Commissions are immaterial to purchasing power.
Actually they are, especially when you are pushing $2000 in commish per day. I can confirm that the commish are still not being deducted in realtime.
Here's my statement from Saturday morning, where I was flat...
And I opened a 2 contract MNQ trade early today's trading session, and here is what the NT account screen shows as we are sitting in a closed state right now...
There should be a ~$0.80 difference between the two. I'll keep an eye on it, and look to see if it changes either at market open in a few mins, or after midnight tonight.