Starting day trade buying power is your account's maintenance excess at the close of the previous day. Unlike maintenance excess, starting day trade buying power is static and will not change throughout the trading day. This number is essential if you plan on day trading because if you go over your starting day trade buying power, it can result in a Day Trade call (DT).

To learn more about maintenance calls, please click here.

To learn more about Day Trade calls (DT), please click here.