I serve all organic so my costs are hight. BUT, when I was serving non-organic ( a number of years ago now) it was less. My estimate is that it costs about $10 per day, per child in expenses. BUT, you can write off A LOT because you are operating out of your home so you can write off mortgage interest, house insurance, utilities for every single square foot of your home you use for daycare hours. So, if you operate nine hours a day, five days a week, that means 45 hours of EVERY week you can write off every single foot of space you use for daycare. That's just over 25% of you entire costs of living in your home that you would have to pay for anyway.
Honestly, in all my years of providing daycare I have never paid more than just my CPP. Hire a GOOD accountant, save EVERY receipt, be really good at knowing what you CAN and can not claim as an expense. Build out a special space for your daycare and write that off over the years,