Customs Fraud Under the False Claims Act: Why Duty Evasion Can Be a Whistleblower Case

An importer can cheat the government without ever asking it for a cent. The sales catalog describes one product, the customs entry describes another, and the difference is duty money the importer keeps. For someone who knows the goods, the invoices or the decisions inside that business, the unpaid duty can become a whistleblower case before Customs finishes calculating the bill.

When Unpaid Duties Become Reverse False Claims

False Claims Act customs fraud cases reach companies that knowingly avoid paying duties they owe. In customs fraud, the importer keeps duty money it owes, while honest importers pay in full and lose sales to companies that don’t. Taxpayers lose the revenue.

That is a reverse false claim, and it is why a customs case can pay a whistleblower reward.

Congress changed the law in 2009 to cover an established duty even when its amount is not yet fixed. Knowingly hiding or avoiding a duty owed can support a case without another false declaration.

Customs fraud can hide in the product description, the invoice or the claimed country of origin. Misclassification changes what the goods are called. Double-invoicing lowers the value Customs sees, while transshipment fraud routes goods through another country to disguise where they were made. Missing origin markings can leave a separate marking duty unpaid.

Sigma Sold Welded Outlets and Declared Steel Couplings

Sigma Corporation imported welded outlets and described them to Customs as steel couplings. That description carried no antidumping duty. Changing the product name changed the bill.

Antidumping duties address imports sold below fair value. Countervailing duties offset foreign government subsidies. The duties can exceed the value of the goods, giving an importer that evades them room to undercut competitors who pay.

Sigma’s welded outlets were Chinese pipe fittings imported between 2010 and 2018. One end had a beveled edge for welding onto a pipe. The other had a threaded connection for a sprinkler head or another attachment. The court’s account makes the commercial difference tangible: Sigma called them welded outlets in its catalog and on its website, then used steel couplings on customs forms. It also declared that no antidumping duties applied. A Department of Commerce scope ruling established that the goods were covered by the antidumping order. The court held that the duty had been owed all along.

The jury heard that Sigma had made no inquiry into whether it owed the duty. Its executive overseeing imports testified that the company had never seen the governing order or the earlier scope ruling until 2017 or 2018. Both had been issued in 1992.

A sales manager at Island Industries, a competitor, began investigating because Chinese products kept undercutting Island’s prices. Without specialized trade-law experience, the manager searched Google and contacted a Commerce analyst. The competitor found both in a day.

The jury found for Island. The False Claims Act imposes triple damages plus a civil penalty for each violation. Repeated false entries can mean repeated penalties. In a customs case, the loss is the duty the fraud kept from the government.

In Sigma’s case, the Ninth Circuit reported more than $8 million in damages before trebling. After trebling, the damages came to $24,256,638, plus $1,824,145 in civil penalties.

Victaulic Showed That Unpaid Marking Duties Count

Knowingly avoiding country-of-origin marking duties can also support a reverse false claim. The charge adds 10% of the goods’ value to the other duties owed. In the 2016 case against Victaulic, the Third Circuit held that the duty could be owed on improperly marked goods that escaped detection and entered U.S. commerce.

The whistleblower was a company made up of former pipe-industry insiders. It combined shipping information, knowledge of Victaulic’s pipe fittings and observations of products offered on eBay to allege that imported goods reached the U.S. market without proper origin markings. The court allowed the allegations to proceed. The later district court opinion records a $600,000 settlement in 2019 and a 29% whistleblower share.

Sigma concerned whether the imported product fell under an antidumping order. Victaulic concerned the separate duty attached to missing country-of-origin markings. Knowing the product means knowing which unpaid duty the paperwork concealed.

A Known Customs Error Left Uncorrected Can Become a False Claim

Leaving a known customs entry error uncorrected can support a reverse false claim even without another false declaration. In 2025, Grosfillex settled allegations that included failing to correct earlier customs forms after learning they were false.

The patio furniture company agreed to pay $4.9 million. The Justice Department described two different sets of aluminum parts: one allegedly packaged as sham furniture kits to escape antidumping and countervailing duties, another covered by earlier customs forms the company allegedly left uncorrected after learning they were false.

The whistleblower’s complaint quotes an engineering manager discussing how the separate components should appear to Customs:

We are also trying to avoid to show anything that could indicate we are buying separate components. The less info is visible, the best [sic] it is. We are buying kits: not seats and backs.

Grosfillex engineering manager, quoted in the complaint in United States of America ex rel. Edward Wisner v. Grosfillex, Inc., paragraph 51

The complaint alleged that barstool bases and backs presented as kits would predominantly be paired with different components in the United States. What the factory shipped, what the business intended to assemble and what Customs was told were all part of the story. For the uncorrected entries, the question was what Grosfillex did after it learned the earlier declarations were false.

The Duty Exists Before Customs Finishes the Bill

A customs duty can be owed before liquidation, the final calculation of the bill. The goods, the declaration and the payment move on different schedules.

For an ocean shipment, the importer supplies manufacturer and origin information before loading, and the carrier separately files its manifest. Entry allows Customs to decide whether to release the goods. The entry summary states their value, classification and duty rate, with estimated duties deposited. As the entry requirements describe, releasing the cargo and declaring the information needed to assess the duty are separate tasks. The goods can be moving into commerce while the final duty calculation is still ahead.

In 2025, the Ninth Circuit held that Sigma Corporation owed antidumping duties as soon as its goods arrived in the United States, before liquidation fixed the final duty bill. The unfinished calculation did not erase the obligation.

Sigma also argued that once its entries were liquidated, its evasion had deprived the government of nothing. The court put the problem plainly:

“In sum, an importer cannot evade duties, wait until its entries are liquidated, and then assert based on that liquidation that its actions did not deprive the government of money.”

Ninth Circuit, Island Industries and Sigma Corporation, amended August 21, 2025

Customs False Claims Act Jurisdiction Depends on Who Filed

In the Ninth Circuit, a whistleblower can bring a customs False Claims Act case in federal district court. Island Industries started the case against Sigma as the whistleblower. The government declined to join. Island’s case stayed in district court because the trade-court rule concerned cases started by the United States.

The United States itself sued Universal Fruits over allegations that it imported Chinese garlic while declaring it as Korean. The trade court’s account describes the result: the government’s case was sent there from federal district court, then dismissed because the trade court could not hear its False Claims Act demand. The private filing in Sigma avoided that problem.

The Ninth Circuit also rejected Sigma’s argument that Customs’ own penalty law pushed the False Claims Act aside. The FCA’s only express carve-out is for taxes under the Internal Revenue Code. There is none for customs duties.

What Evidence Is Needed for Qui Tam?

A customs False Claims Act case needs an actual duty owed, the conduct that avoided payment, and evidence of what the company knew. A product catalog, purchase order, or supplier email can establish what the goods actually were. The entry summary shows what Customs was told. Matching those records to the affected shipments helps explain why the difference mattered to the duty payment.

The False Claims Act reaches knowing customs fraud, deliberate ignorance and reckless disregard. What the company understood when it acted matters, including whether it chose not to find out. An audit finding or advice can show when the company learned of the problem. Later payments, corrections, and decisions show what it did with that knowledge.

The Same Product Connects the Commercial and Customs Records

Product numbers can connect the commercial description to the customs declaration. The World Customs Journal’s 2024 paper, Customs Tariff Classification and the Use of Assistive Technologies, describes how companies record commodity codes against material references, catalog numbers and SKUs in their own systems. That connection gives the product sold to customers and the product declared at the border a common identity.

The carrier’s manifest, bill of lading, supplier invoice and entry summary come from different points in the transaction. Purchasing and factory records identify what was made, who made it and what the buyer paid. In customs undervaluation, the invoice accounts payable received can tell a different story from the invoice sent to the broker. A buyer-supplied mold or component can add to the customs value even when the factory’s invoice leaves it out.

The importer of record remains responsible for the duty when a broker files on its behalf. The broker’s instructions and the supplier’s commercial records show who supplied the description, origin and value that reached Customs. The person typing the entry, the person paying the invoice and the person deciding what to disclose may sit in different businesses. Connecting those decisions is part of connecting the fraud.

In the $12.4 million settlement with Allied Stone, the Justice Department alleged that Allied Stone misrepresented Chinese quartz products as marble or crystallized glass. It also alleged that Allied Stone failed to ensure that manufacturers and third-party importers declared and paid the duties. The allegation followed the company’s role across the businesses handling the imports.

Who Can File a Qui Tam Lawsuit?

An importer’s employee, a customs broker, someone at a supplier or a competitor can bring a customs whistleblower case. Island’s case shows what a competitor’s product knowledge can accomplish. The Grosfillex case came from someone who had worked for the company. A whistleblower case under the False Claims Act can pay a reward of 15% to 30% of what the government recovers.

How Do I Report Customs Fraud?

Speak with our whistleblower experts about how to report customs fraud through a case built around the unpaid duty and the people who knew about it. Choosing the route belongs in our first conversation about your case.

We remain your partners throughout the case and find customs fraud whistleblower lawyers who know duty-evasion cases.

Sources

When You Can Explain the Unpaid Duty

If you know an importer is paying less duty than it owes, you may have the records that show both the shortfall and who knew about it. Speak to one of our Whistleblower Experts about how the duty went unpaid. We help you connect the entries, the money and the decisions inside the business to build your strongest customs whistleblower case.

WHISTLEBLOWER JUSTICE NETWORK CAN HELP YOU

Make a difference.

Report Fraud

100% CONFIDENTIALFREE CONSULTATION24 / 7 / 365