Then you can still be able to claim him as a qualifying child. Go back through his information, make sure you did not say he paid for more than his own support. Also, put he lived with you all year.
If he files his own return, he must check the box Someone else can claim (his name) on their tax return, on the screen Do Any of These Apply.Qualifying Child
To claim an exemption for your child, you must be able to answer "yes" to all of the following questions.
- Are they related to you? The child can be your son, daughter, stepchild, eligible foster child, brother, sister, half brother, half sister, stepbrother, stepsister, adopted child or an offspring of any of them.
- Do they meet the age requirement? Your child must be under age 19 or, if a full-time student, under age 24. There is no age limit if your child is permanently and totally disabled.
- Do they live with you? Your child must live with you for more than half the year, but several exceptions apply.
- Do you financially support them? Your child may have a job, but that job cannot provide more than half of her support.
- Are you the only person claiming them? This requirement commonly applies to children of divorced parents. Here you must use the “tie breaker rules,” which are found in IRS Publication 501. These rules establish income, parentage and residency requirements for claiming a child
Do I need to file my own taxes if I'm a dependent?
The age is for 2 different things.
To claim a dependent they have to be under 19 or under 24 and a full time student.
To get the Child Tax Credit they have to be under 17 on December 31. See pub 972 page 3 Qualifying Child (it's for 2018)
Yes. You can claim her no matter how much she made if she is under 19 (or under 24 and a full time student). You just don't get the Child Tax Credit for her if she turned 17 in 2019.