Indirect Partial Liquidation: The Swiss Tax Trap That Can Cost the Seller Dearly

Indirect partial liquidation is the Swiss tax rule that turns part of a supposedly tax-free capital gain into taxable income when the buyer pays for the business, in whole or in part, out of the company's own reserves rather than its own funds. It sits among the costliest blind spots in Swiss succession tax planning: it almost never shows up at closing, but sometimes years later, once the seller has long since filed the sale away as finished business.

What sits behind the capital gains exemption

The starting rule, and its blind spot

Under Swiss tax law, a gain realised by an individual selling shares held as private assets is, as a rule, exempt from income tax: what counts is the sale price, with no distinction between the portion that reflects the company's operating substance and the portion that reflects reserves built up over the years. Tax authorities identified the gap in that rule long ago: if the buyer finances part of the price by distributing, once in control, the target's own cash or reserves rather than its own money, the transaction looks a great deal like a dividend dressed up as a share sale. The seller then receives, as an exempt capital gain, what is economically a dividend that should have been declared as income.

Non-operating substance, the term that matters

The key concept, in the legislation and in cantonal tax practice, is non-operating substance: the cash, securities or surplus assets that are not needed to run the business at the time of the sale. An industrial SME that has built up, over years of profitable trading, reserves well above what its working capital requires is a textbook case. Only the portion of the price tied to that surplus substance is at stake, measured as at the date of the transaction, not the entire sale price.

A five-year clock that keeps running after signing

The rule is not triggered at the sale itself but within the five years that follow: if, during that window, the non-operating substance identified at the sale date is distributed to the new owner, with the seller's involvement or knowledge, the tax authority reclassifies the corresponding portion of the gain retroactively. A seller can therefore receive, years after leaving the company, a reassessment that reopens a deal considered long settled.

A concept often confused with transposition

The rule is distinct from a neighbouring one, transposition, which applies when a shareholder moves a participation from private assets into a company they themselves control, typically a holding company set up to buy their own business. Both rules chase the same logic, stopping substance built up free of income tax from coming out untaxed, but they cover different situations, and a seller can easily be exposed to one without being exposed to the other. Mixing the two up, which happens often in early conversations with a buyer, leads either to underrating the real risk or to worrying about a problem the deal at hand does not actually raise.

How the trap closes in an ordinary handover

Financing that draws on the company's own cash

The pattern that comes up most often in the mandates I run is not exotic: a buyer, frequently an in-house manager or an outside investor with limited capital of their own, structures part of the price as a dividend paid by the company once the deal closes, or repays a bank loan taken out for the purchase using the very cash sitting in the acquired company. Seen from the buyer's side, it is a rational way to finance a takeover without a disproportionate personal contribution. Seen from the tax authority's side, if that substance already existed at the time of sale and it ends up paying, directly or indirectly, for the agreed price, the line between acquisition financing and a disguised distribution disappears.

Complicity you never had to intend

A common misunderstanding among sellers is to assume the rule only bites if they deliberately engineered the scheme. Administrative practice reads it more broadly: it is enough that the seller knew, or should have known, that the financing would rely on that substance, for instance because the negotiated price clearly exceeded what the buyer could otherwise raise, or because the agreement explicitly built in a vendor loan repaid from future dividends. Agreeing to that kind of structure without asking how the buyer actually intends to repay it is enough to create the exposure, even in complete good faith.

A seller who negotiates mainly the figure written into the letter of intent, without ever asking how that figure will be paid, leaves the question to someone who has no reason to worry about it.

What it costs, in real terms

Reclassification turns the affected portion of the gain, previously exempt, into taxable investment income at the ordinary combined federal and cantonal rate, which commonly runs between twenty and forty percent depending on the canton of residence and the taxpayer's bracket, on top of a withholding tax question of thirty five percent on the distribution itself, recoverable only in part depending on the structure. On surplus substance of one to two million francs, nothing unusual for a Swiss SME that has traded profitably for decades, the gap between an exempt capital gain and a reclassified income easily runs into hundreds of thousands of francs, sometimes claimed years after the seller has already received and spent the proceeds.

How to structure the sale so it does not bite

Clear out the substance before you sign

The most direct safeguard is to distribute the surplus cash or reserves as an ordinary dividend before the sale, not after, while the seller still owns the company: the payment is then a straightforward dividend, taxed as such under the normal rules, with no ambiguity about its nature, and the price still to be negotiated reflects a business genuinely stripped of its surplus substance. This clean-up is typically prepared twelve to twenty four months ahead of a sale, not in the weeks before signing.

Look at how the buyer finances, not just how much

A well-advised seller examines the financing the buyer puts together with the same rigour the buyer applies to the seller's own numbers during due diligence. Where does the cash promised at closing actually come from: the buyer's own funds, external bank debt, or a future dividend pulled from the acquired company? Asked early in the negotiation, that question often reshapes the offer itself, rather than surfacing later in a tax audit.

A contractual guarantee, not trust

When part of the price still depends on the buyer's future financing, a specific indemnity clause, making the buyer liable for any extra tax the seller owes if the deal is reclassified as an indirect partial liquidation, shifts the financial risk onto whoever actually controls the decision to distribute the substance within the five year window. That kind of guarantee does not remove the tax risk itself, but it stops it from landing solely on the person who no longer has any say over the company's decisions once they have left. In practice, that clause is worth pegging to the actual length of the risk, five years from the sale rather than the one or two years many standard warranties default to, and worth pairing with a notice mechanism obliging the buyer to inform the seller before any significant distribution during that window. A partial escrow, released once the five years pass without a problematic distribution, adds a further layer of security while trust between the parties is still being built.

The mechanism stays widely unknown because it never shows up when sellers expect it, at signing, but years later, in a reassessment few still connect to a sale they consider closed. Guarding against it is less a matter of distrusting the buyer than of asking one simple question, too often skipped: who, exactly, is going to pay this price, and with what money.