Fire your broker. In any account, retirement or regular, you do need to have something called "Reg. T Margin" on the account in order to use the proceeds of a sell to buy a new position without waiting for the sell trade to settle. Just ask your broker to add "Reg. T Margin" to your account, then ask why s/he didn't tell you that you could do this, and if s/he still says you can't do it, call another broker. Research brokers carefully for day trading resources, commissions and margin rates. We highly recommend InteractiveBrokers.com. Their tools are amazing, and we are unaware of anyone who can match their incredibly low commissions for day traders. Those are listed on their website.