Analysis
HTS 3507.90.70 covers other: other under heading 3507 (enzymes; prepared enzymes not elsewhere specified or included). US Customs collects import statistics for it under 2 ten-digit suffixes, reported in kilograms.
This line's footnotes point to one additional provision in Chapter 99: 9903.90.08 (measures on products of Russia). Chapter 99 duties are added on top of the general rate for goods of the countries they name, and they change more often than the rest of the schedule, so check the current CBP guidance before you rely on a total.
For statistics it divides in two: 3507.90.70.10 for enzymes – proteases, amylases, lipases, cellulases… and 3507.90.70.80 for other. Both pay the same duty; the suffix records which kind was imported.
The normal trade relations rate here is zero, shared by about 50% of the 14 tariff lines in chapter 35, a useful check when a neighbouring dutiable line is a candidate. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
Goods from countries without normal trade relations pay the column 2 rate of 25% instead of nothing, so origin decides between free entry and a 25% duty.
Statistical suffixes
| Code | Description | Units | NAICS |
|---|---|---|---|
| 3507.90.70.10 | Enzymes – proteases, amylases, lipases, cellulases, pectinases, oxidases, and catalases | kg | |
| 3507.90.70.80 | Other | kg |
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 3507.10.00 | Rennet and concentrates thereof | Free |
| 3507.90.20 | Pencillin G amidase | Free |
Chapter 99 provisions in the footnotes
- 9903.90.08 measures on products of Russia
Articles the product of the Russian Federation, as provided for in U.S. note 30(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 30(b) to this subchapter