Hello. Thanks for your answer. However, i have been taxed so far on economic affiliation basis and the profissional that filled my tax return in switzerland includes all my worldwide income and wealth...
Economic affiliation
If you are resident outside Switzerland for tax purposes, but maintain business premises or own real estate there, or are gainfully employed there, those parts of your income are subject to Swiss tax and must be taxed in Switzerland. Again, your worldwide income and assets are used to calculate your tax rate.
My question is basically, if for tax purposes the cutoff date is end of year or the fact that i owned property part of the year forces me to fill a tax declaration?
You should have filled the final tax return immediately after selling the property, mid year, and it's over. It's similar to settling the taxes when leaving the country for good. Contact the cantonal tax authorities where you've been taxed.