In the bottom left corner is the general feeling about you. The population can love you, like your leadership, be undecided about you, not like you or hate you. If the populations are mad at you for several turns they may grow unhappy and start to riot or even start a civil war. During a riot or war the population will kill each other and destroy structures.
To right of the general feeling toward you is an estimate of how much money may be collected the next turn. If the tax rate is set too high a riot will take place, the tax rate will drop to 0% and no taxes will be collected.
The population will become upset with you if taxes are too high or there is over population. They may become upset if there are too many mines, factories or defense posts and an environmentalist movement is active within the population.
The maximum amount of taxes that can be collected from the natives depends on the number of colonists on the planet.
One hundred colonists ( one clan ) can collect one megacredit per turn.
Higher tax rates slow the birth rate slightly.
The amount of taxes that a race can collect per turn can be adjusted in the HCONFIG program. However, if the rates are changed they will not match up with the amount projected by the PLANETS.EXE / WINPLAN.EXE programs.
These programs expect the Federation player to get double the credits and all other players to get normal credits.