retain correspondence showing why a premium was agreed, including urgency, bespoke requirements or a different delivery obligation.
- Payment timing: Examine whether the buyer paid in full before inspection, shipment or confirmation of receipt.
A price outside the business's normal range isn't proof of TBML. It becomes more significant where the counterparty is new, the supplier's ownership is opaque, or payment goes to an account unrelated to the named seller.
Practical rule: A benchmark only helps if it compares like with like. Product grade, volume, Incoterms, freight, insurance, credit terms and delivery location can all affect price.
The reviewer should record the benchmark used, the relevant date and the reason the comparison is considered reliable. A substantial unexplained deviation should be escalated for enhanced due diligence rather than automatically treated as criminal conduct. UK guidance identifies pricing irregularities, invoice discrepancies and transactions that do not add up commercially as relevant warning signs in trade reviews. The UK National Risk Assessment of Money Laundering and Terrorist Financing 2025 describes those mechanisms and the wider TBML risk.
2. Under-invoicing of exports
Customs officers in two countries can record very different values for the same consignment. That gap is the starting point for an under-invoicing review. The exporter declares a lower value than the goods would normally justify, so the buyer appears to have received more value than the recorded payment explains. In some cases, that difference can mask a transfer of value across borders, especially where currency or capital controls are in play.
The first file to pull is the export invoice, then the import declaration in the receiving country. If the customs records show a materially different value, the reviewer should not stop at the headline figure. Different valuation rules, freight treatment and currency conversion can all explain part of the gap, but each explanation needs to be tested against the paperwork.
Test the value on both sides of the border
A reviewer should compare:
- Export and import values: Check whether both jurisdictions treated the same goods and whether any difference is explained by customs rules or charging terms.
- Cost of goods sold: Test whether the exporter's stated price could realistically cover production, freight and overheads.
- Inventory and margins: Examine whether the importer records unusually high margins because the goods were booked below their apparent value.
- Repeat shipments: Look for a persistent pattern involving the same importer, product and route. A single discount may reflect a distressed sale or a quality issue, but repeated underpricing to one counterparty is harder to dismiss.
A UK electronics exporter might declare a shipment at a low value while the importer records a much higher customs value. That discrepancy does not prove laundering, but it does justify asking for the exporter's cost records, sales agreement, valuation basis and evidence of how the buyer booked the transaction.
The more persuasive test is consistency over time. One discounted shipment can be explained by a short-term commercial reason. Persistent underpricing to the same counterparty, with no clear commercial basis, is harder to reconcile with ordinary trade.
Escalation is appropriate once the difference remains unexplained after the parties have produced the underlying contract, pricing approval, product specification, customs records and accounting entries. At that point, the reviewer should look at beneficial ownership, payment routes and whether the transaction fits the customer's stated business model.
3. Multiple invoicing and fictitious shipments
A duplicated invoice is not always obvious on first review. One shipment may be charged to more than one buyer, or reissued with different descriptions and values. A fictitious shipment goes further, with invoices and transport papers created for goods that were never shipped, or may never have existed.
Pull the original bill of lading first. Copies supplied by the trader are not enough where the risk is material. Confirmation should come directly from the issuing freight forwarder or shipping line, subject to proper authority and confidentiality controls.
Match the document to physical movement
Review the bill of lading details first, then compare them with the invoice, packing list and customs declaration. Check the reference, date, vessel, container, consignor, consignee, quantity and weight. Request warehouse records, customs clearance documents, goods receipt notes and independent inspection evidence. Confirm that the exporter recorded the goods only once in inventory and shipping logs.
A legitimate resale in transit leaves a coherent chain of contracts, title transfers, delivery instructions and payments. If that chain cannot be produced on request, treat the duplicate invoice as suspect.
Documents can show that paperwork was issued. They do not, by themselves, show that the described goods moved.
Compare certificates of origin and customs declarations with the issuing authority where verification is available. Preserve original files and metadata, not just printed copies. If the shipment cannot be independently located, or the same goods appear in several finance or stock records, escalate immediately rather than waiting for later pattern tests.
4. Shipping to inconsistent or high-risk destinations
A finance director signs off a shipment to a new consignee in a country the business has never served. The goods are saleable, the paperwork exists and the margin looks normal. The issue is whether the route, buyer and payment trail make commercial sense when read together.
Start with the shipping instruction and end-customer file. Pull the consignee's legal name, registration details, trading address, ownership, intended use and relationship to the exporter. Then compare that file with the commercial invoice, transport document, customer correspondence and payment records. The first test is simple. Does the stated destination fit the product, the customer's known business and the route taken?
A reviewer should press on three points. Compare the destination against the company's normal customer and country profile. Check whether the market has a credible use for the goods. Trace any trans-shipment points, consignee changes or extra freight costs to a documented commercial reason.
The concern rises where several features appear together: an unfamiliar destination, a route that adds avoidable complexity, end-use evidence that is thin or inconsistent, and payment from a party with no clear connection to the deal. Where an offshore entity is involved, map its ownership and role using reliable corporate records. Incorporation offshore alone does not establish wrongdoing.
Separate sanctions checks from TBML indicators
Sanctions need a separate first pass. Screen the consignee and any intermediary against current UK sanctions list screening requirements before drawing wider money laundering conclusions. If a match, ownership link or control issue appears, stop the shipment and escalate under sanctions procedures at once. If sanctions screening is clear but ownership, end-use or payment remains opaque, escalate as a TBML review and ask for senior sign-off before funds or goods move.
A practical trigger is the point at which the file can no longer explain who the actual buyer is, why this route was chosen and who benefits from the transaction. At that stage, pause approval, preserve the file and obtain a documented escalation decision.
5. Inconsistent documentation and missing transaction records
A file can look complete until the records are placed in sequence. Pull the transaction document pack first: purchase order, contract, commercial and pro forma invoices, packing list, bill of lading or air waybill, certificate of origin, insurance documents, customs declarations, payment instructions, bank records, and evidence of receipt or inspection.
Test the pack against the transaction itself. A missing document may be poor administration. Several records that contradict one another require closer review, particularly where the gaps prevent a clear account of the goods, parties, payment or delivery.
Use a transaction matrix to compare:
- Parties: Seller, buyer, consignee, payer, beneficiary and beneficial owners.
- Dates: Contract, order, invoice, shipment, customs clearance and payment.
- Goods: Description, serial numbers, quantity, quality, weight and specifications.
- Value: Currency, unit price, total amount, freight, insurance and account details.
- Sequence: Whether the chronology and changes make commercial sense.
For example, an invoice may name one account while bank records show payment to another. An additional-charge invoice may then appear without a purchase order or related correspondence. The pattern could have an innocent explanation, but the explanation should be recorded and supported by contemporaneous evidence.
Record the evidence and its limits
The UK Economic Crime Survey 2024 found that only 14% of businesses affected by money laundering said they had indisputable evidence proving criminal activity. The figure describes evidential certainty among affected businesses, not the prevalence of missing records or other red flags. Operationally, reviewers should document anomalies, secure relevant records and escalate a pattern rather than wait for proof of a completed offence.
An unexplained gap is not automatically evidence of laundering. It shows that the current file does not yet support the conclusion that the trade is genuine.
Obtain independent confirmation where the discrepancy remains unresolved. Shipping lines, customs brokers, banks, warehouses and inspection providers may hold records that clarify the position. Escalate when confirmations conflict, records cannot be produced, or the parties cannot explain who authorised the payment and received the goods. At that point, pause routine approval and move the matter into a structured forensic review.
6. Circular trading and back-to-back transactions
Circular trading becomes difficult to assess when the file shows repeated sales, payments and changes of title, but little commercial activity. In a back-to-back arrangement, a reseller may sell goods almost immediately after purchase without inspection, storage, processing or another identifiable service. That pattern is a review signal, not proof of laundering.
Start with the complete chain of invoices and purchase orders. Map each seller, buyer, intermediary, payment, shipment and title transfer. Then compare the chain with customs entries, transport records and bank movements. The first escalation point is a mismatch between the documented route and the actual movement of goods or funds.
A useful test is whether each intermediary performs a function that justifies its position in the chain:
- Does it process, inspect, customise, store or distribute the goods?
- Is each jurisdiction needed for a stated commercial reason?
- Does each price change reflect a service, cost or market movement?
- Did the intermediary receive the goods before reselling them?
- Do the parties share addresses, directors, controllers or beneficial owners?
Consider machinery moving through several countries while each intermediary invoices a higher value without an identifiable role. A complex distribution model may explain the route, but the file should support warehousing, title, insurance, financing and customer demand at each stage.
Check each intermediary and payment route
Pull corporate records, tax filings, management accounts, bank statements and evidence of operating capability. Compare staffing, premises and reported activity with the transaction volume. A paper company may have a legitimate role, while an intermediary with no credible operations or records warrants enhanced scrutiny.
Escalate the matter if the same goods appear to support several trade finance facilities, if payments return through connected entities, or if counterparties cannot explain the commercial purpose of each transfer. Guidance on missing trader fraud in the UK may help identify related tax or supply-chain concerns. Keep the review focused on value transfer, goods movement and payment purpose.
7. Trade finance and letter of credit anomalies
Letters of credit and related instruments can reduce payment risk, while shifting control towards documents. A bank may act on the specified paperwork without inspecting the goods. Reviewers should therefore test whether the instrument, amendments and underlying trade still describe the same transaction.
Pull the original letter of credit and every amendment first, together with the commercial invoice and underlying contract. Compare the beneficiary, goods description, quantity, price, shipping terms and amount line by line. Escalate where a material difference cannot be supported by a contract, carrier record or other transaction evidence.
Test the finance instrument against the trade
- Amount alignment: Establish why the letter of credit differs from the invoice or contract, and obtain approval for the difference.
- Amendment history: Require evidence for each change to price, quantity, beneficiary, destination or expiry. Commercial amendments are routine: quantities change, freight moves and customers renegotiate. The red flag is an amendment with no corresponding evidence, particularly where several changes increase the amount or weaken the document-to-goods link.
- Product specificity: Test whether a generic goods description can be matched to the invoice, packing list and shipping records.
- Counterparty capability: Compare the importer's capital, operations and credit profile with the facility and shipment size.
- Inspection controls: For higher-risk goods, establish whether independent inspection or quality evidence supports the stated product and quantity.
- Beneficiary identity: Explain any difference between the named supplier and the party receiving payment, using the contract and account details.
A letter of credit can demonstrate compliance with documentary conditions. It does not establish the underlying commercial purpose or confirm that the stated goods moved as described.
Check for overlapping trade finance
Check whether the same goods also appear in other letters of credit, bills of exchange or finance facilities. Repeated financing of one shipment may indicate a control failure or deliberate layering. Escalate to the bank's trade finance and financial-crime teams when financing overlaps, amendments lack support, or the parties cannot reconcile the instrument with the trade. Preserve the original instrument, amendment trail and related communications.
8. Rapid on-selling and cash transactions
A trader imports goods on Monday, resells them by Friday and receives payment in cash from a customer with no clear operational link. That sequence may have a legitimate explanation, but it warrants a focused review when the trader has not stored, inspected, repackaged or transported the goods.
Start with the resale invoice and bank statement. Together, they establish the buyer, price, timing and payment route. Then obtain warehouse records, delivery evidence, inventory entries, customer correspondence and any agency or brokerage agreement.
Test the transaction against operational evidence
Use the documents to answer five practical questions:
- Receipt before resale: When did the importer acquire or control the goods, and is that date supported by shipping or warehouse records?
- Physical handling: Is there evidence of storage, inspection, repackaging, transport or delivery?
- Payment identity: Did the resale customer pay directly, through an account connected to the trade?
- Price movement: What explains the change in value between import and resale?
- Cash rationale: Why was cash or an informal settlement method used, and how was it recorded?
Assess cash payments and due diligence
Cash has a lawful role in some trades. The warning sign is the combination of quick resale, no value-added activity and a payment route that leaves no audit trail. HMRC identifies unusual transactions, exceptionally large cash payments, strange customer requests and activity that does not make commercial sense as circumstances requiring attention.
If your business falls under the Money Laundering Regulations, occasional transactions at €15,000 or more trigger due diligence. High-value dealers and art-market participants operate under a lower €10,000 threshold. These figures apply to different business types, and neither is a safe harbour. The UK Money Laundering Regulations suspicious activity guidance also explains why linked payments remain relevant when transactions are split to avoid customer due diligence checks.
Escalate when quick resale coincides with third-party settlement, weak inventory records or missing customer evidence. A structured money laundering investigation can preserve the financial trail and help distinguish poor controls from deliberate value transfer.
8-Point Comparison: Trade-Based Money Laundering Red Flags
| Indicator | Warning sign to test | Evidence to review |
|---|---|---|
| Over-invoicing | Price materially above comparable goods | Invoice, specification, independent price evidence and agreed terms |
| Under-invoicing | Unexplained gap between export and import values | Customs valuation, cost records and the sales agreement |
| Multiple or fictitious invoicing | Duplicate charges or shipment evidence that cannot be confirmed | Original transport records, receipts and inventory entries |
| Unusual destinations | Route or end customer does not fit the stated trade | Customer identity, ownership, end use and separate sanctions checks |
| Document inconsistencies | Parties, dates, quantities or payments conflict | A transaction matrix and independent confirmations |
| Circular trading | Repeated transfers without a clear business purpose | Full contract chain, title transfers and bank movements |
| Trade finance anomalies | Instrument or amendments do not match the trade | Original facility, amendments, contract and shipment records |
| Rapid resale and cash | Quick resale combined with an unclear payment trail | Resale invoice, stock records, customer identity and bank evidence |
Turning Red Flags Into a Proportionate Review
No single indicator proves money laundering. A price variance may reflect quality, urgency or delivery terms. A missing document may result from poor administration. A complex route may reflect a real distribution arrangement. The practical task is to assess combinations, repetition and commercial rationale, then record why the explanation is or isn't satisfactory.
The first response should be controlled rather than dramatic. Preserve the relevant records, restrict unauthorised changes to the file and identify who owns the review. The core documents usually include the commercial invoice, purchase order, contract, bill of lading or air waybill, customs declaration, letter of credit where relevant, payment records, proof of receipt, counterparty information and beneficial ownership evidence.
A workable triage sequence
- Define the transaction: Record the parties, goods, jurisdictions, dates, amounts, payment route and stated purpose.
- Reconcile the documents: Compare quantity, description, quality, price, account details and chronology across the file.
- Test independent evidence: Confirm transport, customs, receipt, market value and counterparty identity through reliable external records.
- Assess the pattern: Look for repeated anomalies, split payments, unexplained third-party settlement, shared controllers, circular routing or activity inconsistent with the customer's business.
- Escalate appropriately: Refer the matter through the firm's nominated officer or money laundering reporting route where the pattern can't be explained.
Customer due diligence and ongoing monitoring obligations depend on the regulated activity and the circumstances. Apply the relevant sector guidance when identifying the customer and beneficial owner, understanding the transaction and assessing higher risks. HMRC’s customer due diligence and monitoring guidance is a useful starting point. A monetary threshold does not remove duties arising from suspicion or a business relationship.
Where risk is higher, enhanced checks may be needed. Their scope should follow the applicable rules and the evidence in the case. Refer concerns through the nominated officer and obtain legal advice where reporting, confidentiality or a decision about continuing a transaction is involved.
Review scope, legal duties and next steps
Procedure differs across the UK. England and Wales, Scotland and Northern Ireland have different courts, prosecuting authorities and professional reporting arrangements, even though the core UK AML framework applies broadly. Businesses should use the applicable jurisdiction's current guidance and obtain legal advice where a disclosure, restraint, employment action or litigation issue arises.
A desk review also has limits. It may identify inconsistencies without proving who controlled a transaction, whether goods physically moved, or what a party knew at the time. Confidentiality, privilege, data protection, cross-border access and independence should be addressed before records are collected or third parties contacted. Cost will depend on the number of entities, jurisdictions, documents, systems and specialist tests required, so a scoped first phase is often more proportionate than an open-ended investigation.
Lighthouse Consultants can provide forensic financial analysis and reviews relevant to suspected money laundering, unexplained transactions and control failures. Its role is investigative and analytical, not legal representation, and any findings should be kept separate from decisions reserved to the firm's legal advisers, nominated officer or law-enforcement authorities. Businesses, solicitors and insurers can book a free consultation with Lighthouse Consultants to discuss whether a focused document review is appropriate. Call +44 20 7871 0485 or email info@lighthc.london.
Lighthouse Consultants applies forensic accounting, due diligence, risk assessment and financial analysis to trade records, payment flows and documentary inconsistencies. Visit Lighthouse Consultants to review the available approach and consider a proportionate next step for a suspected TBML pattern.
