While we cannot provide you any tax advice, we can say that as soon as you have redeemed $600 or more in a calendar year from your game, you will be prompted in-game to be sent a 1099 form.  In order for the game to send it to you, make sure your address is up to date, and enter the last 4 digits of your SSN for security. For any further information on that topic, we recommend you speak to a tax professional on what other information is needed and how to file it.