[Darkwind]

Jacking up taxes also kills population--sure, 200% tax rate will get you the same amount of gold, but it'll kill quite a bit of population and affect everything in that province. Not to mention that you need units to keep the unrest low, which somewhat dampens the use of increasing taxes. Unless you use undead to patrol, which is usually hard to do unless you're Ermor.

And don't forget, if the population demands it, the Bank of Ulm will open an item branch.