Deductions & credits

Hello,

 

I’ve read through these responses and haven’t gotten a fully clear answer. My fiancé and I are figuring out taxes. We each own the house and it’s split between us. We have a joint account where all of our money goes and the credit cards we pay things for are under my name so it’s like I pay the expenses while she pays the mortgage. All expenses and mortgage payments come out of the same account which is shared. She makes more than I do. Is it possible for her to claim the entirety of the mortgage interest and taxes, while I just do the standard deduction? Or do we each have to claim a portion of it? 

IF we each have to claim a portion, can it be where she claims a larger portion of it due to our salary differences so we can see a larger deduction for her? 

We are not married so it seems we might be able to have her have the deductible but I’m not sure. 

Thank you.