Section XVI Tariff Guide: Machinery, Electronics & Electrical Equipment — 2026 HTS Import Duties

HTS Section XVI — covering Chapters 84 (Nuclear Reactors, Boilers, Machinery and Mechanical Appliances) and 85 (Electrical Machinery and Equipment) — is the single largest section in the Harmonized Tariff Schedule, comprising 929 six-digit subheadings. For US importers, these two chapters account for over 40% of all customs entries by value. Misclassification here is the #1 trigger for CBP audits.

Chapter 84: Industrial Machinery at a Glance

Chapter 84 covers everything from nuclear reactors to HVAC equipment to computer hardware. Key classification principles:

• Heading 8402-8404: Boilers, central heating — duty rates 2.5-5.5%, with most FTA partners qualifying for Free
• Heading 8414: Air pumps, compressors, fans — often misclassified. CBP ruling HQ H312456 (2025) confirmed that vacuum pumps with integrated motors are classified under 8414.10, not 8501
• Heading 8471: Computers and data processing machines — Free under WTO Information Technology Agreement (ITA), but accessories (monitors, keyboards) may fall under different headings
• Heading 8481: Valves — one of the most litigated headings. CBP ruling HQ H297831 clarified that solenoid valves for automotive fuel systems are 8481.80, not 8409.99

Chapter 85: Electronics — The Section 301 Battleground

Chapter 85 covers the electronics that have been at the center of US-China trade disputes. Key areas:

• Heading 8501: Electric motors and generators — Section XVI Note 2(a) means parts suitable for use solely with a particular machine are classified with that machine
• Heading 8517: Smartphones, networking gear — heavily impacted by Section 301 List 3 (25% additional duty on Chinese-origin goods). CBP ruling HQ H310245 (2026) on 5G base station classification under 8517.61 vs 8517.62
• Heading 8528: Monitors and projectors — the critical distinction between computer monitors (8471.60 if exclusively for ADP machines) and video monitors (8528.52 for LCD flat panels)
• Heading 8541-8542: Semiconductors, ICs — ITA-eligible for Free. But packaging, testing, and assembly in China may affect country of origin for Section 301 purposes

Section 301 Impact on Section XVI

The USTR Section 301 tariff lists hit Section XVI products harder than any other HTS section. As of 2026:

Critical compliance note: Many Section XVI products qualify for Chapter 99 exclusions (temporary or product-specific). Always check the latest USTR exclusion list before applying Section 301 duties. A lapsed exclusion retroactively restores the duty.

FTA Opportunities for Section XVI Importers

• USMCA: Most Chapter 84-85 goods qualify for Free if they meet regional value content (RVC) rules. The USMCA origin certification is self-issued — no government stamp required
• US-Korea FTA (KORUS): Korean semiconductors, displays, and automotive electronics qualify for Free under the ITA and KORUS overlap
• US-Singapore FTA: Singapore is a major semiconductor hub. Most ITA products from Singapore enter duty-free via dual FTA+ITA qualification

Common Classification Errors in Section XVI

1. Parts vs. Accessories: Section XVI Note 2 governs parts classification. A part identifiable for use solely with a Section XVI machine is classified under that machine's heading — but this doesn't apply to interchangeable tools (Chapter 82) or parts of general use (Chapter 73)
2. Functional Units: When multiple machines work together as a single functional unit, they're classified under the heading of the principal function
3. Multi-function Machines: Classification is by principal function. If no single function predominates, use the heading occurring last in numerical order (GRI 3(c))

Pro Tip: If you import products falling under HTS headings 8401-8487 or 8501-8548 and are unsure about your classification, consult our full HTS database to verify each subheading's duty rates, FTA eligibility, and related CBP rulings.