child's disability doesn't affect tax filing until he turns 19 (24 if a full
time student). Then his/her disability allows him to continue to be considered a
"Qualifying Child" for tax purposes regardless of age. There are no credits
or deductions, other than that some items, e.g. special schooling, can be considered
The only place you'll be asked about her disability is when you enter her as a dependent, at personal info. You will check the disability box.