Yep I tend to look at Sony for the corporate Sin rather than one of the big 10 and really consider the following reasons for why your corp kicked you to the curb but still collect taxes . . .
1) Diverted food stores to feed an old friend only to find out you were duped by them and it was actually a valuable resource they were selling to another corp. They're dead and your on the outs till you (a) pay back the cost to the company (10% taxes) and (b) prove you've learnt not to be so trusting.
2) Your one of the elite and a position in the upper echelons is about to open, to earn it the bored board have issued a competetion all 45 contestants have to spend time on the streets no money, no tech beyond what they already have (starting resources) and the first one to earn X amount of funds gets the position while the rest get their sins burned and are cast out forever.
3) Your a dedicated focused employee and some of the higher ups decided to use you for a bet. They arranged things so you and some random sinless get your lives swapped. They get your house, your money, your job etc while you get tossed to the curb as an experiment to see what happens.
4) Your a small cog in a big machine and spent years embezzling small amounts of funds and comiting fraud because you genuinely sympahthize with the SINLESS and were using the funds to finance hostels and other care for them till you got caught. The corp decided to toss you to the curb till you payed back what you'd embezzled but didn't feel you were worth pursuing beyond that as in the grand scheme of things you'd embezzleed less than 0.056% of its net profit.
5) You were a loyal dedicated employee till a loved one was sacrificed (figuratively or literally) as part of corporate mauneverings. Now your out to get revenge but your biding your time, gaining the skills and allies you need, making them feel you don't hold a grudge etc in order to keep your corporate SIN valid and clean till you can use it to bring down the heads of the corp or at least hurt them.
6) You were a minor corp employee who nevertheless did sensative work e.g. data security or the like and your boss screwed up royally. You had a choice take the fall for them, get a slap on the wrist and in time they'll bring you back or take the fall WITH them and wind up with a criminal SIN and jail time.
7) You were the typical wageslave working and trying to improve things. You made the mistake of telling a supervisor their idea was not only stupid but recklessly dangerous (politely) because you believed they were merely ignorant of the nature of the work (trained as a manager rather than a technician). Their response was to get you put on essentially permanent unpaid leave for "stress and depression". Now your starving, desperate, hate the corp but still have a legal SIN because your on "leave" rather than "fired" or "transferred".
All of these are reasons you could have a corporate SIN and all if found out could generate a range of responses from "I remember you, that money you gave Father Tom paid for my wifes surgery and saved her life" through to "You bastard you planned to take us for everything you could then sell us out."