Cool…now I need to understand more how much taxes I would be paying, as I moved to Switzerland last year ;).
Income tax: Basically, you will be taxed on a fictive income (“valeur locative/Eigenmietwert”) based on the estimated tax value of your house/appartment. This amount would be balanced by the deductibility of your mortgage interests.
Wealth taxes: the tax impact would be positive as your wealth would decrease in the amount of your mortgage
Please note that this comment applies to the ordinary taxation and not to the tax at source (maybe it does, idk).