HTS Heading 8408

Compression-ignition internal combustion piston engines (diesel or semi-diesel engines)

All 17 HTS codes under heading 8408 (compression-ignition internal combustion), with their duty rates from the 2026 HTS Revision 23. General duty Free to 2.5%.

Every line of heading 8408

  • 8408 Compression-ignition internal combustion piston engines (diesel or semi-diesel engines).
  • 8408.10.00 Marine propulsion engines (under: Compression-ignition internal combustion piston engines (diesel or semi-diesel engines)): General 2.5%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8408.10.00.05 Not exceeding 111.9 kW (under: Marine propulsion engines) (No.).
  • 8408.10.00.15 Exceeding 111.9 kW but not exceeding 149.2 kW (No.).
  • 8408.10.00.20 Exceeding 149.2 kW but not exceeding 223.8 kW (No.).
  • 8408.10.00.30 Exceeding 223.8 kW but not exceeding 373 kW (No.).
  • 8408.10.00.40 Exceeding 373 kW but not exceeding 746 kW (No.).
  • 8408.10.00.50 Exceeding 746 kW (under: Marine propulsion engines) (No.).
  • 8408.20 Engines of a kind used for the propulsion of vehicles of chapter 87.
  • 8408.20.10 To be installed in tractors suitable for agricultural use: General Free; Special none; Column 2 Free.
  • 8408.20.10.40 Not exceeding 37.3 kW (under: To be installed in tractors suitable for agricultural use) (No.).
  • 8408.20.10.80 Exceeding 37.3 kW (under: To be installed in tractors suitable for agricultural use) (No.).
  • 8408.20.20.00 To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 (No.): General 2.5%; Special Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8408.20.90.00 Other (under: Engines of a kind used for the propulsion of vehicles of chapter 87) (No.): General 2.5%; Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8408.90 Other engines (under: Compression-ignition internal combustion piston engines (diesel or semi-diesel engines)).
  • 8408.90.10 To be installed in agricultural or horticultural machinery or equipment: General Free; Special none; Column 2 Free.
  • 8408.90.10.40 Not exceeding 37.3 kW (under: To be installed in agricultural or horticultural machinery or equipment) (No.).
  • 8408.90.10.80 Exceeding 37.3 kW (under: To be installed in agricultural or horticultural machinery or equipment) (No.).
  • 8408.90.90 Other (under: Other engines): General Free; Special none; Column 2 35%.
  • 8408.90.90.10 Not exceeding 149.2 kW (under: Other) (No.).
  • 8408.90.90.20 Exceeding 149.2 kW but not exceeding 373 kW (No.).
  • 8408.90.90.30 Exceeding 373 kW but not exceeding 746 kW (No.).
  • 8408.90.90.40 Exceeding 746 kW but not exceeding 1,119 kW (No.).
  • 8408.90.90.50 Exceeding 1,119 kW (under: Other) (No.).

From MFG Calcs data: Internal combustion engines

U.S. imports of internal combustion engines (headings 8407, 8408, 8409) came to $27.69B in 2025, with $3.49B in calculated duty: an effective duty of 12.6%, every duty included.

Effective duty in Sep 2026: 7.9%, against 20.0% in Sep 2025.

Largest sources in 2025: Mexico $9.95B at 9.3% effective duty; Japan $3.72B at 13.7% effective duty; Canada $3.44B at 2.7% effective duty; Germany $2.05B at 14.3% effective duty; South Korea $1.70B at 7.6% effective duty.

These are family totals from U.S. import statistics published through USITC DataWeb, not this heading's rate alone; effective duty is calculated duty as a share of customs value, an estimate, not a ruling.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.