You should be able to claim the child as a dependent under the Qualifying Child rules if they meet all the requirements. Income for a dependent under the age of 19 or a full time student under the age of 24 is not a factor in claiming them as a dependent under the Qualifying Child rules.
You do not enter the dependent's earned income from wages reported on a W-2 or their income from self-employment on your tax return. The dependent can file their own tax return and indicate on their return that they can be claimed as a dependent on someone else's return.
To be a Qualifying Child -
1. The child must be your son, daughter, stepchild, foster child, brother, sister, half brother, half sister, stepbrother, stepsister, or a descendant of any of them.
2. The child must be (a) under age 19 at the end of the year, (b) under age 24 at the end of the year and a full-time student or (c) any age and permanently and totally disabled.
3. The child must have lived with you for more than half of the year. Temporary absences while away at college are considered living with you.
4. The child must not have provided more than half of his or her own support for the year.
5. If the child meets the rules to be a qualifying child of more than one person, you must be the person entitled to claim the child as a qualifying child.
6. The child must be a U.S. citizen or U.S., Canada or Mexico resident for some portion of the year.
7. The child must be younger than you unless disabled.
