U.S. exports of Inboard & Inboard/Outdrive Engines for Marine Propulsion (HS 840729) totaled $5.3M in August 2026.
Importers of Inboard & Inboard/Outdrive Engines for Marine Propulsion paid $16K in duties in August 2026, an average duty rate of 2.27% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Inboard & Inboard/Outdrive Engines for Marine Propulsion imports of $695K in August 2026 ran 35% below the year-to-date monthly average of $1.1M.
Last updated: August 2026 dataSpark-ignition inboard and stern-drive (inboard/outdrive) marine engines fall under heading 840729, with five 10-digit lines covering inboard/outdrive configurations (8407290010), sub-746 W units (8407290020), engines in the 746 W–18.65 kW range (8407290030), other inboard configurations (8407290040), and dedicated inboard-drive engines (8407290050). Canada and Germany lead US supply, reflecting both cross-border OEM sourcing and European performance marine engine brands. Unlike outboard engines, inboard units are often installed at the boatbuilder level, so commercial importers are frequently vessel manufacturers rather than aftermarket distributors.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
14 import shipments a month
An inboard/outdrive (stern-drive) configuration has the engine mounted inside the hull but drives through a steerable outdrive unit at the transom, classified under 8407290010. A pure inboard engine with a fixed shaft and rudder system falls under 8407290050. The drive configuration — not engine displacement — is the primary classification criterion, so technical documentation from the manufacturer specifying the drive type is essential.
Canada is the leading supplier of inboard marine engines to the US. Engines that qualify as originating goods under USMCA rules of origin — meeting applicable tariff-shift and regional value content requirements — are eligible for preferential duty treatment. Importers must obtain and retain a valid USMCA certification of origin to claim the preference at entry.
Trade Directory
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Subheading 4 of 8 in heading 8407
Subheading 840729 · $5.3M of $693.6M
ImportsExports
Imports
$695KYoY · free account
Exports
$5.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $12.2M of Inboard & Inboard/Outdrive Engines for Marine Propulsion and exported $65.6M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8407290010 | Spk-Ign Rec or Rot Int Com Pst Eng, Mar, In/Outboard | $527K | 0.00% | 0.00% | -- |
| 8407290040 | Spk-Ign Rec or Rot Int Com Pst Eng, Mari, In/Inbord | $127K | 10.00% | 100.00% | $13K |
| 8407290020 | Spk-Ign Rec/Rot Int Com Pst Eng, Marn, Lt 746w | $38K | 7.39% | 73.89% | $3K |
| 8407290030 | Spig Rec/Rt Int Com Pst, Marn, Inbd(746w-18.65kw) | $3K | 10.00% | 100.00% | $300 |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8407290010 | Spk-Ign Rec or Rot Int Com Pst Eng, Mar, In/Outdrive | $4.8M |
| 8407290050 | Inboard Eng With Inboard Drive F Marine Propulsion | $554K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Brazil and Sweden together take 53% of it.
customs district
origin
entry
rate provision · imports
77.3% enters free of duty; duty collected equals 2.27% of imports for consumption.