As a newbie I've not given allot of thought to extended hours trading until last Thursday when my short position took out my profit target about a half hour before open. I had taken a short position in SFUN on Tuesday at $10.49 and on Thursday it dropped below my buy limit of $9.25. By open it reversed and I ended up buying to cover at $9.54. Cost me roughly 3% of my profit target. My question is what does Interactive Brokers charge for extended hours trades if you check the little box in TWS that says allow extended hours trades. I did a search for it on this forum and I also have tried to find out without success through IB's help pages. (Probably due to my own incompetence.) Does anyone know what IB charges for extended trading hours trades? I just don't want to find out by executing one.
AFAIK there's no difference for US equities during regular vs outside normal trading hours. There may be limited exchanges offering trading, which might impact costs depending on your commission plan and your trading style, but I think the simple answer is it doesn't matter.