Not sure if I understand what you're asking, but maybe this will help.
Your balance accrues based on your revenues from games played, minus your operating costs. At season rollover, you carry forward whatever your ending balance was. Then you get your league payout, whatever your world pays to each team for operations. In World 63 it's 4 million, not sure if it changes from world to world because that's the only world I've played in a long time. Then you account for your roster's cost at the start of the season.
Carried over cash + league payout - total salaries = balance on Day 1.