- · Indirect partial liquidation (IPL) can requalify a tax-exempt capital gain into taxable income, years after a deal closes.
- · The Federal Supreme Court confirmed supplementary tax assessments against former shareholders in December 2023 (rulings 9C_665/2022 and 9C_666/2022).
- · IPL is triggered only when five cumulative conditions are all met — breaking even one eliminates the risk entirely.
- · Structured anticipation, including pre-sale distributions, contractual protections, and tax rulings, costs a fraction of the supplementary tax and interest that can arrive long after closing.
Swiss tax law is famously favourable to the private seller of shares. A natural person selling a qualifying stake held in private wealth generally realises a capital gain that is entirely exempt from income tax. For many SME owners approaching succession, this exemption is the financial cornerstone of their exit. The company is sold, the proceeds arrive, and the tax question appears to be settled.
It is not always settled. A specific anti-abuse provision embedded in Article 20a of the Federal Act on Direct Federal Taxation introduces a mechanism known as indirect partial liquidation (IPL). When triggered, it requalifies part of that tax-exempt capital gain as taxable income, assessed through a supplementary tax procedure that can land on the seller's doorstep years after the transaction has been completed, signed off, and largely forgotten.
As Bär & Karrer summarise the position: "In case of an indirect partial liquidation, proceeds from the sale of privately held shares are re-characterized from tax exempt income into taxable dividend income at the level of a Swiss resident individual seller." The logic is straightforward even if the mechanics are not: if a buyer finances the acquisition price by extracting the target company's own cash reserves shortly after closing, the economic effect is indistinguishable from a dividend that the seller should have received and paid tax on. The tax authority intends to capture that effect.
Three converging developments make IPL one of the more consequential structuring considerations for Swiss SME transactions this year.
First, the Federal Supreme Court issued rulings 9C_665/2022 and 9C_666/2022 on 14 December 2023, dismissing appeals brought by former shareholders who contested supplementary tax assessments raised against them. The Court confirmed that the requalification rested on a correct application of the IPL conditions. These rulings remove any residual ambiguity about the administration's willingness to pursue former sellers years after a transaction.
Second, the Zurich Tax Office published new practice notices on 16 December 2025 — documented in the Primetax analysis of those notices — clarifying the relevant balance sheet date and the treatment of group companies when determining commercially distributable reserves. The notices are declaratory rather than legislative, but they carry immediate operational significance for transactions involving holding structures.
Third, a legislative reform is in preparation to clarify the IPL rules more broadly. Until that reform is enacted and its scope is understood, sellers must navigate existing law as it stands.
Compounding all of this is a structural market trend: the rise of acquisition holdings and leveraged buyout structures in the Swiss SME segment. Buyers using leverage routinely plan to service debt using the target company's distributable reserves. That is the precise fact pattern that IPL was designed to address, and each such transaction mechanically increases the pool of sellers who may face retrospective requalification.
The statutory definition under Article 20a, paragraph 1, letter a of the Federal Act on Direct Federal Taxation is precise. IPL applies to proceeds from the sale of a participation of at least 20%, representing a transfer from the private wealth of a natural person to the business assets of another natural person or a legal entity, provided that non-operating substance, existing and distributable under commercial law at the time of sale, is distributed within five years with the seller's participation.
That statutory language maps onto five cumulative conditions. Because all five must be satisfied simultaneously, the seller who understands each one holds a significant structuring advantage: breaking any single condition breaks the chain entirely.
The sale must concern a stake of 20% or more in a company limited by shares or a cooperative. Aggregation applies across a five-year window, so multiple smaller sales that together reach the threshold are treated as one.
The shares must move from the seller's private wealth into the business assets of the buyer, typically an acquisition holding or another legal entity. A buyer who acquires the shares personally and privately fails this condition, ruling out IPL on that basis alone.
The target company must hold, at the time of sale, reserves that are not required for continuing operations and are legally distributable under commercial law. Surplus cash is the standard example; non-operating assets, investment property, and unrelated participations may also qualify. The assessment applies business-economics criteria to distinguish working capital from surplus.
The risk period does not end at signing or at closing. Any distribution of that non-operating substance within five years of the sale may trigger requalification, provided the other conditions remain satisfied. A seller who considers the matter closed at the moment of transfer underestimates the exposure by exactly five years.
The distribution must occur with the seller's participation — meaning the seller knew, or should have known, that funds would be taken from the company to finance the purchase price and would not be returned. This is the condition most frequently litigated, and it is assessed on the basis of contractual and financial indicators present at the time of the deal.
When all five conditions are met, the requalified amount is capped at the lowest of three figures: the non-operating substance at the time of sale, the reserves distributable under commercial law, and the amount actually distributed by the buyer. Since 2020, holders of qualified participations of at least 10% benefit from partial taxation: 70% of the requalified amount is added to the seller's income and subjected to federal and cantonal tax through a supplementary tax procedure, together with default interest on the outstanding amount.
The Hectelion case illustration makes the arithmetic concrete. A Geneva shareholder sells 100% of a services SME held in private wealth for CHF 8.0 million. The company holds CHF 2.0 million in surplus cash, not required for operations and legally distributable. The buyer, an acquisition holding, extracts that cash as a dividend within three years to part-finance the purchase price. The seller was aware of the financing structure. All five conditions are met. The CHF 2.0 million is requalified as capital income; with partial taxation, CHF 1.4 million is added to taxable income and assessed through a supplementary tax procedure — a charge that considered structuring could have prevented entirely.
The framing matters here: IPL is a structuring problem, not an immovable legal trap. Each of the five conditions represents a point at which a seller and their advisors can intervene.
If the company distributes its surplus cash as a dividend before closing, the non-operating substance no longer exists at the time of sale and condition three fails. The distribution is taxable, but it is taxable at a known rate, in a controlled amount, at a time of the seller's choosing. The headline sale price will be adjusted downward to reflect the extraction, but the requalification risk is eliminated.
If the purchase agreement specifies, and the deal mechanics confirm, that the buyer is financing the price from own equity or third-party bank debt rather than from the target's reserves, the distribution condition does not arise. No substance extracted means no IPL.
A five-year prohibition on distributing the existing substance, included in the purchase agreement and backed by indemnification provisions in favour of the seller, addresses the subjective condition. If the seller has contractually prohibited the very distributions that would trigger requalification and secured compensation if they occur anyway, the argument that the seller knew or should have known becomes considerably more difficult to sustain.
Submitting a precise description of the contemplated transaction to the relevant cantonal tax administration — and to the federal administration where appropriate — and obtaining written confirmation of the tax treatment converts uncertainty into a known position. A ruling obtained in good faith binds the administration. It is also, practically speaking, the clearest evidence available that the seller approached the transaction with diligence.
Not all cash on a balance sheet is non-operating substance. Working capital required for the operating cycle, provisions against known liabilities, and distributable reserves that are subject to commercial law restrictions must each be disaggregated. A precisely documented bridge from total cash to distributable non-operating substance serves both the structuring analysis and any ruling request, and it substantially strengthens the seller's position in the event of an audit.
The supplementary tax assessment arrives with default interest. It covers cantonal and federal tax on a requalified amount the seller may have spent, invested, or distributed to heirs years earlier. The procedural burden of contesting it — as the shareholders in the 2023 Federal Supreme Court cases discovered — is substantial and does not guarantee success.
The cost of anticipation is the professional time required to audit the deal structure, quantify the substance, negotiate appropriate contractual provisions, and if warranted, obtain a ruling. Placed against the potential tax charge plus interest on a seven-figure requalification, the arithmetic consistently favours early and thorough structuring.
A seller who understands the five criteria can audit their own transaction before signing, identify which conditions are present, and act on the levers available. The framework is knowable. The outcome, with competent structuring, is manageable. The risk that remains unexamined is the one that tends to materialise.
This post is a market observation and does not constitute tax advice, legal advice, or any form of investment recommendation. Readers should consult qualified Swiss tax counsel in connection with their specific circumstances.
