I just started out and I have 3 accounts (one being bi weekly) and my second customer I got is now late on his payment (only by one day at this time, but still late) As a new business I need my money on time. I am wondering at how many days delinquent do you wait to send out a late payment reminder. The bill is 390 for a clean up, and a week of maintenance. The invoice was sent out on the 30th of May and due on June 15th. What should my corse of action be?