ASD=Autism spectrum disorder?
Because the IRS (tax) definition of disability is based on a person's ability to perform gainful employment, many people with medical definitions of disability are not actually disabled for tax purposes. The IRS says that if someone can work at least a minimum wage job without substantial special accommodations, that is proof they can do gainful work.
Even if your child meets this definition of disabled, the only tax benefit for listing a child as disabled is that you could get the dependent care credit if you have to pay for day care after they turn 13, because they can't care for themselves.
There would be no penalty for not listing your child as disabled (if they are), and no need to amend your prior returns.
This answer has been verified for accuracy by an Intuit expert employee
