Margin Call and Stop Out in the Forex market are considered critical points. Margin Call (Guarantee fee requirement) – This is the point where you will need to deposit more funds to keep your position(s) active/open for loosing positions. You will only get Margin Call for losing positions. If after the margin call you don’t deposit additional funds on the trading account, and losses continue to grow, at a certain point the price will reach the Stop Out, and your brokerage company will automatically close a certain number of positions, possible even all open orders.