Typical due diligence issues

The focus of a legal due diligence in the context of mergers and acquisitions in Switzerland will mainly depend on the industry involved as well as the target company's age, size and structure (start-up, market leader, etc.). However, the following issues are typically considered in a due diligence: corporate matters (e.g., issues in connection with evidencing a proper share history of the target company often arise), commercial contracts (e.g., change of control or exclusivity provisions in material agreements), financing/loan agreements, real estate (e.g., land register entries, leases), employment matters, IP, litigation, regulatory and compliance issues (e.g., environmental law, data protection, industry-related compliance).

A legal due diligence usually entails a review of the relevant documents which are in the vast majority of cases provided in virtual data rooms. Issues identified by the parties or their respective counsels are then generally either remedied prior to signing or dealt with when negotiating the terms of the transaction (e.g., conditions precedent to closing, reduction of purchase price or specific indemnities).

Pricing and payment

Swiss law does not require an independent appraisal for private share or asset deals. Financial due diligence is common, especially for larger transactions.

Independent appraisers are usually involved by the parties if the share purchase agreement includes a post-closing purchase price adjustment. In such cases, a provision is common according to which any party may refer the determination of the purchase price adjustment to an independent expert if the parties cannot agree on a proposed adjustment.

In general, apart from tax considerations, there are no restrictions with regard to pricing, currency or payment of the purchase price in relation to a share or asset deal provided that a minimum purchase price must be agreed.

Signing/closing

Share sale

The purchase of shares of a Swiss company is usually agreed upon in a comprehensive share purchase agreement. While no notarization is needed, a share purchase agreement is almost exclusively concluded in writing and will govern the rights and obligations of the parties.

Asset sale

The structure, content and form of an asset purchase agreement will depend on the assets in question (a public deed is required in the case of a transfer of real estate). Swiss law enables the universal transfer of assets and liabilities (e.g., a business) by operation of law under the Merger Act. The Merger Act entails an enhanced protection of creditors, in particular the three-year joint and several liability of the transferor of liabilities. This is one of the reasons why the majority of asset deals are today still usually carried out by way of an individual transfer of assets and liabilities. However, the universal transfer of assets and liabilities under the Merger Act may be particularly useful where several real estate properties are to be transferred, in which case only one public deed is required, and all the real estate properties concerned are transferred at the time the transfer agreement is registered with the commercial register. However, similar results regarding the transfer of real estate properties can be achieved by contributing the properties in kind into a newly incorporated corporation.

Closing

In major transactions, signing and closing will often not occur simultaneously, either due to mandatory approvals (e.g., merger control approval) or closing being subject to certain further conditions precedent.

Foreign investment restrictions

Switzerland does not have a foreign investment screening procedure in place. However, the Swiss Federal Investment Screening Act (ISA) is expected to enter into force by 2027.

Antitrust/merger control

Switzerland has a mandatory and suspensory merger control regime, which means that transactions that meet the relevant criteria need to be notified to the competition authority and cleared before they can be completed. For further information, see the more detailed section on "Antitrust/merger control".

Other regulatory or government approvals

Approvals from relevant authorities may be necessary if the business being acquired operates in a regulated sector. Switzerland is in the process of introducing a foreign direct investment (FDI) screening regime, marking a departure from its traditionally liberal approach to foreign investment. In December 2025, Parliament adopted the Swiss Federal Investment Screening Act (ISA), which will introduce a mandatory notification and approval requirement for certain acquisitions of Swiss companies by foreign investors. The ISA applies only where (i) the acquirer qualifies as a foreign state‑controlled investor, (ii) the transaction results in the direct or indirect acquisition of control over a Swiss company (minority investments without control being excluded), and (iii) the target operates in a sensitive or system‑relevant sector and meets the applicable turnover or employee thresholds. The substantive review focuses on whether the transaction may endanger Swiss public order or security. Responsibility for the review lies primarily with the State Secretariat for Economic Affairs (SECO), with escalation to the Federal Council in cases of political significance. The ISA is expected to enter into force in early 2027 following the adoption of implementing ordinances.

Share sale

In share deals, there is no change in the relationship between employer and employee. As a consequence, neither consent from employees nor notices to employees are required due to the sale of the shares as such.

Asset sale

In an asset sale that involves the transfer of a business or a business unit (part of a business) as a going concern, as well as in mergers and spin-offs, employees belonging to the business or to the business unit automatically transfer to the buyer by operation of law, including all rights and obligations. The parties to the transfer of a business are not free to choose which employees will transfer with the business or business unit. Employees have a right to object to their transfer. In case an employee objects to the transfer, the employment relationship is terminated upon expiry of the statutory notice period.

Terms and conditions of employment in principle remain unchanged after the transfer, and the new employer must recognize the employees' years of service. The buyer, as the legal successor of the former employer takes over all employment-related liabilities (including those which have become due prior to the transfer date) towards the transferred employees, but the former employer remains jointly and severally liable for any of employees’ claims which have become due prior to the transfer and which will later become due until the date upon which the employment relationship could have validly been terminated or is actually terminated as a result of the employee’s objection. Compensation for the automatic assumption of liabilities should be addressed in the transaction documents.

Pensions

Pension schemes and the transfer of pension liabilities need to be considered carefully in the transaction context, including that Swiss defined contributions plans qualify as defined benefit plans under International Financial Reporting Standards (IFRS) and that such requalification may result in unfunded actuarial liabilities.

In case of an asset deal, the assets sold are generally subject to VAT. However, groups of assets and liabilities that comprise a single autonomous business unit may be transferred by using a declaration procedure instead of invoicing with VAT (the so-called "transfer of a going concern" or TOGC). Special transfer taxes may apply, in particular in the case of a transfer of real estate. The costs of financing are, in principle, fully tax-deductible. However, if financing is provided by a related company or provided by third parties, but guaranteed by a related company, the tax regulations on the maximum debt-to-equity ratios must be observed and interest payments made have to comply with the arm's length standard.

In the case of a share deal, the transfer of shares is exempt from VAT. It may be subject to securities transfer tax if the seller, the buyer, or an intermediary is a professional securities dealer within the meaning of the Swiss Federal Stamp Duty Act. In some cantons, a share deal may also be subject to real estate transfer tax. In addition, in a share deal, tax liabilities embedded in the acquired company are indirectly transferred to the buyer. This may apply to the deferred withholding tax liability on the distributable reserves of the acquired company that are not necessary, from a commercial point of view, for the company's ongoing operations, and if the applicable withholding tax rate on dividend distributions to the seller (as former shareholder) would have been less favorable than the rate on distributions to the buyer (the "old reserves doctrine”). These reserves remain tainted and subject to the (less favorable) rate applicable to the seller as a former shareholder when distributed to the buyer.

A capital gain realized by a Swiss resident individual on the sale of shares held as private assets (as opposed to business assets) is, as a general rule, tax-free. Depending on how the acquisition is structured, in particular if the buyer finances the acquisition with assets of the acquired company, the tax authorities may requalify the tax-exempt capital gain realized by an individual seller as a partial liquidation distribution, and requalify and subject a part of the gain to ordinary income taxation of the seller. It is thus common practice in Switzerland for a private individual seller to ask for a corresponding representation or an indemnification in the event that the transaction could qualify as an indirect partial liquidation.

A debt push-down through a merger of an acquisition vehicle and the target company is usually not accepted by the Swiss tax authorities for the purpose of obtaining a tax deduction of the financing costs, as it is usually argued that the merger represents a tax avoidance scheme. Besides that, a debt push-down may trigger the above-mentioned indirect partial liquidation.

A restructuring, in particular mergers, spin-offs, and changes in legal form, may qualify as a tax neutral restructuring provided that certain general and, depending on the nature of the transaction, other transaction-specific conditions are met. The general requirements are (1) continuation of the tax liability in Switzerland and (2) book values remain unchanged during the restructuring.

OECD's Two Pillar Solution

The OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting has put forward a so-called Two-Pillar Solution to address the tax challenges arising from the digitalization of the economy. Pillar Two is intended to introduce a global minimum effective tax rate of 15% for large businesses in each jurisdiction in which they operate and will lead to fundamental changes in the international tax system. It is currently being implemented in a large number of jurisdictions.

Groups will need to consider how the Pillar Two rules could impact the life cycle of M&A transactions from the pre-acquisition phase (including transaction planning (such as the choice of acquisition structure and financing) and due diligence of the target group), through the acquisition phase (such as contractual risk allocation in the context of Pillar Two) to the post-acquisition phase and the impact of Pillar Two on any post-acquisition integration.

For information on post-acquisition integration matters, please see our Post-acquisition Integration Handbook.