[varispeed]

Worker always pays all tax. If you get X and pay Y tax and employer also pay Z tax, the reality is that you make X+Y+Z and pay Y+Z of tax, it just happens that Z is attributed to the employer, but it makes no difference. So if the Z increases, then X and Y will decrease or if X and Y stays the same, it only means you are now making more, but the difference goes to the state purse. Now if the increase goes beyond the budget allocated for salaries, the solutions are - increase the budget, make cuts, fire someone and if employer increases the budget then you just made a rise.

[LeonB]

If the employer finds a way not to pay Z - do they give it to you? (No they don’t)

[varispeed]

No, you just don't pay it and that means you save.

[jjk166]

Then you quit and go to an employer who will give you Z.