the rules-
Temporary income lists everything else that happened this week. This is where income/expenses from player transfers will go, fees for changing staff, and so forth. While you have bids out on players but the sales are not complete, you can get a preview of your temporary income on the Bids page.
Net income is Weekly temporary income MINUS all Debits (Gross income minus expenses=Net Income, if it is in the Debit column in red, then you had negative income for the week.