How many months must my dependent child be a full time student to be claimed as a dependent? She lived with me the entire year

 

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At least 1 day in each of 5 different months.  So being a full time student in the spring semester only (Jan to May) or fall semester only (Sept to Dec) counts.

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Is this just for college or is high school included also.

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The 5 month rule does not apply if the child was under age 19 on 12/31/2017.