So some time ago I switched jobs between two companies. Or maybe I didn't.
What actually decides if you need to list a work history as one job or two?
In my case I switched between what are basically two companies owned by the same parent company, except that in both cases the parent company was the one actually signing my paycheck, determining benefits and retirement, determining job classifications and pay ranges. Each child entity hired me and had their own HR department and budget, and could determine pay and raises within the pay range, but the money for the positions would go to the parent company and then be paid to me. When I switched, I kept all accrued benefits as if I stayed at the same place, but at the same time I had to fill out all the paperwork as a new hire (but I wasn't actually allowed to make choices, for example the insurance option I had selected when I was hired by the first child company was the one I had to put down when I switched to the second child company).
As far as taxes go, I received a single W2 that held my wages from both positions combined during the year I made the switch.
If asked where I work(ed) at, I could honestly answer either "I work for parent." or "I use to work for child1 but now I work for child2."
So in work experience, what should I use to determine if this should be listed as two separate employments or one employment that spanned two positions?