I don't understand what you mean.

Your deposit should be used for the last week or two of daycare services for the child.

If you want to charge parents for personal/vacation days then you first need to change your contract and have the parent sign that updated contract.

Usually....when a provider has a vacation/sick/personal day the parent then pays the same weekly fee as usual as per the contract. ie. If a client is to pay you $160 per week then you would still get $160 that week even though you took a sick day.

I don't think you can take money from the deposit for any other purpose than what it is meant for. Maybe I am confused