You can do it but it is not easy. You would have to create new user names for each of you and fill out fake returns with only one individual's information on each. Afterwards, you can abandon the returns. Keep in mind that if one of you itemizes, the other loses the standard deduction and would have to itemize as well. Also you can;t double dip on the mortgage and property taxes. You could pro-rate them however you wish up to 100%.