Recurring BIS Section 232 steel/aluminum inclusion window for 2026-09; dates are rule-based projections and exact request dates must follow the official posting.

A Section 232 measure is a U.S. trade action addressing imports that are determined to affect national security. For steel and aluminum, an “inclusion window” generally refers to a period when parties may request that additional steel or aluminum products be covered by the measure, or otherwise considered under its product-scope process. The Bureau of Industry and Security (BIS) may administer related procedures, while the official notice explains the scope, eligibility, and filing requirements.

This type of measure typically affects importers, manufacturers, sellers, and downstream users whose goods contain covered steel or aluminum, including products that may be classified as derivative articles. It matters because coverage can change the applicable entry treatment, documentation, reporting, and financial liability. A calendar or system label describing a projected window is not the legal authority: rely on the official posting for the actual opening, closing, and request requirements, and obtain customs-broker or trade-counsel advice when classification or scope is uncertain.

What to check

• Check the official BIS and Federal Register notice for the controlling scope, eligibility rules, filing method, and exact request dates.
• Review the product’s tariff classification, material composition, country of origin, and whether it is a steel or aluminum derivative article; do not rely on the commercial product name alone.
• Compare the measure’s product scope with the relevant HTSUS provisions and any applicable exclusions, quota arrangements, certifications, or reporting instructions.
• Keep supplier records, mill or smelter information, bills of materials, invoices, and origin documentation that support the entry treatment claimed.
• Ask a licensed customs broker or trade counsel to review ambiguous classifications, scope questions, or possible inclusion requests before filing.