CBP will process an estimated $130 billion in refund claims tied to the 10% global IEEPA tariff that applied to virtually all imports from April 5 through July 8, 2025—a 94-day window that affected entries under thousands of HTS codes across all 99 chapters of the tariff schedule.

The Four-Step Electronic Refund Framework

CBP's refund process requires importers to navigate four distinct phases: eligibility verification, claim submission via ACE, CBP review and validation, and Treasury disbursement. The agency has not yet published the specific ACE message sets for refund claims, but internal guidance indicates the process will leverage existing Post Summary Correction (PSC) infrastructure with new data elements for IEEPA-specific duty recovery. Importers must identify affected entries within the 150-day PSC window from the original entry summary date, meaning entries from April 5, 2025 will reach their filing deadline by early September 2025.

Key Timeline: Entries filed on April 5, 2025 (first day of 10% global IEEPA tariff) will hit their 150-day PSC deadline around September 2, 2025. Compliance systems must flag all IEEPA-affected entries before this rolling deadline passes.

Technical Requirements for Claims Filing

Each refund claim must reference the original entry number, the specific HTS codes assessed at the 10% IEEPA rate, and the calculated duty overpayment. CBP will cross-reference claims against its internal entry data, requiring exact alignment between the importer's records and CBP's ACE database. For systems that cached the 10% ad valorem rate during the April-July period, maintaining an audit trail of which rate was applied to which entry becomes essential for claim substantiation.

The IEEPA tariff applied under HTS 9903.01.25 (general provisions for emergency tariff measures), which stacked on top of existing Column 1 general rates and any applicable Section 301 or 232 duties. Refund calculations must isolate only the IEEPA component—not the underlying MFN rate or other special duties that remain in effect. A misclassified entry that triggered incorrect IEEPA assessment creates a compounded refund calculation problem that requires both rate and classification correction.

Data Integrity Alert: Systems that did not preserve historical rate snapshots from the April 5–July 8 period will struggle to substantiate refund claims. CBP requires documentation showing the duty actually paid versus the duty that should have applied post-exemption.

System Architecture Implications

Compliance platforms must implement three capabilities to support IEEPA refund processing: retroactive entry querying by date range and tariff provision, duty component isolation for entries with multiple stacked rates, and PSC deadline tracking with automated alerts. The ACE Cargo Release and Entry Summary systems will require updates to accept the new refund claim transaction sets, likely modeled on the existing CBP Form 7501 amendment process but with IEEPA-specific data fields.

Rate caching strategies face particular scrutiny. Systems that updated HTS rates in real-time when the IEEPA tariff was rescinded on July 9, 2025 may have overwritten the historical 10% rate needed to calculate refund amounts. Best practice requires maintaining versioned rate tables with effective date ranges rather than single-value caches. The TradeFacts API returns rate data with effectiveFrom and effectiveTo timestamps specifically to support this historical lookup requirement.

Preparing for the Claims Window

CBP has indicated the electronic filing portal will open in Q3 2025, with processing prioritized by entry date to accommodate the rolling 150-day PSC deadline. Importers with high-volume programs should pre-validate their entry data against current ACE records now, before the claims window opens. Discrepancies in HTS classification, entry value, or country of origin between internal systems and CBP records will delay refund processing and may trigger additional CBP scrutiny.

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