We can claim all our child's tuition as a medical expense, but come tax time, only a paltry 15% actually gets deducted. On paper we're classified as high income, so no government help, but frankly most of what we make is going to our child, so we need a break. Is 15% the best we can expect?
The Financial Post wrote a good article on this last year that addresses that question: http://business.financialpost.com/2014/03/29/when-private-school-is-a-valid-expense-for-tax-purposes/
The disability tax benefit in particular does depend on income but it is a good idea to speak with a financial advisor to see if they have any additional suggestions.
We have some additional information on tax deductions that may be helpful here: http://www.ourkids.net/private-school-tax-deductions.php
We also have some information on scholarships: http://www.ourkids.net/private-school-scholarships.php and other ways to pay for private school that may be options: http://www.ourkids.net/school/pay-for-private-school-18-tips.php