I too have a late fee of $1/minute late..It works great for me! I've only had to charge $7 in late fees over the past 4 months....with that being said I do also have a clause in my contract saying along the lines of if a parent is consistently late picking up their child they will be placed on a 1 week probation. If they are still coming late to pick-up throughout the probationary week the parent will be given 2 weeks written notice of termination.