The notarised deed: why form is mandatory in Swiss property law

One might imagine that selling a property could be settled like a car purchase: two signatures, a bank transfer, done. Swiss law has decided otherwise. For a property to change hands, a notarised deed (authentic deed) must be executed before a notary — and this requirement is not an administrative formality inherited from the past. It protects all parties, including those who may not realise they need protecting.

If you are wondering why selling a property requires this particular procedure, here is what the authentic form actually does — and what it would cost you to overlook it.

What Swiss law says

The Swiss Civil Code is explicit: a contract for the sale of a property is valid only if it is executed in authentic form (art. 216 of the Swiss Code of Obligations). This means that a written agreement between two people — even signed before witnesses, even accompanied by a deposit — has no legal effect on the transfer of ownership. It creates no legally enforceable obligation. In other words, if one party changes their mind before the deed is signed, they may withdraw without the other being able to compel them through the ordinary rules of contract law.

This rule applies throughout Switzerland. What varies from one canton to another is how the notarial profession is organised: in the canton of Vaud, notaries practise as a regulated liberal profession under cantonal authority. A notary is a public officer, appointed by the State, authorised to draw up deeds that carry the force of proof.

What the deed accomplishes

The notarised deed is not merely a solemn signature. It fulfils several functions simultaneously that no other document can perform.

• It records the parties' intent. The notary reads the deed aloud, ensures that each party understands what they are signing, and records that intent in a document that stands as proof unless shown otherwise.
• It verifies identity and legal capacity. Selling or buying a property requires full legal capacity. The notary confirms this, particularly for persons under guardianship or for companies whose signatories must be duly authorised.
• It checks the title. Before drafting the deed, the notary consults the land register extract, identifies any easements, land charges or mortgages encumbering the property. These elements must be reflected in the deed or resolved before signing.
• It triggers registration in the land register. Only after registration does the buyer become the owner under Swiss law. The notarised deed is the indispensable condition for that registration.

For a closer look at the notary's precise role in a Vaud transaction, the chronicle The notary's role in a Vaud property sale details what this professional examines, verifies and guarantees throughout the process.

Fees and how they are split

In the canton of Vaud, the convention is clear: the costs associated with the notarised deed — the notary's fees, cantonal and communal property transfer duties, and land register charges — are borne by the buyer. The seller, for their part, pays the property gains tax (impôt sur les gains immobiliers), calculated on the difference between the sale price and the adjusted acquisition cost, and degressive according to the length of ownership.

For the buyer, it is reasonable to budget between 4% and 5% of the purchase price for all these costs combined. This is not a rule set in law, but an order of magnitude that Vaud notaries regularly confirm. Some items vary by commune — in particular the communal portion of the property transfer duties — which is why it is worth asking your notary for a detailed estimate before signing any preliminary agreement.

As for the property gains tax, it is the cantonal tax authority that calculates and fixes the amount. The notary does not calculate it themselves, but will ordinarily retain a portion of the sale price as security for its payment, in order to protect the buyer from a statutory mortgage that could encumber the property if the tax were left unpaid.

The preliminary agreement and its limits

Sometimes a seller and a buyer wish to commit to each other before executing the final deed — to allow time to arrange financing, obtain a permit, or satisfy a condition precedent. This is referred to as a preliminary sale agreement (promesse de vente).

Consider a typical case: a couple wishes to purchase a house in Lutry but is awaiting final confirmation from their bank. The seller agrees to wait three weeks. They are tempted to sign a private document to "hold" the property.

However, a preliminary agreement for the sale of a property must also comply with the authentic form in order to be legally binding. A simple written agreement, however detailed, obliges neither party to proceed with the sale. The one recognised exception concerns the preliminary sale of a PPE (condominium ownership) unit yet to be built, which is governed by specific rules. In all other cases, if you wish to bind yourself — and bind the other party — before the final deed, you must go before a notary.

This has a practical consequence: a deposit paid without a notarised deed is not forfeited if the sale does not proceed, but recovering it can lead to lengthy disputes. It is far better never to find yourself in that situation.

The timetable of a sale

Between an agreement in principle and the signing of the deed, you should allow for weeks, sometimes months. Here are the main stages that mark this period:

1. Agreement on price and terms. This is where the broker's work comes in: setting the right price, structuring the conditions, ensuring that both parties understand what they are committing to.
2. Verification of financing. The buyer's bank must confirm its credit offer. This is precisely what the Buyer Passport is for: attesting, on the basis of verified documents, that the financing is real before negotiations even begin.
3. Preparation of the deed. The notary — generally chosen by the buyer — examines the file: land register extract, mortgage situation, easements, civil status of the parties, powers of attorney if required.
4. Reading and signing. The notary reads the deed before the parties, answers any questions, and collects the signatures. Payment of the price takes place no later than at signing, usually by direct bank transfer.
5. Registration in the land register. The notary forwards the deed to the land register. Registration may take a few days to a few weeks, depending on the cantonal land register. It is at this point that the buyer officially becomes the owner.

The authentic form is not an obstacle to a sale: it is what makes a sale truly exist in the eyes of the law.

What you have just read describes the general process, applicable to the vast majority of residential sales in French-speaking Switzerland. Your situation may involve particular features — a property encumbered by a complex mortgage, a co-ownership, a seller based abroad, an estate — that alter certain aspects of the procedure or the timetable. If you are about to sign, or simply wish to understand what lies ahead, the Advisor can help you ask the right questions before going further.