This post uses hypothetical scenarios for illustrative purposes only. It does not describe any actual client, transaction, or representation, and is not legal advice.
Download: Tariff Diligence Checklist — FMA-016 (.docx) — a companion template for this post. Adapt with counsel before use.
A common 2026 cross-border M&A pattern looks like this. Buyer signs an LOI on a mid-market consumer-products target with a tidy EBITDA, a landed-cost model built in 2022, and a supply chain that leans heavily on three or four Asian suppliers. By the time quality-of-earnings closes, the finance diligence team has flagged four tariff reclassifications, a First Sale pricing structure that will not survive a CBP look-back, and an open prior-disclosure that the target’s general counsel described as “routine.” The deal does not die, but the purchase price drops seven figures, the indemnity architecture rewrites itself, and the rep & warranty insurance underwriter walks away from everything with the word “customs” in it.
Three years ago, a cross-border M&A deal cared about country-of-origin reps mostly to the extent that products were already sitting in a bonded warehouse. In 2026, the country-of-origin rep is a standalone diligence module. Reciprocal tariffs — layered under the IEEPA authorities at 50 U.S.C. §§ 1701-1707, Section 232 under 19 U.S.C. § 1862, and the Section 301 regime at 19 U.S.C. § 2411 — have moved the duty rate on a given SKU from “look it up in the HTS” to “depends on the current political cycle.” That is the diligence shift buyers who closed in 2022 did not run, and the one no buyer in 2026 can skip.
The 2026 Tariff Environment, Briefly
The 2026 trade posture is defined less by any single rate and more by the layering of authorities. IEEPA, which Congress passed in 1977 as an emergency statute, now underwrites a cycle of reciprocal duties that respond to foreign measures on a rolling basis. Section 232 national-security actions on steel, aluminum, and derivative products continue to compound. Section 301 investigations and tariff adjustments have moved beyond China to a handful of other jurisdictions. Court challenges to each authority remain live — the Court of International Trade and the Federal Circuit are the venues to watch — but a buyer sitting at an LOI table today has to assume the current rates are the rates, with volatility layered on top.
The structural consequence for M&A is that the landed-cost model in the target’s financials is only as reliable as the HTS classifications, country-of-origin claims, and First Sale documentation behind it. A target that has not refreshed those files since 2022 is working from a tariff environment that no longer exists.
The Country-of-Origin Rep as a New SPA Module
Three years ago, country-of-origin language lived in supply agreements. In 2026, it belongs in the stock purchase agreement — typically a three-pronged rep. First, that no products sold or imported by the target originate from any country subject to additional-duty treatment under IEEPA, Section 232, or Section 301, except as scheduled. Second, that all HTS classifications used by the target are accurate and supported by documented classification work (binding rulings, classification memoranda, or outside-counsel opinions). Third, that any First Sale pricing claims used to reduce the dutiable value under 19 C.F.R. § 152.103 are supported by invoice-level documentation of a bona fide sale for export to the United States, with the manufacturer’s margin substantiated.
Each of those prongs comes with its own disclosure schedule and its own diligence workpaper. Buyers who put the country-of-origin rep into a single generic sentence lose their recovery vector when the exposure shows up post-close.
Transfer Pricing as a Tariff Vector
Related-party cross-border transfer pricing used to be a tax-diligence item. In 2026 it is also a customs-diligence item. The CBP First Sale rule, IRC § 482 transfer-pricing substantiation, and IRC § 1059A’s related-party inventory limitation now intersect in ways that matter at close. A target that moves goods through an affiliated foreign manufacturer and claims First Sale pricing without a current § 482 study is running an open customs-tax exposure that is one audit letter away from a reassessment. The diligence question is whether the § 482 documentation, the intercompany agreements, and the CBP valuation disclosures tell the same story. When they do not, the delta is the exposure.
The BOM-Level Country-of-Origin Audit
Serious buy-side diligence in 2026 includes a bill-of-materials audit on the target’s top twenty input components — the inputs that drive the majority of landed cost. For each, the diligence team pulls the current country of origin, the HTS classification used at import, the FTA preference claim (if any), and the current reciprocal-tariff exposure. A target that cannot produce that map inside the data room has not run the audit itself, which usually means it has not reclassified anything since the current tariff regime took hold. A buyer who closes without running the map inherits the gap.
This is not a boutique exercise. Consumer-products, industrial-components, electronics, apparel, and even food-and-beverage targets — anything with a non-trivial import footprint — needs the audit. The exercise lives in the same workstream as a quality-of-earnings pull, and often ends up driving a quality-of-earnings reprice at the LOI-to-purchase-agreement step.
FCPA and Sanctions Overlay
Reciprocal tariffs have raised the incentive for importers to misroute goods through third-country trans-shipment, mis-mark country of origin, or misclassify under a lower-duty HTS code. Each of those is a customs violation on its own; several of them also create FCPA exposure (if a foreign customs broker is paid to look the other way) or sanctions exposure (if the transshipment point implicates OFAC-restricted jurisdictions). A diligence team that has run the country-of-origin audit but not the sanctions and FCPA overlay has done half the work. The right posture is a joint review of CBP filings, OFAC screening logs, and payment histories to foreign brokers and freight forwarders.
Download: Tariff Diligence Checklist — FMA-016 (.docx) — a companion template for this post. Adapt with counsel before use.
Indemnification Architecture
Standard-form indemnities do not catch tariff exposure well. The right 2026 structure splits pre-closing customs liability out of the general indemnity bucket into a specified indemnity, uncapped by the general cap, surviving six years to match the CBP statute of limitations at 19 U.S.C. § 1621. A specified escrow or holdback — typically two to five percent of purchase price — carries the exposure through the first full look-back audit cycle. Where the target has an open CBP binding ruling that materially drives valuation, a separate carve-out holdback tied to the ruling’s survival makes sense.
Buyers who leave tariff exposure inside the general indemnity cap discover at the first demand letter that the cap is exhausted before the customs liability lands. This is the architecture the four-cap indemnity structure was built for; tariff exposure is now the paradigm specified-indemnity bucket.
Rep & Warranty Insurance Posture
RWI underwriters have aggressively tightened their customs and tariff posture in 2026 policies. Many 2026-vintage quote forms carry a customs-and-tariff exclusion that reaches both pre-closing customs liability and any post-closing reclassification exposure. The negotiation posture matters. A blanket “customs and tariff” exclusion should become a tailored exclusion limited to matters disclosed in diligence, with everything else covered under the policy. When the broader exclusion is non-negotiable, the specified indemnity above becomes the sole recovery vehicle, and the dollar size of that escrow needs to reflect the shift.
The parallel exercise shows up in other 2026 diligence modules where RWI underwriters have carved out emerging risk categories; tariff follows that same pattern.
Deal-Killer Scenarios
Discovered tariff exposure is not always a price adjustment. There is a scenario arc where the exposure is a walk-away. In a representative pattern, a buyer discovers that the target’s entire landed-cost model assumes a First Sale claim the invoice chain cannot support, that the target has been using a lower-duty HTS code without a binding ruling, and that an open prior disclosure is being treated internally as closed. Each exposure on its own might be a price adjustment; together they imply that the diligence team cannot bound the pre-closing liability. That is a walk-away, and the LOI should have a clean termination mechanism for it — not a reverse-break fee, but a diligence-contingency termination that releases both sides. Buyers who did not negotiate that termination at the LOI step find themselves renegotiating on the back foot.
The right LOI drafting posture is a diligence contingency specifically keyed to customs, tariff, and trade-controls matters, with a cash-free, debt-free, and tariff-exposure-free closing condition that forces the finding into the open before signing. A full M&A diligence checklist is the normal starting point; tariff diligence is now the module most buyers underweight.
What the Diligence File Should Look Like at Closing
By closing, the diligence file should contain the twenty-item BOM country-of-origin audit; HTS classification memoranda or binding rulings for every material SKU; First Sale documentation for any value-reduction claim; a current § 482 transfer-pricing study with intercompany-agreement cross-references; CBP binding-ruling pulls from the CROSS database; prior-disclosure files; AD/CVD scope-ruling pulls on any product category under order; FTA preference-claim substantiation (USMCA, CAFTA-DR, KORUS); OFAC and BIS screening logs; UFLPA supply-chain mapping under 19 U.S.C. § 1307; and a tariff-reclassification risk scoring on the top SKUs by revenue. The companion checklist above is the version of that file we hand to clients to populate.
The posture to carry into the 2026 LOI is simple. Country of origin is now a rep, not a schedule. Tariff exposure is a specified indemnity, not a general bucket. RWI will push back on customs; the counter-move is a tailored exclusion. And the diligence file either tells the full story at closing or the deal reprices — sometimes to zero.
If you are evaluating a cross-border or import-heavy target in the 2026 tariff environment, feel free to reach out to our firm manager, Magda, at Magda@montague.law, or fill out our contact form. Mention you read this post.
