End of project/flip - what documentation do I need?

[David Green]

I am wrapping up my flip and was wondering what type of payment documentation I will need for both legal and tax protection.

The project involved a GC, electrician, plumber, and granite vendor.

Do I need to get waivers from all these guys?

I found this form online that seems to be sufficient.

http://www.cslb.ca.gov/Resources/MechanicsLien/ConditionalWaiverAndReleaseOnFinalPayment.pdf

Also, what do I need for taxes? I read that I might need a W9 filled out by each contractor? Is this mandandory per the IRS?

Thanks