529 plan - room and board expense for live at home student

[annoyingdad]

The maximum is the room and board allowance the school sets in the COA for the particular living arrangement of the student. Schools have different allowances in the COA for living on campus, living off campus and living at home with parents. So it would be the latter limit. You may have to contact the school to find out what that allowance is.

The allowance for room and board, as determined
by the eligible educational institution, that was included
in the cost of attendance (for federal financial
aid purposes) for a particular academic period
and living arrangement of the student.

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http://www.irs.gov/pub/irs-pdf/p970.pdf