Tariffs Are Now a Diligence Item

Tariff exposure is now a first-order operational due diligence item in lower middle market M&A. For any goods-producing business with imported inputs, offshore suppliers, or customer contracts that limit price increases, the tariff question is not macroeconomic commentary. It is a direct EBITDA question.

That is the shift too many buyers are still underwriting around. The lower middle market goods sector entered 2026 in a structurally different cost environment from the one reflected in many trailing financial statements. Input costs for businesses with meaningful imported components, raw materials, or finished goods are no longer stable planning variables. They are policy-dependent variables. A business whose 2024 COGS included substantial offshore inputs may now be operating with a cost structure that can move materially based on a trade policy announcement, a classification decision, or a supplier's country-of-origin exposure.

Yet many buyers are still leaning on LTM financials as though they describe the business being acquired today. They do not. For an import-exposed manufacturer, distributor, specialty products business, or contract manufacturer, historical EBITDA may describe a tariff regime that no longer exists.

Why LTM EBITDA Can Miss Import Cost Risk

Traditional financial due diligence in lower middle market acquisitions is built to answer familiar questions: is revenue recurring, are margins sustainable, are add-backs real, is customer concentration manageable, and what normalized EBITDA should a buyer underwrite?

Those are necessary questions. They are not sufficient anymore.

The missing workstream is input cost exposure. Where do direct materials come from? What percentage of COGS is import-dependent? Which products are tied to tariff-affected countries or categories? Does the business have pricing power, or does it operate under fixed-price contracts that turn cost increases into margin compression? How long would it take to shift supply to a domestic or North American alternative? What would that do to lead time, quality, working capital, and customer service?

Those questions used to live inside operations and procurement. In the current environment, they belong inside the investment memo.

The diligence failure is structural. Buyers tend to treat tariff exposure as an external risk, then underwrite the business as if the operating team will figure it out after close. But tariff exposure does not wait for post-close optimization. It changes the quality of earnings before the deal closes.

The Questions Standard Diligence Still Does Not Ask

Tariff exposure should be treated as a separate operational due diligence workstream, distinct from standard financial diligence and distinct from generic supply chain review. The questions are not complicated, but they are specific.

What percentage of direct materials cost is sourced from tariff-affected countries?

Which SKUs, suppliers, or product categories carry the exposure?

Does the business operate under fixed-price contracts with customers, and how long until those contracts can be repriced?

What evidence exists that the business has passed through specific input cost increases before?

Is the company diversified across suppliers, geographies, and freight lanes, or is it dependent on a small number of offshore vendors with long lead times?

Are domestic or North American backup suppliers already qualified, or are they only theoretical?

The difference between these answers is material. A business with moderate import exposure, documented pricing power, and qualified backup suppliers has options. A business with heavy offshore input dependence, fixed-price customer contracts, and no alternative sourcing path has a structural problem. Leverage will not make that problem smaller.

How to Underwrite Tariff Sensitivity Without Pretending to Predict Policy

The answer is not to model a single tariff outcome with false precision. The range of possible rates, exemptions, product classifications, enforcement changes, and retaliation scenarios is too wide for point estimates to carry much meaning.

The answer is to underwrite sensitivity and response capacity.

Tariff sensitivity means the degree to which a business's EBITDA, working capital, and customer economics change when input costs move because of tariff policy. Response capacity means the business's ability to protect margin through pricing, sourcing, contract structure, inventory planning, and supplier diversification.

Those are diligenceable.

You can map import dependency by country and supplier. You can review customer contracts for pass-through rights. You can inspect historical price increases and separate true pass-through from ordinary inflationary pricing. You can test whether domestic supplier alternatives are real by reviewing quotes, capacity, qualification status, and lead times. You can stress-test working capital if inventory needs to be purchased earlier, rerouted, or duplicated during a supplier transition.

The output of tariff diligence should not be a forecast of trade policy. It should be a deal decision. Some exposure belongs in valuation. Some belongs in debt capacity. Some belongs in the working capital target. Some may belong in specific seller representations if supplier, classification, customer contract, or pass-through facts were incomplete. And some belongs in the first hundred-day plan because the buyer will own the response after close.

In a goods-producing lower middle market business, tariffs are no longer separate from working capital traps. Input cost structure has become a working capital variable.

The Better Diligence Question

The question is not, "What will tariff policy be next year?"

The better question is, "If tariff policy moves against this business, how fast can the company respond without destroying margin, service levels, or cash flow?"

That question belongs before LOI, not after close. It should affect valuation, debt capacity, seller structure, working capital targets, and the first hundred-day plan. If the buyer cannot answer it, the EBITDA they are underwriting is incomplete.

KEY FRAMEWORK - OPERATIONAL DUE DILIGENCE

The Tariff Exposure Assessment

A structured diligence workstream to evaluate input cost risk in lower middle market goods-sector acquisitions.

• Import dependency mapping: Quantify what percentage of COGS flows through tariff-affected supply chains, broken down by country of origin, supplier, and product category.

• Contract pass-through review: Identify fixed-price contracts, pass-through rights, repricing windows, and customer concentration inside tariff-exposed products.

• Pricing power evidence: Review specific historical input cost events and determine whether the business passed those costs through, absorbed them, or lost volume.

• Supplier optionality: Confirm whether alternate suppliers exist, whether they are qualified, and how quickly the business could activate them without disrupting customer delivery.

• Working capital impact: Stress-test what happens if the company needs to buy inventory earlier, carry duplicate suppliers, or absorb longer lead times during a sourcing transition.

• The core principle: Tariff exposure is now a first-order operational due diligence item in lower middle market acquisitions involving physical goods. Underwriting EBITDA without understanding input cost sensitivity is no longer conservative. It is incomplete.

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