Mortgages for the Self-Employed: How Banks Calculate Your Income

Anyone running their own business who wants to buy property runs into an affordability calculation that works differently from a regular employment contract with a Lohnausweis (salary certificate). Fluctuating profits, balance-sheet items with valuation latitude and the absence of an occupational pension fund make the income proof more complex. The following sections show what yardsticks Swiss banks apply and how applicants can deliberately improve their starting position.

How banks determine income

The most important figure is the sustainably achievable pre-tax profit. Banks generally rely on the average of the past three financial years, though some institutions use two. The multi-year average is meant to smooth outliers in both directions. A record result in the most recent year cannot be claimed at face value; the smoothed average counts.

For a sole proprietorship (Einzelfirma), the reported net profit from the income statement flows in, adjusted for expenses unrelated to operations and private withdrawals. For legal entities such as a GmbH or AG, the managing director's salary, any dividends and a share of retained earnings count, provided they appear sustainable. Special dividends, one-off releases of hidden reserves and capital gains are usually excluded.

Documents banks want to see

In a standard case, mortgage lenders require three audited annual financial statements with balance sheet, income statement and notes. They also want the last three tax assessments, a current debt collection register extract (Betreibungsregisterauszug), business account statements and, for legal entities, an up-to-date commercial register extract.

Anyone who cannot yet provide three full financial years has a noticeably harder time. Some institutions accept provisional statements or interim audits but then demand higher equity or a guarantee. In the first two years of self-employment, a mortgage without a co-borrower with a fixed salary is rarely realistic.

Affordability under the calculatory logic

The affordability calculation (Tragbarkeit) follows the same calculatory assumptions for the self-employed as for salaried applicants. Banks apply a long-term average interest rate of 4.5 to 5.0 percent, add 1.0 percent for maintenance and ancillary costs and include the ongoing amortization on the loan-to-value above two thirds. The resulting cost burden may not exceed roughly one third of the recognised income.

The crux lies in the denominator. When the bank uses a three-year average instead of the latest peak, affordability often shifts down by ten to twenty percent. Self-employed buyers should therefore run their own numbers before viewing a property and assess realistically what purchase price level is actually financeable.

Loan-to-value and equity

The loan-to-value (Belehnung) is also often set more conservatively for the self-employed. While salaried applicants regularly receive 80 percent financing, some banks demand a higher equity ratio of 25 to 30 percent for volatile business models. As usual, at least ten percent of the purchase price must come from genuine own funds, not from second-pillar pension assets.

Sole proprietors who do not pay into a pension fund have no occupational pension assets in the classic sense. Säule 3a (the tied private pension pillar) therefore moves into focus. Self-employed individuals without BVG (occupational pension) affiliation may pay up to 20 percent of net income, capped at CHF 35,280 in 2026, into the tied pillar and later use these funds to acquire owner-occupied residential property.

Common pitfalls in the income statement

Banks scrutinise the income statement and apply various corrections. Private shares of business vehicles, high entertainment expenses, salaries to family members without a clear counter-performance or above-average pension fund buy-ins can reduce the recognised income. Unusually low managing-director salaries at legal entities are also adjusted upward when the bank suspects more income could be drawn.

On the asset side of the balance sheet, banks look at liquidity and the firm's equity ratio. High receivables, thin liquid funds and a weak equity base make a borrower look fragile. A clean, conservatively run balance sheet provides relief even when reported profits are moderate.

Practical tips for the mortgage search

Anyone planning a mortgage should start preparing at least 18 to 24 months before the intended purchase. Deliberate balance-sheet policy, restraint on excessive profit reduction in the years leading up to the application and a clear separation between business and private assets all matter. Aggressive past tax minimisation is paid back during the mortgage process in the form of a lower recognised income.

Comparing several providers also pays off. Cantonal banks, big banks, insurers and pension funds assess the self-employed differently. Insurers and pension funds are sometimes more conservative but more flexible on long terms and stable industries. Specialised mortgage brokers know the risk appetite of individual institutions and can place the application where the profile fits best.

Conclusion

The self-employed must reckon with higher hurdles, but they are by no means excluded from home ownership. Decisive factors are a complete file, income that is stable over several years and a conservative balance sheet. Those who plan early, understand the calculation logic of banks and consciously weigh tax optimisation against mortgage eligibility can achieve affordability without a salary certificate.