{ "summary": "In the United States tariff, line 8540.99.40.00 covers parts, electron guns; radio frequency (RF) interaction structures for microwave tubes of subheadings 8540.71 through 8540.79, inclusive. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 8540.99 in heading 85.40 (chapter 85).", "updatedAt": "2026-10-09", "facts": [ { "label": "Tariff line", "value": "8540.99.40.00", "source": "https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false" }, { "label": "Covers", "value": "Parts, electron guns; radio frequency (RF) interaction structures for microwave tubes of subheadings 8540.71 through 8540.79, inclusive", "source": "https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false" }, { "label": "Duty (MFN)", "value": "Free", "source": "https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false" }, { "label": "Additional duties", "value": "None recorded", "source": null }, { "label": "Restrictions", "value": "None recorded", "source": null }, { "label": "Tariff", "value": "United States", "source": "https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false", "url": "https://border.bot/countries/united-states" }, { "label": "HS subheading", "value": "8540.99", "source": null, "url": "https://border.bot/hs-codes/854099" } ], "faq": [ { "question": "What does tariff line 8540.99.40.00 cover in the United States tariff?", "answer": "In the United States tariff, line 8540.99.40.00 covers parts, electron guns; radio frequency (RF) interaction structures for microwave tubes of subheadings 8540.71 through 8540.79, inclusive." }, { "question": "What is the general (MFN) duty on 8540.99.40.00 in the United States?", "answer": "Goods under this line enter free of general (MFN) duty." } ], "sections": [ { "id": "covers", "title": "What this line covers", "text": [ "In the United States tariff, line 8540.99.40.00 covers parts, electron guns; radio frequency (RF) interaction structures for microwave tubes of subheadings 8540.71 through 8540.79, inclusive.", "Its legal text is “Electron guns; radio frequency (RF) interaction structures for microwave tubes of subheadings 8540.71 through 8540.79, inclusive”, read under “Parts” and “Other”." ] }, { "id": "structure", "title": "How it is structured", "text": [ "It falls under HS subheading 8540.99 in heading 85.40 (chapter 85). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff." ] }, { "id": "duty", "title": "Duty", "text": [ "Goods under this line enter free of general (MFN) duty." ] }, { "id": "other-countries", "title": "In other countries", "text": [ "No other national tariff on border.bot has live lines under 8540.99 yet." ] }, { "id": "sources", "title": "Sources and updates", "text": [ "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. 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