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Base rate computed from analyst-asserted responds_to: edges in the reverse direction (target-country → issuer-country) for prior issuer-actions on the same target. Modal type + lag percentiles only — not a model output. Treat as a historical anchor for sizing counter-response scenarios, not a forecast in itself.
This is the first operational use of Section 122 of the Trade Act of 1974 (19 U.S.C. § 2132) since its 1974 enactment. Section 122 authorizes the President, upon a finding of "fundamental international payments problems," to impose an import surcharge of up to 15% ad valorem for up to 150 days (extendable only by Congressional action). The proclamation makes the requisite finding tied to the US balance-of- payments deficit and imposes the surcharge at the 10% baseline rate.
The proclamation was promulgated the same day the Supreme Court issued its 6-3 ruling in Learning Resources, Inc. v. Trump, 607 U.S. ___ (2026), holding that IEEPA does not authorize the president to set tariffs and vacating the EO 14257 reciprocal-tariff regime. Section 122 is therefore a statutory replacement instrument under a different (and judicially undisturbed) authority — not an amendment to the IEEPA regime, which has been judicially extinguished.
The substantive mechanics differ materially from the prior reciprocal- tariff regime: Section 122 imposes a single uniform rate (vs. the country-specific 10–125% IEEPA schedule), explicitly time-boxes to 150 days, and contains a much broader product-exception list than the IEEPA framework. The trade-coverage estimate from Global Trade Alert puts the affected import flow at roughly $1.2 trillion, ~34% of annual US imports — a smaller share than the IEEPA reciprocal regime had covered, primarily because of the larger product-exception list and the Section 232 stacking exclusion.
proclamation; only Congress can authorize continuation. This is the most consequential parameter for positioning — any portfolio hedging built off the surcharge needs an explicit decision-rule for the July expiry.
signaled (Feb 21 social-media post; confirmed by Treasury Secretary Bessent on 4 March 2026) intent to raise the surcharge from 10% to the 15% statutory cap. As of late March / early April 2026, no formal amending proclamation has been issued. If/when issued, this belongs as an amendments: row on this action, not a new filing.
under EO 14257 are entitled to refunds following SCOTUS vacatur; Section 122 duties are owed prospectively from 24 February. The net duty change at the importer level depends on the IEEPA country-rate they had been paying (e.g., a UK importer paying 10% IEEPA baseline sees no change; a Vietnamese importer paying 46% IEEPA reciprocal sees a 36-pt cut).
USMCA-originating receive 0% Section 122 surcharge while non- qualifying same-product imports pay 10%. This sharpens the incentive on Mexican and Canadian rules-of-origin compliance and reinforces the nearshoring incentive that animated Mexico's Plan México (2025-01-21).
surcharge does not stack on Section 232 duties, recently-issued Section 232 proclamations (semiconductor 2026-01-14, critical minerals 2026-01-14, pharmaceutical 2026-04-02, copper 2025-07-30) are now the binding instruments for those product spaces; the 10% Section 122 surcharge applies only outside the 232 perimeter.
been introduced as of filing; the procedural pathway requires affirmative legislation, not a default extension.
the 150-day window expires? Filing an amendments: row when this is published in the Federal Register.
textual delegation than IEEPA, but the "fundamental international payments problems" finding is unprecedented and a litigation pathway exists. Track for filings in CIT or D.D.C.
exclusions? Initial reporting summarizes by category; the Federal Register annexes contain the HTSUS-line-level detail required for accurate trade-flow exposure mapping.