Buying a home in Switzerland: test affordability before you search
An affordable asking price is not enough. Lenders examine your equity, future costs and cash reserves.
Updated 30 September 2026Financing begins with the property valuation
People planning to buy a home usually look first at the advertised purchase price. The lender also checks the property's lending value. If the bank's market valuation is below the agreed price, the difference cannot simply be financed through the usual mortgage. More equity may be required, or the price may have to be renegotiated. An early valuation protects against a surprise financing gap shortly before signing. It belongs alongside a review of location, condition, maintenance needs and potential developments in the neighbourhood.
A home also creates long-term expenditure. Before accepting an offer, include not just the price but also purchase charges under cantonal rules, possible financing costs, moving costs and a repair reserve in the liquidity plan. The nature and amount of transaction charges vary with the canton and the purchase. A budget can satisfy a formal equity percentage and still create stress in the first year when a roof, heating system or façade needs attention.
Swiss banks work with minimum industry standards and their own credit policies. FINMA recognises the sector's self-regulation as a minimum standard and emphasises that institutions may impose stricter requirements for particular risks. An online calculator is therefore an orientation aid, not a mortgage commitment. It should reveal the questions to resolve before meeting a lender: what is the home worth, which funds are truly available, how dependable is income, and what continuing expenditure will arise? A sustainable plan combines all of them rather than treating the purchase price as the only relevant figure.
Equity and the part that cannot come from pillar 2
For an owner-occupied home, a plan with approximately 20 percent equity is a common starting point. Under recognised minimum requirements, at least 10 percent of the lending value must come from sources other than a withdrawal or pledge of occupational pension assets. This portion is often called hard equity. Depending on the evidence, it can include savings or other freely available assets. Whether and how pillar 3a assets can be used should be assessed separately. The actual lender will review the source, availability and risks of every amount.
Consider an illustrative property whose purchase price and lending value are both CHF 1,000,000. The buyers contribute CHF 200,000 in equity and borrow CHF 800,000. At least CHF 100,000 of the equity must not derive from the occupational pension scheme. Taking pension-fund money can affect retirement, disability and survivors' protection. Pledging the money is not a risk-free alternative merely because it is not withdrawn; it changes the financial structure and must remain affordable. A pillar 3a withdrawal likewise has pension and tax consequences.
Collect evidence of equity early: savings statements, investment account values, gift documents, loan agreements and pension statements. A private family loan does not automatically count as equity; its repayment and interest commitments may weaken affordability. Preserve an accessible reserve after the purchase. Using every available franc as the deposit can force expensive short-term borrowing when an unforeseen repair appears. The best equity contribution is therefore not automatically the entire account balance. It should be sufficient for the lender while leaving the household resilient.
A waterfall from price to first and second mortgage
A clear financing illustration starts on the left with one full bar for the property price. Equity is subtracted next. The amount still to be financed is then divided into a first and, where applicable, second mortgage. In a common model, the first mortgage covers financing up to two thirds of the lending value, and the second is the portion above that level within the total permitted mortgage. This is a calculation framework. The lender determines the contractual division and product mix according to its rules and the property.
For a CHF 1,000,000 lending value with CHF 200,000 equity, the illustrative mortgage is CHF 800,000. Approximately CHF 666,667 lies within the two-thirds level, and about CHF 133,333 lies above it. A useful diagram displays the price as the starting bar, then downward steps for equity, the second-mortgage portion and finally the first-mortgage portion. The steps show how much remains after each funding source. They are not extra charges added to the price.
The portion above two thirds matters for the amortisation plan. Recognised minimum standards generally require the mortgage to be reduced to two thirds of the lending value within no more than 15 years. A nearer retirement date may lead to stricter terms. For CHF 133,333 in the example, equal repayments over 15 years imply about CHF 8,889 annually. This is an illustrative planning amount rather than a binding lending offer. A good calculator makes the waterfall and the annual repayment visible together so buyers see how the financing is constructed over time.
Affordability is a stress test
Affordability asks whether a household could continue paying housing costs if interest rates and circumstances change. Banks often use an imputed interest rate well above a currently available mortgage quotation. Maintenance, ancillary property costs and required amortisation are added. In a fact sheet FINMA describes an example of sustainable assessment using a five percent imputed interest rate, costs of 0.8 percent of lending value for a nearly new property and a limit up to 38 percent of net income. That is a supervisory illustration, not a commitment by every lender. Individual institutions use their own criteria and examine the actual case.
Many simple calculators use roughly one third of gross household income as an easy-to-understand guide. It is not a statutory pass-or-fail line either. Income quality, property, wealth, liabilities and lender policy can change the assessment. A result between 33 and 40 percent can signal a need for careful advice: above the guideline but potentially feasible with suitable structuring. Above that range a calculator should warn clearly. It must not promise that a bank will finance a purchase at any particular colour or bar position.
For your own stress test, record recurring commitments such as maintenance payments, consumer loans and major planned spending alongside income. Test the position after retirement separately. A loan that looks comfortable for two full-time earners today may look different after reduced working hours. Good affordability is more than one percentage: it includes reserves, the reliability of income and the capacity to absorb unexpected change.
Worked example: a one-million-franc home
Assume both purchase price and bank lending value are CHF 1,000,000. The household supplies CHF 200,000 in equity, at least CHF 100,000 of which does not come from the occupational pension fund. The mortgage is CHF 800,000. For a simplified stress test, use five percent imputed interest on the mortgage: CHF 40,000 a year. Assume, illustratively, maintenance and ancillary costs equal to one percent of property value: CHF 10,000. Reducing the amount above two thirds over 15 years calls for around CHF 8,889 per year. Together, these figures produce annual imputed housing costs of about CHF 58,889.
With gross household income of CHF 180,000, that is around 32.7 percent of gross income. At CHF 150,000, the same housing costs reach approximately 39.3 percent. The example explains why a CHF 30,000 income difference changes the position in a calculator even though price and equity stay unchanged. A bank may use net income, assume different maintenance costs or count only part of a variable bonus. The percentages cannot therefore be transferred unchanged to every institution.
Suppose the bank values the property at CHF 950,000 instead. Its lending base has changed, and the gap to the agreed price may require additional equity. An expected CHF 80,000 renovation likewise changes the liquidity plan even if the bank is willing to finance the purchase. A useful calculator separates purchase price, equity, debt, repayment, imputed annual burden and reserve. A single green figure would hide too much for a commitment lasting many years.
Assess income from several sources
The composition of income is central to mortgage financing. Permanent salary, bonuses, self-employment earnings, part-time work, multiple employers and rental income differ in stability and documentation. Banks normally assess more than a number typed into an annual-income field. For a self-employed person, several sets of accounts, current orders and fluctuations may be relevant. For a bonus, the lender may ask how regularly it has been paid and how much depends on company results. In a two-income household, potential parental leave or reduced working hours belongs in the family's own stress test.
Prepare an income schedule showing fixed salary, recurring variable elements, self-employed profit, other income and existing obligations. Mark each number as confirmed, recurring or uncertain. This makes offers from different lenders easier to compare. A higher nominal annual total is not necessarily stronger if much of it is one-off. Conversely, a sound self-employed business with well-documented years may be financeable even though a simple online calculator cannot describe it properly.
Create a second household scenario with lower earnings. What happens after six months of lost work, a separation or retirement? Risk insurance or a sufficient reserve can help protect the family. These questions do not automatically disqualify a purchase. They identify which structure and cover suit the household before a binding contract is signed. A lender's approval and the family's own comfort are related but distinct judgments: both deserve attention.
Compare direct and indirect amortisation
Direct amortisation reduces mortgage principal through regular repayments. The outstanding balance falls and, if the rate stays unchanged, interest costs tend to decline over time. Under indirect amortisation, the earmarked amounts are first paid into a pledged pension arrangement, typically pillar 3a. The mortgage remains higher for the time being and is repaid later using those pension assets. The approaches affect liquidity, interest expense, pensions, investment risk and tax differently. A fair comparison must show the full picture, not just an immediate deduction.
An indirect arrangement can be appropriate if pillar 3a eligibility exists and the pension strategy fits. But pillar 3a payments are legally capped and the assets are not freely accessible. Investment holdings can fluctuate. Anyone comparing mortgage interest with expected investment return should account for fees, risk and the planned repayment date. A pension-fund purchase is a different instrument with its own rules; it does not automatically replace the duty to reduce the mortgage portion above two thirds on time.
Prepare a multi-year cash-flow schedule for both options: interest, principal payments or pension contributions, tax effects and remaining debt. Remember that imputed-rental-value taxation ends from 2029 and many property-related deductions change at the same time. A strategy justified only by the present ability to deduct mortgage interest therefore needs careful review. The decision belongs in the customer's overall mortgage strategy and should be coordinated with retirement planning and risk tolerance. If expected investment returns are used, label them as assumptions rather than guaranteed offsets to debt cost.
SARON, fixed-rate and targeted mortgage offers
A SARON mortgage follows a short-term Swiss money-market benchmark. The Swiss National Bank describes SARON as a secured overnight interest rate and a benchmark for money-market mortgages. For borrowers, such a product broadly means interest costs can change over time. A fixed-rate mortgage agrees an interest rate for a defined term and makes interest payments easier to budget. In exchange, leaving before the term ends can be costly or restricted. Either product can support a sound financing plan, depending on a household's appetite for certainty, liquidity and time horizon.
Lenders also market targeted mortgage offers. Depending on the provider, these may include starter, family or energy-related mortgages. Those names are not standard statutory product categories. Conditions, discounts and terms differ and may change. An energy offer may require particular improvements or standards; a family offer may depend on household circumstances. Compare the overall effect rather than only an introductory discount. In particular, examine what happens when a concession expires.
The appropriate combination emerges from a mortgage strategy: how much interest-rate certainty does the household need? How much flexibility will matter for a sale, renovation or retirement? Should the debt be divided into tranches or kept in one product? How do direct or indirect amortisation and pension provision fit together? The answer follows a real life plan. Recommending only today's cheapest rate ignores the years during which the mortgage must continue to fit the family and the property. Ask lenders to show costs under both stable and higher-rate scenarios.
Plan sustainability and future renovation
A property can be ready to occupy now yet require substantial investment within a few years. Review the roof, building envelope, heating, windows, services and common areas in a condominium. An energy assessment, maintenance plan, owners' meeting minutes and quotations from specialists can make the future need concrete. Sustainability in financing is more than a label. High energy use or old heating can raise operating costs and investment needs; an appropriate renovation can reduce running costs and improve comfort.
Separate work by urgency, cost and tax treatment. Zurich's tax administration distinguishes value-preserving from value-enhancing expenditure; mixed projects may have to be split. Energy-saving measures can follow special rules. Invoices and descriptions of the condition before and after work matter. A project does not automatically qualify for a full income-tax deduction merely because it is environmentally beneficial. Check subsidies too, because they alter the amount personally borne.
On 1 January 2029, imputed rental value on owner-occupied property ends. At the same time, the maintenance-cost deduction for owner-occupied homes generally disappears; cantonal rules for energy investments may remain relevant for a limited period. Anyone purchasing in 2026 and considering a major renovation for 2028 or 2029 should include the legal change in timing decisions. Tax effects are only one part of the decision. Safety, preserving the property and paying for essential work are more fundamental. Obtain professional cost estimates before treating a potential tax deduction as a source of finance.
Checks before accepting a binding offer
First obtain a realistic market valuation and assess the technical condition of the property. Compare the bank's lending value with the asking price. Then document equity and its source, particularly the part outside occupational pension assets. Budget for transaction costs and preserve a cash reserve. Organise income into fixed salary, self-employment and other sources, and add existing commitments. Test affordability using imputed interest, maintenance and amortisation, including a less favourable income scenario.
Amortisation needs a definite plan: direct repayments, indirect payments through pillar 3a or coordination with other pension steps. Ask for the remaining debt and pension consequences under each route. Develop a renovation plan: what investment will the property need, how will it be funded and which tax rules apply in the year of the work? Finally decide which interest-rate structure fits the planning horizon. SARON, fixed-rate and targeted products can each perform a different role.
Only then does comparing interest rates make sense. Two banks may offer apparently similar rates while assuming different values, income or repayment schedules. Ask each for an understandable statement of its assumptions. This reveals whether a cheaper quotation truly covers the same financing. A B or C residence permit is not a line item in this financial-affordability checklist. Legal eligibility to acquire a particular property is a separate question that should be addressed with the appropriate authority and not hidden inside a mortgage calculator.
Common questions on home financing
Are 20 percent equity always enough? No. A bank value below the purchase price, a special property or stricter lender policy can demand more. A reserve for transaction costs and repairs should remain. Does affordability of 34 percent automatically mean rejection? No. One third of gross income is a common guide in simple examples, not a statutory decision line. The bank uses its own criteria and evaluates the quality of income, assets and property. Higher burdens call for more careful structuring and risk analysis.
Must the second mortgage disappear in 15 years? Recognised minimum standards generally require the total mortgage to be reduced to two thirds of the lending value within that period. In everyday language, the portion above two thirds is called the second mortgage. Individual contracts and retirement plans can produce tighter deadlines. Can all equity come from pension-fund money? No. At least 10 percent of lending value must come from sources other than a withdrawal or pledge of pillar 2 assets.
What should a mortgage calculator display? Purchase price, lending value, equity, first and second mortgage, imputed interest, maintenance, amortisation and the resulting income ratio. It should disclose its assumptions and update figures immediately when an input changes. This helps with an initial conversation but does not replace the lender's binding assessment. Plan refinancing before a fixed term ends: examine notice periods, likely future income, possible sale and the maturity dates of multiple tranches. Compare flexibility and charges as well as the quoted rate. Write down the scenarios and review them after a material change in life circumstances.
This information is general. Your documents, contracts and the relevant authorities determine what applies to your situation.