If, for example, you leave France for Switzerland and you are married with children, your spouse and your child(ren) must accompany you. Otherwise, except in very special cases, you will still be considered a French tax resident. This is one of the reasons why expatriation is an important decision, as it implies the departure of the whole family.
Secondly, if none of the three criteria are met, you must be certain to be considered a Swiss tax resident. Thus, you must at least find a place of residence, be registered with the municipality of your domicile and have applied for a residence permit. If there are several ways to be domiciled in Switzerland, it is essential to be effectively domiciled.
Once you have acquired residency, you will be registered with the cantonal population office, thus confirming your new fiscal residence. However, it is necessary to pay attention to an often forgotten point: the exit tax.