Providing tax information, along with your social security number, is required if your account net profit exceeds greater than $600 within a calendar year.
All customers must fill out tax information once they profit $600 or more on the platform. Winnings are not taxed by Underdog directly, but you will be sent a 1099 form if your profit remains at $600+ in a given year. All winnings of $600+ appear on your 1099 form, regardless of what is withdrawn.