You can use your Pillar 3a assets to support a property purchase in Switzerland, and this is actually one of the key benefits of the 3a system for those planning to buy a home.
Under Swiss law, you are allowed to use the funds in your Pillar 3a account either for a direct withdrawal or as collateral (a pledge) to support the financing of an owner-occupied residential property. This must be a property that you intend to live in yourself, not a rental or investment property.
Each option has pros and cons. Direct withdrawal reduces your retirement savings but boosts your equity and lowers your loan. Pledging preserves your retirement assets and tax benefits, but may result in higher interest costs as the mortgage remains larger.
You should also note that different mortgage lenders may have their own policies around how 3a funds can be used. It is always worth comparing offers and confirming terms.
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Please note that all content within this response has been prepared for information purposes only. This response does not constitute financial, legal or tax advice. Always ensure you speak to a regulated Financial Adviser before making any financial decisions.