Did your son meet all of the following in 2018? I ask, because at that age if he meets all the following, then you qualify to claim him as your dependent, and his earnings just flat out do not matter.
- Was under the age of 19 on Dec 31 of the tax year and;
- Was enrolled in an accredited institution of higher learning (college, vocational school, etc.) as a full time student for any one semester that started in the tax year and:
- Was enrolled in a course of study that will lead to a degree or other credentialed certification and;
- Did not provide more than half if *his* *own* support. (scholarships, grants, 529 funds, money from parents, gifts from Aunt Mary, etc. do not count for providing his own support.)
Now I already know the answer to that last requirement is "no, he did not provide more than half of his own support"< because it's just not possible if he only earned $5200 in 2018.