No, I don't charge late fees for late payments. If they forget it then I control when they bring it back. I either request that they bring it right back, if I need it right away, or I might give them the option of a money transfer before the next morning. I rarely have anyone forget payment so I don't see any reason to put a policy in effect right now.

If you're having trouble with someone paying on time I would make sure you give them a written warning first, and explain to them that their payment helps pay for groceries... house insurance... crafts... etc. These are important things for a home daycare.