The Department of Commerce initiated five-year sunset reviews effective May 29, 2026, covering ten antidumping duty orders spanning steel plate, melamine, methionine, potassium phosphate salts, tires, and walk-behind lawn mowers from eight countries. Trade compliance teams tracking duty exposure on these commodities should note the specific AD case numbers now under active review.

AD Case Numbers Under Review

The June 1, 2026 Federal Register notice lists the following antidumping duty proceedings now in sunset review:

The methionine orders covering France (A-427-831), Japan (A-588-879), and Spain (A-469-822) enter their first sunset review simultaneously, creating a coordinated timeline for compliance teams managing amino acid imports from multiple origins.

Procedural Framework

Commerce will conduct these reviews under procedures established in 63 FR 13516 (March 20, 1998) and 70 FR 62061 (October 28, 2005). The U.S. International Trade Commission published its concurrent Institution of Five-Year Reviews notice covering the same orders. For teams building automated compliance workflows, these Federal Register citations define the regulatory framework governing response deadlines and evidentiary requirements.

Impact on Duty Rate Calculations

Sunset reviews determine whether existing AD orders remain in force or are revoked. For compliance engineering teams, this creates a monitoring requirement: any system caching AD duty rates for affected HTS codes must track review outcomes. Revocation would eliminate the AD duty component entirely; continuation may result in modified rates based on updated dumping margin calculations per 77 FR 8101 (February 14, 2012).

The tire orders—A-580-908 (Korea) and A-583-869 (Taiwan)—cover passenger vehicle and light truck tires entering their first review cycle. Systems classifying tires under HTS Chapter 40 subheadings should flag these case numbers for outcome tracking.

Steel plate orders A-570-849 (China) and A-821-808 (Russia) enter their fifth review, indicating sustained enforcement history. Classification systems handling HTS 7208-7211 flat-rolled products from these origins require continued AD duty logic until Commerce publishes final results.

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Technical Implementation Notes

For teams maintaining HTS-to-duty mappings via API, sunset review initiations signal potential rate changes 12-18 months out. The May 29, 2026 effective date starts the clock on Commerce's investigation timeline. Systems should retain current AD rates while flagging affected case numbers for future diff detection when preliminary and final results publish.

Data Integrity Alert: Walk-behind lawn mower orders from China (A-570-129) and Vietnam (A-552-830) both enter first review. If your classification logic groups these origins under shared HTS codes in Chapter 84, implement origin-specific duty branching to capture divergent outcomes.

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