To figure if you provided more than half of a person's support, you must first determine the total support provided for that person. Total support includes amounts spent to provide food, lodging, clothing, education, medical and dental care, recreation, transportation, and similar necessities.
Generally, the amount of an item of support is the amount of the expense incurred in providing that item. For lodging, the amount of support is the fair rental value of the lodging.
Expenses not directly related to any one member of a household, such as the cost of food for the household, must be divided among the members of the household.
Fair rental value defined.
Fair rental value is the amount you could reasonably expect to receive from a stranger for the same kind of lodging. It is used instead of actual expenses such as taxes, interest, depreciation, paint, insurance, utilities, and the cost of furniture and appliances. In some cases, fair rental value may be equal to the rent paid.
If you provide the total lodging, the amount of support you provide is the fair rental value of the room the person uses, or a share of the fair rental value of the entire dwelling if the person has use of your entire home. If you don't provide the total lodging, the total fair rental value must be divided depending on how much of the total lodging you provide. If you provide only a part and the person supplies the rest, the fair rental value must be divided between both of you according to the amount each provides.
Here is an IRS resource with examples for calculating the fair rental value.
https://www.irs.gov/publications/p501#en_US_2020_publink1000220972
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