Income and population mechanics

[Corinthian]

Also, are you sure the base income for that province is population/100? I ask because if the base number weren't 52.6 than it'd explain the difficulty we're having.

Do you have a fort or unrest in the province? If so it would increase or decrease the gold income from the province.

As for overtaxing, keep in mind that you can invest the money you get from overtaxing in order to reap further dividends down the line. Using the money to build a fortified city in a province with 20k pop and neutral scales will net you 50g/turn for every turn after its completion. This in addition to whatever other utility you can get from the fort. And if thats not your fancy, how about investing the money in troops for taking lands from your enemies? Who cares that your capitol is worn down, you can just use the money to take some other poor schmucks capitol.