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Here is the orignal article in French.
"Where do I pay taxes when I live and travel in a mobile home?
As a general rule, you pay taxes where you live. If this is constantly changing, tax matters become complicated.
Depending on whether you’re gainfully employed and traveling within Switzerland, or a globetrotter, you’ll have to pay taxes in different places.
Principle: pay taxes at your last place of residence
The Civil Code stipulates that a person’s domicile, once established, remains in force “as long as he has not created a new one”. According to the established jurisprudence of the Swiss Federal Supreme Court, it is not sufficient to deregister from one’s former place of domicile in order to no longer have to pay taxes there. Rather, the relevant factor is that, under all the circumstances, a new domicile has been established.
Tax liability in the event of a permanent change of domicile in Switzerland
In principle, you pay taxes in the canton in which you reside with the “intention of settling there permanently”. If your tax domicile changes during the course of a tax year, you pay tax in the canton in which you are domiciled at the end of the tax year.
In the case of a permanent change of residence, you do not intend to stay permanently in another place. This is why the Swiss Federal Supreme Court makes the link here with an actual stay in the sense of a physical presence, whereas the subjective element of the intention to stay permanently is not required. If you are gainfully employed, you pay tax in the canton in which you are resident for at least 30 days. If you are not gainfully employed, you are subject to tax in the canton of residence if you stay there for at least 90 days. A short interruption in your stay is irrelevant and does not release you from tax liability.
Finally, real estate ownership also entails a tax liability, even if you have no residence or tax domicile in Switzerland.
Tax obligations for globetrotters
If you leave Switzerland for an undetermined destination, you generally take with you the tax liability of your last place of domicile: you cannot be domiciled in more than one place at the same time, nor can you have no domicile at all. For the Swiss Federal Supreme Court, this is clear: it is therefore irrelevant when the taxpayer deregistered or left his former place of residence. If he moves abroad, he must pay direct federal tax until he can demonstrably establish a new domicile abroad."