Is commission charged?
Yes, per side, so a round turn pays twice. It leaves the balance, so both floors and the profit target count it.
Every fill is charged at the rate the firms publish. A micro is fifty cents a side, micro gold eighty, and micro silver a dollar sixty.
It comes out of the balance, so it reaches your equity, so it reaches both floors and the target. A round turn at the full micro cap on a 50K spends forty dollars of a twelve hundred dollar daily limit before the trade is right or wrong about anything.
The rate is stamped onto each fill as it prints, so a change to the schedule can never reprice a trade you have already taken.
Exchange, clearing and NFA fees sit on top of this at a real firm. Those are not charged here, so the number you see is the floor of what it would cost you and never the ceiling.