It mainly depends on the host country and the length of your stay. In general, if you stay for more than 6 months in a country, you are considered as a resident and subject to local income taxes.  If you stay less than 6 months, you may be exempt. However, depending on the country you are in, this can vary.   Beware; the income taxes can be relatively high compared to what you pay in France. All these elements will be provided in your simulation beforehand. On-site, we have a specialized office that will assist you with all these steps.