Tariffs and Fleets: The Hidden Driver of Rising Costs

By Michael Taylor, Managing Partner, Diakon Partners

Originally published September 12, 2025 · Updated October 17, 2026

Adapted and updated from the author’s original LinkedIn article.

Updated October 17, 2026: Current incentive deadlines and practical guidance for managing fleet tariff exposure. Sources and revision details appear at the end.

Why Tariffs Matter to Fleet Budgets

Trade policy reaches a fleet through the price of a replacement vehicle, a repair invoice, or the cost of equipping a depot. By the time a surcharge appears, the replacement schedule and budget may already be set.

Fleet leaders need to know where those costs originate, what the supplier can substantiate, and how the purchase affects service reliability. A higher quote may reflect tariffs, materials, freight, or several factors together. Separating them is the starting point for a sound decision.

Understanding Tariffs in Plain English

At its core, a tariff is a tax on imported goods. The United States Customs and Border Protection (CBP) collects these duties when shipments arrive. Applicable duties depend on U.S. tariff classification, origin, entry timing, and the requirements of each trade measure.

The Harmonized System (HS) groups traded goods into internationally recognized product categories. Unlike a vehicle identification number, an HS code describes a class of goods rather than a unique item. The U.S. HTS adds more detailed classifications for U.S. tariff and statistical purposes. A brake rotor, wiring harness, telematics modem, or an entire truck requires its own classification analysis. For U.S. imports, the Harmonized Tariff Schedule (HTS) provides the relevant tariff subheadings; a code alone does not establish the complete duty liability.

For fleet managers, this means tariff exposure is rarely limited to finished vehicles. It extends across the thousands of parts, assemblies, and subcomponents that keep fleets operating every day — a cost layer that often remains hidden until bids are submitted or invoices arrive.

Key Tariff Categories Affecting Fleets

Different trade measures can affect different parts of the same fleet investment. A single percentage applied across all vehicles, batteries, or metal products is not a reliable purchasing assumption.

• Section 301: Check the specific product and origin against the applicable action and any exclusion. USTR’s product search identifies covered HTS subheadings and additional duties; exclusions require a separate check.
• Section 232: Steel, aluminum, vehicles, and parts may be subject to distinct measures. Require suppliers to document the applicable product coverage, valuation basis, origin treatment, and entry date instead of extrapolating from an old metals rate.
• USMCA: Preferential treatment depends on the applicable rules and supporting documentation. North American sourcing or U.S. final assembly alone should not be treated as proof that every imported vehicle or component avoids additional duties.
• Antidumping and countervailing duties: Review the precise scope and supplier-specific treatment of an order when assessing tires, metal products, or other affected imports.
• Other measures: Check current HTS Chapter 99 provisions and CBP instructions for additional applicable duties and exceptions. Do not assume that one trade measure replaces all others.

The procurement question is straightforward: what duty exposure applies to this specific purchase, who bears it under the contract, and what documentation supports the surcharge?

Where Tariffs Hit Fleet Operations

Tariffs can reach every stage of the asset life cycle. Fleet leaders should examine the purchase price alongside maintenance, downtime, and infrastructure costs.

• Vehicles and upfits: Ask for a clear distinction between base vehicle cost, imported components, upfit materials, and separately identified surcharges.
• Batteries: Separate cell, module, and replacement-pack assumptions. As an illustrative scenario, a $40,000 customs value subject to an additional 25% duty produces $10,000 in duty before other costs. Across 50 equivalent purchases, that is $500,000. The 25% rate is an assumption for this example; the actual rate and supplier pass-through must be verified for the purchase.
• Parts and electronics: Track repair-critical tires, brakes, sensors, control modules, and telematics equipment. A relatively small component can create a much larger downtime cost if it becomes unavailable.
• Depot infrastructure: Review chargers, switchgear, steel structures, installation costs, and utility work separately. An equipment quote is not the full cost of an operating charging facility.

Public vs. Private Fleet Impacts

Tariffs influence fleets in ways that are often invisible at first but unmistakable once budgets tighten.

• Public fleets often work within fixed appropriations and procurement rules. When bids exceed the approved budget, leaders may need additional funding, revised specifications, fewer purchases, or a different replacement schedule. The political visibility of missed replacements is high, especially for garbage trucks, buses, and police vehicles — yet the tariff layer behind those overruns often goes unmentioned.
• Private fleets work within different ownership, financing, and customer-service requirements. Finance and operations leaders may adjust replacement timing, split orders, or consider alternative suppliers. The right choice depends on utilization, service commitments, and the cost of keeping existing vehicles in operation.
• Across both sectors, shared challenges include budget shocks that originate far upstream, lead-time uncertainty when manufacturers reprice or delay deliveries, reliability risks from extended asset life cycles, and pressure to adopt new procurement models like cooperative purchasing, supplier diversification, or index-based contracts that adjust automatically for tariff swings.

Measuring Tariff Risk

Fleet leaders should treat tariff exposure as a trackable and recurring cost variable within Total Cost of Ownership (TCO) models — not a one-time anomaly.

• Stress-test cost exposure in TCO models using the verified rate for the specific purchase, then model alternative supplier pass-through, delivery, and replacement scenarios. Label every assumed percentage with its source and review date.
• Monitor timing closely. Tariffs can take effect within weeks. Two fleets ordering the same model in different months may face very different costs. Monitoring the Federal Register and U.S. Trade Representative notices helps anticipate shifts before they reach purchase orders.
• Maintain a tariff risk register. Catalog key parts, note HS codes, assign exposure levels, and update quarterly. Even a simple spreadsheet can highlight patterns and help procurement teams plan around them.
• Communicate visually. Use “tariff exposure per vehicle” charts for boards, councils, or CFOs. Clear visuals show proactive management of a cost driver most stakeholders rarely see.

A useful tariff-risk register records the part or vehicle, supplier, country of origin, HTS classification, verified duty assumptions, quote expiration, contract responsibility, and next review date.

Mitigation Strategies for Fleet Leaders

Tariff exposure is not a one-off surcharge — it is a recurring, often overlooked input to fleet costs. Mitigation should make that exposure visible, measurable, and contractually managed.

• Negotiate tariff clauses with OEMs and suppliers — require documentation, cap pass-through costs, and set price-change thresholds tied to objective triggers.
• Consider staged orders to spread timing risk, while weighing the possibility of higher later prices, longer lead times, and lost volume discounts.
• Diversify suppliers and product categories so fleets are not dependent on a single source.
• Evaluate Foreign-Trade Zones, bonded warehousing, and duty drawback with a qualified customs adviser where the supply chain supports them. These tools have different eligibility, status, and documentation requirements; they are not automatic tariff exemptions or guaranteed refunds.

Federal Incentives: Plan From the Correct Deadlines

Vehicle and charging-property credits had different termination rules. Under Public Law 119-21 and current IRS guidance:

• Section 45W, commercial clean vehicles: Vehicles acquired after September 30, 2025 do not qualify.
• Section 30D, new clean vehicles: The same acquisition cutoff applies. This is separate from the commercial vehicle credit.
• Section 30C, refueling and charging property: The credit is unavailable for property placed in service after June 30, 2026. Its cutoff concerns when equipment enters service, not merely when it is ordered.

IRS guidance defines vehicle acquisition for these purposes by a written binding contract and a payment. A qualifying acquisition by the deadline may support a later placed-in-service claim, subject to the other requirements. Fleets with earlier transactions should retain contracts, payment evidence, delivery records, and applicable tax documentation.

For new procurement decisions in October 2026, do not budget these expired incentives as available offsets. Evaluate any state, local, or utility support separately and confirm its current eligibility and funding before including it in an approved business case.

Procurement Priorities After the Federal Credit Cutoffs

The central decision is whether a vehicle or infrastructure investment meets operational needs under the costs and incentives actually available to that project.

• Rebuild the base case without expired federal incentives. Treat unconfirmed grants or rebates as a separate scenario.
• Compare acquisition cost with fuel or electricity, maintenance, utilization, downtime, financing, infrastructure, and residual value.
• For electric fleets, verify utility capacity, connection timelines, demand charges, and the charging schedule before committing to the vehicle order.
• Review supplier surcharge clauses at bid, award, and delivery. Require a process for both increases and reductions when assumptions change.
• Update the tariff-risk register when material policy changes occur, rather than waiting for the next quarterly review.

Protect the Budget and the Service It Supports

Fleets do not set trade policy, but they can control how well purchasing decisions account for it. Documented costs, clear contract terms, and realistic delivery assumptions give leaders a stronger basis for deciding when to buy, what to replace, and where to retain flexibility.

The objective is to keep vehicles available, replacement schedules credible, and service commitments within reach. Treating tariff exposure with the same discipline as fuel, labor, and maintenance makes it easier to protect all three.

Sources and Update Note

USITC: Understanding the Harmonized Tariff Schedule · International Trade Administration: Rules of origin

This October 17, 2026 revision corrects the Section 30C deadline, removes expired incentive calls to action and unsupported fleet anecdotes, labels cost examples as illustrative, and replaces blanket tariff-rate assumptions with purchase-specific verification.

• IRS: Form 8936 instructions and clean-vehicle acquisition rules
• IRS: Form 8911 instructions for refueling-property credit
• USTR: Section 301 actions and exclusions
• CBP: Section 301 and FTZ guidance (June 28, 2018 bulletin)

Read the original on LinkedIn ↗

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