What Chapter 99 (9903) subheading applies to HTS 8409.91.9990?

The following Chapter 99 subheadings apply to HTS 8409.91.9990 for Chinese-origin shipments: 9903.88.03. These subheadings must be declared on the entry summary when the applicable trade action is in effect.

HTS CODE

8409.91.9990

Parts suitable for use solely or principally with the engines of heading 8407 or 8408 —…

Q: What is the current import duty rate for HTS 8409.91.9990?

The current effective duty rate for HTS 8409.91.9990 (Parts suitable for use solely or principally with the engines of heading 8407 or 8408 —…) from China (CN) is 27.5%, composed of 2.5% MFN base rate plus trade action overlays: 9903.88.03.

Current Rate BreakdownNo rate change since July 4, 2026

Stacked duty rate composition — CN origin
Component	Rate
MFN BASE RATE	2.5%
SECTION 3019903.88.03	25.0%
TOTAL EFFECTIVE RATE	27.5%

Source:USITC Harmonized Tariff Schedule ↗· as of the daily check on October 4, 2026

Overlays resolved from Chapter 99 U.S. Notes — Chapter 99 trade-action overlays resolved from the U.S. Notes to Chapter 99 (parsed 2026-10-02). The USITC schedule no longer publishes per-code references, so coverage comes from the note lists directly; USTR product exclusions at the statistical-suffix level may still apply — verify before filing.

Where this code sits in the schedule

8409Parts suitable for use solely or principally with the engines of heading 8407 or 8408
8409.91Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines)
8409.91.99Other
8409.91.99.90Other

Next to this line in heading 8409

Each line’s own MFN general rate.

8409.91.92For marine propulsion engines2.5%
8409.91.99Other2.5%
8409.91.99.90Other
8409.99.10Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machineryFree
8409.99.91To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 87042.5%

OTHER USITC RATE COLUMNS

Special (FTA/preference): "Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)" — preference programs only; not the rate for an ordinary shipment.

Column 2 (non-MFN): "35%" — for countries without normal trade relations; not the rate for an ordinary shipment.

ABOUT THIS CODE

HTS 8409.91.9990, filed for CN-origin shipments under "Parts suitable for use solely or principally with the engines of heading 8407 or 8408 —…", sits in Chapter 84 (Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof). Within heading 8409, the schedule files 8409.91.99.90 after 8409.91.92 ("For marine propulsion engines", 2.5%) and 8409.91.99 ("Other", 2.5%) and before 8409.99.10 ("Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery", Free) and 8409.99.91 ("To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704", 2.5%). Stacked for 8409.91.9990: 2.5% MFN general duty plus 25% under Section 301 (9903.88.03) = 27.5%. Rate history for 8409.91.9990: no change detected since HTSAlert began monitoring this Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof line.

Related codes in Chapter 84

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