SEAMAC SHIPPING, INC.

SeaMac Shipping, Inc. holds a CBP customs broker license (filer code NX4) and operates as both a customs house broker and international freight forwarder at the Port of Charleston, South Carolina. The firm is headquartered at 215 East Bay Street, placing it close to Charleston's active waterfront terminal — one of the busiest container ports on the Eastern Seaboard and a major gateway for goods moving between Asia, Europe, and the U.S. Southeast.

For importers searching for a customs broker near the Port of Charleston, SeaMac offers end-to-end transaction management covering both the logistics and compliance sides of international trade. The firm handles customs entry preparation for formal and informal entries, helping clients understand the distinction between formal vs informal entry customs thresholds and ensuring the correct classification of goods using the 10-digit HTS code system. Proper HTS classification is foundational to calculating duties correctly, and SeaMac's staff is trained to navigate schedule B vs HTS code considerations for both import and export documentation.

SeaMac's services include importer security filing — commonly known as ISF 10 plus 2 filing — which must be submitted to CBP at least 24 hours before cargo is loaded aboard a vessel bound for the U.S. Missing or late ISF filings can result in significant penalties, making experienced broker support critical for ocean importers. The firm also assists clients with import bond requirements, including the difference between a single entry bond and a continuous customs bond, advising importers on which instrument best fits their shipment frequency and risk profile.

With documented staff presence in both North America and Asia, SeaMac is well-suited for importers bringing goods from Asian manufacturing hubs — a trade lane that flows heavily through Charleston due to its deep-water terminal infrastructure and growing capacity. The firm handles capital equipment and a range of commercial goods, suggesting familiarity with formal entry procedures for higher-value cargo.

For eligible importers, SeaMac can also provide guidance on duty recovery options, including unused merchandise drawback and manufacturing drawback customs programs. Duty drawback remains one of the most underutilized tools available to U.S. importers and exporters, and working with a broker who understands these programs can result in meaningful tariff refunds. Whether a shipment qualifies under a duty drawback program depends on the commodity, end use, and export documentation — all areas where experienced customs broker representation adds measurable value.

Importers looking for licensed customs broker services at the Port of Charleston will find SeaMac Shipping, Inc. to be an established local option with the freight forwarding capabilities to manage cargo from origin to customs clearance.