- · A tax-exempt capital gain from selling your Swiss SME can be retroactively requalified as taxable income under the Indirect Partial Liquidation (IPL) rule, Article 20a LIFD.
- · Five cumulative conditions must all be met for IPL to apply — breaking any single one prevents the requalification entirely.
- · The Federal Supreme Court confirmed active enforcement in December 2023, and the Zurich Tax Office sharpened the calculation rules in December 2025.
- · IPL must be prevented before closing; there is no meaningful remedy after the fact.
For most Swiss SME owners, the sale of their company shares held in private wealth is a tax-exempt event. Switzerland does not impose a federal tax on private capital gains, and this principle is central to the attractiveness of Swiss holding structures for entrepreneurs. Yet there exists a statutory carve-out — codified in Article 20a of the Federal Act on Direct Federal Tax (LIFD) — under which that gain can be stripped of its exemption and reclassified as taxable income, sometimes years after the transaction closed.
This mechanism is known as the Indirect Partial Liquidation, or IPL. The name is technical, the consequence is material, and the timing is, by design, deferred. A seller who completes a clean transaction, receives full payment, and moves on may receive a supplementary tax assessment years later, compounded by default interest and, in certain cases, an evasion procedure. The tax authority is not required to act immediately; it has time.
What makes IPL particularly demanding for deal participants is its structure: it requires five conditions to be satisfied simultaneously. The chain holds only when all five links are intact. Remove one, and the requalification cannot occur. Understanding what those five conditions are — and how recent legal and administrative developments have tightened them — is now a necessary part of preparing any SME transaction in Switzerland.
The seller must dispose of at least 20% of the share capital of a corporation or cooperative. This threshold is not assessed on a transaction-by-transaction basis in isolation; it applies to aggregated blocks sold within a rolling five-year window. A seller who divests in tranches should not assume that each tranche is evaluated independently.
IPL applies only when shares are transferred from the seller's private wealth into the business assets of the buyer. Concretely, this means the acquirer is typically a legal entity — most often an acquisition holding company — or a natural person who records the acquired shares on their commercial balance sheet. A sale to a private individual purchasing in their personal, non-commercial capacity does not satisfy this condition. The structure of the buyer matters, not merely the identity.
At the time of the sale, the target company must hold commercially distributable substance that is not operationally necessary. Surplus cash is the textbook case, but investment properties and participations unrelated to the core business also qualify. The rule looks at what could be taken out of the company without impairing its ordinary operations.
This condition became significantly more demanding following the Zurich Tax Office's Praxismitteilung No. 20A.3, published on 16 December 2025. That notice specifies that distributable reserves must be assessed across the target company and all subsidiaries and sub-subsidiaries under unified management, with each entity analyzed separately on its own balance sheet. Losses in one group company cannot be used to offset reserves held elsewhere. Minority interests are excluded from the calculation. In practical terms, this closes an avenue that some structures had used — keeping liquidity in subsidiaries while presenting a leaner picture at the target level.
The non-operating substance identified above must actually be distributed to the buyer or otherwise extracted from the target within five years of the sale. This is where the deferred nature of IPL exposure becomes apparent: the seller remains at legal risk for five years after closing, during a period when they no longer hold the shares and exercise no control over the buyer's decisions regarding the company's balance sheet. The clock runs regardless.
A related clarification was issued by the Zurich Tax Office in Praxismitteilung No. 20A.2 (16 December 2025), which addressed the determination of the relevant balance sheet date. The notice clarifies that the last annual financial statements approved by the General Assembly prior to the sale determine distributable reserves. Where the sale occurs more than six months after the balance sheet date, the profit of the preceding financial year is treated as distributable substance, irrespective of whether an AGM has convened in the interim. This has a direct mechanical consequence: a transaction completed in the second half of the calendar year, or one preceded by a deliberate deferral of the AGM, may carry a larger calculated IPL exposure than the seller anticipated. The PrimeTax analysis of these notices (June 2026) provides a useful walkthrough of the practical implications.
The fifth condition is the most contested in litigation. The distribution must occur with the seller's knowledge or constructive knowledge. Article 20a paragraph 2 LIFD defines this participation as the seller knowing, or having reason to know, that funds would be withdrawn from the company to finance the acquisition price and would not be replenished. This is the subjective element of IPL, and tax authorities examine both contractual terms and financial indicators to establish it. A seller who negotiated a price that was only achievable through the target's own cash reserves — and who could be shown to have understood this — faces a difficult argument.
The question of whether IPL represents an active enforcement priority or an abstract statutory provision was answered definitively in December 2023. In rulings 9C_665/2022 and 9C_666/2022 (14 December 2023), the Federal Supreme Court upheld supplementary tax assessments against former shareholders who had challenged IPL determinations arising from a 2008 share sale and a 2013 merger. The Court confirmed that the seller-side participation requirement was satisfied where the sellers knew, or should have known, that non-business assets would be used to finance the purchase price and would not be replenished.
The practical significance of this ruling is not its legal novelty — the foundational framework was established in the Federal Tax Administration's Circular No. 14 of 6 November 2007 — but its confirmation that IPL proceedings are brought, pursued, and upheld. Sellers who assumed the rule was rarely invoked now have explicit guidance to the contrary.
When the five conditions are cumulatively established, the requalified amount is added to the seller's taxable income for the relevant year through a supplementary tax procedure. Since 2020, where the seller held at least 10% of the share capital, the amount benefits from partial taxation applicable to returns on qualified participations: the taxable base is reduced to 70% at the federal level. This relief is meaningful but does not eliminate the charge. The effective outcome is a retroactive tax assessment, often arriving years after the transaction, accompanied by default interest and, where evasion findings are made, additional procedures.
As Hectelion's guide on Indirect Partial Liquidation (2026) notes, the five-year exposure window means that sellers and their advisers must structure defensively at the time of the transaction, not after.
IPL is a condition that is prevented, not corrected. Once the five-year distribution has occurred and the tax authority has initiated proceedings, the seller's options are narrow. Before and during a transaction, however, several structuring levers exist.
A pre-sale dividend — where surplus reserves are distributed to the seller as an accepted dividend prior to closing — reduces the non-operating substance in the target and therefore lowers or eliminates the third condition. This approach requires tax coordination, as the dividend itself is taxable, but the net position may be favorable relative to an unplanned IPL assessment.
Ensuring the buyer finances the acquisition price from external sources, without drawing on the target's own cash, addresses the fourth and fifth conditions. Where the acquisition finance is demonstrably external and the purchase price reflects stand-alone equity value, the factual basis for IPL is weakened.
Contractual non-distribution clauses, supported by indemnification provisions, can serve as a structural safeguard, placing the legal and financial risk of any distribution on the buyer. These provisions require careful drafting and are not self-executing; they shift risk rather than eliminate it.
Finally, a binding tax ruling obtained from the cantonal authorities before closing provides the highest degree of certainty. The ruling process requires disclosure of the transaction structure, but it converts a probabilistic risk into a documented position.
Each of these approaches requires coordination among the tax adviser, the transaction lawyer, and the deal team well before signing. IPL does not reward late attention.
The December 2025 Zurich Tax Office notices serve as a reminder that administrative practice surrounding IPL continues to evolve. Transactions structured under assumptions formed before those clarifications — particularly regarding group-wide substance calculations and balance sheet date determinations — may carry exposures that were not modeled at the time. Sellers and their advisers with open five-year windows on completed transactions would be well served by revisiting the applicable facts in light of the updated guidance.
For transactions in preparation, the analytical starting point is now more demanding: distributable substance must be traced through the entire group structure, entity by entity, before a defensible position on IPL exposure can be formed.
The content of this article constitutes market observation and general information only. It does not constitute tax advice, legal advice, or any form of recommendation. Readers should consult qualified advisers with respect to their specific circumstances.
