The Incorporate X / Y cost tracker shows X as how much cash on hand I had when I imported my save file and Y as the huge intimidating but probably obtainable amount the business would presumably cost. X hasn't changed for me, however, despite earning some cash street fighting and via merc work and losing it all in a Become Legend cycle.
At this point I don't know if it's only displaying the old value, if it's not updating the variable checked against the Incorporate option, or if I'm misunderstanding the display altogether since I'm new to this version.