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MERGER AND ACQUISITION

26 May 2025

Tax Implications of Mergers and Acquisitions

Mergers and acquisitions (M&A) are complex transactions involving integrating separate companies into a single structure. Because of the complexity of these deals, the tax implications directly influence the structure of the eventual deals, the total costs, and the outcome of the deals themselves. Each merger and acquisition tax implication must be carefully evaluated to determine the economic viability of the transaction. In this article we will dive into the overall aspects of tax implications in mergers and acquisitions.

Overview of Tax Implications in M&A

Taxation is one of the major elements in M&A transaction design and negotiation. Decisions made, in fact, can have lasting cost effects with a consequent impact on cash flows as well. The main areas of tax exposure are corporate income tax, capital gains tax, registration taxes, and indirect taxes such as VAT. Timely tax planning is essential to structuring the operation advantageously.

Asset Purchase vs. Stock Purchase Tax Treatment

In M&A transactions, an asset purchase involves the buying and selling individual assets and liabilities of the target company. In contrast, a share purchase involves the direct acquisition of business shares.

From a tax perspective, an asset acquisition allows the buyer to revalue the book value of the purchased assets and benefit from updated depreciation allowances, improving their future tax profile. However, it can result in higher indirect taxes, such as VAT. For the seller, this type of transaction can generate larger taxable capital gains.

In the case of a stock acquisition, the target company remains operationally and contractually intact. It is often preferred for simplicity but does not provide the buyer the same tax flexibility.

Tax Due Diligence in Mergers and Acquisitions

Tax due diligence plays a key role during M&A transactions, allowing the company to identify and prevent tax risks associated with the target business.

Among the various factors to be examined are possible back taxes, ongoing litigation with tax authorities, and the proper management of tax loss carryforwards (NOLs).

Thorough tax due diligence helps avoid unpleasant merger and acquisition tax implications such as penalties or assessments.

Structuring the Deal for Optimal Tax Outcome

Among the most common structures are tax-neutral restructurings, such as qualified mergers or elections under Section 338(h)(10) of the US tax code, which allow the purchase of shares to be treated as assets for tax purposes. In cross-border contexts, complexity increases—due to double taxation treaties and transfer pricing for example—needing excellent coordination between legal and finance teams. That’s why Ascot International can help you better manage M&A tax implications with its tax services. 

Capital Gains and Losses in M&A Transactions

In M&A transactions, capital gains or losses arise from the difference between the selling price of an asset (units, shares, etc.) and its original tax cost. Capital gains are usually taxed, and rates vary by country and jurisdiction (in the US the rate is between 15% and 20%, in the UK at 25%). Another aspect to consider is the realization and recognition of the gain, which do not always coincide—in some jurisdictions, for example, there are deferral regimes that postpone taxation. 

Impact of M&A on Net Operating Losses (NOLs)

Net Operating Losses (NOLs) are tax losses carried forward from previous years, which a company fails to offset against taxable income in the year they arise. The advantage of NOLs is that they can offset future profits, reducing the tax payable in subsequent years. However, in international jurisdictions—such as the US under Section 382 of the federal IRS Code—there are regulatory limitations governing these losses following a change of control. To preserve NOL value, choosing a structure that allows their use, such as a stock deal is important. Applicable regulatory limits need to be evaluated in tax planning.

International M&A Tax Considerations

Cross-border M&A transactions pose additional tax challenges than domestic ones. Among the main issues to be assessed are double taxation, transfer pricing rules, and withholding taxes. Some ways to reduce financial burdens include selecting legal entities in tax-favorable jurisdictions (for example) or setting up intermediate holding companies in countries with more efficient treatment. Repatriation of profits and how they are managed globally can also affect tax planning.

Tax Consequences for Shareholders

Understanding how does a merger affect shareholders is critical to managing consequences. For example, a cash transaction may generate immediate capital gains or losses taxable at the transfer time. If, on the other hand, the transaction is stock-based, shareholders will receive stock in the upcoming company benefiting from tax deferral. Finally, in so-called “mixed deals,” the tax effect is proportional: the cash portion generates immediate tax, while the equity component may be taxed later. In addition, the treatment varies according to share ownership duration: long-term capital gains often enjoy more favorable rates than short-term ones. 

Post-Merger Integration Tax Planning

Once the transaction is complete, the focus shifts to tax management of the created entity. Effective tax planning avoids inefficiencies by preventing double taxation or operating flow misalignments. Indeed, it is essential to analyze the impact on day-to-day aspects such as VAT, personal taxation, sharing plans, and accounting systems. In fact, proper M&A cultural integration can also foster the uniform adoption of tax and administrative policies by acquired business units, improving compliance and cohesion among teams.

Role of Tax Advisors and Consultants in M&A

Merger and acquisition consultants gain great importance because of their expertise. M&A often brings organizational and tax complexity and requires internal reorganization aimed at coordinating various business units and personnel. Tax advisors can help with designing the tax structure of the transaction, identifying and preventing risks, and finding opportunities related to current regulations—among others. 

This support allows processes to be streamlined while optimizing outcomes through informed decisions. This is why Ascot International’s services can prove indispensable during the tax planning process.

FAQs

What are the biggest tax risks in a merger or acquisition?

Major tax risks during an M&A transaction include unknown liabilities, NOL limitations, and incorrect asset valuations. Unknown liabilities (such as litigation or unpaid taxes) can adversely affect the transaction, NOL limitations drastically reduce tax benefits, and incorrect asset valuation sharply affects the final value of the target business. 

How do cross-border mergers impact tax obligations?

Cross-border operations are much more complex due to several factors. Indeed, issues arise, such as withholding taxes on interest or dividends, and proper transfer pricing must be identified for intra-group transactions. Finally, one must consider international tax treaties that can greatly affect costs.  

Can taxes cause a merger deal to fail?

Yes, taxes can make M&A transactions fail. Some causes may be the late discovery of tax liabilities, inability to obtain expected benefits, and inefficient non-tradable structures that may make the transaction too expensive.

How can buyers protect themselves from unexpected tax liabilities?

Buyers can protect themselves through representations and warranties (i.e., formal statements on the company’s tax status), indemnifications (contractual clauses that obligate the seller to indemnify the buyer in the event of undiscovered tax liabilities), and escrow-held on part of the purchase price to cover any future risks.

What is a Section 338(h)(10) election and why is it important?

IRS Code Section 338(h)(10) allows a stock purchase to be treated as an asset purchase. This favors the buyer who can obtain depreciation benefits and the seller by obtaining more favorable capital taxation. 

References

Bloomberg Tax. (2023). Tax Considerations in M&A and Restructuring

https://pro.bloombergtax.com/insights/federal-tax/tax-considerations-in-ma-and-restructuring

KPMG LLP. (2018). Taxation of Cross-Border Mergers and Acquisitions.

https://assets.kpmg.com/content/dam/kpmg/xx/pdf/2018/04/taxation-of-cross-border-m-and-a.pdf

Meier, J.-M., & Smith, J. (2020). Tax Avoidance through Cross-Border Mergers and Acquisitions. Proceedings of Paris December 2021 Finance Meeting EUROFIDAI – ESSEC.

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3639640

Ohrn, E., & Seegert, N. (2019). The Impact of Investor-Level Taxation on Mergers and Acquisitions. Journal of Public Economics, 176, 1–17. 

https://ideas.repec.org/a/eee/pubeco/v177y2019ic1.html

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