I charge $2/day more for part-time (2-3 days per week)...I don't do 1 day a week and for 4 days I require full-time fees for 5 days a week. I think you need to be careful about calling it "vacation pay" as that puts you in an employer/employee relationship. I understand what you are doing, but if I were you I would change the wording or simply say that your rate is $45 and you don't charge for your daycare closures.