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Your son doesn't qualify for the dependency exemption because of his age and income. To claim your son as a dependent, he must be either your qualifying child or your qualifying relative.  Even though your son was a full-time student, he wasn't under age 24 for the duration of 2017 so he isn't considered a qualifying child. He also isn't a qualifying relative because his income exceeds $4,050. For a complete list of requirements for a qualifying child or a qualifying relative, please see this FAQ: Who can I claim as my dependent?