What I have just done to generate infinite money for me and only me was going into the buildings effects. Once you are editing the building effects, there is usually at least one unique building for each faction. what you need to do is to find your factions unique building and make sure it has an effect on taxes (add the effect if its not there) and make the number however high you want. once you make the building in the game, you will start to swim in money. I think you can hold out until you get that building if you start going for it immediately.
its late for me right now, but if you want me to go into more detail I can tomorrow.
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