Pineiro
Hi Pineiro.
According to the local tax law, you have to declare all assets you own as of 31. December of the year in question worldwide (in Switzerland as well as abroad).
However, be aware, only assets in Switzerland are actually taxed in Switzerland. The value of your house in Portugal is only used to determine the tax rate. This tax rate is then applied to your Swiss assets. So, basically, you don’t pay twice 😉
Regards,
abrechnungen.ch