A quiet, technical line of business has become one of the surprise beneficiaries of Donald Trump’s trade policies – and a pending Supreme Court ruling now threatens to turn that upside down.
Customs bonds, a form of surety cover that backs payment of duties and taxes on imports, have swelled in size and cost as the Trump administration pushed through higher tariffs under the International Emergency Economic Powers Act (IEEPA). Bigger duties have meant bigger bond limits, fatter premium streams and, in many cases, new demands for collateral that sits with insurers instead of on importers’ balance sheets.
That boom is now under scrutiny. The Supreme Court is examining whether the IEEPA tariffs were imposed lawfully and could issue a decision as soon as February 20. If the justices strike the tariffs down, billions of dollars tied up in bond‑related premiums and collateral could be revisited, creating both revenue pressure and operational headaches for carriers and surety specialists.
Any company bringing goods into the US has to arrange a customs bond, usually via a specialist surety provider, so that US Customs and Border Protection is paid even if the importer fails to meet its obligations. The bond limit is pegged to a share of the duties and taxes expected over a rolling 12‑month period, and premiums are typically charged as a small percentage of that limit.
When tariff rates move from low‑double digits to 25% or more, the maths changes quickly. Industry sources describe bond limits that once hovered near the $50,000 regulatory minimum now climbing into the tens or even hundreds of millions of dollars for large traders. In many cases, required limits have multiplied two‑ to five‑fold, and one large auto manufacturer reportedly saw its customs bond obligation increase by more than 550%.
For insurers prepared to deploy capacity, the result has been a lucrative niche: every step up in bond size generates additional premium, and tighter underwriting and collateral requirements help cushion the extra risk.
The tariff shock has also exposed weaker spots in the system. Trade lawyers report that Customs has been sending out far more “insufficiency notices” – formal alerts that an importer’s existing bond is no longer adequate for its tariff exposure – as duties and shipment values rise.
Government figures indicate that, by the first seven months of 2025, bond insufficiencies were already nearing $1.5 billion, compared with roughly $546 million recorded for all of 2024. The volume of insufficiency notices has surged several times over since 2017, with around half relating to bonds below $100,000, a sign that smaller and mid‑sized businesses are feeling the strain.
To keep freight moving, insurers are increasingly insisting on collateral or additional guarantees from clients whose credit profiles look stretched. That cash or security can remain parked with the surety provider for roughly 10 months – the 314‑day period Customs uses to review and finalise duties – during which it earns no interest and cannot be redeployed by the importer.
Within this environment, carriers with established customs‑bond operations have enjoyed an unusual, policy‑driven lift. Analysts point to specialist and multiline insurers such as RLI, CNA, Chubb, Liberty Mutual, Skyward and Palomar Specialty as among those seeing stronger demand for surety support as trade volumes remain high.
Executives have noted on earnings calls that this uptick in customs‑bond activity has helped offset softer performance in other areas heavily influenced by government policy, including parts of the renewable energy space. Elevated tariffs, higher import values and stricter credit standards have, for now, turned customs bonds into a surprisingly attractive corner of the market.
That favourable backdrop could change quickly if the Supreme Court ultimately concludes that Trump’s use of IEEPA for tariffs was unlawful. In that scenario, importers would push for refunds of duties already paid, and many would also seek to have associated bond limits, premiums and collateral adjusted downward or partially returned.
For insurers, such an outcome would mean a clear drag on revenue and a sizeable clean‑up job: reopening accounts, recalculating appropriate bond levels and working through a wave of collateral‑release requests. Many surety providers already tell clients that reviewing and returning collateral can take 30 to 60 days in normal circumstances; a system‑wide reset tied to tariff refunds would place additional pressure on those processes.
Yet few participants expect trade‑policy risk to disappear even if these specific tariffs are struck down. The Trump administration has signalled that it has other legal routes ready to re‑impose tariffs should the IEEPA pathway be blocked, suggesting that importers and their surety partners may simply face a different set of rules rather than a return to pre‑tariff normality.
For the moment, though, insurers active in customs bonds – including RLI, CNA and Chubb – occupy a rare position: clear corporate winners from Washington’s tariff strategy, but also among the first in line to feel any reversal if the Supreme Court decides that the legal foundation for that strategy does not hold.
