The top ten percent is somewhere around 113K per year.
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That's cuz only rich people have 529's.I think that was sarcasm (am I right, @mom2collegekids?) I know it made me lol, anyway.
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@scholarme Yes! I was being sarcastic! 
the white house got to much pushback on this bizarre plan…it is gone
http://www.usatoday.com/story/news/politics/2015/01/27/white-house-scraps-tax-plan-529/22429695/
Yes, NPR said the decision to drop it was made after Nancy Pelozi cornered Obama on the matter on Air Force One. I’m amazed they ever proposed it. There are hundreds of tax breaks that should be removed before 529’s are de-incentivized.