First of all, as the name suggests, this bonus is for new Betfair users only and is only valid for those who have completed the full registration form. Within 30 days of opening your account, if you make a first deposit of $10 or more, Betfair will give you double the amount you deposited into your account. Please note that the amount depends on the country you are in and the currency used there. The bonus will be visible in your account but you will only be able to use it after the first wagering of the deposited amount, it is valid for 7 days and can only be used for casino games.