Let us say that I have two residences, one in Belgium and the other one in France. Let us also say that I have in each country a bank account opened with a document issued in that country. If I receive a salary in each country for some part-time jobs while I split my life between the countries, what would the tax implications be? Would I be liable to pay French taxes from my French Salary and Belgian taxes from my Belgian salary (I assume everything withdrawn from the source already) or would I have to do something else? And, not willing to circumvent any law, but could the fiscal authority of each country get to realise that I have a bank account in the other country and tell me something about it?
I'm assuming at the moment that nothing would be wrong as long as I pay French taxes from my French salary and Belgian taxes from my Belgian salary, so no fraud or theft.
And if they get to realise that I have an other bank account, what could potentially trigger that?
Disclaimer: I'm not willing to commit any offense whatoever, I'm simply asking whether to keep everything separate in each country is possible