More than 330,000 U.S. importers are waiting for the federal government to return roughly $166 billion in tariff payments that courts have struck down, and the tab keeps climbing. Interest on the refund principal is accruing at a pace exceeding $20 million per day, a rate that translates to hundreds of millions of dollars each month. With fewer than 57,000 importers registered for refunds by mid-April and a processing timeline measured in months, the gap between what the government owes and what it has returned is widening fast.
Why $166 billion in voided tariffs is growing by the day
Federal law leaves little ambiguity about the obligation. Under Section 1505 of Title 19, U.S. Customs and Border Protection (CBP) must refund excess duty deposits “together with interest” upon liquidation or reliquidation of entries. Every day the money remains in government accounts, the statutory interest clock adds to the balance owed to importers.
The Cato Institute, a libertarian-leaning think tank, has estimated that the daily interest charge on these IEEPA-related refund obligations exceeds $20 million, pushing the monthly total into the hundreds of millions of dollars. At that pace, the liability grows by roughly $650 million every 30 days before a single refund check clears. Because interest is calculated on the principal as it stood when the duties were originally collected, the longer it takes CBP to process claims, the more expensive the judgment becomes for the government.
The practical problem is speed. CBP official Brandon Lord told the Court of International Trade in a filing that, as of early March, more than 330,000 importers and 53 million entries were tied to the refund obligation, a caseload he said would require about 4.4 million staff hours to process manually. That estimate alone signals a years-long slog without automation and explains why interest has become such a significant component of the overall liability.
To avoid a purely paper-based grind, CBP launched an electronic portal within its existing ACE system, often referred to as the CAPE/ACE interface, to accept refund claims and supporting data. Even with that tool, the agency told the court it expects a 60-to-90-day window to validate each submission and issue payments, meaning the interest meter continues running for at least two to three months after an importer files. The sheer volume of entries and the need to match each one to the correct importer, tariff line, and payment history make shortcuts risky and, from CBP’s perspective, legally perilous.
Court filings and portal data behind the $166 billion figure
The $166 billion headline number comes directly from Lord’s sworn statement to the Court of International Trade, which described the approximate value of tariffs collected under authorities that the Supreme Court later invalidated. That figure reflects duties paid on millions of shipments over several years, much of it tied to emergency powers that allowed the executive branch to raise tariffs quickly but were ultimately found to exceed statutory limits. The same filing disclosed the 53 million individual entry records that CBP must review, validate, and reconcile before issuing payments.
Subsequent court reports and public statements have fleshed out the scale of the task. In early March, Lord’s filing detailed the need to reprogram CBP’s systems, build the CAPE/ACE interface, and assign personnel to handle what he described as an unprecedented refund operation. According to case records cited by the Associated Press, the agency projected that the combination of system changes and manual checks would stretch well beyond the initial rollout of the portal, leaving many importers waiting months before they could even submit complete claims.
By mid-April, the gap between potential beneficiaries and those actually in the queue remained striking. Data CBP provided to the Court of International Trade showed that just 56,497 importers had registered for refunds through the portal, far short of the more than 330,000 entities identified in Lord’s filing. At that point, eligible refunds including interest totaled about $127 billion, according to figures reported by the agency and summarized in subsequent AP coverage. The difference between that amount and the $166 billion overall estimate reflects both the portion of claims not yet filed and the interest that continues to accrue on the outstanding balance.
CBP has been filing periodic progress updates with the Court of International Trade, outlining how many applications have been submitted, how many entries have cleared validation checks, and what volume of payments the agency anticipates in its first waves of refunds. Those reports suggest incremental progress, but they also underscore that the process is likely to take years rather than months. For importers, that means a growing receivable on their books, offset by uncertainty over timing. For the federal government, it means a mounting interest bill on top of the already staggering principal-a cost of delay that compounds every day the money is not returned.
David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
