On average, the cost for children with autism and an intellectual disability in the U.S. was more than $107,800 per year up to age 5, and roughly $85,600 per year between ages 6 and 17.mong children with no diagnosed intellectual disabilities, the associated costs were lower: approximately $63,290 per year for those 5 and under, and $52,205 per year for those between 6 and 17.