What if the shoe were on the other foot? What company would hire me if I negotiated a salary and then after we shook hands and everybody had the warm and fuzzies, I said, "Well now, you'll understand this is just the rate I charge, so it is exclusive of federal and state income tax. These are additional fees that I am responsible, by law, for collecting from you on behalf of the government. I've broken the numbers down this way in the interest of full transparency."
That's pretty much how it happens in Romania. All (or almost) salaries are negotiated post tax (so what gets payed out to me) and the employer is responsible for paying the appropriate taxes to the government.
In that case you have to go to the tax office and file out some documents and then you pay the taxes for the investments separately.
There is a single income tax rate, 10%, so it doesn't matter how much you earn. If your investments make more than the annual minimum wage, you also have to pay the health insurance tax and "social security" tax.
What if the shoe were on the other foot? What company would hire me if I negotiated a salary and then after we shook hands and everybody had the warm and fuzzies, I said, "Well now, you'll understand this is just the rate I charge, so it is exclusive of federal and state income tax. These are additional fees that I am responsible, by law, for collecting from you on behalf of the government. I've broken the numbers down this way in the interest of full transparency."