# United States tariff lines under HS 8404.90

> The United States tariff splits HS 8404.90 (parts) into 1 national line: 8404.90.00.00 (parts). The general (MFN) duty is 3.5% on this line.

Source: https://border.bot/countries/united-states/hs-codes/840490
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8404.90](https://border.bot/countries/united-states/hs-codes/840490)

## Key facts

- HS subheading: [8404.90](https://border.bot/hs-codes/840490)
- Duty (MFN): 3.5%
- National lines: 1
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8404.90

The United States tariff splits HS 8404.90 (parts) into 1 national line: 8404.90.00.00 (parts).

The general (MFN) duty is 3.5% on this line.

- [8404.90.00.00](https://border.bot/countries/united-states/hs-codes/8404900000) Parts. Duty (MFN): 3.5%

## In other countries

No other national tariff on border.bot has live lines under 8404.90 yet.

- [The Harmonized System text for 8404.90](https://border.bot/hs-codes/840490)

- Previous subheading: [8404.20](https://border.bot/countries/united-states/hs-codes/840420) Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof
- Next subheading: [8405.10](https://border.bot/countries/united-states/hs-codes/840510) Producer gas or water gas generators, with or without their purifiers; acetylene gas generators and similar water process gas generators, with or without their purifiers; parts thereof

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8404.90?

The United States tariff splits HS 8404.90 (parts) into 1 national line: 8404.90.00.00 (parts).

### What is the duty on HS 8404.90 in the United States?

The general (MFN) duty is 3.5% on this line.

## 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:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/840490.json