First move payment day to Monday instead of Friday and that way you get paid in advance and it also means since I don't go to the bank till Sat that I can afford to give a couple days grace to certain families without it impacting on banking. If it is becoming a habit and you have let it slide in the past then there is a good reason to speak with them and remind them that if you don't get paid on time that you can't meet your financial obligations and that that includes food, crafts, etc for their child at daycare. Ask them if it would be ok if she didn't eat next week since they didn't pay you for her food. Sometimes we have to put things in terms they understand and can identify with. IF their child will be impacted they might be more likely to pay on time.