Swiss house/apartment dossier: documents for your mortgage

Buying an apartment or a house in Switzerland with a mortgage means providing the lender with a sometimes surprising number of documents. Payslips, tax return, debt enforcement register extract, proof of equity, plans, land register extract, condominium ownership regulations… The list can make it seem as though the bank wants to know what is in your drawers too.

In practice, your Swiss apartment dossier must allow the lender to answer two different questions: can you sustainably afford the requested mortgage, and does the property provide sufficient real-estate security?

These checks are not incidental. FINMA supervises how institutions assess affordability and property values. For owner-occupied housing, it cites as a sustainable practice, among other things, a calculation based on a theoretical interest rate of 5% and, for a new building, theoretical ancillary costs of 0.8% of the lending value. These figures are used to stress-test the financing and do not necessarily correspond to the mortgage rate actually offered.

A well-prepared Swiss apartment dossier is therefore not intended to “keep the bank happy”. It should make your situation understandable, verifiable and defensible to the department that will make the credit decision.

Why does the lender ask for so many documents?

A mortgage dossier actually contains two dossiers: To understand the logic behind the documents required for a mortgage, divide your application into two parts.

The first concerns the borrower: income, assets, equity, debts, financial commitments, and family and professional circumstances.

The second concerns the property provided as security: price, location, floor area, condition, rights entered in the land register, construction characteristics and, for a condominium, the situation of the co-ownership.

Your Swiss apartment dossier must connect these two sets of information.

The bank checks in particular:

• your identity and place of residence;
• the stability and sustainability of the income taken into account;
• the origin and availability of your equity;
• your loans, leases, maintenance payments and other long-term commitments;
• the value of the home it is prepared to finance;
• the property’s legal status;
• any works that may affect its value;
• the household’s ability to afford the financing over the long term.

A distinction must also be made between regulatory rules and a bank’s internal rules. There is no single nationwide list of documents that all lenders are required to request in exactly the same way. Prudential standards set a minimum framework, but institutions retain their own credit policies.

Since 1 January 2025, the revised Swiss Bankers Association guidelines connected with the implementation of Basel III Final have applied. Among other things, they provide for a minimum equity contribution of 10% meeting the requirements of the guidelines and amortisation of the debt to two-thirds of the lending value within 15 years. A bank remains free to apply more restrictive criteria depending on the risk.

This is precisely why two lenders may request slightly different documents for the same mortgage application dossier.

When and how should you prepare your Swiss apartment dossier?

Do not start only after you have already signed a purchase offer: The wrong time to start looking for your pension fund certificate (2nd pillar) is when the seller requires confirmation of financing within five days.

The best approach is to assemble your dossier before you have even chosen the property.

First prepare a permanent dossier containing information about the buyers:

• identity documents;
• residence permit where required;
• proof of income;
• latest tax return;
• statement of assets;
• bank assets;
• pension assets that may be used;
• existing loans and commitments;
• origin of the equity.

Once you find a property, simply add the documents relating to the property itself.

This organisation turns a dossier for buying an apartment into a reusable tool. You can present it quickly to several lenders without rebuilding your financial situation for each application.

Another tip is rarely mentioned: create three digital subfolders entitled Buyer, Building and Transaction. Give the files explicit names, for example:

“BUYER_Certificat-Salaire-2025-Dupont.pdf” rather than "scan0047.pdf“. You can prefix the other documents, for example, with “BUILDING_Energy-Certificate.pdf” and “TRANS_Contract-Xxxxxx.pdf”.

This may seem minor, but when your mortgage broker has to send a mortgage application dossier containing dozens of files quickly to different institutions, this discipline helps avoid mistakes.

Also check the dates. Some documents quickly lose their relevance. In general, a debt enforcement register extract and a land register extract less than 3 months old are recommended.

Personal documents: demonstrating affordability

For an employee

The documents required for a mortgage depend on the lender, but an employee should generally prepare:

• identity card or passport;
• residence permit, if applicable;
• recent payslips or salary certificates;
• annual salary certificate;
• latest tax return and, depending on the lender, tax assessment;
• recent debt enforcement register extract;
• statements for accounts used as equity;
• pension fund statement if the 2nd pillar is involved in the transaction;
• statements for pillar 3a used for the financing or indirect amortisation;
• proof of a gift or advance inheritance;
• leasing agreements, personal loans and other long-term commitments;
• proof of maintenance payments paid or received where they affect affordability.

Above all, your dossier should be consistent.

Try our free online mortgage calculator to get a broad overview of your mortgage.

Suppose you state that you have CHF 180’000.– in equity. If CHF 70’000.– is held in a bank account, CHF 60’000.– comes from pillar 3a and CHF 50’000.– from a family gift, the lender must be able to follow this breakdown without having to reconstruct it.

A large amount that has recently appeared in an account may therefore lead to an additional request concerning its origin. Providing the corresponding evidence proactively can avoid another round of questions.

For a self-employed person, business owner or legal entity

The documents for a self-employed person generally require a longer historical view.

Documents often required include the annual accounts, balance sheets and profit and loss statements for the last three years, an extract from the commercial register, the latest tax return and, for a public limited company (AG/SA), the audit reports for the last three years.

It may also be useful to add:

• provisional accounts for the current financial year;
• a recent interim financial statement;
• the remuneration actually paid to the company director;
• dividends received;
• shareholder loans;
• an explanation of an exceptionally good or bad financial year;
• the order book or significant contracts where the company is young.

The lender’s reasoning differs from that of the entrepreneur. An accounting profit of CHF 200’000.– does not automatically mean that CHF 200’000.– constitutes sustainable personal income.

For a business owner, the mortgage dossier for a Swiss apartment must therefore explain how the company’s performance actually translates into income available to the buyer.

If the buyer is itself a legal entity, the financing criteria change significantly. The rules for an owner-occupied primary residence held privately should not simply be carried over.

Property documents: what the lender wants to understand before financing it

Existing apartment or house

The documents most commonly used when buying an apartment include:

• sales dossier or brochure;
• asking price and terms of sale;
• plans;
• living area;
• year of construction;
• works and renovations already completed;
• cadastral plan or site plan;
• recent extract from the land register ;
• interior and exterior photographs;
• existing valuation, if available;
• information on the heating system and energy condition;
• GEAK/CECB, Minergie or another certification where available;
• building insurance certificate where relevant;
• building-right agreement if the property is built on land owned by a third party.

These documents allow the bank to carry out its own assessment.

This is a fundamental point in your document dossier: the price you agree to pay does not oblige the bank to use the same value for its financing.

Take an apartment purchased for CHF 850’000.–. Suppose a lender estimates its lending value at CHF 820’000.– and, in this particular case, agrees to finance 80% of that value.

The maximum mortgage would then be:

CHF 820’000.– × 80% = CHF 656’000.–

The buyer would therefore need to contribute at least:

CHF 850’000.– – CHF 656’000.– = CHF 194’000.–

to which acquisition costs not financed by the mortgage may still need to be added.

Your apartment purchase dossier therefore indirectly affects the amount of equity required: if the available information leads the lender to use a value below the purchase price, the required down payment increases.

Additional documents for a condominium

For an apartment held as condominium ownership, do not limit yourself to the plan of your unit.

Complete your dossier with:

• the deed establishing the condominium ownership;
• the unit’s value quota or ownership share;
• the administration and use regulations;
• the amount available in the renovation fund;
• the latest co-ownership accounts;
• the current budget;
• recent minutes of co-owners’ meetings;
• information on works that have been approved or are being considered.

The last three items are excellent bonus documents.

Imagine two perfectly identical apartments. In the first condominium, the renovation fund contains CHF 600’000.–. In the second, it contains CHF 40’000.– even though the roof, lift and façades need to be renovated.

For both the buyer and the lender, the future financial risk is clearly not the same.

Reading the meeting minutes can therefore reveal an expense that appears neither in the photographs nor in the sales description.

Additional documents for a plot of land

A plot of land generally requires:

• land register extract;
• cadastral plan;
• exact plot area;
• zoning designation;
• applicable building regulations;
• extract from the cadastre of public-law restrictions on landownership, where useful;
• information on access and servicing of the plot;
• easements;
• rights of way;
• any land charges;
• construction project, if one already exists.

A mortgage dossier for undeveloped land is often assessed differently from financing for a completed home. The value of the land, the future project and the way the construction will be financed then form a single whole.

New construction or major conversion

For a construction project or substantial renovation, add in particular:

• building permit;
• project plans;
• detailed construction specification;
• cost estimates;
• contract with the general contractor or main contractors;
• construction schedule;
• payment schedule;
• construction budget;
• contingency reserve;
• proof of ownership of the land;
• contracts with architects and other professionals where required.

The building permit, plans, construction specification and cost estimate can expressly be included among the additional documents for a construction or renovation project.

For the lender, the question is no longer only “how much is the apartment or house worth?”, but also how much will the property actually cost when it is completed?

A CHF 80’000.– cost overrun with no available financial reserve can turn a comfortable project on paper into problematic financing.

Documents provided by the notary

As the transaction progresses, your Swiss apartment dossier is supplemented with documents relating to the notarised deed and the creation of security.

Depending on the canton and the stage of the purchase, the office responsible for executing the deed may prepare or transmit, among other things:

• the draft purchase deed;
• the final notarised deed;
• instructions for payment of the purchase price;
• documents intended for entry in the land register;
• documents relating to the creation, transfer or increase of a mortgage certificate.

The mortgage certificate constitutes security provided to the lender. You should therefore not confuse the loan agreement, the purchase deed and the mortgage security: three mechanisms are involved in the same acquisition, but they serve different purposes.

What does the bank actually check in your Swiss apartment dossier?

Income, equity, affordability and property value

A good dossier for a Swiss apartment must pass several checks at the same time.

The lender first examines the source and stability of the income. A fixed salary received for several years is generally easier to assess than remuneration consisting of a low fixed salary and a fluctuating bonus.

It then checks the equity: amount, origin, availability and eligibility.

Next comes affordability. The lender does not necessarily rely only on the mortgage rate offered at the time of purchase. FINMA presents calculations using a theoretical rate of 5% as a benchmark for sustainable financing of owner-occupied housing. It also cites a limit of 33% of sustainable gross income for transactions outside internal policy, with theoretical ancillary costs of 0.8% for a new building. Each institution nevertheless retains its own credit rules.

Finally, it analyses the property itself.

This process explains why documents for a mortgage can sometimes seem repetitive. The same document can be used for several checks.

The tax return can confirm income, but also assets and certain debts. A bank statement establishes the existence of equity while also helping to trace its origin. The land register confirms the property while revealing certain rights or charges.

“Bonus” documents that can strengthen the dossier

Some documents will not be required systematically, but can make a Swiss apartment dossier easier to understand:

• employer confirmation that a probationary period has ended;
• a new employment contract already signed;
• documented explanation of a recent salary increase;
• evidence of bonuses regularly received over several years;
• written evidence of a gift;
• an independent property valuation already available;
• invoices for major renovations;
• GEAK/CECB or other energy-related documents;
• recent condominium accounts and meeting minutes;
• cost estimates for works planned immediately after the purchase.

But “more documents” does not mean “a better dossier”.

One hundred unorganised pages are less useful than thirty pages that answer the lender’s questions exactly.

The role of the mortgage broker in your region is precisely to determine which supporting documents to present, to which lender and in what form, and to prevent a perfectly explainable particularity from being interpreted as an inconsistency.

Dossier checklist, administrative costs and mistakes to avoid

The checklist before submitting a financing application

Before submitting your Swiss apartment dossier, check the following in order:

• identity of all borrowers;
• documented income;
• available tax information;
• identified financial commitments;
• equity documented back to its origin;
• pension provision documented if it is involved in the financing;
• complete sales brochure;
• available plans;
• recent land register extract;
• condominium documentation where the property is an apartment;
• information on renovations;
• permits and cost estimates for a construction project;
• identical purchase price in all documents;
• consistent names, addresses and amounts;
• dated and legible documents.

This final check genuinely deserves your full attention.

A mortgage dossier showing CHF 890’000.– in the application, CHF 875’000.– in the draft contract and CHF 900’000.– in the calculation file will inevitably trigger a question.

A small inconsistency does not mean that the financing will be refused. It simply means that someone will have to stop and understand it.

What costs should you expect for mortgage documents?

Not all documents are free.

Depending on the canton, municipality, authority and transaction, costs may arise in particular for:

• the debt enforcement register extract;
• certain land register extracts;
• certified copies;
• specific cadastral documents;
• the creation or amendment of a mortgage certificate;
• notarised deeds;
• entries in the land register;
• certain property valuations.

It would be misleading to give a single Swiss tariff: fees and costs associated with a property purchase vary in particular according to the canton and the nature of the transaction.

A distinction must also be made between the few francs or tens of francs spent on an administrative extract and the much higher costs that may accompany the notarised deed, land register or creation of mortgage security.

In your purchase budget, therefore set aside a separate category for transaction costs and do not assume that the advertised price of the apartment alone represents the amount required to become the owner.

FAQ – Documents for a mortgage in Switzerland

A well-prepared dossier can save valuable time

The best dossier for a Swiss apartment is not the one containing the most PDFs. It is the one in which the lender quickly finds the answers to the questions it needs to resolve.

Who is borrowing? With what income? With what equity? To buy what? At what price? What value can be used? What commitments already exist? And will the financing remain affordable if conditions become less favourable?

When these answers are clear, the process becomes smoother.

Conversely, waiting until the last minute, submitting incomplete documents or approaching several banks one after another without understanding their criteria can waste significant time precisely when the seller is expecting a quick decision.

Are you preparing a purchase and would like your document dossier checked before applying for a mortgage? A preliminary review with a mortgage broker makes it possible to check the documents, identify points that may raise questions and present your application to lenders that genuinely match your situation.

This also allows you to compare the proposed terms on the same basis rather than comparing simulations based on different dossiers.

Request an assessment of your borrowing capacity or a consultation with a mortgage expert before submitting your financing application.

Request an assessment of your borrowing capacity or a consultation with a mortgage expert before submitting your financing application.

Disclaimer: this guide provides general information on preparing a mortgage dossier in Switzerland. Requirements vary according to the lender, type of property, canton and the borrower’s personal circumstances. The numerical examples are illustrative and do not constitute a financing offer or individual legal, tax or financial advice.

Sources used: Swiss Bankers Association, revised mortgage self-regulation in connection with Basel III Final. FINMA, The mortgage market at the centre of FINMA supervision, June 2025.