Key facts
- HS subheading
- 8540.71
- National lines
- 2
- Tariff
- United States
- Chapter
- 85: Electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles
Summary
The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other). The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.
United States lines under 8540.71
The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other).
The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.
- 8540.71.20.00Modified for use as parts of microwave ovensDuty: Free
- 8540.71.40.00OtherDuty: 3.7%
In other countries
No other national tariff on border.bot has live lines under 8540.71 yet.
Frequently asked questions
How many national tariff lines does the United States tariff have under HS 8540.71?
The United States tariff splits HS 8540.71 (microwave tubes (for example, magnetrons, klystrons, travelling-wave tubes, carcinotrons), excluding grid-controlled tubes: Magnetrons) into 2 national lines: 8540.71.20.00 (modified for use as parts of microwave ovens) and 8540.71.40.00 (other).
What is the duty on HS 8540.71 in the United States?
The general (MFN) duty differs by line: free on 8540.71.20.00 and 3.7% on 8540.71.40.00.
Sources and updates
The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.
This page was last updated on 9 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.
Official source files: