Import duty / Chapter 39 / Heading 3903
Heading 3903 covers 5 tariff lines in LoadLoom's table; 4 of them clear duty-free under USMCA for goods made in Canada, the US or Mexico. Published US and Canadian rates below, verified October 2026. Pick the line that matches your goods for the worked example and border steps.
| HS code | Goods | US duty | Canada duty | USMCA |
|---|---|---|---|---|
| 3903.11 | Styrene polymers; expansible polystyrene, in primary forms | 6.5% | Free | Free with certificate |
| 3903.19 | Styrene polymers; (other than expansible polystyrene), in primary forms | 6.5% | Free | Free with certificate |
| 3903.20 | Styrene polymers; styrene-acrylonitrile (SAN) copolymers, in primary forms | 6.5% | Free | Free with certificate |
| 3903.30 | Styrene polymers; acrylonitrile-butadiene-styrene (ABS) copolymers, in primary forms | 6.5% | Free | Free with certificate |
| 3903.90 | Styrene polymers; in primary forms, n.e.c. in heading no. 3903 | 6.5% | Free | Not eligible |
This page is a free reference for shippers, not a customs ruling. Final classification and duty are determined by the licensed customs broker at entry, and government amounts are always billed at actual. Rates change with each tariff edition and trade action.
