Trade commissions can vary greatly from one broker to the next based on a range of factors. The biggest factor will be whether or not you opt for a per-trade or per-share commission structure. If, for example, you have to pay a flat $10 per-trade commission and you make a trade worth only $20, you’ll essentially be paying a 50% commission. But if you make a trade worth $1,000, you’re only paying a 1% commission. With the right strategy and the knowledge of how to lower trading commissions, you can optimize your ROI.