⚡ QUICK ANSWER A service contract that only says "final payment due upon completion" is missing five specific clauses that determine whether you actually get paid when a client disputes the work, misses a deadline, or decides to cancel. Those five provisions are: a milestone-based payment schedule, a late fee clause, a kill fee for cancellations, a dispute resolution clause, and a non-refundable deposit requirement. Without all five, your payment obligation is defined — but