Based on the comment that you posted, the $45,000 is a gift from your father. A gift is not taxable income to you, and you do not report it on your tax return. Your father has to file a gift tax return to report the gift. He will not have to pay any gift tax unless the total of all gifts he has given in his lifetime is more than $11,180,000, but he has to file the return.
Post more details if it is not an outright gift, or if there are strings attached to the gift, or if your father expects you to repay it, or if your father will be a part owner of the house.
