As I recall, the problem relating to futures margin in an IRA retirement account was that if you blew out your account in a fast moving market and you owed your broker money, there are regulatory obstacles to adding money to your account to make up the loss because you are only allowed to deposit a maximum amount per tax year. So this created a very odd situation that doesn't exist in a regular non-IRA account. It seems that IB's solution was to increase the margin significantly so your position will be closed automatically by IB's risk program when you reach the margin minimum and before you incur any liability to the broker.