You really need to already have this established in your parent handbook, as most of the posters have stated. Are you newer to home daycare as a provider? I charge for enrollment, not attendance.
I personally do not get paid for my own vacation/illness days..but I do get paid for holidays. Parents pay no matter what for days they voluntarily do not bring their child. Always.I am still open and providing my services, it is their option to not come on those days.
Look at this way...if they go on vacation or just decide they won't use their cable TV for a week, do you think they get the option to NOT pay the bill for the week? No, they still have to pay for the service to be in place. Its their choice to not use it that time frame. Same deal.
But you need to have all of this in writing and both parties need to know about it...put it on the calendar, remind parents in case there is confusion. Stand firm, etc.
Best wishes!