If a pattern day trader exceeds the day - trading buying power limitation, the firm will issue a day - trading margin call to the pattern day trader. The pattern day. This would give a buying power of 4 X 10, = $40,). If this is exceeded, then the trader will receive a day trading margin call issued by the brokerage firm. realonlinegame.win ======== Subscribe to our YouTube channel: realonlinegame.wine. com/user/OptionsHouse.