What are the tax steps for Cross-border M&A tax due diligence?

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Answer

Diligence prices those exposures, decides which are covered by indemnity and which by escrow, and shapes the acquisition structure so the buyer inherits a defensible base rather than an open one. Each step forecloses or preserves an option in the next one, which is why the order is not cosmetic.

The steps, in order

Diligence prices those exposures, decides which are covered by indemnity and which by escrow, and shapes the acquisition structure so the buyer inherits a defensible base rather than an open one. Post-closing integration then has its own filing consequences in every jurisdiction touched.

Two of the firm’s advisers and the team in the open-plan office

The case that is treated differently

In a cross-border deal, the historic tax exposures that matter most are rarely on the income tax return: they are unfiled information returns, undocumented intercompany pricing and unremitted withholding.

What are the tax steps for Cross-border M&A tax due diligence?
ItemAmount
Income taxed in both countriesC$125,000
Tax paid abroad (assumed 27%)C$33,750
Home tax on the same income (assumed 42%)C$52,500
Credit available (lesser of the two)C$33,750
Home tax still payableC$18,750

The credit absorbs C$33,750 and leaves C$18,750 payable at home, because the home rate on this income is the higher of the two. The balance is real cash and it is due on the home timetable, which is why instalments get raised in the first meeting.

An illustration, not a client file. The sums are chosen for legibility and the thresholds are stated for the example alone — nothing reaches a filing until it has been confirmed at source for your own year.

What to do next

The full treatment — who it binds, the deadline, the penalty and the fixed fee — is on Cross-border M&A tax due diligence. If a letter prompted this, bring the letter — it usually contains the answer to half the questions.

Reviewed for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. Published as general information. For a position on your own file, call the 24-hour helpline.

M&a tax, in practice

Most readers of this page are looking for m&a tax. What follows sets out how it works for cross-border M&A tax due diligence: who is caught by it, what has to be filed, and what the work costs, agreed before it begins.

People also search for: 2024 income tax return · form 5713.

Cross-border tax case studies

Case study 1

Unfiled information returns priced before the price was agreed

The target had made payments to related parties abroad going back years and had never filed the information returns that go with them. The exposure arose per form and per year, and it appeared nowhere in the tax charge the buyer had been shown. We established which filings were missing, for which years and in which jurisdiction, and counted them. The engagement produced a quantified schedule of the omissions, a view on which years remained open, and the amount the buyer used in negotiating how the exposure would be held back.

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Case study 2

Intercompany pricing with no documentation behind it

Charges ran between the target and its affiliates on a basis nobody could explain, and there was no documentation made at the time in any of the jurisdictions involved. We looked at what each entity actually did for the others, covering functions, people and assets, and compared that with how the charges had been set. The mismatch was the finding. The engagement produced an assessment of the exposure in each open year and jurisdiction, a view on which part was a pricing argument rather than an omission, and the drafting instruction that followed for the indemnity.

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Case study 3

Withholding deducted from payments abroad and never remitted

A review of the target payment records, rather than its returns, showed amounts deducted from payments to non-residents that had not reached the authority. Because the obligation sits with the entity, a share purchase would have carried it across. The amount was quantifiable from the records themselves, which changed how it could be dealt with commercially. The engagement produced the reconstructed remittance position year by year, and a recommendation that the exposure be held in escrow and released as each year closed rather than left to an indemnity claim.

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Case study 4

Acquisition structure shaped around the diligence findings

The buyer had settled on a share purchase before the review started. The historic exposures found were attached to the entity and would have come across with it, protected only by whatever the agreement said. We set out what each alternative structure did to those exposures and what it cost in each jurisdiction the business operates in. The engagement produced a comparison the buyer could decide on, and the structure eventually used left part of the history behind and covered the remainder contractually, so the base acquired was defensible rather than open.

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Case study 5

Exposures divided between indemnity and escrow

Diligence had produced a long list of findings of very different kinds, and the draft agreement treated them all the same way. We sorted them by whether the amount was quantifiable and when it would crystallise, separating countable omissions with open years still to run from exposures whose size depended on how an authority responded. The engagement produced a mapping of each finding to the mechanism that suits it, with the escrow sized to the quantifiable items and its release keyed to the years closing, and defined claims periods for the rest.

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Case study 6

Post-closing filings mapped across each jurisdiction touched

The deal changed ownership, the financial period and the intercompany arrangements, and the assumption on both sides was that filings would carry on as before. Each of those changes created obligations, arising at different times in each country involved. We worked through the jurisdictions one at a time, listing what the change of control triggered, what the shortened period required, and which arrangements had to be redocumented. The engagement produced a post-closing filing calendar by jurisdiction, handed to the buyer finance team before completion rather than assembled after the first deadline was missed.

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Case study 7

A Foreign Subsidiary That Nobody Had Been Reporting

Owning a company abroad triggers an information return separate from the corporate return, with its own penalty. The work is the surplus and income computations behind it, which also determine how a future dividend is taxed on the way home.

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Case study 8

A US Filer Married to Someone Outside the System

Electing to treat a non-resident spouse as a US filer buys joint rates and brings that spouse's worldwide income and foreign accounts into the return. The election is easy to make and hard to revoke, so both positions are modelled first.

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All case studies — every published engagement in one place.

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Documentation prepared with the return is the cheapest insurance in international tax; reconstructing it during an audit is the most expensive.

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Wills drafted for one country routinely misfire in the other — deemed disposition here, estate tax there, credits in between.

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The deduction is taken on the sale price, not the gain — which is why an NRI property sale strands cash unless the certificate is applied for before closing.

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Related-party purchasing, customs value versus transfer price, and foreign-affiliate structures put trading businesses inside the s.247 documentation rules.

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Questions that come up on Cross-border M&A tax due diligence

What tax problems usually turn up in a cross-border acquisition?

Rarely the income tax return. The exposures that matter in a cross-border deal are typically unfiled information returns, intercompany pricing with no documentation behind it, and withholding that was deducted from payments abroad and never remitted. All three share a feature: they do not appear in the target tax charge, so a review of the accounts alone will not find them. Diligence prices them, decides which are dealt with by indemnity and which by escrow, and shapes the acquisition structure so the buyer takes on a defensible base rather than an open one.

Should unfiled information returns go into an indemnity or an escrow?

It depends on whether the exposure can be quantified and when it is likely to crystallise. Exposure that arises per form can be counted, and where the years remain open it is the kind of amount a buyer wants held back where it can be reached, so an escrow sized to the count and released as the years close tends to fit. An exposure whose size depends on how an authority responds sits more naturally in an indemnity with a defined claims period. The work in diligence is to establish which filings are missing, for which years, in which jurisdiction, before arguing about the mechanism.

How do we check intercompany pricing before we buy?

Ask for the documentation first, and treat its absence as the finding rather than as a gap to be filled later. Then look at what the related entities actually did for each other, meaning which functions, which people and which assets, and compare that with how the charges were set. Where there is no support made at the time, the exposure runs in each open year in each jurisdiction the charge touches, and it is a pricing argument rather than a filing omission. That difference decides whether it belongs in the price, in an indemnity or in an escrow.

Do we buy the shares or the assets for tax purposes?

The diligence findings drive that choice rather than the other way round. Historic exposures such as missing returns, undocumented pricing and unremitted withholding attach to the entity, so acquiring shares acquires them and the protection has to come from the agreement. An asset acquisition can leave some of them behind, at the cost of a different set of consequences in each jurisdiction the assets sit in. The point of pricing the exposures first is that the structure can then be shaped so the buyer inherits a defensible base, with the cost of each option visible.

What happens to the target filings after the deal closes?

Integration has its own filing consequences in every jurisdiction the deal touches, and they are separate from the historic exposures diligence found. Changes of ownership, of financial period, of intercompany arrangements and of the people who take decisions all create obligations, and they arise at different times in each country. The usual pattern after closing is that someone assumes the calendars and the arrangements carried over unchanged. Map the post-closing filings jurisdiction by jurisdiction as part of the deal work, so the first period after completion is filed deliberately rather than discovered late.

Who pays for unremitted withholding discovered after closing?

Whoever the agreement says, which is why the finding has to be made before signing. Withholding that was deducted from payments to non-residents and not remitted is an obligation of the entity, so on a share purchase it travels with it. It is usually quantifiable from the payment records, which makes it a candidate for a price adjustment or an escrow rather than an open-ended indemnity. Found after closing, with no provision covering it, the buyer carries it and the argument is commercial rather than contractual.

Is moving money between my own accounts in two countries taxable?

Moving your own capital between your own accounts is not itself income, so the transfer is not what creates tax. What can create tax or reporting is the income the money earned before it moved, a foreign-exchange gain on certain holdings, and the reporting obligations the balances themselves trigger — foreign account and asset reports keyed to balances rather than income. Remittances out of some countries also need certification before the bank will send them. See foreign account reporting.

Do American citizens living abroad have to pay taxes?

American expats and green card holders need to file US returns for life, and many of them pay little or no US tax once the relief is applied — but the filing is what unlocks the relief, so the two questions have different answers. The exclusion for foreign earned income, the credit for foreign tax already paid and the treaty between the two countries between them usually leave the total at roughly the higher of the two countries' tax rather than the sum. Skip the return and none of it applies. See Americans abroad.

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