Is this calculated based on the canton that you live in? or the canton that you work in?

Since from what I find, Geneva seems to be double the tax for "impots a la source" compared to Vaud.

It's the canton you live in as far as I know.

So if you moved to France, Germany, Italy or Austria and commuted to work each morning - then you wouldn't have to pay any "impots a la source" or you would have slightly different taxes based on other things?

I hope it goes down next month I'm now earning more Brut but less Net than last month and I now have to pay more expenses (for apartment and commute).

Well, you wouldn't pay any impot à la source for Switzerland, but of course you'd pay equivalent taxes in whichever border country you're living in. You'd also have to get your permit changed from a B (I assume) to a G cross-border one.

Correct, except if you work in GE and live in France: they will take GE import a la source too (by agreement between France-GE, apparenty), which is offset from your French tax return ... (just in case you 'forget' to pay the French tax authorities).

But even Geneva's "high" tax rates are lower the neighbouring countries.

Vaud is lower (but not really half..), so you could save if you move to Vaud. But it probably has to be quite a bit into Vaud, as the neighbouring properties are already taken by people who thought about it before you :-) . Also need to check the permit, as non EU need authorization to change cantons.

Hello!
If I’m unemployed and I’m getting benefits from “Chomage” do I need to pay “impots a la source” by my own? Or they are paying this? ( in “salary certificate I don’t see this tax)
I’m from Vaud.

The monthly wage statement from the Caisse should show a source-tax deduction normally as the last line-item after the AHV, NBU and BVG social charge deductions, resulting in the Netto amount. A source-tax deduction would only apply to those who are subject to source-tax.

At post 29 of this link is a translation of a monthly wage statement. Unfortunately, the example is for someone not subject to source-tax but it still might be useful:

https://www.englishforum.ch/employme...nslated-2.html

It's not generally true that the withholding tax is lower in Vaud than in Geneva. As a single person with no kids, my tax in both cantons would be the same (a tiny bit cheaper in Geneva).

But if you add children to the equation, Geneva becomes significantly cheaper. In fact, for taxes Geneva is one of the cheapest cantons for families in the country.

I don't know where this myth about taxes in Vaud being cheaper than in Geneva comes from, but I bet it's something historical.