U.S. sales + Mexico manufacturing: how should intercompany pricing, customs and group finance connect?

When an Asian group combines a U.S. sales company with a Mexico manufacturing operation, the structure can look simple on an organization chart: Mexico makes the product, the U.S. company sells it, and headquarters owns both.

In practice, that model creates one of the most demanding coordination problems in North American expansion. The same product can appear simultaneously as Mexico inventory, an intercompany sale, a U.S. customs import, U.S. inventory, a related-party transaction, a receivable in one entity, a payable in another and, eventually, revenue to an unrelated customer.

ASCG Pacific's Asia—U.S.—Mexico Cross-Border Coordination service is built around this operating reality. The objective is not merely to make each entity compliant in isolation. It is to make the commercial flow, legal agreements, transfer pricing, customs value, accounting records and headquarters reporting describe the same business model.

Core principle: a U.S. sales entity and a Mexico manufacturing entity should not develop separate explanations of the same transaction. The group should define the operating model first, then make tax, customs, accounting and reporting follow it consistently.

Start with functions and risks before choosing the intercompany price

Many groups begin with a pricing question: “What markup should Mexico charge the U.S. company?” That is usually too early.

Before pricing, management needs to decide what each entity actually does and what risks it controls.

For the Mexico manufacturing entity, the factual profile may include some combination of:

• purchasing raw materials or receiving materials supplied by another group company;
• operating the plant and production workforce;
• maintaining machinery, tooling and manufacturing systems;
• holding work-in-process and finished goods;
• controlling scrap, yield, quality and production scheduling;
• managing local suppliers and logistics providers;
• temporarily importing inputs under IMMEX where applicable; and
• assuming some or limited manufacturing, inventory, warranty or market risks depending on the model.

For the U.S. sales entity, the profile may include:

• contracting with U.S. customers;
• setting or negotiating customer prices;
• forecasting demand;
• importing goods into the United States;
• owning U.S. inventory;
• managing warehouses or fulfillment;
• extending customer credit and collecting receivables;
• handling warranty, returns and commercial support; and
• employing the sales, operations or management personnel who make key market decisions.

Headquarters then needs to identify which decisions remain in Asia: product strategy, intellectual property, procurement leverage, capital allocation, group financing, senior management or major customer policy.

Those facts matter because transfer pricing is not supposed to begin with a desired tax result. Both U.S. and Mexican rules focus on how related parties would price transactions under arm's-length conditions, and that analysis depends heavily on functions performed, assets used, contractual terms and risks assumed.

Define the product flow before defining the accounting flow

A cross-border structure becomes difficult when legal invoices do not match the physical movement of goods.

Management should be able to draw one clear product-flow diagram showing:

1. where raw materials originate;
2. which entity purchases or owns them;
3. where title and risk of loss change;
4. which entity controls production;
5. when finished goods are sold by Mexico to the U.S. entity, if there is an intercompany sale;
6. which party acts as importer of record into the United States;
7. where inventory sits before the customer sale; and
8. which entity invoices and collects from the final customer.

That diagram should then be reconciled with purchase orders, commercial invoices, Incoterms, customs entries, warehouse records, ERP movements and the intercompany agreement.

If the legal agreement says the U.S. entity buys finished goods when they leave the Mexico plant, but the ERP records the transfer only when the goods arrive at a U.S. warehouse, the group may create differences in inventory in transit, accounts payable, revenue recognition, foreign exchange and customs documentation.

The issue is not that one specific Incoterm or title-transfer point is universally correct. The issue is that the chosen commercial terms must be deliberate and reflected consistently across systems.

Transfer pricing should describe the operating model, not repair it after year-end

In the United States, IRC §482 allows the IRS to adjust income among commonly controlled taxpayers when necessary to reflect arm's-length results. Mexico likewise requires related-party transactions to use prices, consideration amounts or profit margins consistent with comparable independent transactions, with documentation supporting the functions, assets, risks, transaction amounts and method applied.

For a U.S.-sales/Mexico-manufacturing model, common controlled transactions can include more than the finished-goods invoice:

• finished goods sold from Mexico to the U.S.;
• components or tooling supplied in the opposite direction;
• management or administrative services;
• engineering and technical support;
• royalties or other intangible-related payments;
• intercompany loans and interest;
• shared software or IT charges;
• warranty reimbursements;
• freight, insurance or logistics recharges; and
• headquarters allocations.

Each category should have a business rationale, agreement, pricing logic and accounting treatment.

A markup is not a transfer-pricing policy by itself

A statement such as “Mexico is cost plus 5%” is incomplete unless the group can answer:

• Which costs are included in the base?
• Are materials included or excluded?
• How are depreciation, scrap, idle capacity and extraordinary costs treated?
• Who bears freight, duties and warehousing?
• What happens if actual profitability deviates from the target?
• Is there a year-end true-up?
• How does that true-up affect customs values and inventory?
• Is the method appropriate given the actual functions and risks?

Mexico's transfer-pricing rules provide several methods and generally require taxpayers to determine which method is appropriate under the applicable facts. A cost-plus or transactional-net-margin approach may be relevant in some manufacturing structures, but it should not be selected simply because it is easy to calculate.

The operating model should therefore produce data that allows the transfer-pricing method to be applied throughout the year, not reconstructed once the annual study begins.

Tax transfer pricing and customs valuation are connected — but they are not the same test

This distinction is critical when the U.S. entity imports goods from a related Mexico manufacturer.

For U.S. income tax, the group may support its intercompany price under §482 and an arm's-length transfer-pricing method. For U.S. customs, however, CBP applies customs valuation rules to the imported merchandise.

When buyer and seller are related, the relationship does not automatically disqualify transaction value. But the importer may need to demonstrate, under the applicable customs rules, that the relationship did not influence the price or that another accepted test is satisfied.

That means a transfer-pricing study prepared for income-tax purposes should not automatically be treated as proof that the same number is acceptable for customs valuation.

Year-end transfer-pricing adjustments can create a customs problem if they were not designed in advance

Suppose the group invoices finished goods throughout the year using a provisional intercompany price. At year-end, the transfer-pricing analysis shows that Mexico earned more or less than the target result, so the group issues a debit or credit adjustment.

From a tax perspective, that may be part of the group's transfer-pricing process. From a customs perspective, the group still needs to determine how the adjustment affects previously imported merchandise, whether the pricing formula was sufficiently objective and established, and whether any customs reporting or reconciliation mechanism applies.

The practical lesson is simple: do not design the tax true-up first and ask customs about it later.

Tax, customs, accounting and the broker/import team should understand the adjustment mechanism before the first year-end true-up is posted.

Mexico manufacturing compliance must connect to the intercompany model

If the Mexico manufacturer operates under IMMEX, the intercompany pricing model cannot be separated from inventory and customs control.

Temporary imports, BOM consumption, finished-goods exports, inventory discharges, Anexo 24 controls and, where applicable, the SCCCyG framework all depend on traceable operating data. A transfer-pricing true-up does not change physical quantities, but it can affect inventory values, cost of goods sold, margins and intercompany balances.

That is why the Mexico controller should be able to reconcile at least three dimensions each month:

1. quantity: what entered, what was consumed, what was produced and what left;
2. value: how those movements were valued in statutory books, ERP and intercompany invoices; and
3. profitability: whether the entity's actual results remain consistent with the transfer-pricing policy and business facts.

For a deeper discussion of this operating layer, see our insight on IMMEX, inventory control and headquarters reporting for a Mexico plant.

The U.S. entity has its own related-party reporting and recordkeeping layer

A foreign-owned U.S. corporation may have Form 5472 obligations when it enters into reportable transactions with foreign related parties. Those reportable flows can include purchases and sales of inventory, services, interest, royalties and other categories.

This is why the U.S. ledger should not contain one generic account called “intercompany.” The accounting system should allow the finance team to identify at least:

• counterparty;
• transaction type;
• currency;
• invoice date;
• settlement date;
• related agreement;
• product or service category; and
• any year-end adjustment associated with the transaction.

Our separate Form 5472 guide for foreign-owned U.S. companies explains that reporting layer in more detail.

Mexico also requires the related-party story to be visible in accounting and documentation

Mexico's corporate income-tax rules require qualifying related-party documentation to identify the related parties, ownership relationship, functions, assets, risks, transaction amounts, comparability information and transfer-pricing method. The law also requires related-party operations to be identified in accounting.

In addition, Mexican companies can have annual related-party information filings. The ordinary related-party information requirement under Article 76 includes a filing deadline of May 15 of the following year, while the separate master/local/country-by-country framework under Article 76-A applies only to taxpayers that fall within its specific scope and generally uses a later annual filing window.

The management implication is important: not every Mexico subsidiary has the same information-return package, but every group with material related-party activity should know which obligations apply before the annual close, not when the filing deadline arrives.

Monthly close is where the operating model proves whether it works

A structure may look coherent in legal documents and still fail every month in accounting.

For a U.S.-sales/Mexico-manufacturing model, the close should include a repeatable intercompany package.

1. Intercompany AR/AP reconciliation

The U.S. payable to Mexico should reconcile to Mexico's receivable after accounting for:

• invoices not yet posted by the counterparty;
• credit notes;
• payments in transit;
• FX differences;
• goods in transit; and
• year-end or periodic transfer-pricing adjustments.

A difference should have an owner and an explanation, not simply remain in a suspense spreadsheet.

2. Inventory-in-transit reconciliation

Finance should know which goods have left Mexico but have not yet been received into U.S. inventory, and which entity owns those goods under the agreed commercial terms.

3. Gross-margin bridge

The U.S. finance team should explain changes in gross margin by separating at least:

• customer price;
• intercompany purchase price;
• freight and logistics;
• duty and customs costs;
• warehousing;
• rebates and returns; and
• FX effects.

4. Mexico manufacturing-margin bridge

Mexico should likewise be able to explain whether manufacturing profitability moved because of volume, labor, material cost, scrap, capacity utilization, transfer-pricing adjustments or exceptional items.

5. Group eliminations

Headquarters should eliminate intercompany sales, purchases, receivables and payables consistently. If one entity records a service fee and the other records a product cost, consolidation becomes an accounting investigation rather than a routine close.

A useful test: if headquarters cannot explain the U.S. margin and the Mexico margin using the same transaction data, the intercompany model is not yet under control.

Four common operating models — and why they produce different control requirements

There is no single correct U.S.-Mexico structure. The correct model depends on commercial facts, investment, personnel, customs, tax, customer requirements and risk allocation.

Scenario 1: Mexico manufactures and sells finished goods to a U.S. distributor

The U.S. entity purchases inventory, imports it and resells to U.S. customers.

Key questions include the intercompany product price, U.S. customs valuation, inventory ownership, U.S. distribution margin, Mexico manufacturing return and Form 5472 reporting.

Scenario 2: Mexico operates as a limited-risk or contract manufacturing entity

The group may seek a more limited functional and risk profile for Mexico. But the contracts and actual conduct must support that characterization. If Mexico in practice controls strategic procurement, bears major inventory risk or makes key commercial decisions, the label “limited risk” by itself does not determine the transfer-pricing result.

Scenario 3: The U.S. entity owns materials or tooling used in Mexico

This model can create additional questions around customs, assists, fixed assets, import/export treatment, inventory records, depreciation and intercompany charges. The group needs clear asset ownership and movement records.

Scenario 4: Headquarters provides services or financing to both entities

Now the North American model has more than one bilateral relationship. The group may need U.S.-Asia, Mexico-Asia and U.S.-Mexico agreements, with consistent allocation keys and settlement processes.

The more entities involved, the more important a counterparty-based intercompany ledger becomes.

USMCA origin should be evaluated separately from transfer pricing and entity location

Manufacturing in Mexico does not automatically make a product USMCA-originating.

If the group wants preferential tariff treatment when goods enter the United States, the product must satisfy the applicable rules of origin and the claim must be supported by the required origin information. Asian inputs can therefore matter even when substantial manufacturing occurs in Mexico.

This is especially relevant in 2026 because the U.S. and Mexico have been actively discussing rules of origin and economic-security issues during the USMCA joint-review process. Those negotiations make origin-data quality strategically important, but management should distinguish current binding requirements from proposals or future changes that have not yet taken effect.

The BOM used by the plant, the customs-origin analysis and the financial product-cost model should therefore be reconcilable, even though each serves a different purpose.

What should Asia headquarters receive every month?

For a group operating U.S. sales and Mexico manufacturing, a useful headquarters package should go beyond two separate trial balances.

At minimum, management should be able to see:

1. U.S. external sales and gross margin;
2. Mexico production volume and manufacturing margin;
3. intercompany product sales by counterparty;
4. intercompany services, royalties, interest and other charges;
5. U.S.-Mexico AR/AP reconciliation;
6. inventory in Mexico, in transit and in the United States;
7. customs and duty exceptions;
8. transfer-pricing actual-versus-policy results;
9. FX exposure and realized/unrealized differences;
10. material tax or filing items in each jurisdiction; and
11. unresolved differences that could affect customs, tax or statutory reporting.

This turns the group from “three accounting teams sending numbers” into one management system.

A 12-point readiness check for U.S. sales + Mexico manufacturing

Before the model scales, headquarters should be able to answer yes to these questions:

1. Do we have a written diagram of the physical product flow?
2. Is ownership/title transfer defined at each material step?
3. Is the importer of record into the United States clearly identified?
4. Do intercompany agreements match actual conduct?
5. Have functions, assets and risks been documented for U.S., Mexico and headquarters?
6. Is the transfer-pricing method supported by those facts rather than by a target tax result?
7. Can tax and customs teams explain how the intercompany product price is used for U.S. import valuation?
8. Is any year-end true-up mechanism defined before the adjustment occurs?
9. Can Mexico reconcile inventory quantities, customs balances and financial values?
10. Can the U.S. books identify reportable related-party transactions by counterparty and type?
11. Does headquarters receive one reconciled U.S.-Mexico intercompany package every month?
12. Are USMCA origin, tax transfer pricing and customs valuation treated as three connected but distinct analyses?

If several answers are “no,” the problem is not merely tax compliance. The group is operating without a complete North American transaction architecture.

The goal is not to maximize profit in one entity — it is to make the entire model defensible and manageable

A well-designed U.S.-sales/Mexico-manufacturing structure should allow management to answer four questions at the same time:

• Commercial: which entity earns revenue from the customer and why?
• Operational: which entity performs which functions and bears which risks?
• Tax and customs: why are related-party prices and import values supportable under the applicable rules?
• Financial: can headquarters reconcile the margins, balances, inventory and cash flows every month?

When those answers are designed together, compliance becomes a by-product of a controlled operating model rather than a year-end reconstruction exercise.

For Asian groups already operating — or preparing to operate — across both countries, ASCG Pacific can coordinate the U.S., Mexico and headquarters workstreams through our Asia—U.S.—Mexico Cross-Border Coordination service.

This article provides general information only and is not tax, legal or accounting advice for any specific facts or circumstances.