I hear a lot of people on hear talk about late fees and how they use them. We never have in all the years implented a late fee as we have very few late payments. However, with all the new customers we have been signing up last year, and I foresee this year, I would like them to know from the beginning that there will be a late fee charged if they decide they are just going to send in their payments when they feel like it. How do I go about doing this? I'm sure I just can't charge what I feel like? Legally am I only allowed to tack on a certain percentage? I've looked online for late fees in Pennsylvania, but couldn't find anything. I just want to know what I'm legally allowed to charge. Anyone?