Yes, you may be able to claim your son as a qualifying child if:
- He is under 19, or a full-time student and under 24 years of age. There is no age limit if he is permanently and totally disabled.
- He lives with you for more than half of the year (Temporary absences, like going to college does not count)
- You provided more than half of his support for the tax year
- You are the only person claiming him
See the article below for the rules about claiming a qualifying child.
Here is a worksheet that will help you determine if you provide more than half of your son's support:
If your son claimed himself, then he will need to file an amended return. When amending, the box Someone can claim me as a dependent will need to be clicked so that you can claim the exemption. To file an amended tax return, follow the steps below: