Lex Koller Switzerland: What Sellers Must Know About Foreign Buyers

You've found a foreign buyer for your Swiss property — great news, right? Not so fast. Switzerland's Lex Koller (officially the Federal Act on the Acquisition of Real Estate by Persons Abroad) imposes strict rules on selling property to foreign nationals. As a seller, understanding these rules is essential: they affect your sale timeline, your buyer pool, and sometimes even the price you can achieve. This guide breaks down the Lex Koller from the seller's perspective, canton by canton.

What is the Lex Koller?

Adopted in 1961 and substantially revised in 1983, the Lex Koller — named after the Federal Councillor who championed it — is Switzerland's federal law restricting the acquisition of real estate by persons abroad. Its original purpose was clear: prevent foreign capital from driving up Swiss property prices and turning scenic regions into enclaves of non-resident owners.

The law operates on a simple principle: foreigners may not acquire residential property in Switzerland without cantonal authorization. The federal framework sets the baseline, but each canton enforces it — sometimes more strictly, sometimes with notable exceptions.

Since 2018, the Swiss government has explored tightening the law further, particularly around nominee structures (Swiss-registered companies acting as fronts for foreign owners). While full legislative reform is pending, the enforcement trend is clear: more scrutiny, not less.

Who counts as a "foreigner" under the Lex Koller?

The Lex Koller defines "persons abroad" more broadly than you might expect. It's not just about nationality — it's about residence status.

Foreign nationals residing abroad

The most obvious category: individuals who are neither Swiss citizens nor resident in Switzerland. A German living in Munich, a British citizen in London, a Chinese national in Beijing — all are subject to the Lex Koller when buying residential property in Switzerland.

Cross-border commuters (frontaliers)

Cross-border commuters — people who work in Switzerland but live in a neighboring country — are subject to the Lex Koller. Even though they contribute to the Swiss economy daily, their foreign residence places them under the law's restrictions. They cannot freely purchase a second home or holiday apartment in Switzerland.

EU/EFTA vs. third-country nationals

The distinction between EU/EFTA citizens and third-country nationals matters, but not under the Lex Koller itself. Under the law on foreign nationals (LEtr), EU/EFTA citizens with a Swiss residence permit (B or C) enjoy easier access to the housing market. However, for non-resident EU/EFTA nationals, the Lex Koller applies just the same as for anyone else abroad.

Swiss-registered companies with foreign control

A company incorporated in Switzerland but controlled by foreign nationals (majority shareholders or voting rights abroad) falls under the Lex Koller. This is a critical point: the law looks through corporate structures to the ultimate beneficial owners. Nominee companies, trusts, and partnerships are all examined.

Who is NOT subject to the Lex Koller?

• Swiss citizens, regardless of where they live
• C permit holders (settled foreign residents) — for their primary residence only
• B permit holders — for their primary residence only, subject to cantonal approval in some cases
• Foreign nationals domiciled in Switzerland — for their primary residence

Which properties are subject to the Lex Koller?

The Lex Koller does not apply to all real estate equally. Here's what falls under its scope:

Second homes and holiday apartments

This is the primary target of the law. Any residential property that is not the buyer's primary residence is subject to the Lex Koller. This includes holiday chalets in Zermatt, lakeside apartments in Montreux, and ski-in/ski-out condos in St. Moritz.

Building land designated for residential use

Vacant plots zoned for residential construction are covered. A foreign buyer who wants to build a house in Switzerland needs authorization before purchasing the land.

Vacant housing not used as a primary residence

Even a standard apartment or house is subject to the Lex Koller if the foreign buyer does not intend to live in it as their main home. An empty flat in Geneva bought by a Parisian investor falls under the law.

What is NOT covered?

• Commercial property — offices, retail, industrial buildings are exempt
• Agricultural land — covered by separate legislation (LFA)
• Primary residence purchases by residents — a C permit holder buying their own home is exempt
• Properties in certain tourist zones — though heavily regulated (see exceptions below)

Exceptions and exemptions

Not every sale to a foreigner requires authorization. The law provides several important exemptions:

Primary residence for residents

The biggest exemption: a foreign national with a B or C permit who is domiciled in Switzerland may purchase their primary residence without Lex Koller authorization. This is why most everyday property transactions in cities like Zurich, Geneva, or Basel are unaffected — the buyers are already Swiss residents.

C permit specifics

C permit holders (settled foreign residents) enjoy the broadest exemption: they can purchase their primary residence freely, and in some cantons, they face relaxed rules for second homes as well. However, cantonal law may impose additional conditions, so it's worth checking locally.

Tourist zones (Zones touristiques)

Certain communes — especially in Valais, Graubünden, and Ticino — have designated tourist zones where foreign purchases are permitted under quota systems. These zones were historically created to allow holiday home development, though the 2012 initiative against second homes (initiative Weber) has significantly restricted new construction in these areas.

Inheritance and forced sale

Properties acquired through inheritance or through forced sales (foreclosures, bankruptcy) are exempt from the Lex Koller, even if the beneficiary is a foreign national residing abroad.

Cantonal variations

Some cantons go beyond the federal minimum. Geneva, for example, applies particularly strict rules even within its borders. Others, like certain rural cantons, are more permissive within the tourist zone framework. Always verify with the local notary or cantonal authority.

Cantonal authorization procedure

When a sale falls under the Lex Koller, the foreign buyer must obtain cantonal authorization before the transaction can be finalized. Here's how the process works:

Step 1: Application submission

The buyer (or their notary) submits an application to the cantonal authority responsible for Lex Koller enforcement. Required documents typically include:

• Identity documents and residence status of the buyer
• Property details (location, type, surface area, purchase price)
• Proof that the property will serve as a primary residence (if applicable)
• Declaration of intent regarding use (holiday home, investment, etc.)
• Corporate structure details (if the buyer is a company)

Step 2: Cantonal review

The authority reviews the application against federal law and cantonal regulations. They check:

• Whether the buyer qualifies for an exemption
• Whether the property falls under the Lex Koller
• Whether the cantonal quota for foreign acquisitions has been reached
• Whether the purchase price is reasonable (not used to circumvent restrictions)

Step 3: Decision and timeline

The authority issues a decision — approval, conditional approval, or rejection.

Costs

Cantonal authorization is not free. Fees vary by canton but typically range from CHF 200 to CHF 2,000 for the application itself. In some cantons, additional fees apply for the review process. The buyer usually bears these costs, but they add to the overall transaction expense.

Lex Koller canton by canton

While the Lex Koller is a federal law, its enforcement and the additional cantonal restrictions vary significantly. Here's what sellers need to know in the most relevant cantons:

Geneva

Geneva is one of the strictest cantons. The territory is almost entirely outside designated tourist zones, meaning virtually all second-home purchases by foreigners require authorization — and are frequently denied. The cantonal quota is low, and the authority scrutinizes applications carefully. For sellers, this means that a foreign non-resident buyer faces a real risk of rejection, and the pool of eligible international buyers is very small.

Vaud

Vaud strikes a moderate balance. Certain communes in the Lake Geneva region (Montreux, Vevey) have tourist zones where foreign second-home purchases are possible under quota. However, outside these zones, the Lex Koller applies strictly. The authorization process in Vaud is generally well-organized, with decisions within 4 to 8 weeks.

Valais

Valais has the largest number of designated tourist zones in Switzerland — think Verbier, Zermatt, Crans-Montana, Saas-Fee. Foreign buyers can acquire holiday apartments in these zones under the quota system. This makes Valais one of the most attractive cantons for foreign buyers — and correspondingly important for sellers to understand the quota constraints. The canton typically grants around 200 authorizations per year, and high-demand communes can fill their allocation quickly.

Zurich

Zurich enforces the Lex Koller strictly but has relatively few second homes in foreign demand. Most foreign buyers in Zurich are already B or C permit holders purchasing their primary residence — exempt from the law. For non-resident foreign buyers, the authorization process is thorough, and second-home acquisitions are rarely approved outside of exceptional circumstances.

Graubünden

Graubünden is the heartland of Swiss holiday homes — St. Moritz, Davos, Arosa. The canton has extensive tourist zones and a well-established framework for foreign second-home purchases. However, the Weber initiative (2012) froze new second-home construction in communes where second homes already exceed 40% of the housing stock. This has made existing foreign-eligible properties even more valuable. Sellers in Graubünden should highlight Lex Koller eligibility — it's a genuine selling point.

Ticino

Ticino, like Valais and Graubünden, has significant tourist zones (Lugano area, Lake Maggiore) and attracts Italian-speaking foreign buyers, particularly from Italy. The cantonal authority processes Lex Koller applications relatively efficiently, and the quota system is well understood locally. However, the 2012 second-home freeze has also limited supply here.

Selling to a foreigner: impact on the Swiss seller

As a Swiss property owner, you might wonder: "Does it matter who I sell to?" The answer is yes — the Lex Koller creates tangible differences for sellers.

Price impact

In tourist zones (Valais, Graubünden, Ticino), properties eligible for foreign purchase often command a premium of 10–20% over comparable properties restricted to Swiss residents. Why? The buyer pool is global, and demand from wealthy international buyers drives prices up. Conversely, outside tourist zones, the Lex Koller restriction narrows the buyer pool, which can slightly depress prices.

Timeline impact

Authorization adds 1 to 3 months to the transaction timeline. The notary cannot finalize the sale until cantonal approval is granted. During this period, the property remains in limbo — and the seller is typically locked into the agreement. Include a suspensive condition (condition suspensive) in the preliminary contract so you're not bound if the authorization is denied.

Taxation

Selling to a foreigner does not change the capital gains tax you owe. The tax is calculated on the gain regardless of the buyer's nationality. However, there are two nuances:

• Higher sale price = higher capital gains tax — if the foreign buyer premium pushes the price up, your tax bill increases accordingly.
• Withholding tax (impôt anticipé) — if the seller is also a foreign resident, Switzerland may withhold tax on the sale proceeds. Swiss residents are not affected.

Negotiation dynamics

Foreign buyers — especially high-net-worth individuals from outside the EU — may be less familiar with Swiss property law. They may assume that buying property in Switzerland works like in their home country. As a seller, make sure your notary explains the Lex Koller process early, so expectations are aligned and the deal doesn't collapse at the authorization stage.

5 mistakes to avoid when selling to a foreigner

1. Not mentioning the Lex Koller in your listing. If you're marketing your property internationally, be transparent about whether the buyer will need authorization. This avoids wasted time and builds trust with serious buyers.
2. Signing a preliminary contract without a suspensive condition. Without a clause making the sale conditional on Lex Koller authorization, you could be legally bound to a deal that cannot close. Always include this condition.
3. Assuming all foreign buyers face the same rules. An EU national with a B permit buying their primary residence is exempt. A non-resident buying a holiday home is not. The buyer's residence status determines the applicable rules — not their passport.
4. Ignoring cantonal quotas and timelines. Some cantons fill their annual quota quickly. In peak seasons (spring and autumn), authorization in Valais or Graubünden can take longer. Start the process early.
5. Overlooking corporate structures as a workaround. Some buyers propose purchasing through a Swiss-registered company. While this is legal in certain cases, the Lex Koller looks through corporate structures to the beneficial owner. If the company is foreign-controlled, authorization is still required — and attempts to circumvent the law can lead to the transaction being voided.

Frequently asked questions