First and foremost, never trade forex with funds that you cannot afford to lose, such as funds for a mortgage, rent, or food. The quantity of money you start trading forex with is entirely up to you after you’ve perfected your approach in a demo account and gained the confidence to open a real account. To test if your method and trading plan are sound in a real trading environment, you can begin trading forex with as little as $100 at first. Depending on how well your plan works out, you can later contribute more money to your margin account.