Switzerland Mortgage Interest Tax Deduction Calculator

Switzerland allows full deduction of mortgage interest (Schuldzinsenabzug) from taxable income at both federal and cantonal/municipal levels — with no loan balance cap. The saving depends entirely on your combined marginal rate, which varies significantly by canton and income.

At median income in Zürich, the combined rate is ~27%. In Zug (low-tax canton), ~22%. In Geneva, ~33%. This makes Switzerland one of the most generous systems in Europe for higher earners with large mortgages.

Switzerland also applies Eigenmietwert (imputed rental value) — a notional rental income added to your taxable income for the home you own and occupy. This is typically 60–70% of comparable market rent and partially offsets the mortgage interest deduction.

Example: if your property's market rent equivalent is CHF 24,000/year, roughly CHF 15,000–17,000 is added to your taxable income — offsetting some of the deduction benefit. The calculator does not model the Eigenmietwert; consult a Swiss tax advisor for the full net picture.

The federal marginal rate tops out at 11.5%. Most of the deduction's value comes from the cantonal and municipal tax layer, which varies from ~10% in Zug to ~26% in Geneva. The calculator uses Zürich average combined rates.

• Zug: combined ~22% → CHF 100k interest → CHF 22,000 saving
• Zürich: combined ~27% → CHF 100k interest → CHF 27,000 saving
• Geneva: combined ~33% → CHF 100k interest → CHF 33,000 saving

Is there a loan balance cap?
No — unlike the US ($750,000 cap) or Japan (balance caps by housing type), Switzerland has no cap on deductible mortgage interest. The entire interest amount is deductible.

Is BeastyTax free?
Yes, completely free — no account, no hidden costs.