This is interesting post to read all about Commissions, setup and calculations in AX 2012 . Commissions in AX2012 have been the Part of distribution and trade, commission is calculated for the sales person at every Sales order level based on the percentage of revenue or contribution Margin. To read the post click on link below
http://blog.systemsadvisers.com/item/commissions-setup-and-calculations-in-ax2012.html
http://blog.systemsadvisers.com/item/commissions-setup-and-calculations-in-ax2012.html