US Tariffs in H2 2026: Why Your Direct Procurement Numbers Need Recalculating

US tariffs affect procurement costs by taxing full customs value, not just metal content. The tariff impact on direct procurement in 2026 is structural, and most teams have not caught up. Section 232 duties now reach 50% on metals and 25% on autos and semiconductors, while USTR added new tariffs in July.

This shift matters most for teams running a discrete manufacturing procurement platform, where direct spend concentration raises the stakes. This post covers what changed, why your landed cost model is now wrong, the three numbers to recalculate, and what it means for your supplier base.

What Changed in H2 2026

The tariff impact on direct procurement in H2 2026 starts with a structural change. Since April 6, 2026, Section 232 duty applies to the full customs value of covered metal goods, not just the metal content. This raises the effective cost of many imports, even where the tariff rate looks unchanged. Section 232 duty is tiered by metal content. Full-metal steel and aluminium articles carry a 50% duty and derivative products above 15% metal content carry 25% instead. Automobiles, covered auto parts, and covered semiconductors carry a 25% duty.

This marks a sharp rise in commodity risk in direct procurement that now needs tracking. It also reflects a broader pattern in US tariff supply chain manufacturing exposure this year.

Proclamation 11032 then extended this regime through December 31, 2027. It lowered the US-content threshold from 95% to 85% and added new derivatives, including steel racks. Semiconductors joined the list on January 15, 2026, at 25%. The auto parts coverage keeps widening. Domestic producers of automobiles or automobile parts articles, or any industry association can submit inclusion requests in a 2-week submission window. The window opens four times annually at the beginning of each January, April, July, and October.

On top of that, USTR opened a new front in July 2026. It imposed a 25% tariff on Brazilian goods effective July 15, and 10 or 12.5% tariffs on 60 economies over forced-labor findings, effective July 24. Together, these changes widen both the rate, and the base duty applies to. That shift is where most procurement cost models for tariffs break.

Why Your Landed Cost Model Is Now Wrong

Your landed cost model is wrong because it still prices tariffs as a flat rate on unit price. That assumption broke on April 6, 2026, when Section 232 duty shifted to the full customs value of covered metal goods, not just the metal content. Thus, every landed cost calculation of tariffs needs five specific inputs to be recalculated.

• Unit price: Duty is charged on the full entered value. So, a lower metal-content share no longer lowers the duty base.
• Supplier origin classification: For USMCA-eligible derivative steel articles from Canada and Mexico, a 25% duty applies to non-U.S. content of derivative steel articles, and to any U.S. content that exceeds 40% of the value of the article. A 15% duty applies to derivative steel products of Argentina, Ecuador, El Salvador, Guatemala, Japan, the Republic of Korea, Switzerland, Taiwan, UK, or a member nation of the European Union.
• HS code changes: The United States International Trade Commission published the 12th revision of the Harmonized Tariff Schedule on July 21, 2026. Each revision can move a product’s classification and its duty exposure.
• Duty drawback eligibility: Section 232 duties imposed on any aluminium or steel articles are not eligible for drawback. This removes a recovery option many teams still build into duty drawback procurement planning. Thus, models assuming partial recovery through drawback are overstating net cost.
• Lead-time buffers: The auto-parts inclusion list can expand every quarter: January, April, July, October. This can result in adding parts to tariff scope with each cycle. Sourcing decisions made before an inclusion round can face new duty on the next shipment.

Three Numbers Your Procurement Team Needs to Recalculate

Three numbers now drive direct procurement cost recalculation at every US manufacturer. Together they quantify tariff risk across direct spend. Recalculate them before your next CFO briefing.

• Landed cost per unit by supplier origin: Supplier origin changes the whole calculation. USMCA-qualifying Canadian and Mexican steel derivatives pay 25% on non-US content. A 15% duty applies to derivative steel products of Argentina, Ecuador, El Salvador, Guatemala, Japan, the Republic of Korea, Switzerland, Taiwan, UK, or a member nation of the European Union.
• Tariff exposure as a percentage of direct spend by category: Steel and aluminium products face the highest effective tariff rates at 41.2%, followed by automotive vehicles at 13.5%. The tariff exposure of certain categories is higher and thus they need a separate cost line. Mapping the supply chain tariff exposure in 2026 by category, rather than by a blended average, is what separates an accurate model from a stale one.
• Safety stock cost uplift from extended lead times: The auto parts inclusion window opens quarterly: January, April, July and October. Parts sourced just before a window can face new duty on the next shipment. So, buffer stock needs pricing against that cycle, not against historical lead times alone.

What This Means for Your Supplier Base

Concentration in tariff-affected origins is a direct cost risk now. The impact of tariffs on manufacturing procurement now shows up first in supplier concentration. China-origin goods face a tariff rate of 23.4%, the highest of any major trading partner. It is a clear signal of where US tariff supply chain manufacturing risk now concentrates. As a result, diversification is already underway. 83.8% of Canadian and Mexican imports now claim a USMCA exemption, up from historical norms. This shift points toward nearshoring procurement complexity in 2026 as teams rebuild supplier bases around origin rules rather than price alone.

But diversification leads to the data visibility problem. Most procurement teams don’t hold the sub-tier data Customs and Border Protection now requires. Since April 2026, CBP requires importers of covered copper, steel, and aluminium articles to report the country of smelt and country of cast along with country of shipment. Steel and aluminium carry the same requirement and most procurement teams do not have the data.

US Tariffs & Direct Procurement: FAQ

Next Steps

The impact of tariffs on manufacturing procurement comes down to three moving numbers. Recalculating landed cost, tariff exposure, and safety stock is a spreadsheet exercise until supplier-origin data updates as fast as tariff schedules do. The JAGGAER source-to-pay platform covers BOM-driven direct materials sourcing and tariff and geopolitical risk modelling on one data layer, built for manufacturing supply chains.