American merchants who sell goods across international borders face a significant shift in their operational and financial liabilities under a new U.S. Postal Service rule that places the responsibility for certain foreign customs charges directly on the shipper.
Taking effect on October 19, the regulatory change establishes formal procedures for collecting or reimbursing foreign duties, taxes, and import fees that go unpaid during international transit. Under the framework, the USPS—acting either directly or through a designated third-party representative—will issue a direct invoice to merchants whenever specific foreign customs fees remain unpaid or when a foreign entity actively seeks payment for a processed shipment.
The policy change arrives as global e-commerce shipping dynamics undergo structural shifts, most notably in Europe, and introduces potential long-term financial exposure for U.S. businesses that ship products overseas.
Responsibility
The scope of the new USPS rule is broad, covering duties, taxes, and potentially wider fees imposed by a variety of international actors, including foreign customs agencies, designated postal operators, private brokers, and other logistics service providers.
If any of these entities report an unpaid charge associated with an outgoing parcel, the USPS is now authorized to invoice the originating shipper, a party traditionally referred to in postal parlance as the mailer.
This regulatory update does not mean that every single U.S. merchant sending an international package will automatically receive a bill. Ultimate responsibility for customs charges continues to depend heavily on the destination country’s specific legal requirements and the chosen shipping method. However, the rule introduces a layer of financial risk, meaning additional costs could surface long after an international delivery has seemingly been completed or terminated.
Europe
The USPS explicitly linked the implementation of this rule to the July 2026 expiration of the European Commission’s de minimis exemption. The conclusion of that policy means that import fees and duties now apply to low-cost merchandise that previously would have entered the European Union completely duty-free.
Because all major carriers operating in the space—including private alternatives like UPS and FedEx—must ensure that all applicable charges are fully paid, simply switching shipping carriers does not eliminate the underlying risk for merchants.
To manage the transition following the end of the de minimis exemption, the European Union has implemented a temporary, non-refundable flat fee of €3.00 (approximately $3.36 USD) for each unique Harmonized System (HS) Code product type contained within a shipment. This classification system is widely utilized by the E.U. and customs authorities worldwide to categorize traded goods.
Under this temporary system, a parcel containing three distinct items that share the exact same HS classification will incur a total of €3.00 in duties. Conversely, if a package contains products spanning two separate HS classifications, the parcel’s temporary duty obligation doubles to €6.00.
European Union authorities have indicated that this flat-fee duty structure will remain in effect through June 30, 2028, at which point more permanent, comprehensive import procedures are expected to take their place.
Despite the immediate trigger being the European regulatory shift, the USPS rule itself is not limited in geographic scope to Europe and applies universally to international shipping channels where unpaid fees may arise.
Dispute Later
Perhaps the most consequential and controversial aspect of the new rule is the procedural order of operations regarding financial disputes: merchants are required to pay the USPS invoice even while they are actively disputing an underlying, potentially incorrect assessment.
The postal service has made it clear that it is not responsible for determining whether a foreign customs authority, foreign postal operator, or any other entity calculated its financial charge correctly. Instead, if a merchant believes an error was made, they must pursue the matter independently with the specific foreign entity that assessed the fee.
Furthermore, a failed shipment or a canceled transaction does not necessarily eliminate the financial liability. The rule explicitly states that the shipper remains entirely responsible for all applicable charges regardless of the final status of the parcel—whether it is successfully delivered, lost in transit, damaged, or returned to the sender.
To illustrate the financial implications, consider a scenario where a U.S. merchant ships a $100 order to a customer located in France. Upon arrival, the customer declines to accept the package because of an unexpected customs charge levied by local authorities. The merchant receives the returned product and issues a full refund to the customer for the order.
Despite the order being canceled and refunded, the merchant could still find themselves legally owing the unpaid foreign customs charge to the USPS, complete with added interest. Under the postal guidelines, any past-due USPS invoice resulting from these unpaid fees accrues interest at an annual rate of 6%.
DDP
For merchants seeking to mitigate uncertainty and minimize the risk of post-delivery invoicing, one viable option is utilizing the USPS Delivered Duty Paid (DDP) service for eligible international shipments and destination countries.
When utilizing DDP, a merchant obtains an upfront quote and prepays all applicable duties, taxes, and fees at the exact moment they purchase their outgoing postage. The service currently functions for shipments directed to 18 countries, a roster that includes vital trading partners such as Canada and the United Kingdom.
While the USPS itself does not charge an additional fee for utilizing the DDP framework, its designated third-party technology provider, Zonos, incorporates a service fee directly into the generated quote.
While a DDP quote may not always serve as an absolute, unchangeable ceiling for every conceivable contingency, it successfully reduces the likelihood of unexpected, retroactive charges. Conversely, sending international parcels without prepayment—where permitted by destination rules—leaves those potential costs unresolved and vulnerable to collection actions once the package reaches its international destination.
After Delivery
Global merchants, including small and large businesses operating out of the United States, have long been accustomed to managing international duties and taxes, as well as communicating those potential costs to end consumers. That foundational responsibility is not entirely new.
However, the new USPS rule adds a compelling financial imperative to treat those cross-border charges as an integral part of the initial sale rather than treating them solely as the customer’s problem upon arrival.
As a result, a merchant selling low-margin products internationally may find that they need to strictly account for potential unpaid shipping costs and retrospective liabilities. Returned, refused, or undelivered orders could prove particularly costly because customs liability can legally persist long after the corresponding product revenue has vanished from the business’s accounts.
The regulatory shift is also expected to influence how merchants integrate and utilize shipping software systems, calculate complex landed costs, establish country-specific shipping and return policies, and handle the accounting associated with international returns.
While the exact mechanics of how these invoices will physically or digitally arrive remain flexible under the broader framework, the fundamental reality for merchants is clear: international orders now carry a prolonged, shipping-related liability that extends well past the point of delivery, lingering even through the lifecycle of returned goods.
