This should really go without saying, but there are many angles that I can attack here. First off, you should always pay your employees. Even if you don’t like the end result of their work, the questions you should ask yourself are: did the person do the job to their best ability? And, if the work wasn’t finished on time, did you yourself hold up the process? If your answer to any of these questions is yes, then pay the person; and if there should ever be a conflict of how much to pay the worker then ask yourself, is the difference enough to not pay and potentially ruin the relationship and soil the name of your business to them and their colleagues? If not, then pay more. It’s that simple.