Key Takeaways
- • Swiss voters approved the abolition of imputed rental value (Eigenmietwert) taxation on September 28, 2025, with 57.7% support, eliminating a longstanding tax on the notional rental income of owner-occupied properties effective in tax year 2029.
- • Property owners will lose nearly all existing tax deductions including maintenance costs, energy-saving measures, and mortgage interest, fundamentally restructuring the tax treatment of residential real estate ownership in Switzerland.
- • Debt interest deductions face near-complete elimination with two limited exceptions: interest on first home purchase mortgages remains deductible for 10 years, and debt continues to reduce taxable net wealth for wealth tax purposes.
- • Cantons gain new authority to impose property taxes on second homes for personal use, creating potential additional tax liabilities for multi-property owners across Swiss jurisdictions.
- • The reform introduces a tax discrimination between owner-occupied real estate and other investment vehicles, as residential properties will no longer benefit from deduction-offsetting mechanisms while investment properties remain taxed conventionally.
Summary
On September 28, 2025, Swiss voters decisively approved the abolition of imputed rental value taxation, a cornerstone of the Swiss tax system for owner-occupied residential properties. The measure passed with 57.7% electoral support, marking a fundamental restructuring of how Switzerland taxes residential real estate. The change is set to take effect in tax year 2029, giving property owners approximately three years to adjust their financial planning before the new framework becomes operational.
Imputed rental value, known in German as Eigenmietwert, functioned as a complex taxation mechanism requiring homeowners to declare a notional rental value as taxable income—the amount they theoretically would pay to rent their property from themselves. This system has historically allowed property owners to offset this imputed income through substantial deductions on mortgage interest, maintenance costs, property repairs, and energy-efficiency improvements. According to Lombard Odier's analysis, the abolition of this system will eliminate nearly all existing deductions that homeowners have relied upon for tax planning. Samuel Meylan, Head of Tax and Legal Advice for Clients Resident in Switzerland at Lombard Odier, emphasizes that "almost all the deductions we have been entitled to are going to disappear," with property maintenance costs becoming non-deductible and energy-saving measures only partially deductible going forward.
The treatment of debt interest represents one of the most significant changes for property owners. Under the reformed system, mortgage interest deductions will virtually disappear entirely, regardless of whether the debt originates from mortgages, Lombard loans, family loans, or consumer credit. However, two targeted exceptions will remain: interest on mortgages used for the first purchase of a primary residence will continue to be deductible for a limited 10-year period, and debt will maintain its role in reducing taxable net wealth for wealth tax calculations. Despite these exceptions, homeowners should anticipate substantially higher annual tax liabilities once the system transitions to the new framework.
The reform simultaneously grants cantons new authority to impose property taxes on second homes designated for personal use, creating an additional revenue source for cantonal governments while potentially increasing overall real estate tax burdens for owners holding multiple residential properties. This decentralized approach means tax impacts will vary across Swiss jurisdictions based on individual cantonal decisions. The abolition introduces what critics characterize as discriminatory treatment, as owner-occupied residential real estate will no longer benefit from deduction mechanisms available under the previous system, while other investment asset classes remain governed by conventional tax structures. For institutional and sophisticated investors managing Swiss real estate portfolios, this marks a watershed moment requiring comprehensive tax strategy reassessment before the 2029 implementation date.
Imputed rental value, known in German as Eigenmietwert, functioned as a complex taxation mechanism requiring homeowners to declare a notional rental value as taxable income—the amount they theoretically would pay to rent their property from themselves. This system has historically allowed property owners to offset this imputed income through substantial deductions on mortgage interest, maintenance costs, property repairs, and energy-efficiency improvements. According to Lombard Odier's analysis, the abolition of this system will eliminate nearly all existing deductions that homeowners have relied upon for tax planning. Samuel Meylan, Head of Tax and Legal Advice for Clients Resident in Switzerland at Lombard Odier, emphasizes that "almost all the deductions we have been entitled to are going to disappear," with property maintenance costs becoming non-deductible and energy-saving measures only partially deductible going forward.
The treatment of debt interest represents one of the most significant changes for property owners. Under the reformed system, mortgage interest deductions will virtually disappear entirely, regardless of whether the debt originates from mortgages, Lombard loans, family loans, or consumer credit. However, two targeted exceptions will remain: interest on mortgages used for the first purchase of a primary residence will continue to be deductible for a limited 10-year period, and debt will maintain its role in reducing taxable net wealth for wealth tax calculations. Despite these exceptions, homeowners should anticipate substantially higher annual tax liabilities once the system transitions to the new framework.
The reform simultaneously grants cantons new authority to impose property taxes on second homes designated for personal use, creating an additional revenue source for cantonal governments while potentially increasing overall real estate tax burdens for owners holding multiple residential properties. This decentralized approach means tax impacts will vary across Swiss jurisdictions based on individual cantonal decisions. The abolition introduces what critics characterize as discriminatory treatment, as owner-occupied residential real estate will no longer benefit from deduction mechanisms available under the previous system, while other investment asset classes remain governed by conventional tax structures. For institutional and sophisticated investors managing Swiss real estate portfolios, this marks a watershed moment requiring comprehensive tax strategy reassessment before the 2029 implementation date.
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