When a Canadian target owns foreign subsidiaries, its tax profile depends on more than its own returns. Canada's foreign affiliate rules, the tax systems of each foreign jurisdiction and the intercompany arrangements connecting them all shape what the purchaser is acquiring. Exposure in these structures is often technical, spread across several years and invisible in the financial statements. Diligence scoped for it early gives the deal team time to price and allocate the risk.

Start With the Structure Chart

The first task is an accurate map of the group, with each entity classified for Canadian tax purposes. Classification does not always follow foreign legal form. U.S. limited liability companies, for example, are generally treated as corporations in Canada even where they are disregarded for U.S. purposes. Partnerships, trusts and dormant entities belong on the map as well.

Residence also needs to be tested. A foreign subsidiary whose central management and control is in practice exercised from Canada may be resident in Canada, with consequences in both countries.

Foreign Accrual Property Income

Canadian shareholders of controlled foreign affiliates are taxed currently on certain passive and Canada-connected income of those affiliates, whether or not it is distributed. Diligence should confirm that the target has identified this income correctly, including:

  • interest, rents, royalties and portfolio investment income earned offshore;
  • income from services, sales or financing connected to Canada, which specific rules can treat as passive; and
  • gains on the sale of property not used in an active business.

Where the target is a Canadian-controlled private corporation, or is treated as one for these purposes, rules enacted in March 2026, which apply to taxation years beginning after April 6, 2022, changed how this income is taxed. Past filings should be reviewed against those rules.

Surplus Accounts and Tax Attributes

The tax cost of bringing foreign profits back to Canada depends on surplus accounts that track the character of an affiliate's earnings and the foreign tax paid on them. These balances, together with the tax cost of affiliate shares and available losses, are frequently assumed rather than verified. Unsupported balances can change the economics of post-closing dividends and reorganizations.

The same attributes matter to acquisition planning. In certain circumstances, Canadian rules allow a purchaser, after acquiring control and amalgamating with or winding up the target, to increase the tax cost of certain non-depreciable capital property, including shares of foreign affiliates. Access to this step-up is subject to restrictive conditions that should be tested before signing.

An acquisition of control also triggers a deemed year-end for the target and restricts the future use of certain Canadian tax losses.

Intercompany Arrangements and Financing

Transfer pricing typically involves significant judgment. Management fees, royalties, cost-sharing arrangements and intercompany loans should be supported by agreements and documentation consistent with the functions actually performed. Canada's transfer pricing rules were substantially revised by legislation enacted in 2026, with more demanding documentation expectations and a shorter period to produce documentation when the CRA requests it.

Financing between the target and its affiliates deserves separate review. A loan from a foreign affiliate to its Canadian parent can create an income inclusion if it is not repaid within a set period. Where the purchaser is foreign, Canada's foreign affiliate dumping rules can apply to investments that the target, or a Canadian acquisition vehicle, makes in foreign affiliates, with potential deemed dividends subject to withholding tax. Interest deductibility, thin capitalization and hybrid mismatch rules complete the analysis.

Compliance and Reporting

Compliance gaps can be significant even where the underlying tax is modest. Points to confirm include:

  • T1134 foreign affiliate returns for each affiliate and each year, and their consistency with the underlying calculations;
  • T106 reporting of transactions with non-arm's-length non-residents;
  • withholding on dividends, interest, royalties and fees paid to non-residents, including fees for services rendered in Canada;
  • disclosure of any reportable or notifiable transactions; and
  • the foreign affiliates' own local filings.

Late or missing information returns can attract penalties and extend the period during which the CRA can reassess.

Pillar Two and the Combined Group

If the purchaser's group, the target's group or the combined group meets the €750 million revenue threshold for the global minimum tax, the target's jurisdictional effective tax rates become part of the purchaser's compliance and cost picture. Low-taxed foreign affiliates, local incentives and the data needed for global minimum tax returns should be reviewed as part of diligence.

Translating Findings Into Deal Terms

Diligence findings are useful to the extent they are quantified and assigned. Depending on their size and likelihood, exposures may be addressed through purchase-price adjustments, specific indemnities, escrows or holdbacks, targeted representations, or pre-closing remediation such as corrective filings or a voluntary disclosure. Known issues are commonly excluded from warranty and indemnity insurance, which makes specific protection more important.

Findings should also inform the post-closing plan: which affiliates to retain, how cash will be repatriated and which structures to simplify.

Cross-border diligence is ultimately a conversion exercise, turning technical tax findings into decisions the deal team can understand and price. Involving international tax specialists when the structure chart is first shared, rather than after the data room closes, leaves more room to address what they find.

This brief provides general information and is not advice for a specific situation.