US imports of Heterocyclic compounds with nitrogen hetero-atom only

US imports under HTS 2933 at a glance

Between March and July 2026, US importers entered $2.20 billion of heterocyclic compounds with nitrogen hetero-atom only under HTS heading 2933, from 38 of the 55 origin countries covered here and across 116 ten-digit tariff lines — roughly $439 million a month of customs value under a single four-digit heading.

Heading 2933 sits in chapter 29, organic chemicals, so anything classified here shares a duty structure with the rest of that chapter.

Who exports heterocyclic compounds with nitrogen hetero-atom only to the United States

China is the largest origin with $522 million, or 23.8% of the heading, with India at 15.2% and Switzerland at 11.5%. The top three take 50.5% between them — enough concentration to matter when one origin's duty treatment changes, but not so much that a buyer has no alternative to qualify.

European origins account for 32.7% of the heading, led by Germany, Ireland and Spain. Supply from Europe here tends to be specification-driven rather than price-driven, and the shipments are smaller and more frequent than the volumes further down the table.

What importers actually paid in duty

Duty treatment is split. 65.7% of the entered value was dutiable and the rest came in free, usually under a trade agreement or a duty-free provision in the tariff schedule. CBP collected $120 million in all, an effective 8.3% on the dutiable value and $5.46 per $100 of goods once the free entries are counted.

The spread between origins is real. Among origins with at least 2% of the heading, Germany paid the most duty relative to value — $8.47 per $100 — while Belgium paid $0.44. On a $250,000 purchase order that gap is about $20,000 in duty alone, which is worth pricing into a sourcing decision rather than discovering on the entry summary.

The 10-digit lines under heading 2933

116 ten-digit lines carried trade under this heading in the period. The largest, 2933.19.23.00, took 10.4% of the heading at $228 million. 2933.99.53.00, 2933.99.22.00 and 2933.99.79.00 follow. Rates diverge between those lines, so the classification your broker files is worth checking against the goods rather than carried over from the last entry.

What the duty stack looks like

The rate on an entry is not one number. It is a stack: the general (column 1) rate for the 10-digit line, less any trade-agreement preference the goods qualify for, plus whatever additional duties apply to that product and origin, all applied to the customs value declared. The $5.46 per $100 above is what that stack averaged across every entry in this heading — a benchmark, not a quote.

For the origins carrying the most volume, the per-country breakdowns go a level deeper: China (2933.99.79), India (2933.19.23) and Switzerland (2933.19.23). To price a specific shipment, put your 10-digit code and country of origin into the tariff simulator.

What this means for your next shipment

Classify first, confirm origin second, quote freight third. A heading like 2933 rewards that order, because the duty differences between lines and between origins are usually larger than the freight differences on the same lane. Airlift USA handles the freight and coordinates classification and entry through our licensed broker network.

For the operational side rather than the tariff side, see the Chemicals & Hazardous Goods Commodities guide for how this cargo moves, the China to USA lane for transit times and ports and the heading index to compare against the rest of chapter 29.