What Eigenmietwert is and why it exists
Eigenmietwert is a Swiss tax concept that treats owner-occupied homes as if they generate rental income. Instead of paying rent to a landlord, a homeowner is considered to receive a virtual rental income — the amount they could theoretically charge for their property on the open market.
This imputed income is added to the homeowner's taxable income each year. The rationale is fairness: someone who owns a home free of mortgage payments has more disposable income than a tenant paying market rent. The Eigenmietwert ensures that home ownership does not create an untaxed advantage.
For decades, Swiss homeowners have both declared this notional income and deducted actual costs: mortgage interest, property maintenance, and renovation expenses. In many cases, especially with a high mortgage and regular upkeep, the deductions have exceeded the imputed income — making Eigenmietwert an effective tax break rather than a burden.
For expats, this system can be unfamiliar. Most countries do not tax imaginary rental income from owner-occupied homes. The Swiss wealth tax guide covers the parallel issue of how property affects your asset tax position.
The reform timeline: 2029 with transition from 2026
The Swiss Federal Assembly passed the systemic change to home ownership taxation. The Federal Department of Finance describes the reform as abolishing the Eigenmietwert tax for owner-occupied primary residences at the federal and cantonal levels.
The reform takes full effect from 2029. The years 2026 to 2028 serve as a transition period. During this window, homeowners can adjust their mortgage structure, plan maintenance spending, and prepare for the new tax landscape.
Specifically, the reform also removes the corresponding tax deductions. Once Eigenmietwert disappears, homeowners can no longer deduct mortgage interest or routine maintenance costs against their taxable income. This is the key trade-off: you stop paying tax on phantom income, but you also lose the ability to reduce your real tax bill through mortgage and maintenance expenses.
For expats, the transition timing is especially relevant. If you are planning to buy, sell, or refinance a Swiss property in the next three years, this shift changes the tax maths. A decision that made sense under the old system may look different when mortgage interest is no longer deductible.
Who wins and who loses from the reform
The clearest winners are homeowners with low or no mortgage debt. These owners have been paying tax on imputed rental income but have had little or no mortgage interest to offset it. Under the new system, that notional income disappears, and they have no meaningful deduction to lose — a net tax reduction.
The clearest losers are owners with high mortgages and high maintenance costs. These homeowners have been deducting significant mortgage interest and renovation expenses, often offsetting or exceeding the Eigenmietwert addition. When the reform removes both the imputed income and the deductions, their taxable income could increase because they lose the real deductions without the notional income to offset them.
Owners with a typical mortgage of 60-70% of property value and normal maintenance spending fall somewhere in the middle. The net effect depends on the specific loan-to-value ratio, interest rate, canton, and maintenance cycle. A rough rule of thumb is that owners with mortgages above 65% LTV may see a tax increase, while those with lower leverage benefit.
For expats, the calculus also depends on whether you are taxed at source or under ordinary assessment, your marginal tax rate, and your long-term plans in Switzerland. The Pillar 3a home ownership withdrawal guide covers scenarios where you might combine a property purchase with pension withdrawals.
What to do during the 2026-2028 transition
First, review your mortgage structure now. If you plan to amortise your mortgage, the next three years are the window when interest payments still generate a tax deduction. Accelerating amortisation during the transition period means paying down debt that is currently reducing your taxable income — while that benefit still exists.
Second, plan maintenance and renovation spending strategically. Under the current system, maintenance costs are fully deductible and renovation costs that increase property value are also deductible if they serve energy efficiency or preservation purposes. If you have a major renovation planned, executing it before 2029 means you can still deduct the expense. After 2029, that deduction disappears.
Third, run a tax estimate for 2029 onward. Use your current income, mortgage details, canton, municipality, and expected maintenance costs under the new rules. Compare this with your current tax position. The Swiss tax return documents guide shows the paperwork needed for a complete estimate.
If you are considering buying a Swiss property, especially as an expat, add the reform timeline to your decision model. A purchase now means you get three years with mortgage deductibility. A purchase in 2030 has no interest deduction at all. This changes the effective cost of ownership.
If you are thinking of selling a Swiss property, the new system may affect market pricing. Buyers will value the tax treatment differently after 2029, which could influence demand for high-leverage properties. The Exit Switzerland checklist is relevant if the sale is part of a broader departure plan.
Cantonal differences and second homes
The reform applies to federal direct tax and requires cantons to harmonise. However, cantons have some flexibility in how they adapt their cantonal tax laws. High-tax cantons such as Geneva and Vaud may adjust differently than low-tax cantons such as Zug and Schwyz.
Second homes and investment properties are not covered by the reform. If you own a holiday home or a rental investment property in Switzerland, the Eigenmietwert rules continue to apply. The reform is explicitly limited to owner-occupied primary residences.
For expats who own both a Swiss primary residence and a property abroad, the new rules are only relevant to the Swiss property. The foreign property continues to be treated under the relevant double taxation agreement and Swiss rules for declaring foreign assets.
Cantonal tax offices are expected to publish updated guidance during 2026-2027. The Federal Tax Administration's ICTax tool and cantonal calculators should incorporate the new rules as the implementation deadline approaches. Always verify the final rules with your canton before making large financial decisions based on the expected abolition.