On top of the price, allow around 4 % in acquisition costs (3 % registration duty, land registry and notary) and, if you borrow, the mortgage note, at around 2.5 % of its amount. You also need at least 20 % equity. Casatax can reduce the duties for an eligible main residence. Example for a property at CHF 1'000'000: around CHF 40'000 in acquisition costs and CHF 20'000 for the mortgage note (borrowing CHF 800'000), on top of CHF 200'000 in equity. Main residence eligible for Casatax: the duties fall by around CHF 21'000 and the mortgage note costs by half. Total costs drop from around CHF 60'000 to CHF 29'000.