Forex brokers can (and do) charge fees for using their services and their platform. These fees generally come in three forms: Commissions simply represent the fee charged by your broker for the trades being placed for you. This may be a flat fee charged on a per-trade basis, or the commission might be expressed as a percentage of the amount traded. Spreads are typically measured in a unit called a “pip”, and they communicate the difference between the “bid” price and the “ask” price for a currency pair. Swaps (or rollover fees) represent the interest that can be charged (or in some cases, earned) for positions that are held overnight (and, like spreads, are generally expressed in pips). Keep in mind that wide dealing spreads, swaps, and high trading commissions can stack up quickly, adding considerably to your transaction costs when trading forex. If you intend to be an active forex trader, it can pay to shop around for the fee structure that will best suit your trading style.