Eclipse: Second Dawn for the Galaxy

During the Upkeep Phase, when may I remove Influence Discs from my Sectors?

Only when you do not have enough Money (Produced in this Upkeep Phase, plus your Storage) to Pay your Civilization Upkeep Cost. Then you may remove Influence Discs until your Civilization Upkeep Cost is low enough. Note that if you remove an Influence Disc from a Sector, the Population Cubes in that Sector are immediately returned to your Population Tracks, which may also reduce your Money Production.