Yes, you qualify for HOH. And your son qualifies as your dependent.
There are two types of dependents, "Qualifying Children"(QC) and Other ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit, student status, a relationship test and residence test.
A child of a taxpayer can still be a “Qualifying Child” (QC) dependent, regardless of his/her income, if:
- He is under age 19, or under 24 if a full time student* for parts of at least 5 calendar months of the year, or is totally & permanently disabled.
- He did not provide more than 1/2 his own support. Scholarships are excluded from the support calculation
- He lived with the parent (including temporary absences such as away at school) for more than half the year
*For the dependent test, the school does not have to be an eligible institution. It does need to be an eligible institution to claim the tuition credit.
From Pub 501:
School defined. A school can be an elementary school, junior or senior high school, college, university, or technical, trade, or mechanical school. However, an on-the-job training course, correspondence school, or school offering courses only through the Internet doesn't count as a school.
