I have spent a career advising clients to avoid partnerships, because one of two things always happens:  They have profits, and argue about how to divide them; or they have losses, and argue about how to pay them.  I am always amazed by how many partnership questions there are here.  But then, even with an LLC it is often a good idea to elect S Corporation status.  If you can't trust the people you invest and work with, enough to share your SSN, then you probably can't trust them at all.