Hi Michelle-
I have my own billing service and send out invoices to my clients on the first day of the month. It is very clear in my contract as well as on the statement that payment is due by the 10th of each month. I've experienced (several times) late payments. Do you use late fees? Hold their claims? I try to keep an excellent relationship obviously with my clients, but this is so annoying! I have bills too!! Any suggestions?