I was trying to think of how a tax system could be setup for housing within a tribe zone within the current game setup. I don't know what other systems will be added later so I tried to think of how it would work right now.
The tax would be based on the tribes set currency
The person with the correct rank would be able to right click a door and set an option that says this is a taxable item, a new option would become available that gives you several options.
1. Set amount of tax
2. Set the interval it has to be paid
3. Set a grace period
4. Select the player to be taxed
The person paying the tax would be able to right click the door for making tax payments
The person with the correct rank would be able to right click the door and remove/collect the payment
If payment is not paid within the grace period, the door changes to a darkshade of color or anything that would show the tax wasn't paid and the ability to lock your door would be removed
The reason I would rather have it this way where you can set individual tax is so that you can offer different size housing areas where the larger housing would obviously have a higher tax.