I think its close to 25-35% depending on how long your kids are here, how many kids you have...I think also I have charged $8-10/child in the past. I can't recall the exact amount, that is up to my accountant to figure it out ....I keep all my receipts, and don't buy separately....that would be more chaotic for me - i would rather keep it all together and then add it up and submit the final total figure to the accountant to take a percentage out of it. Hope that helps!