If you pay OOP yes Tax and Tip is included. Also if you pay OOP, you will have to give your credit card number, and your card will be charged for the full price as soon as your make your ADR. For DH and I, we booked dinner and it was $99.84.
Yes, the tax and gratuity are already included. The price also includes a photo package with Cinderella and a magic wand for the little princessess and a sword for the little princes.