Each borrower would complete the section for their 1/2 share or whatever ratio that you paid. Select the radio button ' I co-own this loan with someone'. Then continue to enter your share of the interest.
The same concept would apply for the property taxes as well. You each deduct what you pay.
https://budgeting.thenest.com/can-coborrower-claim-mortgage-interest-paid-taxes-29665.html
[edited 1/15/18 5:14pm]
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