TARIFF INTELLIGENCE PLATFORM • USMCA CORRIDOR

Data Sources & Methodology

Complete transparency on where our tariff intelligence comes from.
US • Mexico • Canada

Official Government Data Sources

BASE

U.S. International Trade Commission (USITC)

Harmonized Tariff Schedule of the United States (HTSUS) - The official source for all base MFN (Most Favored Nation) tariff rates and HS code classifications.

Update Frequency: Annual (January 1)
Coverage: 18,707 HS codes
Data Type: MFN rates, USMCA rates, descriptions
Authority: 19 U.S.C. § 1202
View Official HTS →
301

Federal Register - USTR Section 301

Section 301 tariffs on Chinese imports, published by the Office of the United States Trade Representative. Section 301 tariff applies to China/Hong Kong-origin goods at the rate set by the applicable USTR List or 2024 four-year review modification.

Update Frequency: Daily automated sync
Coverage: loading… HS codes
Exclusions: Active product exclusions can reduce the rate to 0% when matched to a Chapter 99 exclusion code. Mexico or Canada sourcing with USMCA qualification eliminates Section 301 entirely.
Legal Basis: USTR Section 301 Investigation; Lists 1-4A + 2024 four-year review modifications
View USTR Actions →
232

Federal Register - Commerce Section 232

National security tariffs on steel, aluminum, and copper, published by the Department of Commerce under presidential proclamation. 50% primary metal tariff on full customs value for steel (Ch.72), aluminum (Ch.76), copper (Ch.74). 25% derivative tariff on full customs value for Annex I-B articles (Ch.73 steel articles and metal content in other chapters).

Update Frequency: Daily automated sync
Coverage: loading… HS codes
Legal Basis: Apr 6 2026 Proclamation, "Strengthening Actions Taken To Adjust Imports of Aluminum, Steel, and Copper Into the United States" (signed 2026-04-02, effective 2026-04-06); Proc 9705/9704 as amended by Proc 10403
RATE TIERS (Chapter 99 subheadings):
  • 9903.82.02 — 50% primary metal tariff on full customs value for steel (Ch.72), aluminum (Ch.76), copper (Ch.74)
  • 9903.82.04 — 25% reduced primary-metal tariff for UK-origin steel/aluminum/copper with 85% UK melt/pour certification
  • 9903.82.05 — 15% reduced derivative tariff for UK-origin Annex I-B articles with 85% UK melt/pour
  • 9903.82.06 — 10% reduced tier for Annex I-B derivatives made from US-melted metal
  • 9903.82.09 — 25% derivative tariff on full customs value for Annex I-B articles (Ch.73 steel articles and metal content in other chapters)
  • 9903.82.10 — 15% transitional tariff on Annex III metal-intensive industrial/electrical-grid equipment (sunset 2027-12-31)
  • 9903.82.14 — 200% tariff on Russian-origin primary aluminum articles
  • 9903.82.20 — Canadian or Mexican melt earns no melt-based reduction on an Annex I-B derivative; USMCA-qualifying CA/MX derivative steel splits into a 0% line on the declared U.S. content and a +25% line on the balance
MELT / POUR ORIGIN, DERIVATIVE ARTICLES: US-melt derivatives reduce to 10% via 9903.82.06, which requires at least 85% of the steel content melted and poured in the United States (aluminum: smelted and cast in the US). Canadian or Mexican melt earns NO melt-based reduction on a derivative: USMCA-qualifying CA/MX derivative steel splits under HTSUS U.S. note 16(j) into 9903.82.21 (No change, 0%) on the declared U.S. content, capped at 40% of entered value, and 9903.82.20 (+25%) on the balance. With no declared U.S. content value the entire entry falls to the 25% line (9903.82.09). Otherwise full 25% applies.
Broker action: Provide a mill certificate stating country of melt and pour. Derivatives never get a full exemption: US melt reduces to 10% (9903.82.06); Canadian or Mexican melt earns no melt-based reduction, and the declared U.S. content value must be reported on entry or the whole shipment goes to the 25% line.
View Commerce Actions →
Section 122 (expired)

Federal Register - Section 122 (10% broad-based)

Emergency tariffs under Section 122 of the Trade Act of 1974, which expired on July 24, 2026. It replaced the IEEPA tariffs after the Supreme Court struck them down on February 20, 2026, and its own 150-day authority then ran out. 10% broad-based tariff on most US imports expired 2026-07-24 (9903.03.01).

Update Frequency: Daily automated sync
Coverage: loading… HS codes
Status: Expired 2026-07-24 — not charged on entries today
Legal Basis: 19 U.S.C. § 2132 (Section 122, Trade Act of 1974)
CURRENTLY APPLICABLE IN ITS PLACE: Section 301 forced-labor tariff of 10% or 12.5% (varies by investigated economy tier — see the resolved rate for this specific origin) applies to imports from 60 economies found to have failed to impose or effectively enforce a prohibition on the importation of goods produced with forced labor.
View CBP Guidance →
🇲🇽 MX

Mexican Government Sources (DOF)

Official Mexican trade regulations from the Diario Oficial de la Federación (DOF), including RGCE (Reglas Generales de Comercio Exterior), Anexos, IMMEX program rules, and NOM certification requirements.

Update Frequency: Daily DOF monitoring
Coverage: RGCE, Anexo 13/22, IMMEX, NOMs
Sources: DOF, SAT, Secretaría de Economía
Legal Basis: Ley Aduanera, RGCE 2026
Diario Oficial →Secretaría de Economía →
LIVE

USMCA Corridor Coverage

Triangle covers the US-Mexico-Canada corridor in depth: the full US duty stack (MFN + Section 301 + Section 232 + AD/CVD), Mexico LIGIE rates with IMMEX/PROSEC program intelligence, and Canada CBSA rates with CUSMA preferential treatment.

Corridor Comparison: US, Mexico, Canada. Find your lowest duty route across the corridor.

Automated Sync Methodology

Triangle automatically monitors official government sources and updates tariff rates daily. Here's how our sync process works:

Daily at 06:00 UTC: Federal Register API is queried for new USTR, Commerce, and CBP notices about tariff modifications.
  1. Search Federal Register API - Query for USTR (Section 301), Commerce (Section 232), and Executive Office documents from the past 90 days
  2. Parse Official XML - Extract HS codes and tariff rates directly from Federal Register XML tables (no AI interpretation for rates)
  3. Update Database - Upsert new rates to policy_tariffs_cache with source attribution and verification timestamps
  4. Log & Verify - Record sync results to audit log, flag any stale records for review
30-Day Notice Rule: Federal law requires at least 30 days notice before tariff rate changes take effect. Our daily sync ensures you always have current rates before they become effective.

Why Trust Triangle

100%
Government Sources

No third-party data. Every rate comes from official Federal Register or USITC sources.

Daily
Automated Updates

Federal Register is monitored every day at 06:00 UTC. No manual updates to forget.

Full
Audit Trail

Every rate includes source URL, verification date, and Federal Register document number.

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