Under-invoicing understates the price or quantity on trade documents to shift value to the importer, moving value the opposite way from over-invoicing. It is a trade-based laundering technique that doubles as a tool for customs and tax evasion.
What is under-invoicing, in plain English?
Under-invoicing is the mirror image of over-invoicing. Here the exporter bills the importer less than the goods are actually worth, either by understating the price or claiming a smaller quantity than was really shipped. The importer pays the low invoiced amount but receives goods worth more, so the difference is value transferred to the importer, moving in the opposite direction from over-invoicing.
Like the rest of the trade-based family, the laundering hides in the gap between the invoice and reality. Because a genuine shipment and payment sit behind the deal, the transaction looks like ordinary trade, and the understated value quietly delivers economic benefit to the importing side. Colluding counterparties use it to settle obligations, move value across borders, or reward one party without an obvious transfer.
Under-invoicing carries an extra dimension that over-invoicing does not: it also enables customs and tax evasion. Declaring a lower value means paying lower import duties and taxes, so the technique benefits the importer twice. For that reason, checking anomalies against market pricing and duty records, not just the relationship between the parties, is central to catching it.
Over-invoicing vs under-invoicing
What changes | Over-invoicing | Under-invoicing |
Invoice vs real value | Invoice is higher than the goods are worth | Invoice is lower than the goods are worth |
Direction of value | Value moves to the exporter | Value moves to the importer |
Who benefits at settlement | Exporter receives the excess | Importer receives goods worth more than paid |
Extra effect | Justifies an outbound payment | Lowers duties and taxes owed |
Who is involved?
Who | Their role |
The importer | Pays the understated invoice and receives goods worth more, capturing the value and lower duties. |
The exporter | Issues the low invoice, usually a colluding counterparty rather than an arm's-length seller. |
Customs authorities | Assess duty on the declared value and lose revenue when it is understated. |
The bank | Sees the trade payment, often without independent market pricing or shipment data. |
What it looks like in practice
In practice
An importer brings in a shipment of branded goods and declares a unit price far below what those goods sell for on the open market. The invoice, payment, and shipping documents all agree with each other, so the transaction reconciles internally and clears customs at a low declared value.
When an analyst benchmarks the declared price against market data and checks the duty records, the understatement is stark: the importer paid a fraction of the real value, received goods worth much more, and paid reduced import taxes on top. The exporter and importer turn out to be connected, so the low price was not an arm's-length bargain but a deliberate transfer of value.
Why it is hard for operators
As with all trade-based methods, the deal is wrapped in genuine trade and looks internally consistent. A single low-priced import reads like a good deal or a bulk discount, and banks processing the payment usually cannot see whether the price is realistic. The understated value is invisible unless you have an external reference to compare it against.
What sharpens detection for under-invoicing specifically is the customs and tax angle. Because the technique lowers declared value to cut duties, duty and customs records become a second benchmark alongside market pricing. Checking declared values against both, rather than only judging the relationship between the parties, is what exposes the systematic understatement that signals laundering rather than an honest discount.
What to watch in the data
- Below-market pricing. Declared values noticeably below fair market price for the same goods.
- Quantity understatement. Shipments containing more goods than the invoice states.
- Value received exceeds paid. Importers consistently receiving goods worth more than they nominally paid.
- Duty and tax anomalies. Declared values that also minimize import duties and taxes owed.
- Related counterparties. Connected exporter and importer, removing genuine arm's-length pricing.
Quick questions
How does under-invoicing move value?
The importer pays less than the goods are worth but receives their full value, so the difference is transferred to the importer. The understatement on the invoice is what carries the value.
How is it different from over-invoicing?
They are mirror techniques. Over-invoicing bills too much and moves value to the exporter; under-invoicing bills too little and moves value to the importer. Under-invoicing also reduces duties and taxes.
Why does it enable tax evasion?
Import duties and taxes are assessed on the declared value. Understating that value lowers the tax and duty owed, so the importer benefits both from the transferred value and from reduced obligations.
What data helps catch it?
Independent market pricing for the goods and customs and duty records. Comparing the declared value against both references reveals systematic understatement that a single deal would not expose.
Is a low price always suspicious?
No. Genuine discounts, bulk deals, and market shifts happen. What signals laundering is a consistent, unexplained gap between declared and market value, especially between related parties and paired with duty minimization.
Where does it sit within TBML?
It is one of the core trade-based money laundering techniques, alongside over-invoicing, phantom shipping, and multiple invoicing, all of which hide value movement inside apparently normal trade.