Import duty / Chapter 29 / Heading 2933
Heading 2933 covers 27 tariff lines in LoadLoom's table; 17 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 |
|---|---|---|---|---|
| 2933.11 | Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, phenazone (antipyrin) and its derivatives | 6.5% | Free | Free with certificate |
| 2933.19 | Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring (whether or not hydrogenated) in the structure, other than henazone (antipyrin) and its derivatives | Free | Free | Not eligible |
| 2933.21 | Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, hydantoin and its derivatives | 6.5% | Free | Free with certificate |
| 2933.29 | Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives | Free | Free | Not eligible |
| 2933.31 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts | Free | Free | Free with certificate |
| 2933.32 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, piperidine and its salts | 6.5% | Free | Not eligible |
| 2933.33 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN) | Free | Free | Free with certificate |
| 2933.34 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, other fentanyls and their derivatives | 6.5% | Free | Free with certificate |
| 2933.35 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 3-quinuclidinol | 5.8% | Free | Free with certificate |
| 2933.36 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, 4-anilino-N-phenethylpiperidine (ANPP) | 6.5% | Free | Free with certificate |
| 2933.37 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, N-phenethyl-4-piperdone (NPP) | 6.5% | Free | Free with certificate |
| 2933.39 | Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3 | Free | Free | Not eligible |
| 2933.41 | Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, levorphanol (INN) and its salts | Free | Free | Free with certificate |
| 2933.49 | Heterocyclic compounds; containing a quinoline or isoquinoline ring-system (whether or not hydrogenated) in the structure, not further fused, other than levorphanol (INN) and its salts | 6.5% | Free | Not eligible |
| 2933.52 | Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, malonylurea (barbituric acid) and its salts | Free | Free | Not eligible |
| 2933.53 | Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof | Free | Free | Free with certificate |
| 2933.54 | Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, other derivatives of malonylurea (barbituric acid) and salts thereof, n.e.c. in 2933.53 | 3.7% | Free | Free with certificate |
| 2933.55 | Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure; loprazolam (INN), mecloqualone (INN), methaqualone (INN), and zipeprol (INN); salts thereof | Free | Free | Free with certificate |
| 2933.59 | Heterocyclic compounds; containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, (other than malonylurea and its derivatives, loprazolam, mecloqualone, methaqualone, zipeprol, and salts thereof) n.e.c. in 2933.5 | 6.5% | Free | Not eligible |
| 2933.61 | Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, melamine | 3.5% | Free | Free with certificate |
| 2933.69 | Heterocyclic compounds; containing an unfused triazine ring (whether or not hydrogenated) in the structure, others excluding melamine | Free | Free | Not eligible |
| 2933.71 | Heterocyclic compounds; lactams; 6-hexanelactam (epsilon-caprolactam) | 6.5% | Free | Free with certificate |
| 2933.72 | Heterocyclic compounds; lactams; clobazam (INN) and methyprylon (INN) | Free | Free | Free with certificate |
| 2933.79 | Heterocyclic compounds; lactams; other than 6-hexanelactam (epsilon caprolactam) and clobazam (INN) and methyprylon (INN) | Free | Free | Not eligible |
| 2933.91 | Heterocyclic compounds; alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), (cont) | Free | Free | Free with certificate |
| 2933.92 | Heterocyclic compounds; azinphos-methyl (ISO) | Free | Free | Free with certificate |
| 2933.99 | Heterocyclic compounds; n.e.c. in headings no. 2933 | Free | 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.
