From the IRS
https://www.irs.gov/publications/p526#en_US_2012_publink1000229664
Expenses Paid for Student Living With You
You may be able to deduct some expenses of having a student live with you. You can deduct qualifying expenses for a foreign or American student who:
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Lives in your home under a written agreement between you and a qualified organization (defined later) as part of a program of the organization to provide educational opportunities for the student,
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Isn't your relative (defined later) or dependent (also defined later), and
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Is a full-time student in the twelfth or any lower grade at a school in the United States.
You can deduct up to $50 a month for each full calendar month the student lives with you. Any month when conditions (1) through (3) are met for 15 or more days counts as a full month.
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