Each province and city generates a tax base each month. The amount of gold fed into the tax base is determined by the civilization level of the province:
civ level tax gold --------- -------- wilderness 50 civ-1 200 civ-2 250 civ-3 300 civ-4 350 civ-5 400 civ-6 450
The tax base support garrisons, can be collected by castles, or seized through pillaging.
Pillaging and opium consumption reduce the future tax base of a province (see Pillaging and Opium).
A city's tax base is added to the province's tax base at the end of the turn. If the city is pillaged during the month, the amount transferred to the province will be diminished.
Gold left in the province at the end of the turn does not accumulate.