The three primary expenses to consider while trading CFDs are the commission, spread, and overnight holding charge (swap rate). The commission rate, which is the major charge, is what the broker generates money from and can be a percentage (e.g. 0.1%), a fixed price (e.g. £5 per trade), or a combination of both. The spread, which is the difference in price between the bid and ask, can also be a factor to consider. Lastly, there is the overnight swap rate, which is charged for each night a position is kept open.