Option trading, like stock trading, can be done without commissions on Robinhood. There are some fees that users pay as part of their transactions, including a trading activity fee and a regulatory trading fee. These fees don’t always apply to every trade, but one of them, the trading activity fee, does apply to every option trade a customer makes. The fee differs for option buys and sells, but either way it is only a fraction of a penny per contract. This small amount is rarely noticed by customers, and shouldn’t have a big impact on the outcome of trades.