I think FINRA has day trade buying power limitations in place. And usually, it equals to 4x previous maintenance excess. But in IB's spec and website, I didn't found any DTBP restrictions. The only parameter that will affect how much you could open is Available Funds(ELV - IMR). So, did I miss something? I know IB won't issue calls, but where're the DTBP limitations? For reference: 1. https://www.finra.org/investors/day-trading-margin-requirements-know-rules 2. https://support.robinhood.com/hc/en-us/articles/360001227066-Day-Trade-Calls
IB does have margin limitations for intraday trading. https://www.interactivebrokers.com/...hm=us&ex=us&rgt=1&rsk=0&pm=1&rst=101004100808