The MOO2 Book / Game / Finance

Comes from population, each unit of population produces a number of BCs depeding on your bonuses.

TODO taxation formulas and bonuses;

The industry tax has nothing to do with the population. It can be set by clicking money button on the main screen to values ranging from 10% to 50% with a step of 10. This portion of production will be deduced on all of your colonies and converted into money 1:1. This only affects industry (worker) production, if none of your colonies have it than this won’t produce any money.

A special product that converts production to money 2:1 for normal races or 1:1 with the fantastic_traders racial trait.

Leaders with a megawealth skill provide a fixed sum each turn.

Each building has a fixed upkeep. This upkeep is increased on hostile planets.

Each ship has a fixed upkeep. TODO ship upkeep how much;

Products except Trade Goods and Housing can be bought by pressing the buy button in a colony screen, or a coin button in the Colonies menu. The cost depends on level of product completion:

TODO buy costs and ratios;

Upon completion of a building or a spy in version 1.31, the corresponding maintenance fee is charged immediately. To prevent bankruptcies due to completion of such building or spy, the game compensates once for that fee. Due to a rule change introduced in patch 1.40 (a side effect of the Credit Cheat fix), maintenance is no longer charged immediately but starting from the next turn. The compensation however still exists, causing the player to receive free money upon completion of such projects. In 1.50 this compensation for buildings and spies was removed.

The same mechanic applied to freighter fleets, however the actual maintenance charged in version 1.31 is between 0 and 3 BC depending on food shortage (while the food is not actually freighted!), and the compensation is fixed at 5 BC. As a result, there always is a net benefit of 2-5 BC. In version 1.40 no maintenance is charged for freighters on the turn of building so the net benefit is always 5 BC. The default in 1.50 is 0 BC. Because freighters are a special case and some players are accustomed to the old behavior, the amount of BC compensation is tunable with parameter freighters_cash_bonus.

Is a collective name for ways to obtain money by abusing build queue. These bugs were present in 1.31 and were partially fixed in 1.40. In 1.50 all such bugs have been fixed.