Although this is sort of a kingdom specific question, I wanted to get a feel for what the general community thought of this (considering it's a variable that'll be set by the community)
If players are charged a tax, how high would this be? If taxes are too high in an area, people are just going to leave to a new area. You have to consider that when new players start joining and you say "Welcome to our community, oh and btw, you owe taxes", I imagine they'll be a bit put off by that. People just want to play the game and they won't want to owe money to other players just for the sake of "the king demands it" or "its for your own safety". And when a player starts out, they might just be trying the game, they dont want to owe anything in a game they just started.
Tax collecting can be a pretty tedious job if it has to be done in person. Collecting taxes also means work for the governing body. How can you get to every player if they aren't online? How can you force an OPC to pay a tax? Especially if they just spent all their money on something expensive?
So what do people imagine a tax in this game to be like to keep it fun? Will governing bodies decide to not tax to avoid the hastle? I imagine if there's no tax, there will also be more influx of players. That means people also might support you more. Will people be able to sustain infrastructure without help from the community? Will tax only be on landowners, and if so, is that something they have to check in on? That would mean every landowner would have to be accounted for if a tax was implemented. It's a lot of work if you ask me, and it's not work that I could see anyone particularly enjoying.
In a game I've been playing recently, one of the mechanics is, any trade through the in game market has a tax based on which city you're in, mostly for gold sink purposes. Is this something that can be implemented automatically also? Like a player buys something and a fee is automatically deducted to go to their town, or their duchy or whatever