Couldn't I just pay all of that stuff by my own to show them I have no intention to do so? I want everything to be legal. I do not want to save any money in tax

Couldn't I just pay all of that stuff by my own to show them I have no intention to do so? I want everything to be legal. I do not want to save any money in taxes, health insurance or social insurance. I am actually happy to pay all this. Nevertheless I heard horror stories even by doing so you are at risk they will f..k you anyway after a Prüfung (audit) within the first five years or so.