You may have to pay tax, depending on the gain. Since your father gifted you the house, your cost basis will be the same as what he paid for it originally plus the cost of any improvements made in the house over the year. You cannot take the main home sale exclusion because you did not own the house for 2 out of the last 5 years. When you enter all your information in the Sale of Home area under income, the program will figure your taxable gain.