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| My girlfriend has a similar situation. She's a student in Zürich and on paid leave (during 2016) from her company back in Brazil and they sent her a Tax form for 2016 (she only lived here for a month in 2016 earning something).
She's already going to be taxed on 2016 and they said I need to prove that.  | |
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Everyone is taxed individually. You cannot put her under your expenses unless she is physically incapable to work.
The only double taxation treaty between Brazil and Switzerland which I found was this:
https://www.admin.ch/opc/de/classifi...111/index.html
It only relates to companies operating aircraft and ships.
In general worldwide incomes wile being resident in Switzerland is taxed. Means in case of your GF this one months income is taxed in Switzerland. But, the actual taxrate applied depends on the total annual income.