Rental investment: buy an apartment to rent it out
- Understanding rental investment in Switzerland
- Calculate profitability before financing
- Buy with or without a mortgage
- Mortgage structure for an income property
- Taxation: what really changes the return
- Decide whether the property deserves to be bought
- Why use a mortgage broker
- A good rental investment is decided before the purchase
A rental investment in Switzerland is not just about buying a home, finding a tenant and collecting rent. The real issue is more precise: the property must generate sustainable rental income, cover its costs, remain financeable by a lender (bank, insurer or pension fund), and keep a sufficient margin after taxes, maintenance, vacancy and amortisation. This margin is what separates a simple buy-to-let purchase from a true income property.
In everyday language, rental investment covers several realities: people often speak of real estate investment, rental property investment, investing in bricks and mortar or property investment. In practice, the question remains the same: should you buy to rent, with or without a mortgage, and under what conditions can the project remain profitable? In Switzerland, the answer depends heavily on the purchase price, canton, tax profile, rent level, type of lender and mortgage structure.
The purpose of this guide is to give you a clear method for analysing a rental property project, avoiding overly optimistic calculations and understanding why support from a mortgage broker can improve the quality of the offers obtained. Good financing does not turn a bad property into a good deal. However, a well-structured mortgage can improve the return on equity, preserve liquidity and make a rental investment project more resilient to unexpected events.
Understanding rental investment in Switzerland
Simple definition: buying a property to rent it out
A rental investment consists of acquiring real estate intended to be rented out, fully or partly, in order to generate income. A rental investment may involve an apartment, a divided house, an entire building, commercial premises, a mixed-use property or a dwelling that is part of a broader wealth strategy. The buy-to-rent logic is therefore an income logic, not merely an ownership logic.
The difference from buying your main residence is clear. For a home you occupy, the bank first focuses on your personal income, your affordability and your equity. For an income property, the lender also analyses the property’s ability to produce regular results. In a rental investment, rent is not just a bonus: it becomes part of the financial demonstration.
A rental property investment must therefore be studied like a small business. The purchase price is the entry cost. Rents are turnover. Charges, interest, management fees, works and taxes reduce the result. Even a short vacancy can wipe out part of the annual return. The frequent mistake is to look only at the gross yield, meaning annual rent divided by the purchase price.
Possible forms of real estate investment
There are several ways to invest in real estate in Switzerland. For a first rental investment, the most direct option is to buy an apartment to rent it out. This option is straightforward, but it concentrates risk on a single tenant and a single condominium/PPE. One month without a tenant, an imposed renovation or an increase in condominium charges is felt immediately.
Buying a small building with several dwellings spreads risk better. If one apartment is empty, the other rents continue to come in. In return, the equity contribution is higher, management is more demanding and lenders analyse the file more professionally. This is the classic area of income property.
A mixed-use property, for example commercial ground floor premises with apartments above, can produce an attractive return, but it adds a specific risk: reletting commercial premises is sometimes slower than reletting a home. Rental property investment can also take the form of a second home rented out part of the year, but this model depends heavily on local rules, cantonal taxation, seasonality and rental restrictions.
Calculate profitability before financing
Gross yield, net yield and return on equity
To calculate the profitability of a rental investment and then validate it, three levels must be distinguished. In a rental investment, gross yield measures annual rent against the purchase price. It is quick, but too incomplete. Net yield deducts recurring costs: maintenance, insurance, management fees, non-recoverable charges, estimated vacancy and mortgage interest. Return on equity measures what your invested capital actually earns.
Simple example: a property bought for CHF 800,000 and rented for CHF 32,400 per year shows a gross yield of 4.05%. If maintenance costs reach CHF 8,000 per year, income before tax and before financing falls to CHF 24,400. Without a mortgage, this result must be compared with tied-up capital of around CHF 824,000 including indicative acquisition costs of 3%. The apparent return becomes around 2.96% before tax.
In a rental investment with a mortgage, the calculation changes. Interest reduces taxable income and available net income, but the personal contribution is lower. This is leverage: it can improve the return on equity, but it also increases sensitivity to rates, vacancies and works. A useful rental investment simulator must therefore always include charges, interest, amortisation and a safety margin, not just price and rent.
Use our mortgage calculator to simulate your real estate loan.
Costs that are often forgotten
A rental property purchase becomes fragile when the initial calculation ignores irregular costs. A boiler, facade, roof, windows or sanitary column is not paid for every year, but it is paid for sooner or later. Allowing 1% of the purchase price per year for maintenance is a prudent basis for an initial calculation, to be adjusted according to the building’s age and condition.
You must also take into account reletting costs, advertising, possible management fees, taxation of rental income, real estate wealth tax, PPE/condominium charges, insurance premiums and non-recoverable works. Rental investment is not passive income in the strict sense. Even with a property manager, the owner must decide, arbitrate and finance.
Buy with or without a mortgage
Scenario 1: purchase without a mortgage
In a rental investment, a debt-free purchase provides strong security. There is no interest to pay, no mortgage renewal, no risk of rising rates and no amortisation pressure. For an investor seeking to stabilise their wealth, investing in bricks and mortar without a mortgage can be coherent.
The drawback is the opportunity cost: all the capital is tied up in a single asset. If the property is worth CHF 800,000, the required contribution is very high. This choice can reduce diversification and limit the ability to finance other projects. It can also reduce tax deductions linked to interest, since there is no debt.
| Item | Scenario without a mortgage |
|---|---|
| Price | CHF 800,000 |
| Contribution | CHF 800,000 |
| Mortgage amount | CHF 0 |
| Acquisition costs (notary, transfer tax, land register, etc.) | CHF 24,000 (3%) |
| Annual debt interest | CHF 0 |
| Maintenance costs | CHF 8,000 per year (1%) |
| Annual rents used for the example | CHF 32,400 |
| Income before tax after maintenance | CHF 24,400 |
| Indicative tax deduction linked to the property | CHF 8,000 in maintenance costs, depending on applicable tax rules |
In this scenario, income is more stable, but the return on committed capital remains moderate. The owner can generally report tax-allowed maintenance costs in their tax return. Rental income is taxable and then reduced by authorised deductions. Exact amounts depend on the canton, the type of costs and the personal situation.
Scenario 2: purchase with a 60% mortgage
With a 60% mortgage, the investor finances CHF 480,000 with debt and contributes CHF 320,000 excluding acquisition costs. At 2% interest, annual interest reaches CHF 9,600. If direct amortisation is 3% per year of the borrowed amount, CHF 14,400 in annual repayment must be added. This amortisation reduces the debt, but it is not a tax-deductible expense.
| Item | Scenario with 60% mortgage |
|---|---|
| Price | CHF 800,000 |
| Contribution | CHF 320,000 |
| Mortgage amount | CHF 480,000 |
| Acquisition costs (notary, transfer tax, land register, etc.) | CHF 24,000 (3%) |
| Annual debt interest | CHF 9,600 |
| Maintenance costs | CHF 8,000 per year (1%) |
| Annual direct amortisation | CHF 14,400 (3% of CHF 480,000) |
| Annual rents used for the example | CHF 32,400 |
| Income before tax after maintenance and interest | CHF 14,800 |
| Cash flow after direct amortisation | CHF 400 |
| Indicative tax deduction linked to the property | CHF 17,600: interest CHF 9,600 + maintenance CHF 8,000, subject to applicable rules |
For a rental investment, the difference is significant. Without a mortgage, the example produces CHF 24,400 before tax after maintenance. With a mortgage, income before tax after maintenance and interest falls to CHF 14,800, but the tied-up equity is much lower. After direct amortisation, cash flow becomes almost neutral at CHF 400. This does not mean the transaction is bad: part of the rent repays the debt and gradually increases the net ownership share. But it shows that a rental investment can be profitable on paper and tight in cash flow.
These values are indicative and vary according to lenders, the borrower’s profile, cantonal taxation, the building’s age, sustainable rents and valuation rules. They do not constitute a financing offer or a rate promise.
Mortgage structure for an income property
Fixed rate, SARON, mix and term
To invest in rental real estate with a financed rental investment, the choice of rate must be linked to rent stability and your risk tolerance. A 10-year fixed-rate mortgage provides visibility: the cost of debt is known, which simplifies the return calculation. It may, however, become less advantageous if rates fall sharply.
A variable-rate SARON mortgage may be attractive when the investor accepts a variation in financing cost. It requires a larger liquidity reserve, because rental income does not automatically rise when interest rates increase. A mixed structure, for example one fixed part and one SARON part, can spread risk. In a rental property project, the goal is not to guess the best rate, but to avoid one renewal putting the entire profitability under pressure.
Submit your request now to receive financing proposals suited to this exceptional market.
Why lenders do not all calculate in the same way
Two lenders can look at the same income property and reach two different answers. Some value the property by market comparison, others by capitalising rents. Some retain current rents, others rents deemed sustainable. Some apply a high theoretical charge rate to test the file’s resilience, even if the negotiated rate is lower.
FINMA notes that, for income properties, affordability is assessed first on the basis of the result generated by the property and that banking self-regulation represents a minimum standard. In practice, banks, insurers and pension funds may tighten their own criteria. This is one reason why a mortgage broker can create value: they know which lenders are better suited to a rental property investment, an older property, a high loan-to-value ratio or atypical rental income.
Taxation: what really changes the return
Rental income, interest and maintenance
In Switzerland, income from renting a rental investment is in principle taxable. In return, the owner can deduct eligible costs, including maintenance costs and mortgage interest within the applicable limits. For a rental investment, taxation must therefore be integrated from the start. In a rental investment, an attractive pre-tax return can become average after tax if charges have been underestimated.
In the mortgage example, the amount that can indicatively be reported as a property-related deduction is CHF 17,600: CHF 9,600 in interest and CHF 8,000 in maintenance costs. Direct amortisation of CHF 14,400 is not deducted as an expense, because it repays the debt. It improves the wealth balance sheet but reduces available cash.
The federal reform accepted in the vote of September 28, 2025 provides for the abolition of taxation of imputed rental value on January 1, 2029. According to the FTA, the deduction of maintenance costs will be abolished for owner-occupied homes, but not for rented or leased homes. Passive interest will be subject to a new proportional limitation. For a buy-to-rent purchase, it will therefore remain necessary to distinguish owner-used property from rented property.
Canton, acquisition costs and real estate tax
Acquisition costs vary greatly by canton: transfer duties, land register fees, notary, mortgage note, bank fees and possible advisory fees. The 3% rate used in the tables is a working assumption. It may be too high in some cantons and too low in others, depending on the exact structure of the transaction.
Cantonal taxation also influences rental property investment: wealth tax, tax value of the property, standard or actual deductions, possible property tax, treatment of renovations and the owner’s tax bracket. An investor domiciled in one canton and owning property in another must look at intercantonal allocation. To invest in real estate properly, the canton where the property is located and the canton of tax residence must be analysed together.
Decide whether the property deserves to be bought
Questions to ask before making an offer
Before making an offer for a rental investment, an investor should require current rents, the rent roll, charges for the last three years, voted or foreseeable works, condominium/PPE minutes and the status of its renovation fund, insurance, major renovations already completed and rent levels compared with the local market. A rental investment should not be bought merely because it is available.
You must also test three adverse assumptions: a higher interest rate, an apartment vacant for three months and CHF 20,000 in unexpected works. If the project cannot withstand any of these situations, the price is probably too high or the contribution too low. Investing in rental property requires less optimism than discipline.
Mistakes to avoid
The first mistake is confusing gross yield with real profitability. The second is believing that all maintenance will be paid by tenants. The third is underestimating vacancy or reletting time. The fourth is financing too short an asset intended to be held for a long time. The fifth is neglecting mortgage renewal: a low rate today does not guarantee the same cost in five or ten years.
Another mistake is buying a fiscally or technically complex property without advice. An older property with heating to be replaced, a poorly insulated dwelling, a condominium/PPE with an insufficient renovation fund or vacant commercial premises can turn a rental investment into a source of negative cash flow. Investing in bricks and mortar remains tangible, but it is not automatically safe.
Why use a mortgage broker
Compare lenders instead of undergoing a single reading
A mortgage broker is not only used to look for a rate. Their role is to prepare the file, present the property correctly, identify compatible lenders and compare offers across their full structure: rate, term, amortisation, exit conditions, equity requirements, application fees, retained valuation and future flexibility.
For a real estate investment, this comparison is often more important than for a main residence. The same file may be refused by one lender and accepted by another with a different loan-to-value ratio. An experienced broker also knows how to avoid sending a poorly prepared file to too many institutions, which can harm negotiations.
Find all our mortgage brokers by region.
Turn a project into a financeable file
A good rental investment file presents the price, contribution, rents, charges, property condition, planned works, rate strategy, estimated taxation and a liquidity reserve. It does not promise an unrealistic return. It shows that the investor knows how to manage risk. This quality of preparation can speed up lender responses and improve terms.
If you are considering investing in rental real estate, the first useful step is not always a property visit. It is often an assessment of borrowing capacity and a return simulation with several debt levels. You will then know whether to target an apartment, a small building, a mixed-use property or wait until you strengthen your contribution.
A good rental investment is decided before the purchase
A successful rental investment is based on a coherent price, realistic rents, a sustainable mortgage, understood taxation and a reserve for unexpected events. Financing can improve the return on equity, but it can also weaken cash flow if amortisation, interest and works are poorly anticipated.
The right approach is to compare several scenarios: without debt, with moderate debt, with direct or indirect amortisation where possible, with fixed rate, SARON or a combination. The goal is not merely to obtain a mortgage, but to obtain a structure that protects your project over time.
Would you like to analyse a buy-to-let purchase, an income property or a future rental property investment in Switzerland? An assessment with a mortgage broker allows you to check your borrowing capacity, compare lenders and estimate net profitability before committing. For a rental investment, this step can prevent a costly mistake and bring you closer to a truly controlled decision.
Disclaimer: the figures are provided for illustrative purposes only. They do not replace a personalised analysis taking into account the canton, tax profile, property condition, sustainable rents, lender, mortgage terms and your wealth situation. Rates, lending rules, tax deductions and acquisition costs may change. No information in this article constitutes a financing offer, individual tax advice or a return guarantee.
Sources used: Federal Tax Administration FTA, reform of home ownership taxation and entry into force on January 1, 2029; ch.ch, taxation of real estate and deduction principles; FINMA, mortgage market file and supervision of risks related to income properties.
