It depends, but probably. The main question is whether or not he is considered disabled by tax standards. Here is an IRS link regarding who is a Qualifying Child. Most children (and adults) with autism do qualify under the definition, since it is likely that they will be unable to truly care for themselves.
It is a good thing that your son is able to work, but if he is not caring for at least 50% of his own financial support (which is unlikely), and he is living with you for at least 6 months, then he is your Qualifying Child (especially if your doctor provides proper documentation to back up your claim). He would also qualify as a dependent for Earned Income Credit (if you would qualfiy for that credit), as well as the Child and Dependent Care Credit (if you must pay for a daycare or similar service to care for him).
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