Swiss interest rates could rise, but an imminent increase is not inevitable. Crucially, a new fixed-rate mortgage can become more expensive before the Swiss National Bank changes its policy rate.
As of 30 October 2026, borrowers should distinguish three things: the SNB policy rate, mortgage terms offered by lenders and the complete cost of financing a property project. They do not move at the same time or in exactly the same way.
What the SNB decided, and what it did not promise
In its 24 September 2026 monetary policy assessment, the SNB kept its policy rate at 0%. It reported 0.8% inflation in August 2026 and forecast annual average inflation of 0.7% in 2026, 0.8% in 2027 and 0.8% in 2028.
This inflation forecast is conditional: it assumes a constant 0% policy rate throughout the forecast period. That technical assumption is neither a promise to keep rates unchanged nor an announcement of future increases.
In its September 2026 outlook, Berner Kantonalbank (BCBE) expects an unchanged policy rate through the end of 2026, followed by several increases in 2027. This is its economists’ scenario, not an official SNB decision or a guaranteed consensus.
Our interpretation is cautious: near-term stability remains plausible, while a rise in 2027 belongs in financing sensitivity tests. A precise path for 2028 would be too uncertain to serve as the sole basis for a borrowing decision.
Fixed mortgages can move before the policy rate
Fixed mortgage pricing reflects market conditions over the selected term, a lender’s refinancing and hedging costs, and its margin. Interest rate swaps used to manage rate risk already incorporate expectations about future years.
The Comparis mortgage barometer published on 13 October 2026 illustrates this: indicative ten-year fixed mortgage rates rose from 1.77% at the end of June to 2.07% on 30 September 2026, while the SNB policy rate remained at 0%. This is an increase of 0.30 percentage points, not 0.30% of the original rate.
Product | End-September 2026 reference | Type of observation |
|---|---|---|
First-ranking SARON mortgage | 0.8–1.2% | Average range of offers reported by Comparis |
Three-year fixed mortgage | 1.75% | Published indicative rate |
Five-year fixed mortgage | 1.90% | Published indicative rate |
Ten-year fixed mortgage | 2.07% | Published indicative rate |
These are not live quotations for 30 October or binding offers. The indicative fixed rates draw on more than thirty lenders; the SARON range is not an identical statistical measure. Actual terms depend on the borrower, property, equity and negotiations. These residential mortgage figures should not be directly applied to construction loans.
Three different types of exposure
SARON mortgages follow short-term money-market rates alongside the lender’s contractual terms. Changes also depend on the margin, any interest floor and the calculation method. A 0% policy rate does not make the loan free.
An existing fixed mortgage generally retains its contractual rate for the agreed term. New offers, refinancing at maturity and additional borrowing are exposed to current market conditions. Early termination may involve compensation under the contract.
Development financing requires a broader assessment: reference rate, bank margin, fees, security, drawdown schedule and repayment conditions. An approved facility is not necessarily fully drawn from the start of construction, so its limit is not automatically the interest-bearing balance.
Worked example: financing sensitivity
Rather than relying on a future rate cut, test several assumptions. This hypothetical example assumes average debt of CHF 10 million, fully exposed to a rate change for twelve months, with no change in principal or other charges.
Rate assumption | Additional annual interest |
|---|---|
Unchanged | CHF 0 |
Increase of 0.25 percentage points | CHF 25,000 |
Increase of 0.50 percentage points | CHF 50,000 |
The formula is exposed debt × change in rate × duration in years. These are sensitivity assumptions, not market forecasts. If only part of the debt is variable or being renewed, apply the calculation to that portion. Progressive drawdowns require a period-by-period calculation.
Add the resulting amount to the project budget without confusing it with a percentage-point change in the project margin. Delayed delivery or sales can extend borrowing and increase the impact of higher financing costs.
Prepare rather than speculate
The key question is not simply whether the SNB will increase its rate. It is which portion of the financing can be repriced, when and with what cash-flow consequences.
For a purchase, compare offers with equivalent terms and conditions. For a development, assess drawdowns, fees and exit dates too. Our mortgage calculator can help explore purchase-financing assumptions, but does not replace construction-loan modelling.
Sources and limitations
- SNB, monetary policy assessment, 24 September 2026: policy decision and conditional inflation forecast.
- BCBE, interest rate outlook, updated September 2026: economists’ scenario and transmission mechanisms.
- Comparis, third-quarter 2026 mortgage barometer, 13 October 2026 release: end-September mortgage references.
Sources accessed on 30 October 2026. General analysis, not a bank offer or personalised financial advice. AI-generated illustration, not an actual development.
Frequently asked questions
Are Swiss rates certain to rise in 2027?
No. BCBE anticipates increases, but the SNB did not announce a timetable for rises in its September statement. Decisions will depend on economic conditions and inflation.
Can a fixed mortgage become more expensive without an SNB rate change?
Yes, for a new offer or renewal, because market pricing can change first. An existing fixed mortgage generally retains its rate for the agreed contractual term.
What would a 0.50 percentage-point rise cost on CHF 1 million?
For CHF 1 million fully exposed for one year, without amortisation or other changes, additional interest would be CHF 5,000. Actual results depend on the contract and timing.
