Unless your contract of employment or commission doc says differently, it would be up to your employer. In my previous existence, we had a commission doc that outlined the circs where departing sales folk could get commission on deals closed or nearly closed at the time of leaving, but it generally depended on the sales person, their reason for leaving and the amount of work they had done on the deal. We were more likely to pay post-termination commission on deals that were actually closed but had an element of definite recurring revenue than to pay commission on a deal that wasn't closed at the time of leaving, particularly if the decision to leave was the individual's.
Sprite