House Income

House Income refers to the funds generated by a House's holdings, which can be spent by the Head of a House. The amount of income generated depends on the state of a colony's economy.

Codex
"As a leading house, you have two main sources of income; - the wealth you extract from your directly owned territory, and from the noble vassals on your colony (this is displayed as an aggregate figure for simplicity) - the taxes you levy on your vassal rulers and leaders in your faction and league

You can improve your income by; - investing in the economy of your colony - increasing your house's capability in Administration - raising the tax rate on your vassal rulers and leaders"