Swiss Mortgage Guide 2026: Rules, Rates and Real Costs

Buying a home in Switzerland works differently from almost anywhere else. Mortgages are rarely paid off in full, affordability is tested at a rate far above the market, and the tax treatment of owning is about to change. This guide walks through the rules that decide what you can buy, what it costs each month, and what is shifting from 2029. Where a calculation helps, we link a free tool so you can put in your own numbers.

How much can you borrow?

Swiss lenders apply two tests, and your purchase has to pass both. The first is loan-to-value: a bank finances at most 80% of the property value, so you bring at least 20% as equity. The second is affordability, the rule most buyers underestimate.

The affordability test says your imputed annual housing cost must stay under a third (33%) of your gross income. Crucially, the interest is calculated at a calculatory rate of around 5%, not today’s low market rate, plus 1% of the price for maintenance and any amortization. You can check where you stand with our free affordability calculator.

This is why a home can feel affordable at today’s rates yet fail the bank’s test: the 5% figure is a deliberate stress test for the day rates rise again.

How much equity you need

The 20% minimum equity has a catch. At least half of it, 10% of the purchase price, must be hard equity: savings, a 3a account, a gift or an advance inheritance. The other 10% may come from your second-pillar pension fund.

• Hard equity (min 10% of price): cash savings, Pillar 3a, securities, gifts.
• Pension money (the remaining 10%): a withdrawal or pledge from your Pillar 2 fund.
• Using pension money reduces your retirement capital and insured benefits, so weigh it carefully.

First mortgage, second mortgage and amortization

Swiss mortgages are usually split in two. The first mortgage runs up to about 65% of the property value and does not have to be repaid. The second mortgage covers the band between 65% and 80%, and must be paid down to 65% within 15 years, or by retirement, whichever comes first.

That repayment, called amortization, comes in two flavours. Direct amortization pays the mortgage down each year, shrinking both the debt and the interest. Indirect amortization instead pays the same amount into a pledged Pillar 3a account; the mortgage stays put and the 3a balance eventually repays it. Which is better depends on your tax situation and what you would earn on the invested money, so it is worth discussing with your bank or advisor.

Fixed rate or SARON?

Once the structure is set, you choose how the interest is priced. A fixed-rate mortgage locks one rate for a set term, often two to ten years, giving certainty at a small premium. A SARON mortgage follows the money market: it charges the current reference rate plus a fixed bank margin, so it is cheaper when rates are low but can rise if the Swiss National Bank tightens.

As of mid-2026 the SNB policy rate sits at 0% and SARON is close to zero, so SARON mortgages currently cost little more than the bank’s margin. The margin, usually 0.7% to 1.1%, is the part you can negotiate.

The Eigenmietwert and what changes in 2029

If you live in your own home, Swiss tax treats you as if you paid yourself rent. This imputed rental value, the Eigenmietwert, is added to your taxable income, and in return you deduct mortgage interest and maintenance.

Voters approved abolishing the Eigenmietwert on 28 September 2025. It disappears from 1 January 2029, and most interest and maintenance deductions go with it. Until then, for the 2026, 2027 and 2028 tax years, the current system still applies in full. We cover the details in our guide to the Eigenmietwert abolition.

The real cost of owning

Beyond the mortgage interest, budget for the ongoing costs the affordability test already assumes: roughly 1% of the property value a year for maintenance and renovations, plus building insurance, any condominium fees, and utilities. Owners consistently underestimate maintenance, so treating that 1% as real money set aside, not a paper figure, keeps you out of trouble.

Steps to your mortgage

• Check affordability and equity early, before you fall for a specific property.
• Gather proof of income, equity and pension statements.
• Get financing confirmation from one or more lenders, and compare the margin, not just the headline rate.
• Decide on fixed vs SARON and your amortization method.
• Sign at the notary; the mortgage is paid out at completion.

The bottom line

A Swiss mortgage is less about the headline rate and more about clearing two fixed rules: 20% equity and costs under a third of income at an imputed 5%. Get those right, choose between fixed and SARON with eyes open, and plan for the Eigenmietwert change in 2029. Run your own numbers through the calculators above before you talk to a lender, so you walk in knowing what you can afford.

Frequently asked questions