To be clear, I am not talking about "Your portion of mortgage interest" or "Outstanding mortgage principal." I understand those are to be split in half compared to what's on the 1098. What I'm not sure of is if the Original Loan Balance and Balance on Jan 1 should also be split or not. This may be important as if it's the full amount, it's over the $750,000 cap, but if half amount, it is under.