That is exactly why if you entered Mortgage interest from the year end statement you received from your Mortgage co, it will not be included in your return IS IF YOUR STANDARD DEDUCTION IS GREATER THEN YOUR TOTAL ITEMIZED DEDUCTIONS which includes Mortgage interest along with medical etc you report as part of Schedule C " Itemized Deductions". This does not produce an error or should not, but if you are trying to manually go into the worksheets and enter the mortgage interest, you certainly will because you can't take both standard deductions and itemized deductions.
