The US IRS is yet to issue guidelines on whether prediction market gains should be taxed as derivatives, gambling winnings, or income, worrying accountants (Kate Knibbs/Wired)

https://www.wired.com/story/nobody-knows-how-to-file-taxes-on-prediction-market-wins-and-losses/
http://www.techmeme.com/260407/p18#a260407p18

Nobody Knows How to File Taxes on Prediction Market Wins

Americans flocked to prediction markets last year. Now, it’s time to pay taxes on winnings. How do you do that? Great question.

WIRED