Swiss property taxation: optimisation strategies

For Geneva owners in particular, understanding the subtleties of cantonal taxation can generate substantial savings while securing their investments over the long term.

At Millenium Properties, more than 15 years of experience working with property owners has allowed us to develop specialist expertise in property taxation. Without replacing the personalised advice of a tax specialist, this article offers an overview of the main tax mechanisms and the optimisation strategies available to owners, with a particular focus on the Geneva context.

Understanding the basics of property taxation in Switzerland

The Swiss tax system is organised on three levels: federal, cantonal and communal. This federal structure leads to significant variations in property taxation between cantons, while certain fundamental principles are shared.

Tax on rental income

In Switzerland, two types of property income are subject to income tax:

Actual rental income

When a property is let, the rent received is taxable income at federal, cantonal and communal level. According to the Federal Tax Administration (AFC), this income must be declared in full, but may be reduced by deductible property expenses:

• Mortgage interest
• Maintenance and renovation costs
• Co-ownership charges
• Insurance premiums relating to the property
• Administration costs for rental properties

In Geneva, the marginal tax rate can reach up to 44.75% (combined federal, cantonal and communal rates) for the highest incomes, hence the importance of rigorously optimising deductible expenses.

The imputed rental value of the main residence

A sometimes little-known Swiss specificity: Switzerland taxes owners who occupy their own home on a “notional income” called imputed rental value. In theory, this represents the rent the owner would have received had they let the property at market price.

In practice, this imputed rental value is generally set at around 60-70% of the actual market rental value. According to the 2024 tax statistics of the canton of Geneva, this taxation represents on average CHF 12’000 to 18’000 of annual taxable income for a standard 4-room flat.

It should be noted that this system is the subject of recurring debate at federal level, with several reform projects aiming to abolish it partially or entirely, in exchange for limits on tax deductions.

Taxation of property capital gains

When a property is sold, the capital gain realised (the difference between the sale price and the purchase price plus value-adding investments) is subject to property gains tax.

Monist or dualist taxation system

Depending on the canton, two systems coexist in Switzerland:

• Monist system (majority): the capital gain is taxed separately from other income by a specific property gains tax
• Dualist system (minority): the capital gain is taxed differently depending on whether it results from the sale of a property forming part of private assets (special tax) or business assets (ordinary income tax)

The canton of Geneva applies a monist system, with a sliding scale based on the length of ownership. According to the Geneva law on registration duties (LDE), rates range from 50% for less than 2 years to 30% after 5 years, then continue to decrease gradually to a floor rate of 10% after 25 years of ownership.

Special cases and tax deferrals

Certain situations allow a tax deferral, in particular:

• Reinvestment in a property for personal use (main residence)
• Transfer between spouses on divorce
• Inheritance or gift (with the heirs taking over the tax values)

According to the Geneva cantonal tax administration, the reinvestment mechanism allows around 35% of sellers to defer their tax, a significant opportunity for owners wishing to reinvest in a new property for personal use.

Legal tax optimisation strategies

Proactive tax management can significantly reduce the tax burden associated with a property portfolio. Here are the main legal strategies available to you.

Permitted tax deductions

Optimising deductions is the first lever for reducing the property tax burden.

Maintenance costs: flat rate vs actual costs

For each tax period, the owner can choose between two methods of deducting maintenance costs:

• Flat-rate deduction: 10% of gross yield for buildings under 10 years old, 20% beyond that
• Deduction of actual costs: on presentation of supporting documents

The optimal strategy generally consists of grouping maintenance work into certain tax years so as to significantly exceed the flat rate and opt for actual costs in those years, then reverting to the flat rate in years with little or no work.

According to our analyses at Millenium Properties, this planning can generate an average tax saving of 15-25% on maintenance costs over the long term.

Energy-saving work

Investments aimed at saving energy or protecting the environment receive preferential tax treatment, as they are considered deductible maintenance costs even if they add value to the property.

This work includes in particular:

• Installation of solar panels
• Replacement of heating systems
• Thermal insulation
• Replacement of windows with high energy-performance glazing

In Geneva, these investments may also qualify for cantonal subsidies through the Énergie programme, creating a double financial advantage.

Administration costs and insurance

For rental properties, remember to deduct all administrative costs:

• Property management fees (generally 3-5% of rents)
• Letting costs
• Legal costs relating to rental management
• Insurance premiums (ECA, owner’s liability, legal protection)

Estate planning

The transfer of a property portfolio deserves particular attention in terms of tax planning.

Gift vs inheritance

The tax treatment of property transfers varies between cantons:

• In Geneva, inheritance tax in the direct line (parents-children) has been abolished, but property gifts remain subject to a registration duty of 1.8% to 3% depending on the family relationship
• Other cantons, such as Vaud, tax both inheritances and gifts

A detailed analysis of the family and asset situation makes it possible to optimise the timing and terms of the transfer to minimise the tax impact.

Usufruct and bare ownership

Splitting ownership into usufruct and bare ownership is an effective strategy to:

• Transfer a property portfolio gradually
• Retain income for the donor (usufructuary)
• Reduce the tax base of the transfer

According to Geneva tax scales, the value of the usufruct ranges from 70% to 20% of full ownership depending on the usufructuary’s age (from 50 to 90), directly affecting the amount of duties payable on the transfer of bare ownership.

Property company vs direct ownership

For large property portfolios, structuring through a property company can offer significant tax and estate advantages:

• Easier transfer by selling shares rather than buildings
• Possibility of gifts spread over time
• Greater asset protection

However, this option involves structural costs and more complex management, requiring case-by-case analysis.

Focus on Geneva taxation

The canton of Geneva has several tax specificities that directly influence property owners’ optimisation strategies.

Property gains tax (IBGI)

Property gains tax (IBGI) is one of the main taxes to plan for when selling a property in Geneva. It applies to the difference between the sale price and the purchase price, after deduction of certain expenses relating to the improvement and preservation of the property.

A rate that decreases with the length of ownership. The longer you keep your property, the lower the rate applied to the gain:

• less than 2 years: 50% of the gain;
• from 2 years: 40%;
• from 4 years: 30%;
• from 6 years: 20%;
• from 8 years: 15%;
• from 10 years: 10%;
• from 25 years: 2% (since 1 January 2025).

There is therefore no longer a full exemption after 25 years: the rate is simply reduced to 2%.

Possible deductions. Acquisition costs, sale costs and renovation or extension work that adds value may be taken into account in calculating the taxable gain.

Transfer duties and annual taxes

Transfer duties. Transfer duties are charges levied by the State when a property is transferred. In Geneva, they amount to 3% of the sale price. They are in principle payable by the buyer, but a split with the seller may be agreed during negotiation.

The owner’s annual taxes. Geneva has no “property tax” in the French sense of the term. The owner is subject to wealth tax (on the tax value of the property), income tax (rental income, or imputed rental value if they occupy the property themselves) and the supplementary property tax (IIC). It is essential to be up to date with these taxes before a sale, to avoid any blockage.

Tax deferrals and reductions on sale

Tax deferral on reinvestment. If you sell your main residence and reinvest the proceeds in the purchase or construction of a new main home in Switzerland, you can obtain a deferral of IBGI. The reinvestment must in principle take place within two years before or after the sale. This is a deferral and not a definitive exemption: the tax can be deferred onto the replacement property, in particular if it remains your main residence.

Reduction based on length of ownership. As mentioned above, the rate decreases over time. Since 2025, ownership of 25 years or more entitles you to a reduced rate of 2%, not an exemption.

Selling a property in Geneva as a non-resident

Non-residents of Switzerland are also subject to IBGI when they sell a property located in Geneva. Switzerland in principle retains the right to tax income, wealth and gains relating to real estate located on its territory.

Where a double taxation agreement exists between Switzerland and your country of residence, it generally provides that the taxation of property income and gains falls to Switzerland. Depending on the rules of your country, a local declaration may nevertheless still be required, with a mechanism to avoid double taxation. We recommend that you consult a tax expert.

How to declare the sale of your property

On sale, the transaction must be declared to the tax authorities. The declaration includes the sale price, expenses relating to the property and, where applicable, the tax deferral requested.

Documents to gather:

• the notarised sale contract;
• invoices for renovation or improvement work;
• supporting documents for acquisition and sale costs;
• information on any mortgage debts and taxes relating to the property.

A complete and accurate declaration helps avoid penalties and subsequent tax audits.

Cantonal specificities

Supplementary property tax (IIC)

Specific to Geneva, the IIC is an annual tax of 0.1% of the tax value of the building, with no deduction for mortgage debts. It is reduced to 0.02% when the building is the owner’s main residence.

Example: for a flat with a tax value of 1 million francs, the IIC amounts to CHF 1,000 per year, or CHF 200 if it is the main residence.

Taxation of non-residents

Non-resident owners of a property located in Geneva are subject to specific taxation:

• taxation in Switzerland of property income and wealth located in Geneva;
• taking into account the rental income or imputed rental value of the property;
• application of Geneva tax rules and, where applicable, international agreements.

This specificity can weigh significantly on the return on an investment in Geneva.

Reassessment of tax values

The Geneva tax administration periodically reassesses the tax values of buildings. Since 1 January 2025, the law on the tax valuation of certain buildings (LEFI) provides for a 12% increase in the tax value of certain villas and PPE (condominium) flats for the 2025 tax period, following an initial increase of 7% for certain buildings. This change has a direct effect on wealth tax and on the IIC.

Specific tax advantages

The Geneva tax shield

Geneva protects taxpayers against excessive taxation through the “tax shield”. For people domiciled in Switzerland, total cantonal and communal taxes on income and wealth may not exceed 60% of net taxable income. The calculation includes a minimum yield of 1% of net wealth, and excludes in particular the IIC and direct federal tax.

For owners whose wealth is mainly in property, with a limited yield, this mechanism can offer significant protection, subject to the applicable conditions.

The expatriate regime

Certain foreign executives settling in Geneva may, under strict conditions, benefit from expenditure-based taxation, commonly known as the “lump-sum tax”. This regime concerns only a limited category of taxpayers and is not an automatic advantage linked to expatriate status. An individual analysis is essential before any acquisition strategy.

Incentives for energy renovation

The canton offers tax incentives and subsidies for energy renovations:

• tax deduction for certain energy improvement work, where it is considered a maintenance cost;
• direct subsidies which can reach, depending on the measures and conditions, up to 50% of the cost of the work concerned;
• exemption from the IIC for 20 years for buildings with high or very high energy performance (HPE or THPE).

According to the cantonal energy office (OCEN), subsidies must be applied for before work begins, and their amount depends on the project, the measures carried out and the scale in force.

Conclusion

Swiss property taxation, and Geneva’s even more so, is complex, but it also offers many legal optimisation possibilities. A planned approach allows owners to reduce their tax burden while enhancing the value of their assets over the long term.

Recent developments, such as stronger incentives for energy renovation, the increase in certain tax values since 2025 and discussions on reforming the taxation of imputed rental value, highlight the importance of regular monitoring and a tailored tax strategy.

At Millenium Properties, more than 15 years of expertise in the Geneva market allow us to support owners with an overall view of their assets, in which taxation is an essential component of long-term returns. We do not replace specialist tax advisers, but our knowledge of the market enables us to guide our clients towards the property solutions best suited to their tax situation.

A successful property strategy in Geneva requires thorough tax consideration, ideally carried out ahead of each important decision: acquisition, renovation, letting or sale. For personalised support, please contact our advisers.