Margin is a key part of leveraged trading. It is the term used to describe the initial deposit you put up to open and maintain a leveraged position. When you are trading forex with margin, remember that your margin requirement will change depending on your broker, and how large your trade size is. Margin is usually expressed as a percentage of the full position. So, a trade on EUR/USD, for instance, might only require a deposit of 2% of the total value of the position for it to be opened. Meaning that while you are still risking $10,000, you’d only need to deposit $200 to get the full exposure.