Does a full-time student also count for high school?

[stetsonblake35]

I turned 18 on June 29 2025, but still went to high school last year from January to May. Would that be eligible to being a full-time student for at least five months during 2025?

[Hal_Al]

Q. I still went to high school last year from January to May. Would that be eligible to being a full-time student for at least five months during 2025?

A. Yes. But, it's academic since you were under 19 at the end on 2025. 

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:

1. He is under age 19, or under 24 if a full time student for at least 5 months of the year, or is totally & permanently disabled
2. He did not provide more than 1/2 his own support. Scholarships are excluded from the support calculation
3. He lived with the parent (including temporary absences such as away at school) for more than half the year

[xmasbaby0]

The questions about being a full-time student pertain to college, because there are education credits that parents or students may be eligible to receive.   There is nothing to be gained by saying you were a full-time high school student.