What actually changes at retirement?
The bank does not assess affordability once at purchase but again at every renewal. While you are working, salary is the basis. Afterwards what counts is income that arrives regularly and permanently: the state pension, the occupational pension, and – depending on the bank – an imputed return on remaining assets.
Taking your occupational pension as a lump sum leaves you with a smaller ongoing pension. That improves your asset position but worsens precisely the figure the bank looks at. Weighing the two against each other before you decide is one of the most effective levers available.
How does the bank calculate affordability?
The formula is the same as at purchase; only the income side shrinks. The bank adds the imputed interest of around 5 per cent on the mortgage, around 1 per cent of the property value for maintenance and running costs, and any amortisation. That total must not exceed roughly one third of gross income.
The imputed rate is deliberately far above the actual mortgage rate. It is a stress test, not a price: the bank wants to know whether you could still pay if rates rose sharply.
What happens to the second mortgage?
A Swiss mortgage is notionally split in two. The first mortgage runs up to two thirds of the lending value and need not be repaid. Anything above that is the second mortgage – and it must be amortised within 15 years, or by retirement at the latest.
This is not a formality. Postponing it leaves you facing a repayment obligation at 65 at the very moment your income drops. Bringing it forward reduces the loan-to-value ratio and your interest costs permanently.
What if affordability no longer works?
There are more routes than selling, and they are not mutually exclusive. Reduce the loan-to-value ratio with a partial repayment from savings or pillar 3a. Bring children in as co-borrowers or through a loan. Let a room or a separate flat, if the bank counts the rental income. Sell the property and register a right of residence or usufruct in the land register. Or plan the move to a rented home while it is still voluntary.
Timing is what matters. Five to ten years before retirement almost all of these routes are open and can be structured tax-efficiently. After retirement the choice narrows and the pressure rises.
When is it worth talking to the bank?
Earlier than most people think. An affordability calculation projected to your retirement date makes sense once retirement is roughly ten years away – ideally alongside a pension analysis that also models the lump-sum versus pension decision.
Ask explicitly for a calculation based on your future pension income, not your current salary. Only that figure tells you whether you need to act.