What budget do you need to buy a house in Switzerland?
- Your real budget: three limits to calculate before viewings
- Equity: 20% does not always mean 20% of the purchase price
- Affordability: the bank test that often sets the limit
- Purchase costs and safety buffer: money not to put into the down payment
- Detached house: turn future work into an annual budget
- Three worked examples to determine your maximum price
- Frequently asked questions about budgeting for a house purchase
The budget for buying a house in Switzerland is not the maximum amount your savings allow you to put down, nor the price a calculator shows after you enter your income. Your true ceiling is the lowest of three figures: the price your equity can support, the price your affordability can support, and the price the bank is willing to finance based on its own valuation of the property.
This distinction matters because a CHF 1,000,000 house may be financeable for one household and impossible for another with the same income. The condition of the building, the bank valuation, the source of the equity, existing debts, planned work and cantonal purchase costs can change the result by tens or even hundreds of thousands of francs.
The aim of this guide is therefore to help you build a purchase budget you can actually use before viewings, and to know exactly what still needs to be validated once you find a specific house.
Your real budget: three limits to calculate before viewings
To avoid looking at houses you ultimately cannot finance, do not start from a single “maximum budget”. Calculate three separate limits.
1. The limit set by your equity
The first limit depends on how much money you can genuinely commit without exhausting all your reserves. For an owner-occupied main residence, many lenders finance up to around 80% of the accepted value. This is why people often speak of 20% equity, but that formula is incomplete: a minimum share must come from sources other than the second pillar, and any gap between the purchase price and the bank valuation must also be financed from your own resources.
2. The limit set by your income
The second limit comes from affordability. A bank does not simply ask whether you can pay today’s interest rate. It checks whether your household could still carry the mortgage in a much more demanding scenario by adding an imputed interest rate, amortisation and maintenance costs.
3. The limit set by the bank value of the house
The third limit is only known after the property has been assessed. If you agree to pay CHF 1,100,000 for a house that your bank values at CHF 1,020,000, it will not necessarily lend 80% of CHF 1,100,000. The price you agree to pay and the amount the bank accepts as collateral (mortgage lending value) are two different figures.
Your search budget should therefore be set using the first two limits, and every house you seriously consider should pass the third test before you make an irrevocable offer.
Equity: 20% does not always mean 20% of the purchase price
The Swiss Bankers Association guidelines recognised by FINMA as a minimum standard require at least 10% of the mortgage lending value to come from equity that does not originate from the second pillar. They also require any gap between a higher purchase price and a lower mortgage lending value to be financed entirely with equity outside the second pillar.
Possible sources can include savings, securities, pledged pillar 3a assets, certain insurance policies, gifts, advances on inheritance or, subject to conditions, family loans. The second pillar can supplement the structure for a main residence, but it therefore cannot replace the entire required equity contribution.
Example: CHF 1,050,000 purchase price, CHF 1,000,000 bank value
Assume the bank is willing to finance 80% of its value, or CHF 800,000. You therefore need to contribute CHF 250,000 to pay the CHF 1,050,000 purchase price.
- On the CHF 1,000,000 bank value, at least CHF 100,000 must come from equity outside the second pillar.
- The CHF 50,000 gap between the price paid and the bank value must also be financed outside the second pillar.
- In this example, at least CHF 150,000 must therefore come from equity other than the second pillar.
- Purchase costs still have to be financed on top.
This is one reason why saying “I have 20% of the purchase price” is not always enough to conclude that your budget is secure.
Affordability: the bank test that often sets the limit
FINMA reminds banks that affordability must be assessed on a sustainable basis. As an example of sustainable criteria for an owner-occupied home, it cites a limit of 33% of sustainable gross income, an imputed mortgage rate of 5%, and theoretical property costs of 0.8% of the mortgage lending value for a new property. FINMA also makes clear that these are examples of criteria, not a single formula imposed on every bank.
Each lender may therefore use more conservative assumptions, particularly for an older house, variable income or a case that falls outside its standard criteria. The key point is that the affordability test is not based on the mortgage rate you see advertised today.
Full example for a house valued at CHF 1,000,000
Take a house with a bank value of CHF 1,000,000 and a CHF 800,000 mortgage. Using the stress-test example cited by FINMA:
- imputed interest at 5% on CHF 800,000: CHF 40,000 per year;
- theoretical property costs at 0.8% of CHF 1,000,000: CHF 8,000 per year;
- amortisation: under the banking minimum standard, the debt must be reduced to two thirds of the mortgage lending value within a maximum of 15 years.
Reducing the mortgage from CHF 800,000 to about CHF 666,667 means amortising roughly CHF 133,333. Spread over 15 years, that is approximately CHF 8,889 per year. The total theoretical annual cost therefore comes to around CHF 56,889.
With a limit of 33% of sustainable gross income, this scenario corresponds to gross income of approximately CHF 172,400 per year. This estimate is not a loan promise; it shows why a mortgage that appears affordable at current rates can still fail the bank’s affordability test.
Use our mortgage calculator for an initial estimate, then compare the result with the actual criteria used by the lender reviewing your application.
The income the bank counts is not always the same as your taxable income
A fixed, recurring salary is generally straightforward to document. Bonuses, commissions, dividends, self-employed income, rental income or foreign income may be counted only in part or averaged over several years. Leasing commitments, personal loans, maintenance payments and other recurring obligations, on the other hand, reduce your room for manoeuvre.
For a couple, also check whether both incomes are considered sustainable over the relevant period. A planned career change, a reduction in working hours or an approaching retirement can materially change the amount you can finance.
Purchase costs and safety buffer: money not to put into the down payment
The house price and your equity are not the full amount of cash you need. Depending on the canton, purchase costs may include transfer taxes, notary fees, land-register fees and costs linked to the mortgage certificate.
These costs vary significantly from canton to canton, so using a single Swiss percentage is risky. For a specific property, ask the notary for an estimate that reflects the municipality, purchase price, any existing mortgage certificate and the financing structure.
Your post-completion reserve is part of the budget
A detached house concentrates expenses that do not always arise with a newer apartment: boiler or heat pump, roof, drainage, façade, windows, electrical installation, garden, retaining wall, utility connections, access road or wastewater works. If the purchase uses all your liquidity, a major failure six months after completion can become a financing problem.
I therefore recommend separating three pots: equity for the purchase price, purchase costs, and a post-purchase reserve. The third may not be part of the bank’s formula, but it determines how resilient your budget really is.
Detached house: turn future work into an annual budget
For a house, the most useful figure is not simply “1% of maintenance costs per year”. Costs are uneven. A more precise approach is to build a replacement plan for major components and annualise the likely expenditure.
Example of a renovation reserve
Suppose a house is likely to need, over the next eight years, CHF 45,000 for heating and part of the building services, CHF 35,000 for some windows and CHF 40,000 for the roof or building envelope. The identified work exposure totals CHF 120,000.
Spread over eight years, that is the equivalent of CHF 15,000 per year to set aside. You will obviously not spend it evenly, but the figure lets you compare this house honestly with a more expensive property that has recently been renovated.
The bank will not automatically finance all your renovation work
If you buy an existing house and plan CHF 150,000 of renovation work, do not assume the initial mortgage will automatically increase by CHF 150,000. The bank reviews quotes, the post-renovation value, the nature of the work and sometimes the construction schedule. Some maintenance or comfort improvements do not add value equal to their cost.
Your budget should therefore separate the price paid to the seller, essential work, optional improvements and a contingency reserve. This prevents you from overbidding on the purchase price on the assumption that the bank will finance everything else later.
Three worked examples to determine your maximum price
Scenario A: plenty of savings, income is the constraint
A household has CHF 300,000 available but wants to keep CHF 50,000 after the purchase. It can therefore allocate at most CHF 250,000 to the down payment and costs. On paper, the equity could support a property priced above CHF 1 million. But if sustainable income supports only a mortgage of around CHF 650,000 under the lender’s affordability test, affordability sets the maximum price, not the amount of savings available.
Scenario B: high income, equity is the constraint
A couple earns CHF 230,000 gross per year but has CHF 170,000 of usable equity, excluding purchase costs. Their income could support substantial debt, but the down payment limits the affordable price. The second pillar may be able to supplement the structure for a main residence, while still respecting the minimum share required outside the second pillar and taking the impact on retirement provision into account.
Scenario C: the property itself becomes the constraint
A household has the necessary income and CHF 280,000 of liquidity to buy a house for CHF 1,100,000. The bank, however, accepts a value of only CHF 1,000,000. At 80% loan-to-value, it lends CHF 800,000. The buyer therefore needs CHF 300,000 before purchase costs: the project becomes impossible despite theoretically sufficient borrowing capacity, unless the buyer increases the equity contribution or obtains a different valuation from another lender.
The formula to keep in mind before every viewing
Your maximum price is not an official banking formula, but you can think of it this way: maximum search price = the lower of the equity-based limit and the affordability-based limit. Then, for each house, add a third check: the bank’s valuation of the property.
Finally, deduct from your available cash what you need to keep for purchase costs, immediate work and your safety reserve. This final step is often what turns a theoretical budget into one you can genuinely sustain.
Bear in mind the tax change already decided for 2029
In 2026, the current imputed rental value system is still in force. However, the reform approved in the federal vote in September 2025 will take effect on 1 January 2029. The imputed rental value of owner-occupied homes will then be abolished, and tax deductions, particularly those linked to mortgage interest and maintenance, will change substantially.
If you buy today with an investment horizon of ten or twenty years, your long-term budget should therefore not assume that today’s tax rules will remain unchanged throughout the holding period. The reform may in particular change the tax rationale for keeping a high mortgage balance.
Frequently asked questions about budgeting for a house purchase
Do you have to provide 20% equity to buy a house?
Bank financing of up to around 80% of the accepted value is common, which often results in an equity requirement of about 20%. However, the banking minimum standard requires at least 10% of the mortgage lending value to come from sources other than the second pillar. A bank may also impose stricter requirements.
Does the bank calculate the mortgage on the purchase price?
Not necessarily. The lender determines its own mortgage lending value. If that value is below the price paid, the difference must be financed with equity and can substantially increase the amount of cash required.
What income do you need for a CHF 1 million house?
There is no universal income threshold. With a CHF 800,000 mortgage, a 5% imputed interest rate, theoretical property costs of 0.8% of the property value and the required amortisation, one example produces gross annual income of about CHF 172,400 at a 33% limit. Each lender nevertheless applies its own criteria.
How much should you keep in reserve after the purchase?
There is no single regulatory amount. For a house, the reserve should reflect the stability of your income and the technical expenditure you have identified: heating, roof, windows, drainage, façade, equipment and foreseeable work. The aim is not to lock all your liquidity into the down payment.
Are notary and land-registry costs included in the 20%?
No. They need to be budgeted separately. The amount depends in particular on the canton, municipality, purchase price, land registry and mortgage certificate. Ask the notary for an estimate before deciding on the maximum down payment you can make.
Can the second pillar be used to buy a house?
Yes. For your owner-occupied main residence, and subject to occupational-pension rules, second-pillar assets can be withdrawn or pledged. The banking minimum standard still requires part of the equity to come from other sources, and a withdrawal reduces your pension capital.
Has the imputed rental value already been abolished?
No. The current system still applies in 2026. The reform of home-ownership taxation will take effect on 1 January 2029, abolishing the imputed rental value for owner-occupied homes and substantially changing the related tax deductions.
To buy with a safety margin, prepare your project in this order: calculate the equity you genuinely have available, test affordability, reserve the purchase costs and post-purchase liquidity, then have the specific house validated by the lender before making a final commitment.
You can send us your situation to compare the budget different lenders may actually accept and prepare your financing before the decisive viewings.
Disclaimer: This article is provided for information purposes only. Financing criteria, valuation methods, tax rules, equity requirements and amortisation conditions may change or vary by lender and property. Check the conditions applicable to your case with your financial institution, notary and the relevant authorities before making any commitment.
