On residential jobs I normally dont have a problem, just when I work for scum bag builders. New residential construction I usually get 1/3 up front or within the first few days. Then another 1/3 at rough inspection and the final payment at the end. It's just these commercial jobs that are making me a little nervous. ALthough like I said most so far I've never had a problem, even though I'm still pretty new. It's just recently that I've worked for one that wont pay until the end and now just this week they said they want me to sign a lien release form. That sounds like they have bad intentions to me.
Thanks for your input guys. I knew I wasn't out of line for asking, and like some of you said I think it's necessary in this economy. I just found out today that a billion dollar home builder / developer in my state is going out of business.