I never understood why people keep suggesting taxes.
Taxes exist so that government can pay for things. Government is synonymous with almighty God in this game, and doesn't need help from anyone to pay for anything.
If I want non-optional (re: forced, like taxes) community assets/services, it can just spring into existence with proportion of community wealth without actually taking any. If I want people to earn less if they hit certain income/property milestones, I can build that into the system without giving it to them and then taking it back away again.
Taxes don't actually make sense in the context of the game. As with all games that are not deliberately intended to be hyper-realistic simulations, any similarity between RoB and real life is only intended to give players a faster understanding of what is going on and what their goal is, so they can go straight into having fun.
Same goes for crime, which is also sometimes suggested: This isn't an RP server where "crime" is just a name for a game mechanic, and it's not actually crime but just a type of PvP gameplay. That mechanic doesn't fit naturally with the rest of the game, and it's only the assumptions that (RoB is supposed to be a simulation of a modern city) and (more simulation = more fun) that would make anyone think it would be a good idea in RoB; both of these assumptions are wrong. RoB is supposed to be a game that AFTER THE DESIGN IS MOSTLY FORMED happens to fit the "modern city" theme well, and more simulation does not always mean more fun.
In RoB, crime is breaking the rules. If someone breaks the rules I'm going to use admin powers to punish/ban them, and/or write a script to stop it from ever happening again.