Some comments (IANAL): You might want to retain copyright until the work is paid for in full. You can't really "issue" a contract. See http://en.wikipedia.org

Some comments (IANAL): You might want to retain copyright until the work is paid for in full. You can't really "issue" a contract. See http://en.wikipedia.org/wiki/Meeting_of_the_minds http://en.wikipedia.org/wiki/Meeting_of_the_minds. This messes up your definition of "Developer". Just state the two parties by name. The copyright assignment makes no sense. It basically reads "the client has copyright, except when he doesn't". Termination: so I give you 14 days notice within the 30 day payment window and then all your outstanding invoices are cancelled so I never have to pay? Great! I don't think you should have to get a lawyer, but you do need a contract to be unambiguous. I don't think that yours is.