Analysis
Subheading 8518.40 covers audio-frequency electric amplifiers, within heading 8518. The first six digits are shared by every country that uses the Harmonized System, so this part of the code is the same in the US, UK and EU schedules; the 2 US tariff lines below it are national.
Every one of its 2 tariff lines is duty-free at the general rate, so classification within the subheading affects statistics and Chapter 99 measures rather than the base duty.
The US splits it as follows: 8518.40.10 for for use as repeaters in line telephony (duty-free) and 8518.40.20 for audio-frequency electric amplifiers: other (duty-free).
By Census's concordance, most of its statistical lines are made by Telephone Apparatus Manufacturing (334210) and Audio and Video Equipment Manufacturing (334310). Those are the NAICS industries a US producer of these goods would report under.
Goods only reach 8518.40 once they fall within heading 8518 (microphones and stands therefor; loudspeakers, whether or not mounted in their…). Under General Rule 6, subheadings are then compared only with others at the same level, so a product is matched against its siblings, not against lines elsewhere in the chapter.
Tariff lines
| Line | Description | General rate |
|---|---|---|
| 8518.40.10 | For use as repeaters in line telephony | Free |
| 8518.40.20 | Audio-frequency electric amplifiers: other | Free |