How to Check a BOM for Section 301 Tariff Exposure (2026 Guide)
A practical guide to finding US Section 301 tariff exposure in an electronics Bill of Materials — what Section 301 is, why country-of-origin (not purchase point) decides it, and how to screen every component quickly.
A component can clear every compliance check and still quietly damage your margin. US Section 301 tariffs can add double-digit percentages to a component's landed cost, and the exposure rides on where the part is actually made — not where you bought it. Most BOM reviews never look, and the first time anyone finds out is on an invoice. This guide explains what Section 301 is, why country-of-origin is the question that matters, and how to screen an entire BOM for tariff exposure in minutes.
What Section 301 actually is
Section 301 of the US Trade Act of 1974 lets the United States impose additional duties on specific goods from specific countries, layered on top of the normal HTS (Harmonized Tariff Schedule) duty. For electronics, the practical effect is that two otherwise-identical parts can carry very different landed costs purely because of their country of origin. The affected product lists and rates change by action and periodic review, so exposure is a moving target — not a fixed, one-time lookup.
- Section 301
- A US trade measure that adds extra duties on top of the base HTS rate for goods originating in targeted countries. Distinct from RoHS/REACH compliance — this is a cost-and-trade exposure, not a substance restriction.
- Country of origin
- Where the goods were actually manufactured or substantially transformed. This — not the distributor or ship-from warehouse — determines tariff liability.
- Landed cost
- The true delivered cost of a component once duties, including any Section 301 add-on, are applied. A part that looks cheap on a quote can land materially more expensive.
Why "where I bought it" is the wrong question
Tariff liability follows the country of origin of the goods, not the distributor you purchased from or the warehouse they shipped from. A part stocked by an EU or US distributor can still originate from a tariff-affected country. A BOM that lists only manufacturer and MPN hides this entirely — the origin lives one layer deeper than most spreadsheets capture.
Section 301 exposure is not static. Product lists and rates are revised through ongoing US Trade Representative actions and reviews, so a BOM judged "clear" at design freeze can pick up exposure later. Re-screening as the BOM and the trade actions evolve is the only reliable way to stay ahead.
How to check a BOM for tariff exposure, step by step
- Export your BOM as CSV or Excel, with at least the manufacturer part number and manufacturer name per line.
- Upload it — columns are auto-mapped, no template required.
- Each component is resolved to a manufacturer and country of origin.
- Review the Geopolitical dimension: parts carrying tariff or country-of-origin exposure are flagged.
- Export a PDF or Excel report to hand to procurement, finance, or your customs broker.
What TekPulse flags (and what it doesn't)
TekPulse surfaces country-of-origin and tariff exposure on the Geopolitical dimension, component by component, to tell you which parts warrant a customs and classification review. It is a risk-screening signal designed to focus attention — not a substitute for a formal customs determination.
This is a risk-screening signal, not a customs ruling. Final HTS classification and the exact duty owed should be confirmed with your customs broker or trade counsel — TekPulse points you at the components that need that review, it does not replace it.
Tariffs are one dimension of five
Tariff exposure is one flag. The same upload also scores regulatory compliance (RoHS 2 and REACH SVHC), market availability, technical lifecycle (EOL/NRND), and environmental indicators — then rolls all five dimensions into one weighted score with a ranked "fix this first" list, so a margin risk and an obsolescence risk land in the same view.
Your BOM is encrypted with a per-company key (AES-256-GCM) before it touches the database, isolated per company, and processed under EU data residency and GDPR. Our staff cannot read your data.