
Originally Posted by
ajm317
Generally speaking it's ok to add almost any provinces with your religion and in your culture group. Wrong religion provinces lose 30% of their tax income, and wrong culture group ones lose another 30%. Remember that tax income essentially pays off twice a year once you get core on the province, once monthly and once on Jan 1.
Wrong culture/wrong religion provinces are where you have to start thinking about whether or not you really need it. You can always convert the relgion, but culture you're stuck with.