Income only runs at he end of every month, and it has been delayed often as there are too many income facilities for the server to easily handle. Your other problem could be an inactive operator.
The operator is the person who is usually running the day to day operations of the facility. In income facilities, it is the person who has a high trading skill and can therefore get you the most money. Many people set the operator to few people who offer their services to the public.
Edited By: Jevon Lambright on Year 11 Day 289 21:05
Thanks for the tip. Since I don't know anyone, I've set myself as operator for the time being. Hope they start paying out this month. 7 offices, 2 hotels, and 3 taverns ought to bring in SOME kind of money...
Its also possible that they were built since the last FI run, and so even if they were set up correctly (manager active, operator active, powered and open to all) they would not have received income and so would show up as 0 on the inventory page.
And Jevon shame on you - its Trade skill as Vek said, not Leadership that determines the income.