Renting below fair market value
You can deduct your expenses only if you incur them to earn an income. In certain cases, you may ask your son or daughter, or anyone else living with you, to pay a small amount for the upkeep of your house or to cover the cost of groceries. You do not report this amount in your income, and you cannot claim rental expenses. This is a cost-sharing arrangement, so you cannot claim a rental loss.
If you lose money because you rent a property to a person you know for less money than you would to a person you do not know, you cannot claim a rental loss. When your rental expenses are consistently more than your rental income, you may not be allowed to claim a rental loss because your rental operation is not considered to be a source of income. You can claim a rental loss if you are renting the property to a relative for the same rate as you would charge other tenants and you expect to make a profit.