IRAs are treated exclusively as personal income sources. The income is taxed only when distributions are taken, and the IRS does not care how the money got into the account. They only care how much you take out of it.
As fas as my understanding goes, there is no such thing as a marginable equities IRA account. There are brokers that allow trading of leveraged instruments through an IRA account, however. In this case, taking either long or short positions requires borrowing against the full contract or cash value, so margining the account is necessary.
RoughTrader
As fas as my understanding goes, there is no such thing as a marginable equities IRA account. There are brokers that allow trading of leveraged instruments through an IRA account, however. In this case, taking either long or short positions requires borrowing against the full contract or cash value, so margining the account is necessary.
RoughTrader