I presume that the 99%-1% divide is intended as an index of USA income. Of course my belief that countries are social fiction makes me want to consider the world wide numbers.
I found this kinda out-dated and sorta-sketch indication. It says that the top 1% is anyone making more that 47K a year. More than 25K puts you in the top 10%.
You can check yourself with their tool here.
Let me know if you find a better source.
*For the metaphorically inclined, I'm not trying to suggest that someone with 37 kids and a mortgage and an income of 30K annually has it great and has no right to complain or some such. Anyone can complain if they want to. Just remember how you feel when those richer than you complain, and then take a second to realize how rich you are too...