Due to a very unfortunate reason that there are governments run by players as well that needs to be funded, there is no evasive action I can take like simply dropping taxation or setting a flat one. But what I can live with is presenting an as simplified as possible model every country can use no matter what is their RL applications are, so not seeking holy grail of ultrarealistic taxing game.
VAT is no brainer in that context, you simply deduct amount based on percentage already set by law in that country and et voila.
Income tax is rather simple again as no benefits, income segments, social security or retirement (in a perpetual game) involved. Just you work and receive your payment excluding income tax cut. But this "if you got money, you have income" approach is not an elegant solution when it comes to company owner as you might "invest" 1000 USD to company and then change your decision and withdraw only to be subject to income tax without income.
And for property tax, it is only for active ones because this is the tax for mainly regional authority and I don't want it to be heavy burden on players.