Listen to the latest swapa call to get the story behind "retro" vs. "bonus". In a nutshell, the company will NEVER approve true "retro" because it would involve restating earnings, taxes, etc etc for the previous few years. Won't happen. So SWAPA is going to do some math to try to make a "signing bonus" that is about the same $$$ as a true retro payment, and hope enough people figure it out and don't pitch a fit about the label that is attached to the payroll deposit.